Document EqYDkDjM3vkR60nN6L7y0dKd4
13694 Federal Register / Vol- 5S. No. 70 / Wednesday, April 11. 1990 / Rules and Regulations
DEPARTMENT OF LABOR
Oeeupattonel Safety and Health Administration
39 CFR Part 1910 -
Safety and Health Standards: Welding, Cutting and Brazing
agency: Occupational Safety and Health Administration (OSHA), U.S. Department of Labor. action: Final rule; Redesignation and other nonsubstantive revisions.
summary: The Occupational Safety and Health Administration (OSHA) is reorganizing its existing pan 1910 Standards pertaining to Welding, Cutting and Brazing aa a first step in an effort to revise these standards comprehensively. The existing standard is long and not well organized, with paragraphs covering spemfie operations, such as arc weiding, appearing ahead of more useful general provisions, such as for fire protection. This reorganization will facilitate the standard's use by employers and other users, and will also facilitate the substantive revision of the standards planned for the future. Also included in this reorganization action are some minor non-substantive changes, such as the addition of metric equivalent unit*.
effective OATc This action will be effective on May 11.1990.
FOR FURTHER INFORMATION CONTACT;
Mr. fames F. Foster. Office of Information and Consumer Affairs, Occupational Safety and Health Administration. U.S. Department of Labor. Room N34B7.200 Constitution Ave. NW,, Washington. DC 20210, (202) 529-4151. This reorganization document was prepared by Wendell Glesier, Directorate of Safety Standards Programs.
SUPPLEMENTARY INFORMATION:
I. Background
The existing OSHA standard covering safety in Welding. Cutting and Brazing (29 CFR 1910.252) was promulgated in 1971. under the authority of section e(a) of the Occupational Safety and Health A.ct of 1970. Except for minor deletions, no changes have been made to the standard since that time. Changes in welding technology, weiding practices and in the National Consensus Standards on which the rule was based have all occurred since 1971. The OSHA welding standard requires updating to reflect current technology and practices In the industry, and to provide consistency with currant industry standards.
- OSHA's attempts to prepare a
notice and an opportunity for comment
proposed revision to the currant welding! Is not required.
standard have been hindered by the standard's great length and ineffective
IIL Other Changes
organization. Because of the atandard'i
In addition to the reorganization and
length and complexity, it is difficult to
renumbering, certain other minor, non
read and to locate specific requirements. substantive changes are included in this
Employers and other users have
action. These are: (1) the addition of
complained that the length and
equivalent metric units where venous
complexity make it difficult to
measurements were formerly given only
understand, and comply with, the
in non-metric units: (2) changes to reflect
standard's provisions. The current
the transfer of functions among Federal
standard's organization, with
agencies; (3) the deletion of six formerly
paragraphs dealing with specific
"reserved'* provisions: (4) the deletion of
processes, such as oxy-fuel and arc
one non-substantive provision adopted
welding, located ahead of more general in error; (5) the correction of one
provisions, such as those for ventilation provision's erroneous internal reference;
end fire protection, presents a problem and (6) the updating of the mailing
that needs to be corrected. Instead of
addresses of the organizations that
trying to solve the problems of length,
published the source standards.
complexity and poor organization
One error in the welding standards
concurrently with a substantive revision that was previously identified by OSHA
of the standard's provisions. OSHA has derided to proceed in two phases. This action will address the problems of organization and complexity, while
will not be corrected in this documenL On November 3a 1987. as part of the Electrical Safety-Related Work Practices notice of proposed rulemaking, existing
future rulemaking will address the
i I910232(a)(6)(iv)(d)(2). was listed as
substantive revision of the standard's provisions.
one of several OSHA general industry standards that contain inaccurate
1L Benefits of Reorganization
references to OSHA's electrical . standards (52 FR 45530.45541). OSHA
OSHA believes that the
proposed at that time to correct the
reorganization will be very benefidaL
reference (Id. at 45545). Although this
Most importantly, the creation of a more weiding provision will be redesignated
logical format and the renumbering of
as { 1910253(0(4)(iv)(B). as e result of
the standard will make it easier for both the reorganization announced in today's
the public and OSHA to use. TTie
Federal Register publication any
provisions having a more general
amendments to the provision's reference
application will now be located at the
to the electrical standards will be made
beginning of the standard where thay
as a result of the electrical safety
can be more easily located. Also,
rulemaking.
because the current f 1910.252 will be converted into four sections (1910252-
1. Addition ofMetric Units
1910.255), all Its provisions will become much more accessible. In addition, the
The existing welding, cutting end brazing standard contains many
standards will follow the Office of the
measurements, such ss those for weight
Federal Register's guidelines for proper length, volume, pressure and
paragraph numbering and cross-
temperature. No metric equivalents were
referencing. OSHA also anticipates that provided for sny of these measurements.
this action will facilitate the Agency's
Since the policy of the Federal
planned substantive revision of the
Government la now to provide metric
welding standard by eliminating the
units whenever feasible, equivalent
problems of reorganization and
metric units have been added to each of
renumbering, which otherwise would
- these measurements.
have to be addressed in that rulemaking.
The phase two proposed revision will be accomplished through rulemaking .
& Change to Reflect Transfer of Authority Between Federal Agencies
procedures which will provide appropriate public notice end
The existing welding standard contains several references in
opportunity for commenL
{ 1910252(0 to the U. Bureau of Mines
OSHA wishes to emphasize that this ss the approving authority for
action does not alter the substance of
respiratory protective equipment. The
the present welding, cutting snd brazing standards in any way, nor does It affect their present scope and application. Because there ere no substantive amendments to OSHA's standards in
this action, providing the public prior
current authority lor the approval of such devices lies with the Mine Safety and Health Administration (MSHA) of the U.S. Department of Labor, and with the National Institute for Occupational
Safety end Health (NIOSH) (See 30 CFR
A 0444^q CONFIDENTIAL
Federal Register / Vol. 55. No. 70 / Wednesday. April 11. 1990 / Rules and Regulations 13895
part III. Consequently, references pertaining to the approval of respiratory protection devices have been changed to reflect the transfer of authority.
3. Deletion of Reserved Sections
The existing OSHA welding standard contains six provisions which are presently "reserved." The regulatory text was removed by OSHA. either by the 1978 "Revocation of Selected General and Special Industry Safety and Health Standards" (43 FR 49726) or by the 1984 "Revocation of Advisory and Repetitive Standards" (49 FR S31B). Since these "reserved" provisions contain no regulatory text, they serve no useful purpose and are therefore deleted. Provisions following the formerly "reserved" provisions have been redesignated to maintain the correct numerical or alphabetical sequence. The "reserved" provision* which are being removed are listed below:
i9t0.23Z(aH31(vKe)
1910-25(s)(5Kv)(6) 1910.23211 )(7](Ui](d)
1910^32(0(31
1910-252(e|(2)((t)(/) 192&2S2(fHlJ[ii)
4. Deletion ofNon-Substantive Provision
Paragraph (a)(3)(v)(h) of existing 51910.252 contains no substantive requirements other than requiring compliance with "subdivision (f)" of S 19l0.252(a)(3)[v). However, there is no subdivision (i). Since this provision neither contains nor references substantive requirements, it is being deleted. The provisions which follow the deleted provision have been redesignated to maintain the correct numerical sequence.
5. Correction of Internal Reference
Paragraph (a)(2)(vi)(o)(3) of existing 1 1910.252 contains a reference to "paragraph (a)(8) of this section." There is no paragraph (a)(8). OSHA has concluded, through reference to ANSI Z49.1-1967. that the correct reference should be to paragraph (al(6Kvi)(a)(g). This action corrects the erroneous reference, which, after reorganization, appears s paragraph (0(6)(i}(H) of $ 1910.253 (see conversion table).
6. Updating of Addresses of Source Standards Organizations..
The standards organizations listed in existing } 1910.254 contained, except for (he American National Standards Institute, outdated addresses. The addresses have been updated in redesignated ) 1910.257.
For convenience of reference, OSHA has prepared the following conversion table which lists ell the "old" provisions in subpart Q and. alongside each, the equivalent "new" provision.
Welding, Cuttteg end Brazing Conversion Tablo--Part U10. Subput Q
Old Pramiottt | 1910231 ...
New Proritiont 11910231
Definitions
Definition* (Nocbana**)
Old Premia*
New Proritiont
I unnw - - - 1 lmUSS
Welding, salting, nod Ozygeo-fuei got welding
brazing
and cutting
(imtIMWI------------------ (aK-(4t
(.IClItKoMol--------------- (bltUUMiv) (a|(2i(ii1taH</)-------------- lbH2)UH**i
(alUKUil------------------ (bits)
(al(2|(Ui)(irH8)--------------IbMSMtHin
(alimirltaHd)--------------- (bittMIHtv)
(a l(2)(vital----------------- (bHSHi)
(.|(2||vM0HJHJri----------(bMSUUgAHQI
(alUlWMbltrsHiHii)----- (h|tS|[iWR)UM2)
tH2!tve)UH)------------IbHSHUlHAWt)
(HJI(iHflHl----------------- (ddltO-M UXSMUKaH/l---------------- tcK2i(IHvi| (eKSHUilteH*)--------------- (c|(3|(iHv|
UltJMivltaMM--------------- (c|(4|dHvl>
(K3KIIHM---------------- (cKSKiHvi)*" (4l(4|(i|(aK/|------------------ [dMtIOMAl
tH4|tt)toKiKiH<fl---------- tdltlXlHAXJHri <a|<4ldl(oK2)------------------ (dXDHUB)
{4K4MIKWHJ)----------- (dMt)tUMAHQ
(eldltOWdHri-------------- (dl(U(im(AMD| (4)t4)lMoHe)---------------- (diUl(IHlU)
(HohiumoM/)---------------- (dl(3MH*) |44mvaHe)--------------- tdH4HIHlU1
t*tt4ltvoHb)---------------- WHSHiHOI [allSIdHM-------------------- (eMlH2l ((IISItiUUaHb)--------------- (e21(lHin
(altSItmilfiHJHS)--------- (alPMHHAHQ
(ItSIliiiKSKSItiH'vt-------- (*K3il)iatH4) (HS|(ili)(cHO) -- . (allSIliiiHiv) (l(ldvaH/>)--------------- (H4l(>Hi) (MSMvMoHO-----------------(eKSIOHv)*
UKSHviMeHd)(cHSHIHW)
UiieidlloM/O----------------(OdtOHUI (.HelluMoHcl--------------- (0(2Kit-(u>) (sHSI(tii)---------------------- (0(31
UHeKivltoKrHS)------------I0(4J0)fAME) ( HSI0*HS)dH3)------------fOdNUXAHCl UHSIdvMaXrHSt------------ (OUKUiHAHF) (tliaXWMdKiHri----------- dldXivitAHE) ll(l(v)toltlH4l------------- (OtsmUAHDI ll(altv|t*MlHJ)------------ imsitiiHAHE) t*|(el(viXaM>Het-----------(OtettiKAHlI (liailviHOHel-------------- (OUXiiHUil
(KsuviHdKrH2)------------(OtaitivHAWB)
(i|(SI(viH*|--------------- tntSHv)
<*l(ai(vtiXal------------------ (OPlti) (aKSNvnMolUMV)----------- (OdldMAWDI
(lieilvuMOHOIM710D-M (imdUaMd)-------------- - (HlHiH>vl (*imitDial------------------- (*1(2X0 (l|7|tiillKJHZ)________ (IK2I0XAHB)
(aUniuKAI.------------------ 1*1(2100
(l(7)l6ttHJ|------------ (flUMUKAHO (alintUMel.------------------- (sK2l(iii)
UM7|(iKMl--------------(DtSKtHivI*
OldPtomion* '
Ntw Proritiont
Iw
11910234
Welding, cutting, end Ait welding and cutting dieting
(bltiitiHiill------- -- -- WUH3)
(bK2im----------------------- . (bill) (b)|2l|li|(oNb|----------- --. lbl<210Mii)
(b)t2)tmiti)UH)---------- -. IblUUUUAHH) (b)(2l(ii.|----------------------. lbl|3) (blUlliiillal.---------------- -. (bil3Hi)
|b)(JI(iiillcl(IH21----------. (bl|31d1(AHB) (b|(2ltiiil|b)------------------ . (bl|3llii| (bimtiiiltbKJHi)----------. (bl(3t(ii|(AHB) (b)(2|(iiil(eHbl------------- . (bl(3l(tiiHiv) tbXHtWnoHfl-------------- , (b|4l|IHvi> (blOldl----------------------- . (eld) (bKSKuHaH*)-------------- , lel(Z)dHv) (bl(3|(iiil(aHd)------------ . |cl|3)dHiv|
(bl(3iii)|d)lJW2)--------- . (el|3l(ivHAHB) |b)t4|(iH)--------------- . (dlllHSI
(b)(4]u*)loMe)------------- . (d9iHui)
Old Proritiont
New Proritiont
I1910T4T
- . 11910233
Welding, cutting, and brazing
Rtsutaneo welding
(c)tlHIWlv)------------------ (a)(lH4|
(cMIHIHiz)-----------------. (bldH#)
teHSKiHvi)-----------------_ (eldHM te|(4HiWii)------------------_ (d)dH2) (cKSHS)--------------------- -(a)*
Old Provision*
New Proritiont
i 1910232-------------------. 11910232 Welding cutting and Genera/ rwqmrementt beating
(d)(1)------------------------- - (aid) IdMDUHiil)---------------- _ (aXl)dHUI)
(d)(2)------------------------- - (aHZI
(dUZIUHii)----------------- - (ildXlWUI (dH2)(UH(ol----------------- - (4H2KWHA1
(dKZKimiaKlHO---------_ (a|(2KUIl(AXrH4)
(d\(Zl(uO|b)----------------- - (aKZKUiXSI
