Document Eq36mKoZO8bmExqpJMeG55aQx

12694 Federal KegUter / Vol. 55, No. 70 / Wednesday, April 11. 1990 / Rules and Regulations DEPARTMENT OF LABOR - OSHA'a attempts to prepare a notice and an opportunity for continent proposed revision to the current welding' la not required. Occupational Safety and Health Administration standard have been hindered by the standard's great length and ineffective IQ. Other Changes 29 CFR Part 1910 - organization. Because of the standard's length and complexity. It is difficult to In addition to the reorganization and renumbering, certain other minor, non* Safety and Health