(d)(2|(lvHvi)---------------- (aM2)(lvWw) (d2vt|(oHe)------------ - (1M2MV1XAHD)
(dUZMvilHiuii)------------ _ |a)|2){vUHU) (d)(2)(xiii1(oH<0----------... (a)|2|(iiHAHO) (d|(2)(uv|------------------ - (a)(2)(xW)
(d)|2)ixivJ|oH)---------- _ (a|(2|(uvHAHC) (dl(21(uvl(cl(IHS)------- _ (aH2|(zivHCUlH3)
(dl(2)(*lvn<rt-(s)---------- _ (.|(2l(nv|(DNC| |d|(lxv|--------------------- (a|(2ltzvt
(dldllO-OO------------------ (a|(3K<Mii) (d)(4HiHUI------------------ (M4ldH`i) (t|(ll(IHii|------------------ IbldH.Nii) (l(lil|oHd)------------- - (b||2)|iJ(AHD|
WCIIIMaMO:------------ - (bllZIdiMAHO* f*H2)(iiil-------------------- - (bl(ZidU)
(IdMO----------------------- (bK3| HO dtUltrd. . beciuM bo (ii)|
(l(4ldHvd|
- (b|(4|dMviO
WdXO--------------- :------ - (el(ltd) (OdldKoMel-------------- _ (eldldWAMa
(OdldO-M-----------------_ |e|dld.Hiv|*
(OdX*KMel------------- - IcIdldvXAHQ (0(2|(i)---------------------- - (clUt(i)
inilldlloHe)--------------- (eH2)dl(AHa (D(2)(ii)----------------------- (eM2)(U)
[0131
- 1*1(3)
(0(31(0-00
- (cldldMii)
(0(4)(lHv)----------------- - (e|(4|dHv|
(OlSHiWiil----------------- - {ellJIdNill
(OdWO-dO----------------- - iellBKIMn)
(OmoHiii)------------------ lc||7ldM>> (0(41------------------------- _ (clie)
I0I9MD-00---------------- |e)tIOH`0 lOdoi---------------------- .- (cidoi (OdUOH'O----------------- UIdlldMIO (0112H13I----------------- - le|ll2H13|
IgldldHvil)--------------- (didi(iwi0
(11(2X0-00---------------- - (dldlOHH)
Old Proritiont
New proritiont
1191(17M - - _ 11910230
Sources of standards
Soureot of itondatdt
Old Proritiont
St* Prvrt$ion*
11910-234 ___
_ | 1910237
00 coNf
13SSS
Federal Register / Vol. S3, No. 70 / Wednesday, April ll. 1900 / Rules and Regulations
Standard* aryamtnttong Standard* arfotutatian*
Ml -------------------------Ml
(M
('1
. Ml
m -------------------------in
* Pnvisieni currently Htltd * "Rwcfvni" In 29
CFTl ptrt 1910. >u&prt Q, ar* beinj ** Exutint pirunoa (l(3|(vlUM t bein
ceJ;td btcauta it contain* no lubatnntiv* rvquira-
tmxitsituts and Rim to a provision mtitcA does not
IV. Regulatory Impact Assessment
OSHA find* that this action consists solely of the reorganization and renumbering of existing standards and other minor changes which do not alter or add to the requirements presently applicable to welding, cutting and brazing operations. As already noted, the action will make the welding standards easier to use by the public and OSHA, and will facilitate the planned revision of these standards by OSHA. There will be, however, no increase in cost or burden to employers, since the present substantive requirements are not being altered.. . OSHA therefore finds that this is not a major rule which require* preparation of a regulatory impact analysis pursuant to Executive Order No. 12231. For the same reason, OSHA further certifies that this action wifi not bsve significant economic impact on a substantial number of small entities and, therefore, there is no need to prepare > regulatory flexibility analysis pursuant to the Regulatory Flexibility Act (5 U.S.C. 601 et seq.). OSHA will, of course, perform these analyses as appropriate In conjunction with any ensuing project to revise the welding standards.
V. Exemption from Nodes and Comment Procedure*
With regard to this action. OSHA baa determined that it la not required to follow procedures for public notice and comment rulemaking under either section 4 of the Administrative Procedure Act (5 U.S.C. 553) or under section 6(b) of the Occupational Safety nd Health Act (23 U-S.C. 655(b)). This action involves a reorganization of existing standards and other minor changes which do not affect the substantive requirement* or coverage of the standards themselves. This action does not modify or revoke existing rights or obligations, nor does it establish new ones. OSHA. therefore, finds that notice and public procedure are impracticable and unnecessary within the meaning of 5 U.S.C. 553(b)(3)(B). For the same reasona.
OSHA also finds that in accordance with 29 CFR 1311,5. good cause exists for dispensing wuh the public notice and comment procedures prescribed in section 6(b) of the Occupational Safety and Health Act.
VI, list of Subjects
List of Subjects in 23 CFR Part 1910
Asbestos. Chemicals. Diving, Electric power. Electronic products. Fire prevention. Cases, Hazardous substances. Health records. Incorporation by reference. Labeling, Laboratories. Noise controL Occupational safety and health. Radiation protection. Reporting and recordkeeping requirements. Signs and symbols.
VIL Authority
This document was prepared under the direction of Cerard F. ScanneU. Assistant Seaettry of Labor for Occupational Safety and Health. UJ5. Department of Labor. 200 Constitution Avenue NW-. Washington. DC 20210.
Accordingly, pursuant to sections 4.6. and 6 of the Occupational Safety and Health Act of 1970 (23 U.S.C. 653. 655. 657), 5 U.S.C. 553. Secretary of Labor's Order No. 1-90 (55 FR 3033), and 23 CFR part 1311, subpart Q of part 1310 of 29 CFR is revised to read as set forth below.
Signed at Washington. DC this 30th day of March, mo. Genud F.ScaosaU,
AssistantSecretory ofLabor.
PART 1910--OCCUPATIONAL SAFETY AND HEALTH STANDARDS
The authority dtation for tubpart Q of part 1310 is revised to read:
Authority: Sec*, 4. a. 8. Occupational Salary and Health Act o( 1370 (20 U-S.G. 63X 635, 657): Secretary of Libor * Order No. U-71 (30 FR 875416-78 (41 FR 230391.0-83 (48 FR 357301. or 1-30 (55 FR 3033). 41 applicable: 5 U.S.C. 553:29 CFR put 1011.
2. Part 1310 (s amended by reviling subpart Q to read aa followa:
Subpart O--Welding. Cutting and Brazing
See. 1910251 Definitions.
1910252 Central requirements. 1910233 Oxygen-fuel gas welding and
cutting. 1910254 Are welding and cutting. 1910255 Resistance welding. 1910250 Sources of itandsrda. 1910257 Standards organizations.
Subpart fr--Weldlng, Cutting and Braztitg-' *
1910251 Definitions. As used In this
tubparC
(a) Welder and welding operator mean any operator of electnc or gas welding and cutting equipment.
(b) Approved means listed or approved by a nationally recognized testing laboratory. Refer to S 1310.155(c)(3) for definitions of listed and approved, and 11310.7 for nationally recognized testing laboratory.
(c) Ail other welding terms are used in accordance with American Welding Society--Term* and Definitions--AXO--
969.
S 1910252 General raqtdramene*.
(e) Fire prevention and protection-- (1) Basic precautions. For elaboration of these basic precautions and of the special precautions of paragraph (a)(2) of this section as well as a delineation of the fire protection end prevention responsibilities of welders and cutter*, their supervisors (including outside contractors) and those in management on whose property cutting and welding is to be performed see Standard for Fire Prevention in Use of Cutting and Welding Processes, NFPA Standard SIB. 1362. The basic precautions for fire prevention in welding or cutting work ere:
(!) FtnhexanJs. If the object.to be welded or cut cannot readily be moved' all movable fire hazards is the vicinity shall be taken to a safe place.
(il) Guards. If the obfect to be welded or cut cannot be moved and if all the fire hazards cannot be removed then guard* hall be used to confine the heat, sparks, and slag, and to protect the immovable fire hazards.
(iii) Restrictions. If the requirements stated in paragraphs (*)(1)(ij and (*)(l)(ii) of this section cannot be followed then welding and cutting shell not be performed
(2) Special precautions. When the nature of the work to be performed falls within the scope of paragraph (a)(l)(ii) of this section certain additional precautions may be necessary:
(i) Combustible material. Wherever there are floor openings or cracks in the flooring that cannot be closed precautions shall be taken so that no readily combustible matenaia on the floor below will be exposed to sparks which might drop through the floor. The same precautions shall be observed w.th regard to cracks or holes in walls, open doorways and open or broken windows.
(ii) Fire extinquisbers. Suitable fire extinguishing equipment shall be
DO A 044461 CONFIDENTIAL
Federal Register / Vol. 55. No. 70 / Wednesday, April 11. 1990 / Rules and Regulations 13697
maintained in a state of readiness for
gases, vapors, liquids, or dusts with air),
(D) Advise all contractors about
instant use. Such equipment may consist or explosive atmospheres that may
flammable materials or hazardous
of pails of water, buckets of sand, hose develop inside uncleaned or improperly conditions of which they may not be
or portable extinguishers depending
prepared tanks or equipment which
aware.
upon the nature and quantity of the
have previously contained such
(xiv) Supervisor. The Supervisor
combustible material exposed.
materials, or that may develop in areas
(A) Shall be responsible for the safe
(iii) Fire watch. (A) Fire watchers
with an accumulation of combustible
handling of the cutting or welding
shall be required whenever welding or dusts.
equipment and the safe use of the
cutting is performed in locations where
(D) In areas near the storage of large cutting or welding process.
other than a minor fire might develop, or quantities of exposed, readily ignitible
(B) Shall determine the combustible
any of the following conditions exisu
materials such as bulk sulfur, baled
materials and hazardous areas present
U) Appreciable combustible material, in building construction or contents, closer than 35 feet (107 m) to the point of operation.
[2) Appreciable combustibles are more than 35 feet (107 m) away but are easily ignited by sparks.
(J) Wall or floor openings within a 35foot (107 ml radius expose combustible material in adjacent areas including
concealed spaces in walls or floors. (4) Combustible materials are
adjacent to the opposite side of metal partitions, walls, ceilings, or roofs and
are likely to he ignited by conduction or radiation.
(B) Fire watchers shall have fire extinguishing equipment readily
available and be trained in its use. They shall be familiar with facilities for
sounding an alarm in the event of a fire. They shall watch for fires in all exposed areas, try to extinguish them only when
obviously within the capacity of the equipment available. or otherwise sound the alarm. A fire watch shall be
maintained for at least a half hour after completion of welding or cutting operations to detect and extinguish possible smoldering fires.
(iv) Authorization. Before cutting or welding is permitted, the erea shell be inspected by the individual responsible for authorizing cutting end welding operations. He shall designate precautions to be followed in granting authorization to proceed preferably in the form of a written permit.
(v) Floors. Where combustible
paper, or cotton.
(vii) Relocation of combustibles.
Where practicable, all combustibles shall be relocated at least 35 feet (107 m) from the work site. Where relocation is impracticable, combustibles shall be protected with flameproofed covert or otherwise shielded with metal or asbestos guards or curtains.
(viii) Ducts. Duets and conveyor systems that might carry sparks to distant combusubles shall be suitably
protected or shut down. (ix) Combustible walls. Where cutting
or welding is done near walls, partitions, ceiling or roof of combustible construction, fire-resistant shields or guards shall be provided to prevent ignition.
(x) Noncombustible walls. If welding
la to be done on a metal wall, partition, ceiling or root precautions shall be
taken to prevent ignition of combustibles on the other side, due to conduction or radiation, preferably by
relocating combustibles. Where combustibles are not relocated, a fire watch on the opposite side bom the work shall be provided.
(xil Combustible cover. Welding shall not be attempted on a metal partition, wall, ceiling or roof having e combustible covering nor on walls or partitions of combustible sandwich-type panel construction.
(xii) Pipes. Cutting or welding on pipes or other metal in contact with combustible walls, partitions, ceilings or
or likely to be present in the work
location.
(Q Shall protect combustibles from
ignition by the following:
(i) Have the work moved to e location
free from dangerous combustibles.
(7) If the work cannot be moved, have
the combustibles moved to e safe
distance from the work or have the
combustibles properly shielded against
ignition.
(3) See that cutting and welding are so
scheduled that plant operations that
might expose combustibles to ignition
are not started during cutting or
welding.
(D) Shell secure authorization for the
cutting or welding operations from the
designated management representative.
(E) Shall determine that the cutter or
welder secures his approval that
condition! are safe before going ahead.
(F) Shall determine that lire protection
and extinguishing equipment are f
properly located at the site.
V
(G) Where fire watches are required^
he shall tee that they are available at
the site.
(xv) Fire prevention precautions.
Cutting or welding shall be permitted
only in areas that are or have been
made fire safe. When work cannot be
moved practically, as in most
construction work, the area shall be
made safe by removing combusubles or
protecting combustibles from ignition
sources.
-(3) Welding or cutting containers--(i).
materials such as paper clippings, wood roofs shall not be undertaken if the work Used containers. No welding,' cutting, or
shavings, or textile fibers are on the
is close enough to cause ignition by
other hot work shall be performed on
floor, the floor shall be swept clean for a conduction.
used drums, barrels, tanks or other
radius of 35 feet (107 m). Combustible
(xiii) Management Management shell containers until they have been cleaned
floors shall be kept wet. covered with
recognize its responsibility for the safe so thoroughly as to maka absolutely
damp sand, or protected by fire-resistant usage of cutting end welding equipment certain that there are no flammable
shields. Where floors have been wet
on its property end:
materials present or any subetances
down, personnel operating arc welding
(A) Based on lire potentials of plant
such as grasses, tars, acids, or other
or cutting equipment shell be protected facilities, establish areaa for cutting and materials which when subjected to heat,
from possible shock.
welding, and establish procedures for
might produce flammable or toxic
(vi) Prohibited areas. Cutting or
cutting snd welding, in other areas.
vapors. Any pipe lines or connections to
welding shall not be permitted in the
(B) Designate an individual
the drum or vessel shall be disconnected
following situations:
responsible for authorizing cutting and or blanked.
(A) In areas not authorized by
welding operations in areas not
(il) Venting and purging. All hollow
management.
specifically designed for such processes. spaces, cavities or conttinere shall be
(B) In spnnklered buildings while such protection is impaired.
(CJ In the presence of explosive
atmospheres (mixtures of flammable
(C) Insist that cutters or welders and their supervisors are suitably trained in the safe operation of their equipment and the safe use of the process.
vented to permit the escape of air or gases before preheating, cutting or welding. Purging with inert gas is recommended.
qA4A62 00 ^ CONF"5
13838
Federal Renter / Vol. 55. No. 70 / Wcdneaday. April 11. 1990 / Rules and Regulations
(4) Confined spaces--(i) Accidental contact. When arc welding i to be
(CT) Helmets shall be provided with filter pletes and cover plates designed
tmeens or shields or shall be required to wear appropriate goggles.
r suspended for any substmtial period of for easy removal.
(3) Protective ciothing--General
time, such as during lunch or overnight
(D) All parts shall be constructed of a requirements. Employees exposed to the
ail electrodes shall be removed from the material which will not readily corrode hazards created by welding, cutting, or
holders and the holders carefully
or discolor the skin.
brazing operations shall be protected by
located so that accidental contact
(E) Goggles shall be ventilated to
personal protective equipment in
cannot occur and the machine be
prevent fagging of the lenses as much as accordance with the requirements of
disconnected from the power source.
practicable.
11910.132 of this pan. Appropnate
(ii) Torch vaive. In order to eliminate
(FI All glass for lenses shall be
protective clothing required for any
the possibility of gas escaping through tempered, substantially free from striae, welding operation will vary with the
leaks or improperly closed valves, when air bubbles, waves and other flaws.
size, nature and location of the work to
gas welding or cutting, the torch valves Except when a lens is ground to provide be performed.
shall be dosed and the gas supply to the proper optical correction for defective
(4) Work in confined spaces--(i)
torch positively shut off at some point
vision, the front and rear surface! of
General. As used herein confined space
outside the confined area whenever the lenses and windows shall be amooth
is intended to mean a relatively small or
torch is not to be used for a substantial and parallel.
restricted space such as a tank, boiler,
period of time, such as during lunch hour (G) Lenses shall bear some permanent pressure vessel, or small compartment
or overnight. Where practicable, the
distinctive marking by which the source of a ship.
torch and hose shall also be removed
and shade may be readily identified.
(ii) Ventilation. Ventilation is a
from the confined space. (b) Protection ofpersonnel--(1)
Central--(i) Railing. A welder or helper working on platforms, scaffolds, or
runways shall be protected against
falling. This may be accomplished by the use of railings, safety belts, life lines, or some other equally effective safeguards.
(ii) Welding cable. Welders shall place welding cable and other
(H) The following is a guide for the selection of the proper shade numbers. These recommendations may be varied
to suit the individual's needs.
Wflldn^ oparvtfon
ShM Na
SMdad maid mu vm&iQ Gn smsMsd are ssssna
tfe* (nortsr*
10
prerequisite to work in confined spaces. For ventilation requirements see paragraph (c) of this section.
(iii) Securing cylindera end machinery. When welding or cutting is being performed in any confined spaces the gas cylinders and welding machines shall be left on the outside. Before operations are started, heavy portable equipment mounted on wheels shall be'
equipment so that it is dear of
passageways, ladders, and stairways. (2) Eye protection--(i) Selection. (A)
rou ton tbs torsttl *>
Cm niflad an} a Ming (farrow*)--V***,
K*e. Ike,
*! Ill Ilf
securely blocked to prevent accidental 11 movement. 12 (iv) Lifelines. Where e welder must
r Helmets or hand shields shall be used during all arc welding or arc cutting
SMsiosd insist rc wstttng ... u.i i i WmpUs l.1||1||- ...........
operations, exduding submerged arc
welding. Helpers or attendants shall be
12 14 1frl4
14
enter a confuted space through a manhole or other small opening, means shall be provided for quickly removing him in case of emergency. When safety
provided with proper eye protection.
2 belte and lifelines are used for this
(B) Goggles or other suitable eye protection shall be used during all gas welding or oxygen cutting operations.
3 or 4
3or4
4 or S 5 or 8
purpose they shall be so attached to the welder'* body that hi* body cannot be jammed in a small exit opening. An -
Spectacles without side shields, with
4 or 4 attendant with a preplanned rescue
suitable filter lenses are permitted for use during gas welding operations on
Gss wsesno (nisMsnl to Men 10 to sicfl--_ s<*e procedure shall be stationed outside to Gas non) (hssvy) to ineft and turn___ S or * observe the welder at all time* and be
light work, for torch brazing or for inspection.
Mol*: In <ws ssiiSwi) or arrqen eunnq wim trm capable of putting rescue operations into lam troouoss a iwjn y*sov ne/n. a assnMs <0 effect.
(C) All operators and attendants of
im < nnsr or wns nu snore* ms mios or tooun Ww wins wssss tgr*ot tnscostsnon.
(v) Electrode removal When arc
resistance welding or resistance brazing
welding is to be suspended for any
equipment shall use transparent face
(I) All filter lenses and plates shall
substantial period of time, such as
shields or goggle*, depending on the
meet the test for transmission of radiant during lunch or overnight, all electrodes
particular job. to protect their faces or
energy prescribed in ANSI 287.1--
shall be removed from the holders and
eyes, as required.
1968--American National Standard
the holders carefully located so that
(0) Eye protection In the form of
Practice for Occupational and
accidental contact cannot occur and the
suitable goggle* shall be provided where Educational Eye and Face Protection.
machine disconnected from the power
needed for brasng operauona not
(ili) Protection from arc welding rays. source.
covered in paragraph* (b)(2)(i)(A)
Where the work permits, the welder
(vi) Gas cylinder shutoff. In order to
through (b)(2)(i)(C) of this section.
should be enclosed in an individual
eliminate the possibility of gas escaping
(ii) Specifications for protectors, (A)
booth painted with a finish of low
through leaks of improperly closed
Helmet* and hand shields *h*U be made reflectivity such as zinc oxide (an
valves, when gas welding or cutting, the
of a material which is an insulator for
important factor for absorbing
torch valve* shall be dosed end the
heat and electricity. Helmets, shields and goggle* shall be not readily flammable end shall be capable of withstanding sterilization.
(B) Helmets and hand shields shall be
arranged to protect the face, neck and
ear* from direct radiant energy from the arc.
ultraviolet radiations) and lamp black, or shall be enclosed with nancombustible screens similarly painted. Booths and screens shall permit circulation of air at floor level. Workers or other persons adjacent to the welding areas shall be protected from the rays
by noncombustibie or flameproof
fuel-ga* and oxygen supply to the torch positively shut off et some point outside the confined area whenever the torch is not to be used for a substantial period of time, such as during lunch hour or overnight Where practicable the torch and hose shall also be removed from the
confined space.
DO A CONFjq 044463
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Federal Register / Vol. 55, No. 70 / Wednesday. April 11. 1390 / Rules and Regulations 13S99
(vii) Warning sign. After welding operations are completed, the weider shall mark the hot metal or provide some other means of warning other workers.
(c) Health protection and ventilation--(1) General--(i) Contamination. The requirements in this paragraph have been established on the basis of the following three factors in arc and gas welding which govern the amount of contamination to which weiden may be exposed:
(A) Dimensions of space In which welding is to be done (with special regard to height of ceding).
(B) Number of welders.
(Cl Possible evolution of hazardous fumes, gases, or dust according to the metals involved.
(iil Screens. When welding must be performed in a space entirely screened on all tides, the screens shall be so arranged that no serious restriction of ventilation exists. It is desirable to have the screena so mounted that they are about 2 feet (OAl m) above the floor uniesa the work is performed at so low a level that the screen must be extended nearer to the floor to protect nearby workers from the glare of welding.
(iiil Maximum allowable concentration. Local exhaust or general ventilating systems shall be provided and arranged to keep the amount of toxic fumes, gases, or dusts below the maximum allowable concentration as specified in i 1910.1000 of this part.
(iv) Precautionary labels. A number of potentially hazardous materials are employed in fluxes.coatings, coverings, and filler metals used in welding cutting or are released to the atmosphere during welding end cutting. These include but are not limited to the materials itemized in paragraphs (c)(5) through (c)(12) of this section. The suppliers of welding materials shall determine the hazard, if any, associated with the use of their materials in welding, cutting, etc
(A) All filler metals and fusible granulsr materials shall carry the following notice, as a minimum, on tags, boxes, or other containers:
CAUTION
Welding may produce fumes end gaaee hsurdoue to health. Avoid breathing these
fumes and gases. Use adequate ventilation. See ANSI Z49.1 -1907 Safety in Welding and Cutting published by the American Welding Society.
(B) Brazing (welding) filler metals containing cadmium in significant amounts shall carry the following notice on tags, boxes, or other containers;
WARNING
CONTAINS CADMIUM--OISONOUS FUMES MAY BE FORMED ON HEATING
o not breathe (times. Use only with adequate ventilation such at fume collectors, exhaust ventilators, or air-aupptied respirators. See ANSI Z48J -1957. If chest pain, cough, or fever develop* after see call physician immediately.
(C] Brazing and gas welding fluxes containing fluorine compounds shall have a cautionary warding to indicate that they contain fluorine compounds. One such cautionary wording recommended by the American Welding Society for brazing and gas welding fluxes resds ss follows:
CAUTION
CONTAINS FLUORIDES
This flux when hasted gives off fumes that may irritate ayea. not* and throat.
1. Avoid fume*--use only in well-ventilated spaces.
Z. Avoid contact of flux with eyes or skin. 3. Do not take internally.
"(21'Ventilation forgeneral welding and cutting--(i) CeneraLMcchsnical
ventilation shall be provided when welding or cutting is done on metals not covered in paragraphs (c)(5) through (c)(l2) of this section. (For specific . material*, see the ventilation requirements of paragraphs (c)(5) through (c)(12) of this section.)
(A) In a space of leas than 10.000 cubic feet (284 m *) per weider.
(B) In a room having a ceiling height of leas than IS feet (5 m).
(C) In confined spaces or where the welding space contains partitions, balconies, or other structural barriers to the extent that they significantly obstruct moss ventilation.
(U) Minimum rat*. Such ventilation shall be et the minimum rxte of 2M0 cubic feet (57 ml per minute per welder, except where local exhaust hoods sod booths at per paragraph (c)(3) of this section, or airline respirators approved by the Mine Safety and Health Administration and tha National Institute for Occupational Safety and Health, pursuant to the provisions of 30 CFR part 11. are provided. Natural ventilation ia considered sufficient for welding or cutting operations where the restrictions in paragraph (c)(2)(i) of this section are not present.
(3) Local exhaust hoods and booths. Mechanical local exhaust ventilation may be by means of either of the following;
(i) Hoods. Freely movable hoods intended to be placed by the welder aa near as practicable to the work being welded and provided with a rate of air* flow sufficient to maintain a velocity in the direction of tha hood of 100 linear
feet (30 m) per minute in the zone of welding when the hood ia at Its most remote distance from the point of
welding. The rates of ventilation required to accomplish this control velocity using a 3-inca (7.S cm) wide flanged suction opening are shown in the following tables
.mlWon may tM non*
1 Htmrtm n**n ouct maovMs te**4 OO *SXX) Wet per mnn* vatoaty n pipa.
(U) Fixedenclosure. A fixed enclosure
with e top snd not less than two sides
which surround the welding or cutting
operations and with a rate of airflow
sufficient to maintain a velocity ewey
from the weider of not less than 100
linear feet (30 m) per minute.
(4) Ventilation in confinedspaces--{i)
Air replacement. All welding end
cutting operations carried on in confined/
spaces shall be adequately ventilated to(
prevent the accumulation of toxic
'
materials or possible oxygen deficiency.'
This applies not only to the weider but
also to helpers and other personnel in
the immediate vicinity. All air replacing
that withdrawn shall be clean and
respirable.
(ii) Airline respirators. In such
circumstances where it is impossible to
provide such ventilation, airline
respirators or hose masks approved by
the Mine Safety end Health
Administration end the National
Institute for Occupational Safety and
Health, pursuant to the provisions of 30
CFR pan 11, for this purpose, shell be
used.
(iiil Self-contained units:. In areas
immediately hazardous to life, hose
masks with blowers or self-contained
breathing equipment shall be used. The
breathing equipment shall be approved
by the Mine Safety and Health
Administration and the National
Institute for Occupational Safety and
Healtlx
(iv) Outside helper. Where welding
operations are earned on in confuted
spaces and where welders end helpers
are provided with hose masks, hose
masks with blowers or self-contained
breathing equipment approved by the
Mine Safety and Health Admtniatraiioa
D A 044464 CONFIDENTIAL
13700 Federal Renter / VoL 55. No. 70 / Wednesday, April li: 1990 / Rules and Regulations
end the National Institute for
necessary by local exhaust ventilation operations-wilt reach or be drawn into
Occupational Safety and Health, a
or airline respirators.
the atmosphere surrounding any
worker shall be stationed on the outside
(8) Beryllium. Welding or cutting
weiding operation, in addition,
of such confined spaces to insure the
indoors, outdoors, or in confined spaces trichloroethylene and perchlorethylene
safety of those working within.
involving beryllium-containing base or should be kept out of atmospheres
(v) Oxygen for ventilation. Oxygen
filler metals shall be done using local
penetrated by the ultraviolet radiation
shall never be used for ventilation..
exhaust ventilation and airline
of gae-shielded welding operations.
(5) Fluorine compounds--(\) General. respirators unless stmospheric tests
(12) Cutting of stainless steels.
In confined spaces, welding or cutting
under the most adverse conditions have Oxygen cutting, using either a chemical.
involving fluxes, coverings, or other
established that the workers' exposure flux or iron powder or gas-shielded are
materials which, contain fluorine
is within the acceptable concentrations cutting of stainless steel, shall be done
compounds shall be done in accordance defined by S 1310.1000 of this part, in all using mechanical ventilation adequate
with paragraph (c)(4) of this section. A cases, workers in the immediate vicinity to remove the fumes generated.
fluorine compound is one that contains of the weiding or cutting operations
(13) First-aid equipment First-aid
fluorine, as an element in chemical combination, not as a free gas.
(ii) Maximum allowable concentration. The need for local exhaust ventilation or airline respirators for welding or cutting in other than confined spaces will depend upon the
individual circumstances. However, experience has shown such protection to be desirable for fixed-location
production welding and for all production welding on stainless steels.
Where air samples taken at the weiding location indicate that the fluorides liberated are below the maximum
allowable concentration, such
protection is not necessary. (6) Zinc--(i) Confined spaces. In
confined spaces welding or cutting
involving zinc-bearing base or filler
metals or metals coated with zinc bearing materials shall be done in
accordance with paragraph (c)(4) of this section.
(ii) Indoors, indoors, weiding or cutting involving zinc-beanng base or filler metals coated with zinc-beering materials shall be done in accordance with paragraph (c)(3) of this section.
(7) Lead--{\) Confined spaces. In confined spaces, weiding involving leadbase metals (erroneouaiy called leadburning) shall be done in accordance with paragraph (c)(4) of thta section.
(ii) Indoors. Indoors, weiding
involving lead-base metals shall be done in accordance with paragraph (c)(3) of this section.
(iii) Local ventilation. In confined spaces or indoors, weiding or cutting involving metaia containing lead, other than as an impunty, or involving metals coated with lead-bearing materials,
including paint shall be done using local exhaust ventilation or airline
respirators. Outdoors such operations shall be done using respiratory
protective equipment approved by the
Mine Safety and Health Administration and the National InsUtute for
Occupstionel Safety and Health,
pursuant to the provisions of 30 CFR
shall be protected sa necessary by local
exhaust ventilation or airline
respirators. (9) Cadmium--(i) General. Welding or
cutting indoors or in confined spaces involving cadmium-bearing or cadmiumcoated bate metaia shall be done using
local exhaust ventilation or airline respirators unless atmospheric tests under the most adverse conditions have
established that the workers' exposure Is within the acceptable concentrations
defined by f 1310.1000 of this part. Outdoors such operations shall be done
using respiratory protective equipment such as fume respirators approved by
the Mine Safety and Health
Administration and the National
Institute for Occupational Safety and Health, pursuant to the provisions of 30 CFR part 11, for such purposes.
(U) Confined space. Welding (brazing) involving cadmium-bearing filler metaia shall be done using ventilation as prescribed in paragraph (c)(3) Or (c)(4) of this section if the work is to be done in a confined space.
(10) Mercury. Welding or cutting indoors or in a confined space involving metels coated with mercury-bearing materials including paint shall be done using local exhaust ventilation or airline respirators unless atmospheric tests under the most adverse conditions have established that the workers' exposure is within the acceptable concentrations defined by i 1910.1000 of this part
Outdoors such operations shall be done using respiratory protective equipment approved by the Mine Safety and Health Administration and the National Institute for Occupational Safety and Health, pursuant to the provisions of 30 CFR part 11. for auch purposes.
(11) Cleaning compounds--ii) Manufacturer's instructions. In the use of cleaning materials, because of their
possible toxicity or flammability,
appropriate precautiona such as
manufacturers instructions shall be followed.
(U) Degreasing. Degreasing and other
equipment shall be available at all times. Ail injuries shall be reported as soon as possible for medical attention. First aid shall be rendered until medical attention can be provided.
(d) Industrial applications--(1) Transmission pipeline--(i) General. The requirements of paragraphs (b) and (c) of this section and {1910254 of this part
shall be observed. (ii) Field shop operations. Where field
shop operations are involved for fabrication of fittings, river crossings, road crossings, and pumping and compressor stations the requirements of paragraphs (a), (b). and (c) of this secuon and { 1310253 and 1310254 of
this part shall be observed.. (iii) Electric shock. When arc welding
is performed in wet conditions, or under conditions of high humidity, special protection against electric shock shall be supplied
(iv) Pressure testing. In pressure testing of pipelines, the workers and the public shall be protected against injury by the blowing out of closures or other pressure restraining devices. Also, protection shall be provided against expulsion of loose dirt that may have become trapped in the pipe.
(v) Construction standards. The welded construction of transmission pipelines shall be conducted in accordance with the Standard lor Welding Pipe Lines and Related Facilities. API Std. 1104--1968.
(vi) Flammable substance lines. The connection, by welding, of branches to pipelines carrying flammable substances shall be performed in accordance with Welding or Hot Tapping on Equipment Containing Flammable*. API Std. PSD
No. 2201--1963. (vii) X-ray inspection. The use of X-
rays and radioactive isotopes for the inspection of welded pipeline joints shall be carried out in conformance with the American National Standard Safety Standard for Non-Medical X-ray and Sealed Camma-Ray Sources. ANSI
part n. for such purposes. In ail cases, workers in the immediate vicinity of the cutting operation shall be protected as
cleaning operations involving chlorinated hydrocarbons shall be so located that no vapors from these
Z54.1--1963. (2) Mechanical piping systems--)0
General. The requirements of
DO A 044465 CONFIDENTIAL
Federal Register / VoL 55. No. 70 / Wednesday. April 11. 1990 / Rules and Regulations 137C1
paragraphs (a), (b). and (c) of this section and ij 1910253 and 1910254 of this part shall be observed.
(ii) X-ray inspection. The use of Xrays and radioactive isotopes for the inspection of welded piping joints shall be in conformance with the American National Standard Safety Standard for Non-Medical X-ray and Sealed GammaRay Sources, ANSI Zo-bl--1963.
1910.253 Oxygen-fuel gas welding and cutting.
(a) General requirements.--(1) Flammable mixture. Mixtures of fuel gases and air or oxygen may be explosive and shall be guarded against. -No device or attachment facilitating or permitting mixtures of air.or oxygen with flammable gasea prior to consumption, except at the burner or in a standard torch, shall be allowed unless approved for the purpose.
(2) Maximum pressure. Under no
condition shall acetylene be generated, piped (except in approved cylinder manifolds) or utilized at a pressure in excess of 15 psig (103 kPa gang# pressure) or 30 psia (200 kPa absolute).
(The 30 psia (208 kPa absolute) limit is intended to prevent unsafe use of
acetylene in pressurized chambers such as caissons, underground excavations or tunnel construction.) Tills requirement is not intended to apply to storage of acetylene dissolved in a suitable solvent in cylinders manufactured and maintained according to UJ3. Department of Transportation requirements, or to acetylene for chemical use. The use of liquid acetylene shall be prohibited.
(3) Apparatus. Only approved apparatus such as torches, regulators or pressure-reducing valves, acetylenegenerators, and manifolds ahaU be used.
(4) Personnel. Workmen in charge of the oxygen or fuel-gas supply equipment including generators, and oxygen or fuel-gas distribution piping systems shall be instructed and judged competent by their employers for this important work before being left in charge. Rules and instructions covering the operation and maintenance of oxygen or fuel-gas supply equipment including generators, and oxygen or fuel-gai distribution piping systems shall be readily available.
(b) Cylinders and containers--(1) Approval and marking, (i) All portable cylinders used for the storage and shipment of compressed gases shall be constructed and maintained in
accordance with the regulations of the U.S. Department of Transportation. 49 CFR parts 171-179.
(ii) Compressed gas cylinders shall be iegtbly marked, for the purpose of
identifying the gas content, with either the chemical or the trade name of the gas. Such marking shall be by means of stenciling, stamping, or labeling, and shall not be readily removable. Whenever practical, the marking shall be located on the shoulder of the cylinder. This method conforms to the American National Standard Method for Marking Portable Compressed Gas Containers to Identify the Material Contained. ANSI Z463--1954.
(iii) Compressed gas cylinders shall be equipped with connection! complying with the American National Standard Compressed Gas Cylinder Valve Outlet and Inlet Connections, ANSI B57.1-- 1905.
(iv) All cylinders with a water weight capacity of over 30 pounds (13.S kg) shall be equipped with means of connecting a valve protection cap or with a collar or recess to protect the valve.
(2) Storage of cylinder*--general. (1)
Cylinders shall be kept away horn radiators and other sources of heat
(ii) Inside of buildings, cylinders shall be stored in a well-protected, wellventilated. dry location, at least 20 feet (6.1 m) from highly combustible
materials such as oil or excelsior. Cylinders should be stored in definitely assigned places away from elevators, stairs, or gangways. Assigned storage spaces shall be located where cylinders will not be knocked over or damaged by
passing or falling objects, or subject to tampering by unauthorized persons. Cylinders shall not be kept in unventilated enclosures such aa lockers and cuoboards.
(iii) Empty cylinders shall have their valves closed.
(iv) Valve protection caps, where cylinder is designed to accept e cap. shall always be in place, band-tight, except when cylinders are in use or connected for use.
(3) Fuel-gas cylinder storage. Inside a building, cylinders, except those in
actual use or attached ready for use. shall be limited to a total gas capacity of 2.000 cubic feet (50 m1) or 300 pounds
(135.9 kg) of liquefied petroleum gas. (i) For storage in excess cf 2X00 cubic
feet (SO mJ) total gas capacity of cylinders or 300 (135.9 kg) pounds of liquefied petroleum gas, s separate room or compartment conforming to the requirements specified in paragraphs (f)(6)(i)(H) and (D(6)(i)(I) of this secuon shall be provided, or cylinders shall be kept outside or in a special building.
Special buildings, rooms or compartments shall have no open Dame
for heating or lighting and shall be well ver.itlateti They may also be used for
storage of calcium carbide in quantities not to exceed 600 (271,6 kg) pounds.
when contained in metal containers complying with paragraphs (g)(l)(i) and
of this secuon.
(ii) Acetylene cylir.cirs shall be
stored valve end up. (4) Oxygen storage, (i) Oxygen
cylinders shall not oe stored near highly combustible material, especially oil and grease; or near reserve stocks of carbide and acetylene or other fuel-gas cylinders, or near any other substance likely to cause or accelerate firm or in an acetylene generator compartment
(ii) Oxygen cylinders stored In outside generator houses shall be separated from the generator or carbide storage rooms by a noncombustible partition having a fire-resistance rating of at least
1 hour. This partition shall be without openings and shall be gastighL
(hi) Oxygen cylinders in storage shall be separated from fuel-53s cylinders cr combustible materials (especially oil or grease), a minimum distance of 20 feet (6.1 m) or by a noncombustible barrier at least 5 feet (1.5 tn) high having a fireresistance rating of at least one-half
hour. (iv)Where a liquid oxygen system is
to be used to supply gaseous oxygen for welding or cutting and the system has a storage capacity of more than 13.000 cubic feet (364 ml of oxygen (measured at 14.7 psia (101 kPs) and 70 *F (21.1 Cl), connected in service or ready for
service, or more than 25,000 cubic feet (700 m*) of oxygen (measured at J psia (101 kPa) and 70 *F (21.1 *C)), including unconnected reserves on hand at the site, it shall comply with the provisions of the Standard for Bulk Oxygen Systems at Consumer Sites, NFFA No. 560--1905.
(5) Operating procedures, (i) Cylinders, cylinder valves, couplings, regulators, hose, and apparatus shall be kept free from oily or greasy substances. Oxygen cylinders or apparatus shall net be handled with oily hands or gloves. A jet of oxygen must never be permitted to strike an oily surface, greasy clothes, or enter a fuel oil or other storage tank.
(ii) (A) When transporting cylinders by a crane or derrick, a cradle, boat cr suitable platform shall be used. Slings or electric magnets shall not be used for this purpose. Valve-protection caps, where cylinder is designed to accept a cap. shall always be in place.
(B) Cylinders shall not be dropped or struck or permuted to strike each other
violently. (C) Valve-protection caps shall not be
used for lifting cylinders from one vertical position to another. Bars shall not be used under valves or valvcprotcction caps to pry cylinders loose
when frozen to the ground or otherwise
00 A 0444<A Conf^obnttal
13702
Federal Register / Vol. 55. No. 70 / Wednesday. April 11. 1990 / Rules and Regulations
fixed: the use of warm (not boiling!
be made to repair them. If trouble is
stem of the valve while tbe cylinder is in
'-r is recommended. Valve-protection experienced, the supplier should be sent use so that the fuel-gas flow can be
r are designed to protect cylinder is from damage. .0) Unless cylinders arer secured on a
a report promptly indicating the character of the trouble and the cylinder's serial number. Supplier's
quickly turned off in case of emergency. In the case of manifolded or coupled cylinders at least one such wrench shall
special truck. regulators shall be*
instructions as to its disposition shall be always be svailable for immediate use.
removed and valve-protection caps,
followed.
(c) Manifolding of cylinders--(l) Fuel-
when provided for. shall be put in place
(2) Complete removal of the stem from gas manifolds, (i) Manifolds shall be
before cylinders are moved.
a diaphragm-type cylinder veive shell
approved either separately for each '
() Cylinders not having fixed hand
be avoided.
component part or as an assembled unit.
wheels shall have keys, handles, or
(iii)(A) Fuel-gas cylinders shall be
(ii) Except as provided in paragraph
nonadjustable wrenches on valve stems placed with valve end up whenever they (c](l)(iii) of this section fuel-gas
while these cylinders are in service. In are in use. Liquefied gases shall be
cylinders connected to one manifold
multiple cylinder installations only one stored and shipped with the valve end
inside a building shall be limited to a
key or handle is required for each
up.
total capacity not exceeding 300 pounds
manifold.
(B] Cylinders shall be handled
(135O kg) of liquefied petroleum gas or
(FI Cylinder valves shall be closed
carefully. Rough handling, knocks, or
3,000 cubic feet (84 m 3) of other fuel-
before moving cylinders. (G] Cylinder velvet shall be dosed
when work is finished. (H) Vaives of empty cylinders shall be
dosed. (1) Cylinders shall be kept far enough
away from the actual welding or cutting
operation so that sparks, hot slag, or flame will not reach them, or fireresistant shields shall be provided.
(]] Cylinders shall not be placed where they might become pan of an
electric circuit- Contacts with third rails, trolley wires, etc. shall be avoided.
Cylinders shall be kept away from
radiators, piping systems, layout tables, etc. that may be used for grounding f *tnc circuits such as for arc welding * bines. Any practice such as the
.iping of an eiectroda against a cylinder to ttnke an arc shall be prohibited.
(K1 Cylinders shall never be used as rollers or supports, whether full or empty.
(L) The numbers and markings stamped into cylinders shall not be tamoered with.
(Ml No person, other than the gat supplier, shall attempt to mix gates in a cylinder. No one. except the owner of the cylinder or person authorized by him. shall refill a cylinder.
(N1 No one shall tamper with safety devices in cylinders or valves.
falls are liable to damage the cylinder, valve or safety devices and cause leakage.
(C) Before connecting a regulator to a
cylinder valve, the valve shall be opened slightly and dosed immediately.
The vdve shall be opened while standing to one side of the outlet never In from of it Never crack a fuel-gas
cylinder valve near other welding work or near sparks, flame, or other possible
sources of ignition. () Before a regulator is removed from
a cylinder valve, tbe cylinder valve shall
ba dosed and the gas released from the regulator.
(E) Nothing shall be placed on top of an acetylene cylinder when in use which may damage the safety device or interfere with the quick dosing of the
valve. (F] If cylinders are found to have
leaky valves or fittings which cannot be stopped by dosing of the valve, the cylinders shall be taken outdoors eway from sources of ignition and slowly emptied.
(G1A warning should be placed near cylinders having leaking fuse plugs or other leaking safety devices not to approach them wuh a lighted dgarctte or other source of ignition. Such cylinders should be plainly tagged: the supplier should be promptly notified and his instructions followed as to their
gas. Mon than one such manifold with connected cylinders may be located in the same room provided the manifolds are at least 50 feet (IS m) apart or separated by e noncombustible barrier
at least 5 feet (1.5 m) high having a fireresistance rating of at least one-half
hour. (iii) Fuel-gas cylinders connected to
one manifold having an aggregate capacity exceeding 300 pounds (135.0
kg] of liquefied petroleum gas or 3.000 cubic feet (84 m 3) of other fuel-gas shall be located outdoors, or in a separate building or room constructed in accordance with paragraphs (Q(8)(i)(H)
and (0(6)10(11 of this section. (iv) Separate manifold buildings or
roams may also be used for the storage of drums of calcium carbide and cylinders containing fuel gases as provided in paragraph (b)(3) of this section. Such buildings or rooms shall have no open flames for heating or lighting and shall be well-ventilated.
(v) High-pressure fuel-gas manifolds shall be provided with approved pressure regulating devices.
(2)High-pressure oxygen manifolds (for use with cylinders having a Department of Transportation service pressure above 200psig (1*33 MPa)), (i) Manifolds shall be approved either separately for each component part or
(O) Cylinders shall not be dropped or return.
otherwise roughly handled.
(H) Safety devices shell not be
a* an assembled unit.* (ii) Oxygen manifolds shall not be
(P) Unless connected to a manifold,
tampered with.
located in an acetylene generator room.
oxygen from a cylinder shall not be used (I) Fuel-gas shall never be used from Oxygen manifolds shall be separated
without first attaching an oxygen regulator to the cylinder valve. Before
cylinders through torches or other devices equipped with shutoff valves
from fuel-gas cylinders or combustible mstenals (especially oil or grease), a
connecting the regulator to tha cylinder without reducing the pressure through a minimum distance of 20 feet (8.1 m) or
valve, the valve shall be opened slightly suitable regulator attached to the
by a noncombuitible barrier at least 5
for an instant and then dosed. Always cylinder valve or manifold.
feet (14 m) high having a fire-resistance
stand to one side of the outlet when
0) The cylinder valve shall always be rating of at least one-half hour.
opening the cylinder valve.
opened slowly.
(iii) Except as provided in paragraph
(Qj A hammer or wrench shall not ba
(K) An acetylene cylinder valve shall (c)(2)(iv) of this section, oxygen
used to open cylinder valves. If valves not be opened more than one and one- cylinders connected to one manifold
cannot be opened by hand, the supplier half turns of the sptndie. and preferably shall be limited to a total gas capacity of
hail be notified.
no more than three-founhs of a turn.
8.000 cubic feet (188 m 3). More than one
R)U1 Cylinder vaives shall not be
(L) Where a special wrench it
such manifold with connected cylinders
npered with nor should any attempt required it ahall be left In position on the may be located in the same room
Federal Register / Vol. 55, No. 70 / Wednesday, April 11. 1990 / Rules and Regulations 15703
provided the manifolds are at least 50 feet (15 m| apart or separated by a
noncombustible barrier at least 5 feet (1.5 m) high having a fire-resistance rating of at least one-half hour.
(iv) An oxygen manifold, to which
cylinders having an aggregate capacity of more than 6.C00 cubic feet (IBS m3) of oxygen are connected, should be located outdoors or in a separate noncombustible building. Such a manifold, if located inside a building having other occupancy, shall be located in a separate room of noncombustible construction having a fire-resistance rating of at least one-half hour or in an area with no combustible material
within 20 feet (6.1 m) of the manifold. (v) An oxygen manifold or oxygen
bulk supply system which has storage
capacity of more than 13X00 cubic feet (364 m 4) of oxygen (measured at 147 psia (101 kPa) and 70 *F (21.1 *q).
connected in service or ready for service, or more than 21000 cubic feet (700 m 4) of oxygen (measured at 14.7 psia (101 kPe) and 70 '? (21.1 *qj,
including unconnected reserves on hand at the site, shall comply with the provisions of the Standard for Bulk
Oxygen Systema at Consumer Sites. NFPA No. 566-1065.
(vj) High-pressure oxygen manifolds shall be provided with approved pressure-regulating devices.
(3) Low-pressure oxygen manifolds (far use with cylinders having a Department of Transportation service pressure not exceeding 200psig (US MPa)), (i) Manifolds shall be of
substantial construction suitable for use with oxygen at a pressure of 250 psig (1.7 MPa). They shall have a minimum bursting pressure of 1X00 psig (0.6 MPa) and shall be protected by a safety relief device which will relieve at a maximum pressure of 500 psig (3.4 MPa). DOT4L200 cylinders have safety devices which relieve at a maximum pressure of 250 psig (1.7 MPa) (or 235 psig (1.8 MPa) if vacuum insulation is used).
(ii) Hose and hose connections subject to cylinder pressure shall comply with paragraph (e)(5) of this section. Hose shall have a minimum bursting pressure of 1.000 psig (8.3 MPa).
(iii) The assembled manifold including leads shall be tested end proven gastight at a pressure of 300 psig (2.04 MPa). The fluid used for testing oxygen manifolds shall be oil-free and not combustible.
(iv) The location of manifolds shall comply with paragraphs (c|(2)(ii), (c)(2)(iii). (c)(2)[iv). and (c)(2)(v) of this section.
(v) The following sign shall be
conspicuously posted at each manifold:
Low-Pressure Manifold Do Not Connect High-Pressure Cylinders Maximum Pressure--250 psig (17 MPa)
(4) Portable outlet headers. (1) Portable outlet headers shall not be used indoors except for temporary service where the conditions preclude a direct supply from outlets located on the
service piping system. (ii) Each outlet on the service piping
from which oxygen or fuel-gas is withdrawn to supply a portable outlet
header shall be equipped with a readily accessible shutoff valve.
(iii) Hose and hose connections used for connecting the portable outlet header to the service piping shall comply with paragraph (e)l5) of this section.
(iv) Master shutoff valves for both
oxygen and fuel-gaa shall be provided at the entry end of the portable outlet header.
(v) Portable outlet headers for fuel-gas
service shall be provided with an approved hydraulic back-pressure valve
installed at the inlet and preceding the service outlets, unless an approved
pressure-reducing regulator, an approved back-Qow check valve, or an
approved hydraulic back-pressure valve is installed at each outlet Outlets provided on headers for oxygen service may.be fitted for use with pressurereducing regulators or for direct hose connection.
(vi) Each service outlet on portable outlet headers shall be provided with e
valve assembly that Indudes a detachable outlet seal cap. chained or otherwise attached to the body of the valve.
(vii) Materials and fabrication procedures for portable outlet headers shall comply with paragraphs (d)(l],(dl(2), and (d](5) of this section.
(viii) Portable outlet headers shall be provided with frames which will support the equipment securely in the coma operating position and protect them from damage during handling and operation.
(5)Manifold operation procedures, (i) Cylinder manifolds shall be installed under the supervision of someone familiar with the proper practices with reference to their construction and use.
(ii) All manifolds and parts used in methods of manifolding shall be used only far the gas or gases for which they are approved.
(iii) When acetylene cylinders are coupled, approved (lash arresters shall be installed between each cylinder and
the coupler block. For outdoor use only, and when the number of cylinders coupled does not exceed three, one flash arrester installed between the coupler
block and regulator is acceptable.
(iv) The aggregate capacity of fucl-gas S'
cylinders connected to a portable
f
manifold inside a building shall not V.
exceed 3.000 cubic feet (84 m 4) of gas.
(v) Acetylene and liquefied fuel-gas
cylinders shall be manifolded in a
vertical position.
(vi) The pressure in the gas cylinders
connected to and discharged
simultaneously through a common
manifold shall be approximately equal
(d) Service piping systems--(1)
Materials and design. (i)(A) Piping and
fittings shall comply with section 2.
Industrial Gas and Air Piping Systems,
of the American National Standard
Code for Pressure Piping ANSI B31.1,
1907. insofar as it does not conflict with
paragraphs (d)(l](i)(A](l) and
(d)(l)(i)(A)(2) of this section:
(2) Pipe shall be at least Schedule 40
and fittings shall be at least standard
weight in sizes up to and including 6-
inch nominal.
[2] Copper tubing shall be Types K or
l in accordance with the Standard
Specification for Seamless Copper
Water Tube, ASTM B88-66*.
(B) Piping shall be steel wrought iron,
brass or copper pipe, or seamless
copper, brass or stainless steel tubing,
except as provided in paragraphs
/
(d)(l)(ii) and (d)(l)(iii) of this section. /
(ii) (A) Oxygen piping and fittings at \
pressures in excess of 700 pai (4.8 MPa l -
shall be stainless steel or copper alloys.
(B) Hose connections and hose
complying with paragraph (e)(5) of this
section may be used to connect the
outlet of a manifold pressure regulator
to piping providing the working pressure
of the piping is 250 psi (17 MPa) or less
and the length of the hose does not
exceed 5 feet (IX m). Hose shall have a
minimum bursting pressure of 1.000 psig
(6.8 MPa).
(C) When oxygen it supplied to a
service piping system from a low-
pressure oxygen mamfold without an
intervening pressure regulating device,
the piping system shall have a minimum
design pressure of 250 psig (1.7 MPa). A
pressure regulating device shall be used
at each station outlet when the
connected equipment is for use at
pressures less than 250 psig (1.7 MPa).
(iii) (A) Piping for acetylene or
acetylenic compounds shall be steel or
wrought iron.
(B) Unalloyed copper shall not be
used for acetylene or acetylenic
compounds except in listed equipment.
(2) Piping joints, (i) Joints in steel or
wrought iron piping shall be welded,
threaded or flanged. Fittings, such ss
ells, tees, couplings, and unions, may be
roiled, forged or cast steel, malleable
DO A 044468 CONFIDENTIAL
13704 Federal Resister / Vol. 55, No. 70 / Wednesday, April 11. 1990 / Rules and Regulations
'ron or nodular iron. Cray or white cast ron fittings are prohibited.
(ii) Joints in brass or copper pipe shall be welded, brazed, threaded, or flanged.
If of the socket type, they shall be brazed with silver-brazing alloy or similar high melting point (not less than
800*F [42TC)] filler metaL (iii) Joints is seamless copper, brass,
c: stainless steel tubing snail be approved gas tubing fittings or the joints shall be brazed. If of the socket type, they shall be brazed with silver-brazing alloy or similar high melting point (not less than 600*F (427*0) filler metaL
(3) Installation, (i) Distribution lines shall be installed and maintained in a safe operating condition.
(ii) Ail piping shall be run as directly
as practicable, protected against
physical damage, proper, allowance
being made for expansion and contraction, jarring and vibration. Pipe
laid underground in earth shall be located below the frost Line and
protected against corrosion. After
assembly, piping shell be thoroughly blown out with air. nitrogen, or carbon
dioxide to remove foreign materials. For oxygen piping, only oil-free air, oil-free
nitrogen, or oil-free carbon dioxide shall be used.
(iii) Only piping which has been
welded or brazed shall be installed in tunneis, trenches or ducts. Shutoff
valves shall be located outside such conduits. Oxygen piping may be placed in the same tunnel, trench or duct with fuel-gas pipelines, provided there ia good natural or forced ventilation.
(ivj Low points in piping carrying moist gas shall be drained into drip pots constructed so as to permit pumping or draining out the condensate at necessary intervals. Drain valves shall be installed for this purpose having outlets normally dosed with screw caps or plugs. No open end valves or
petcocks shall be used, except that In
'nitrogen, or oil-free carbon dioxide shall
drips located out of doors, underground, be uaed to purge oxygen lines.
and not readily accessible, valves may
(4) Painting and signs, (i)
be used at such points if they are
Underground pipe and tubing and
equipped with means to secure them in outdoor ferrous pipe and tubing shall be
the dosed position. Pipes leading to the covered or painted with a suitable
surface of the ground shall be cased or material for protection against
jacketed where necessary to prevent
corrosion.
loosening or breaking. (v) Gas cocks or valves shall ba
provided for all buildings at points where they will be readily accessible for shutting off the gas supply to these buildings in any emergency. There shall also be provided a shutoff valve is the discharge line from the generator, gaa holder, manifold or other source of
supply. (vi) Shutoff valves shall not be
installed in safety nlief lines in such a manner that the safety relief device can be rendered ineffective.
{vii} Fittings and lengths of pipe ihall be examined internally before assembly and. if necesaary freed from scale or did. Oxygen piping and fittings shall be
washed out with a suitable solution which will effectively remove grease . and dirt but will not react with oxygen.
Hot water solutions of caustic soda or
trisodium phosphate are effective cleaning agents for this purpose.
(viii) Piping shall ba thoroughly blown out after assembly to remove foreign materials. For oxygen piping, oil-free air. oil-free nitrogen, or oil-free carbon dioxide shall be used. For other piping, air or inert gBs may be used.
(Lx) When flammable gas lines or other parts of equipment are being purged of air or gas, open lights or other
sources of ignition shall not be permitted near uncapped openings.
(x) No welding or cutting shall be
(ii) Aboveground piping systems shall be marked in accordance with the American National Standard Scheme for the Identification of Piping Systems. ANSI A13-1-1958.
(iii) Station outlets shall be marked to indicate the name of the gae.
(5) Testing, (i) Piping systems sball be tested end proved gaslight at 1 bh times the maximum operating pressure, and shall be thoroughly purged of eir before being placed in service. The materiel used for testing oxygen lines shall be oil free and noncombusuble. Flames shall not be used to detect leaks.
(ii) When flammable gaa lines or other parts of equipment are being purged of air or gas. sources of ignition snail not be permitted near uncapped openings.
(e) Protective equipment, hose, and regulators--(l) General. Equipment shall be installed and used only in the service for which it is approved end as recommended by the manufacturer.
(2) Pressure relief devices. Service piping systems shall be protected by pressure relief devices set to function at not more than the design pressure of the. systems and discharging upwards to a safe location.
(3) Piping protective equipment (i) The fuel-gas and oxygen piping systems, including porteble outlet headers shall incorporate the protective equipment shown in Figures Q-l. Q-Z. and Q-3.
performed on an acetylene or oxygen
When only a portion of a fuel-gas
pipeline, including the attachment of
system is to be used with oxygen, only
hangers or supports, until the line has
that portion need comply with this
been purged. Only oil-free air, oil-free
paragraph (e)(3)(i).
DO A 0A44A9 CONFIDENTIAL
Federal Radiator / Vol. 55. No. 70 I Wednesday, April It. 1990 / Rules and Reflations 13705
LEGEND
Pf Protective equipment in fuel gas piping S,--Backflow prevention device(s)
V t` Fuel gas station outlet valve
at fuel gas station outlet
Vo' oxygen station outlet valve
S0--Backflow prevention device<s)
at oxygen station outlet
(iil Approved protective equipment (designated Pr in Figures Q-l. Q-2. and Q-3) shall be installed in fuel-gas piping to prevent:
(A) Backflow of oxygen into the fuelgas supply system:
(B) Passage of a flash back into the fuel-gas supply system: and
(C) Excessive back pressure of oxygen in the fuel-gas supply system. The three functions of the protective equipment may be combined in one device or may be provided by separate devices.
(!) The protective equipment shall be located in the mam supply line, as in Figure Q-l or at the head of each branch line, as in Figure Q-2 or at each location where fuel-gas is withdrawn, as in
Figure Q-3. Where branch lines are of 2inch pipe size or larger or of substantial length, protective equipment (designated
as P?) shall be located as shown in either Q-2 and Q-3.
(2) Backflow protection shall be provided by an approved device that will prevent oxygen from flowing into the fuei-gaa system or fuel from flowing into the oxygen system (see Sr, Figures Q-4 and Q-2).
(J) Flash-back protection shall be provided by an approved device that will prevent flame from passing into the fuel-gas system.
(V) Back-pressure protection shall be provided by an approved pressure-relief device set at a pressure not greater than the pressure rating of the backflow or the flashback protection device,
whichever is lower. The pressure-relief device shall be located on the downstream side of the beckflow and flashback protection devices. The vent from the pressure-relief device shall be at least as large as the relief device inlet
and shall be installed without low points that may collect moisture. If low points are unavoidable, drip poU with drains closed with screw plugs or caps shall be installed at the low points. The
vent terminus shall not endanger personnel or property through gas discharge; shall be located awey from ignition sources:.and shall terminate in a hood or bend.
(iii) If pipeline protective equipment Incorporates a liquid, the liquid level shall be maintained, and a suitable antifreeze may be used to prevent freezing.
(iv) Fuel gas for use with equipment not requiring oxygen shall be withdrawn upstream of the piping protective
devices. (4) Station outlet protective
equipment (i) A check veive. pressu regulator, hydraulic seal, or combine of these devices snail be provided at
DO A 044470 CONFIDENTIAL
13700 Federal Register / Vol. 55. No. 70 / Wednesday, April 11. 1590 / Rules and Regulations
each station outlet including those on
300 psi (Z04 MPa). Oil-free air or an oil- generator or its connections. Acetylene
oortable headers, to prevent backflow, free inert gas shall be used for the test generators shall be grounded.
j shown in Figures Q-l. Q-Z and Q-3
(v) Hose showing leaks, burns, worn
(B) Generators shall be placed where
and designated as S* and So.
places, or other defects rendering it unfit water will not freeze. The use of
(iil When approved'pipeline
for service shall be repaired or replaced. common salt (sodium chloride) or other
protective equipment (designated Pf) is
(6) Pressure-reducing regulators, (i)
corrosive chemicals for protection
located at the station oudet as in Figure Pressure-reducing regulators shall be
against freezing is not permitted. (For
Q-3. no additional check valve, pressure used only for the gas and pressures for heating systems see paragraph (f)(6)(iii)
regulator, or hydraulic seal is required. which they are intended. The regulator of this section.)
(iii) A shutoff valve (designated Vr
inlet connections shall comply with
(C) Except when generators are
and V0] shall be installed at each
Regulator Connection Standards. 1958. prepared in accordance with paragraph
station outlet and shall be located on the Compressed Gas Association.
(f)(7)(v) of this section, sources of
upstream side of other station outlet
(ii) When regulators or parts of
ignition shall be prohibited in outside
equipment.
regulators, including gages, need repair, generator houses or inside generator
(tv) !f the station outlet is equipped
the work shall be performed by skilled rooms.
with a detachable regulator, the outlet
mechanics who have been properly
(D) Water shall not be supplied
shall terminate in a union connection
instructed.
through a continuous connection to the
that complies with the Regulator
(iii) Gages on oxygen regulators shall generator except when the generator ts
f
Connection Standards. 1358, Compressed Gas Association.
(v) If the station outlet la connected directly to a hose, the outlet shall terminate in a union connection complying with the Standard Hose Connection Specifications. 1957, Comoressed Gas Association.
(vs) Station outlets may terminate in pipe threads to which permanent connections are to be made, such as to a machine.
(vii) Station outleta shall be equipped with a detachable outlet seal cap secured in place. This cap shall be used to seal the outlet except when a hose, a egulator. or piping is attached.
(viii) Where station outlets are equipped with approved backflow and flashback protective devices, as many
be marked "USE NO OIL." (iv) Union nuts and connections on
regulators shall be inspected before use to detect faulty seats which may cause
leakage of gas when the regulators are attached to the cylinder valves.
(f) Acetylene generators--(1) Approval and marking, (i) Generators
shall be of approved construction and shall be plainly marked with the maximum rate of acetylene in cubic feet per hour for which they are designed:
the weight and size of carbide necessary for a single charge: the manufacturer^ name and address: and the name or number of the type of generator.
(ii) Carbide shall be of the size marked on the generator nameplate.
(2) Rating and pressure limitations, (i) The total hourly output of a generator shall not exceed the rate for which it is
provided with an adequate open overflow or automatic water shutoff which will effectively prevent overfilling
of the generator. Where a noocontuiuous connection is used, the supply Line shall terminate at a point not less than 2 inches (5 cm) above the regularly provided opening for filling so that the water can be observed as it
enters the generator. (E) Unless otherwise specifically
approved, generators shall not be fitted with continuous drain connections leading to sewers, but shall discharge through an open connection into a suitably vented outdoor receptacle or residue pit which may have such connections. An open connection for the sludge drawoff is desirable to enable the generator operator to observe leakage of
as four torches may be supplied from
approved and marked. Unless
generating water from Ihe^dram valve or
one station outlet through rigid piping,
specifically approved for higher ratings, sludge cock.
provided each outlet from such piping is carbide-feed generators shall be rated at
(iij(A) Each generator shall be
equipped with a shutoff valve and
1 cubic foot (0.028 m*) per hour per
provided with a vent pipe.
provided the fuel-gas capacity of any
pound of carbide required for a tingle
(B) The escape or relief pipe shall be
one torch does not exceed 15 cubic feet (0.42 m*) per hour. This paragraph
(e)(4)(viii) does not apply to machines.
complete charge. (ii) Relief valves shall be regularly
operated to insure proper funenontng.
rigidly installed without traps and so that any condensation will dram back to the generator.
(5) Hose and hose connections, (i)
Relief valves for generating chambers
(C) The escape or relief pipe snail be
Hose for oxy-fuel gas service shall
shall be set to open at a pressure not in earned full size to a suitable point
comply with the Specification for
excess of 15 pstg (103 kPa gauge
outside the building. It shall terminate in
Rubber Welding Hose. 1950.
pressure). Relief valves for hydraulic
a hood or bend located at least 12 feet
Compressed Gas Association and
back pressure valves shall be set to
(3.7 m) above the ground, preferably
Rubber Manufacturers Association.
open at a pressure not in exceaa of 20
above the roof, and as far away aa
(ii) When parallel lengths of oxygen
pstg (137 kPa gauge pressure).
practicable from windows or other
and acetylene hose are taped together
(iii) Nonautomatic generators shall not openings into buildings and as far away
for convenience and to prevent tangling, be used for generating acetylene at
as practicable from sources of ignition
not more than 4 inches (10J cm) out of
pressures exceeding 1 pstg (7 kPa gauge such as flues or chimneys end tracks
12 inches 130.5 cm) shall be covered by tape.
pressure), and all water overflows shall used by locomotives. Generating
be visible.
chamber relief pipes shall not be inter
(iii) Hose connections shall comply
(3) Location. The space around the
connected but shall be separately led to
with the Standard Hose Connection
generator shall be ample for free,
the outside air. The hood or bend shall
Specifications. 1957. Compressed Gas
unobstructed operation and
be so constructed that it will not be
- Association.
maintenance and shall permit ready
obstructed by rain. snow. ice. insects, or
(iv| Hose connections shall be
adjustment and charging.
birds. The outlet shall be at least 3 feet
clamped or otherwise securely fastened
(4) Stationary acetylene generators
(0.9 m) from combustible construction.
jn a manner that will withstand, without leakage, twice the pressure to which
ney are normally subjected in service, ut in no case less man a pressure of
(automatic and nonautomatic). (i)(A) The foundation shall be so arranged that the generator will be level and so that no excessive strain will be placed on the
(iii)(A) Cae holders shall be constructed on the gasometer principle,
the bell being suitably guided. The gas bell shall move freely without tendency
DO A 044471
Federal Register / Vol. S3. No. 70 / Wednesday, April 11. 1990 / Rules and Regulations 13707
to bind and ihall have a clearance of at least 2 inches (5 cm) from the shelL
(B) The gas holder may be located In the generator room, in a separate room or out of doors. In order to prevent collapse of the gas bell or infiltration of air due to a vacuum caused by the compressor or booster pump or cooling of the gas. a compressor or boaster cutoff shall be provided at a point 12 inches (OJ m) or more above the landing point of the bclL When the gas holder is located indoors, the room shall be ventilated in accordance with paragraph (fl(8](ti) of this section and heated and lighted in accordance with paragraphs (016)(iii) and (f)(6)(iv) of this section.
(Cl When the gas holder is not located within a heated building, gas holder seals shall be protected against freezing.
(D) Means shall be provided to stop the generator-feeding mechanism before the gas holder reaches the upper limit of its travel.
() When the gas holder is connected to only one generator, the gas capacity of the holder shall ba not less than one-
third of the hourly rating of the
generator. (F) If acetylene is used from the gas
holder without increase in pressure at
some points but with increase in pressure by a compressor or booster pump at other points, approved piping protective devices shsll be installed in
each supply line. The low-pressure
.
protective device shall be located
f
between the gat holder and the shop \
piping, and the medium-pressure
protective device shall be located
between the compressor or booster
pump and the shop piping (see Figure Q-
4). Approved protective equipment
(designated Pr) is used to prevent:
Backflow of oxygen into the fuel-gas
supply system: passage of a flashback
into the fuel-gas supply system: and
excessive back pressure of oxygen in
the fuel-gas supply system. The three
functions of the protective equipment
may be combined in one device or may
be provided by separate devices.
LOW-PRESSURE PIPING
PIPING PROTECTIVE DEVICE
Figure Q-4
(iv) (A) The compressor or booster system shall be of en approved type.
(B) Wiring end electrical equipment in compressor or booster pump rooms or enclosures shall conform to the provisions of { 1910.324 of this part for Class 1. Division 2 locations.
(C) Compressors and booster pump equipment shall be located in well-
ventilated areae away from open flames.
electrical or mechanical sparks, or other ignition sources.
(D) Compressor or booster pumps shall be provided with pressure relief valves which will relieve pressure exceeding IS psig (103 kPa gauge pressure) to a safe outdoor location aa provided in paragraph (f)(4)(ii) of this section, or by returning the gas to the inlet side or to the gas supply source.
(E) Compressor or booster pump discharge outlets shall be provided with approved protective equipment (See paragraph (e) of this section.)
(5) Portable acetylene generators, (i) . (A) Ail portable generators shall be of a type approved for portable use.
(B) Portable generators shall not be used within 10 feet (3 ml of combustible material other than the floor.
DO A DO/V/r
<4<
13708
Federal Register / Vot, 55. No. 70 / Wednesday. April 11. 1990 / Rules and Regulations
(Cl Portable generators shall not be
walls or roofs. The venting areas shall
used in rooms of total volume less than be equal to not less than 1 square foot
S times the total gas-generating
(0.09 m1) per SO cubic feet (1.4 m3) of
capacity per charge of all generators in room volume and may consist of any
the room. Generators shall not be used one or any combination of the following:
in rooms having a ceiling height of less Walls of light, noncombustible material
than 10 feet (3 m), (To obtain the gas
preferably single-thickness, single
generating capacity in cubic feet per
strength glass; lightly fastened hatch
cherge. multiply the pounds of carbide cavers: lightly fastened swinging doors
per charge by 44.]
in exterior walls opening outward:
(D) Portable generators shall be
lightly fastened walla or roof designed
protected against freezing. The use of
to relieve at a maximum pressure of 25
salt or other corrosive chemical to
pounds per square foot (0.001 MPa).
prevent freezing is prohibited.
(F) The installation of acetylene
(ii) (A) Portable generators shall be
generators within buildings shall be
cleaned and recharged and the air
restricted to buildings not exceeding one
mixture blown off outside buildings.
story in height: provided. However, that
(8] When charged with carbide,
this will not be construed as prohibiting
portable generators shall not be moved such installations on the roof or top floor
by crane or derrick.
of a building exceeding such height.
(Cl When not in use, portable
(G) Generators installed inside
generators shall not be stored in rooms buildings shall be enclosed in a separate
in which open flames are used unless
room.
the generators contain no carbide and
(H) The walls, partitions, floors, and
have been thoroughly purged of
ceilings of inside generator rooms shall
acetylene. Storage rooms shall be well be of noncombustible construction
ventilated.
having a fire-resistance rating of at least
(D] When portable acetylene
1 hour. The walls or partitions shall be
generators are to be transported and
continuous from floor to ceiling and
operated on vehicles, they shall be
shall be securely anchored. At least one
securely anchored to the vehicles, if
wail of the room shall be an exterior
transported by truck, the motot shall be walL
turned off during charging, cleaning, and
(I) Openings from an inside generator
generating periods.
room to other parts of the building shall
() Portable generators shall be oca ted at a safe distance from the
be protected by a twinging type, selfclosing Are door for a Class B opening
welding position to that they will not be and having a rating of at least 1 hour.
exposed to sparks, slag, or misdirection Windows in partitions shall be wired
of the torch flame or overheating from hot materials or processes.
(61 Outside generator houses and inside generator rooms for stationary
acetylene generators, (i) (A) No opening
glass and approved metal frames with fixed sash. Installation shall be in accordance with the Standard for the
Installation of Fire Doom and Windows. NFPA 80-1970.
in any outside generator house shall be
(ii) Inside generator rooms or outside
located within S feet (14 m) of any
generator houses shall be well
opening in another building. (B) Walls, floors, and roofs of outside
generator houses shall be of
noncombustible construction. (Cl When a part of the generator
house is to be used for the storage or
manifolding of oxygen cylinders, the space to be so occupied shall be
ventilated with vents located at floor and ceiling levels.
(iii) Heating shall be by steam, hot water, enclosed electrically heated elements or other indirect means.
Heating by flames or fires shall be
prohibited in outside generator houses
or inside generator roams, or in any
separated from the generator or carbide enclosure communicating with them.
storage section by partition walls
(iv)(A) Generator houses or rooms
continuous from floor to roof or ceiling, of the type of construction stated in paragraph (f](6)(i](H) of this section.
shall have natural light during daylight hours. Where artificial lighting is necessary it shall be restricted to
Such separation wails shall be without electric lamps installed in a fixed
openings and shall be joined to the floor, position. Unless specifically approved
other walla and ceiling or roof in a
for use in atmospheres containing
manner to effect a permanent gas-tight joint.
acetylene, such lamps shall be provided with enclosures of glass or other
(0) Exit doors shall be located so as to noncombustible material so designed
be readily accessible in case of emergency.
(E) Explosion venting for outside
enerator houses and inside generator .ooms shall be provided in extenor
and constructed as to prevent gas vapors from reaching the lamp or socket
and to resist breakage. Rigid conduit with threaded connections shall be used.
(B) Lamps installed outside of wired-
glass panels set in gas-tight frames in the exterior walls or roof of the generator house or room are acceptable.
(v) Electric switches, telephones, and
all other electrical apparatus which may cause a spark, unless specifically approved for use inside acetylene generator rooms, shall be located outside the generator house or in a room or space separated from the generator room by a gas-tight partition, except that where the generator system is designed
so that no carbide fill opening or other part of the generator is open to the generator house or room during the operation of the generator, and so that residue is carried in dosed piping from the residue discharge valve to e point outside the generator house or room, electrical equipment in the generator house or room shall conform to the provisions of Subpart S of this pan for
Gass L Division 2 locations. (7) Maintenance and operation, (i)
Unauthorized persons shall not be permitted in outside generator houses or inside generator rooms.
(A) Operating instructions shall be posted in a conspicuous place near the
generator or kept in a suitable place available for ready reference. ' (B) When recharging generators the order of operations specified in the Instructions supplied by the manufacturer shall be followed.
(C) In the case of batch-type generators, when the charge of carbide is exhausted and before additional carbide is added, the generating chamber shall always be flushed out with water, renewing the water supply in accordance with the instruction card furnished by the manufacturer.
(D) The weter-carbide residue mixture drained from the generator shall not be discharged into sewer pipes or stored in areas near open flames. Gear water from residue settling pits may be discharged into sewer pipes.
(ii) The carbide added each time the generator is recharged shall be sufficient to refill the space provided for carbide without ramming the charge. Steel or other ferrous tools shall not be used in distributing the charge.
(iii) Generator water chambers shall be kept filled to proper level at all times except while draining during the recharging operation.
(tv) Whenever repairs are to be made or the generator is to be charged or carbide is to be removed, the water chamber shall be filled to the proper
leveL (v) Previous to making repairs
involving welding, soldering, or other hot work or other operations which
DO A 044473 CONFIDENTIAL
Federal Register / VoL 55, No. 70 / Wednesday. April 11, 1990 / Rules and Regulations 13723
produce a source of ignition, the carbide
(iii) Calcium carbide in excess of 5.000 temperature of the cooling sir does not -
charge and feed mechanism shall be
pounds (2288 kg) shall be stored in one- exceed 40 *C (104 *F) and where the
completely removed. All acetylene shall story buildings without cellar or
altitude does not exceed 3,300 feet
be expelled by completely flooding the basement and used for no other purpose, (1.005-8 ra). and shall be suitable for
generator shell with water and the
or in outside generator houses, if the
operation in atmospheres containing
generator shall be disconnected from the storage building is of noncombustibie - gases, dust, and light rays produced by
piping system. The generator shall be
construction, it may adjoin other one-
the welding arc.
kept filled with wster. if possible, or
story buildings if separated therefrom by (ii) Unusual service conditions may
positioned to hold as much water as
unpterced firewalls: if it is detached less exist and in such circumstances
possible.
than 10 feet (3 m) from such building or machines shall be especially designed to
(vi) Hot repairs shall not be made in a buildings, there shall be no opening in
safely meet the requirement! of the
room where there are other generators any of the mutually exposing sides of
service. Chief among these conditions
unless all the generators and piping
such buildings within 10 feet (3 m). If the are:
have been purged of acetylene.
' storage building is of combustible
(A) Exposure to unusually corrosive
(g) Calcium carbide storage--{1)
construction, it shall be at least 20 feet fumes.
Packaging, (i) Calcium carbide shall be (6.1 m) from any other one- or two-story
(B) Exposure to steam or excessive
contained in metal packages of .
building, and at least 30 feet (9.1 m) from humidity.
sufficient strength to prevent rupture. The packages shall be provided with a screw top or equivalent. These packages shall be constructed water- and air-tight. Solder shall not be used in such a manner that the package would fail if exposed to fire.
(ii) Packages containing calcium carbide shall be conspicuously marked "Calcium Carbide--Dangerous if Not Kept Dry" or with equivalent warning.
(iii) Caution: Metal tools, even the socalled spark resistant type may cause ignition of an acetylene and air mixture when opening carbide containers.
(iv) Sprinkler systems shall not be installed In carbide storage rooms.
(2) Storage indoors. (1) Calcium carbide in quantities not to exceed GOO pounds (Z712 kg) may be stored indoors
any other building exceeding two stories.
(3) Storage outdoors, (i) Caldum carbide in unopened metid containers may be stored outdoors.
(ii) Carbide containers to be stored
outdoors shall be examined to moke sure that they are in good condition.
Periodic reexaminations shall be made for rusting or other damage to a container that might affect its water or air tightness.
(iii) The bottom tier of each row shall
be placed on wooden planking or equivalent, so that the containers will
not come in contact with the ground or ground water.
(iv) Containers of carbide which have been in storage the longest shail be used first.
(C) Exposure to excessive oil vapor. (D) Exposure to flammable gases. (E) Exposure to abnormal vibration or
ihodc. (F) Exposure to excessive dost
(G) Exposure to weather. (H) Exposure to unusual seacoast or shipboard conditions. (3) Voltage. The following limits shall not be exceeded: (i) Alternating-current machines (A) Manual arc welding and cutting--
80 volts. (B) Automatic (machine or
mechanized) arc welding and cutting-- 100 volts.
(ii) Direct-current machines (A) Manual arc welding and cutting100 volts. (B) Automatic (machine or
in dry. waterproof, and well-ventilated locations.
(A) Calcium carbide not exceeding GOO pounds (272.2 kg) may be stored indoors in the same room with fuel-gas cylinders.
(B) Peeke ges of calcium carbide, except for one of each size, shall be kept sealed. The seals shall not be broken when there is carbide in excess of 1 pound (0J kg) in any other unsealed package of the same size of carbide In the room.
[ii] Calcium carbide exceeding GOO pounds (272.2 kg) but not exceeding 5.C00 pounds (2.258 kg) shall be stored:
(A) In accordance with paragraph (g)(2)(iii) of this section;
(B) In an inside generator room or outside generator house: or
(C) In a separate room in a one-story building which may contain other occupancies, but without cellar or basement beneath the carbide storage
section. Such rooms shail be constructed in accordance with paragraphs (f)(6)(i)(H) and (r)(e)(i)(I) of this section and ventilated in accordance with
paragraph (0[6)(ii) of this section. These rooms shall be used for no other purpose.
f 1910.254 Are welding and cutting.
mechanized) arc welding and cutting-100
(a) General--(1) Equipment selection. , volts.
Welding equipment shall be chosen for
(iii) When special welding and cutting
safe application to the work to be done as specified in paragraph (b) of this
processes require values of open circuit ` voltages higher than the above, means
section. (2) Installation. Welding equipment
shall be provided to prevent the operator from making accidental contact
shail be installed safely as specified by with the high voltage by adequete
paragraph (c) of this section.
insulation or other means.
(3) Instruction. Workmen designated
(iv) For ax. welding under wet
to operete ere welding equipment shall conditions or warm surroundings where
have been properly instructed and
perspiration is a factor, the use of
qualified to operate such equipment as reliable automatic controls for reducing
specified in paragraph (d) of this
no load voltage ia recommended to
section.
reduce the shock hazard.
(b) Application ofarc welding
(4) Design, (i) A controller integrally
equipment--(1) General. Assurance of mounted in an electric motor driven
consideration of safety in design is
welder shail have capacity for carrying
obtainable by choosing apparatus
rated motor current, shail be capable of
complying with the Requirements for
making and interrupting stalled rotor
Electric Arc-Welding Apparatus. NEMA current of the motor, and may serve as
EW.4-.19B2. National Electrical
the running overcurrent device if
Manufacturers Association or the Safety provided with the number of overcurrcnt
Standard for Transformer-Type Arc-
units as specified by Subpart S of this
Welding Machines. ANSI C232--1958. part.
Underwriters' Laboratories. .
(ii) On all types of arc welding
(2) Environmental conditions. (1)
machines, control apparatus shall be
Standard machines for are welding
enclosed except for the operating
service shall be designed and
wheels, levers, or handles.
constructed to carry their rated load
(iii) Input power terminals, tsp change
with rated temperature rises where the devices and live metal parts connected
" D0 A OA4474 confidential
13710 Federal Register / Vol. 55. No. 70 / Wednesday. April 11. 1990 / Rules and Regulations
r r
i
to input circuits shall be completely
(3) Supply connections and
freed from adherent metal particles of
enclosed and accessible only by means conductors. (1) A disconnecting twitch spatter on contact surfaces. Coiled
of tools.
or controller shell be provided at or near welding cable shall be spread out before
(!v) Terminals for welding leads
each welding machine which ia not
use to avoid serious overheating and
should be protected from accidents!
equipped with such a twitch or
damage to insulation.
electrical contact by personnel or by
controller mounted as an integral part of (3) Grounding. Grounding of the
metal objects, i.e_ vehicles, crane hooka, the machine. The switch shell be in
welding machine frame shall be
etc. Protection may be obtained by use of: Dead-front receptacles for plug
accordance with aubpart S of this pert Overcurrent protection shall be
checked. Special attention shall be given to safety ground connections of portable
connections: recessed openings with
provided ss specified in subpart S of
machines.
nonremovable hinged covers: heavy insulating sleeving or taping or other equivalent electrical and mechanical
protection, if a welding lead terminal
which ia intended to be used exclusively
for connection to the work is connected
to the grounded enclosure, it must be
done by a conductor at least two AWG sizes smaller than the grounding conductor and the terminal shall be marked to Indicate that it la grounded.
(v) No connections for portable control devices such as push buttons to
be carried by the operator shall be connected to an ax. circuit of higher than 120 volts. Exposed metal parts of
portable control devices operating on circuits above 50 volts shall be grounded
by a grounding conductor in the control cable.
(vi) Auto transformers or ax. reactors shall not be used to draw welding
current directly from any a.c. power source having a voltaga exceeding 60 volts.
(c) Installation of arc voiding equipment--(1) CeneraL Installation including power supply shell be in accordance with the requirements of Subpart S of this part.
(2) Grounding, (i) The frame or case of the welding machine (except enginedriven machines) shall be grounded under the conditions and according to tha methods prescribed in Subpart S of this part.
tii) Conduits containing electrical conauctors shall not be used tor completing a work-lead circuit. Pipelines shall not be used es a permanent pan of a work-lead circuit, but may be used during construction, extension or repair
providing current is not earned through threaded joints, flanged bolted foists, or caulked joints and that special
precautions ire used to avoid sparking si connection of the work-lead cabla.
tiii) Chains, wire ropes, cranes, holds, and elevators shall not be used to carry welding current.
(iv| Where a structure. conveyor, or fixture is regularly employed as a weldms current return circuit. |omis hall be bonded or provided with adequate current collecting devices.
(v| Ail ground connections shati be
checked to determine that they are mecnamcelly strong and electrically
adequate (or iha required current.
this part A disconnect switch with
overload protection or equivalent disconnect and protection means,
permitted by subpart S of this part shall
be provided for each outlet intended for
connection to a portable welding
machine. (ii] For individual welding machines,
the rated current-carrying capacity of
the supply conductors shall be not lest
than the rated primary current of the
welding machines. (tii) For groupa of welding machines,
the rated current-carrying capacity of
conductors may be less than the sum of the rated primary currants of the welding machines supplied. The
conductor rating shall be determined in
each case according to the machine
loading bated on the use to be made of each welding machine and the allowance permissible in the event that all the welding machines supplied by the
conductors will not be in use at the same time.
(lv) In operations involving several welders on one structure, dx. welding process requirements may require the use of both polarities; or supply circuit limitations for a.c. welding may require distribution of machines among the phases of the supply circuit. In such. cases no load voltages between electrode holders will be 2 times normal In dx. or 1.1.41. IJX or 2 times normal oo ax. machines. Similar voltaga differences will exist If both ax. and dx. welding are dons on the same structure.
(A) All dx. machines shall be
connected with the same polarity. (B) All ax. machines shall be
connected to the same phase of the supply circuit and with the same instantaneous polarity.
(d) Operation and maintenance--{1)
General. Workmen assigned to operate or maintain arc welding equipment shall be acquainted with the requirements of this section and with f 1BKL2S2 (a j. (b) and (cl of this pare if doing gse-shielded arc welding, aiao Recommended Safe Practice* (or Cea-Shielded Arc Welding,
A&.1-1S60. American Welding Society. (2) Machine hook up. Before starting
operations all connections to the machine shall be checked to make
certain they ere properly mads. The wont lead shall be firmly attached to the
work: magnetic work clampa shall ba
(4) Leaks. There shall be no leaks of cooling water, shielding gas or engine fueL
(5) Switches. It shall be determined that proper switching equipment for shutting down the machine is provided.
(6) Manufacturers' instructions. Printed rules and instructions covering operation of equipment supplied by the manufacturers shall be strictly followed.
(7) Electrode holders. Electrode holders when not in use shall be so placed that they cannot moke electrical contact with persons, conducting objects, fuel at compressed gas tanks.
(8) Electric shock. Cables with splices within 10 feet (3 m) of the holder snail not be used. The welder should not coil or loop welding electrode cable around parta of his body.
(9) Maintenance, (i) The operator should report any equipment defect or safety hazard to hit supervisor and the use of the equipment shall be discontinued until its safety hat been atlured. Repairs shall be made oniy by qualified personnel.
(ii) Machines which have become wet shall be thoroughly dried and tested before being used.
(iii) Cables with damaged insulation or exposed bare conductor* shall be replaced, joining lengths of work and electrode cable* shall ba dooe by the use of connecting means specifically intended for the purpose- The connecting means shall have insulation adequate for ths sennet conditions.
11V1IL2SS Rewlstanco wtdSi*.
(a)General--(1) Installation. All equipment shall ba installed by a qualified electrician m conformance with subpsrt S of this part. There shall be a safety-type disconnecting switch or a circuit breaker or circuit interrupter to open each power circuit to the machine, conveniently located at or near the machine, so that the power can be shut off when the machine or its controls are to ba serviced.
(2) Thermal protection. Igmtron tubes used in resistance wilding equipment shall b* equipped with a thermal pro(eelion switch.
(3) Personnel. Workmen designated to
operate resistance welding equipment
shall have been properly instructed and
DO A 044475 CONFIDENTIAL
Federal Register / Vol. 55, No. 70 / Wednesday, April 11. 1990 / Rules and Regulations 13711
judged competent to operate such equipment.
(4) Guarding. Controls of all automatic or air and hydraulic clamps shall be arranged or guarded to prevent the
operator from accidentally activating them.
(b) Spat and seam welding machines (nonportable}--(1) Voltage. All external
weld initiating control circuits shall operate on low voltage, not over 120 volts, for the safety of the operators.
(2) Capacitor welding. Stored energy or capacitor discharge type of resistance welding equipment and control panels involving high voltage (over 550 volts) shall be suitably insulated and protected by complete enclosures, all doors of which shall be provided with suitable interlocks and contacts wired into the control circuit (similar to elevator
interlocks). Such interlocks or contacts shall be to designed as to effectively interrupt power and short circuit all
capacitors when the door or panel is open. A manually operated switch or suitable positive device shall be installed, in addition to the mechanical
interlocks or contacts, as an added safety measure assuring absolute discharge of all capacitors.
(3) Interlocks. All doors and access panels of all resistance welding machines and control panels shall be kept locked and interlocked to prevent
access, by unauthorized persons, to live portions of the equipment.
(4) Guarding. All press welding machine operations, where there is a possibility of the operator's fingers being under the point of operation, shall be effectively guarded by the use of a device such as an electronic eye safety circuit, two hand controls or protection similar to that prescribed for punch press operation. { 1910.217 of this part. All chains, gears, operating bus linkage, and belts shall be protected by adequate guards, in accordance with { 1910.219 of this part
(5) Shields. The hazard of flying sparks shall be. wherever practical, eliminated by installing a shield guard of safety glass or suitable fire-resistant plastic at the point of operation. Additional shields or curtains thsll be installed as necessary to protect passing persons from flying sparks. (See i 19lO^S2(b)(2)(i)(C) of this part)
(6) Foot switches. All foot switches
shall be guarded to prevent accidental operation of the machine.
(7) Stop buttons. Two or more safety emergency stop buttons shall be provided on sll special multispot welding machines, including 2-post and 4-post weld presses.
(8) Sofetypins. On large machines, four safety pins with plugs and
receptacles (one in each comer) shall be provided so that when safety pins are
removed and inserted in the ram or platen, the press becomes inoperative.
(9) Grounding. Where technically practical, the secondary of ail welding transformers used in multispot,
projection and seam welding machines
shall be grounded. Thia may be done by permanently grounding one side of the welding secondary current circuit. Where not technically practical, a center tapped grounding reactor connected across the secondary or the use of a safety disconnect switch in conjunction with the welding control are acceptable
alternates. Safety diaconnect shall be arranged to open both sides of the Use when welding current is not present.
(c) Portable welding machines--(1)
Counterbalance. All portable welding guns shall have suitable counterbalanced devices for supporting the guns, including cables, unless the design of the gun or fixture makes counterbalancing impractical or unnecessary.
(2) Safety chains. All portable welding guns, transformers and related equipment that is suspended from overhead structures, eye beams,
trolleys. eta. shad be equipped with
safety chains or cables. Safety chains or cables shall be capable of supporting the
total shock load in the event of failure of any component of the supporting
system. (3) Clevis. Each clevis shad be
capable of supporting the total shock load of the suspended equipment in the event of trolley failure.
(4) Switch guards. All initiating switches, including retraction and dual schedule switches, located on the portable welding gun shad be equipped with suitable guards capable of preventing accidental initiation through contact with flxturing. operator's clothing, eta Initiating switch voltage shad not exceed 24 volts.
(5) Moving holder. The movable holder, where it enters the gun frame, had have sufficient clearance to prevent the shearing of fingers carelessly placed on the operating movable holder.
(Q) Craunding. The secondary and case of all portable welding transformers shall be grounded. Secondary grounding may be by center tapped secondary or by a center topped grounding reactor connected across the secondary.
(d) Flash welding equipment--(1)
Ventilation and flash guard. Flash welding machines shall be equipped with a hood to control flying flash. In
cases of high production, where materials may contain a film of oil and
where toxic elements and metal fumes are given off. ventilation shall be provided in accordance with J 1910252(C) of this part.
(2) Fire curtains. For the protection of the operators of nearby equipment, fireresistant curtains or suitable shields shall be set up sround the machine and in such a manner that the operators movements are not hampered.
(e) Maintenance. Periodic inspection shall be made by qualified maintenance personnel, and a certification record maintained. The certification record shall include the date of inspection, the signature of the person who performed the inspection and the serial number, or other identifier, for the equipment inspected. The operator shall be instructed to report any equipment defects to his supervisor and the use of the equipment shall be discontinued until safety repairs have been completed.
J 1910054 Sources of standard*.
Sant
ANSI 2x9.1--1907. Safety in Wetdinq and Cuonp
19102S2-ZS5----- (a) hfpx--si-ieea. wattnq and Qmng Otrypan Fuat Gaa System.
(bl ANSI Z-4SL1-19S7, Salary In wetang and Curanq.
(C) NFP*--618-1962. Cutting me waking Preoesaea.
<d) 41 CFR 50-204.7.
} IS10.257 Standard* orpantaation*. -
Specific standards of the following organizations have been referenced m this subpart. Copies of the referenced standards may be obtained from the issuing organizations. The names and addresses of the isauing organizations are as follows;
(a) American National Standards Institute (ANSI), 1430 Broadway. New York. NY 10018.
(b) National Fire Protection Association. Batterymareh Park. Quincy, MA 02289.
(c) Compressed Cas Association. Ina, 1235 Jefferson Davis Highway, Arlington. VA 22207.
(d) American Petroleum Institute, 1220 L Street NW,, Washington. DC 20005.
(e) American Welding Society. 550 N W. Leleune Road. P.O. Box 351040. Miami. FL 33135.
(0 Rubber Manufacturers Association. 1400 K Street NW,, Washington. OC 20005. |FR Doc. 90-7799 Filed 4-t0-9tt B:45 m|
mim coot
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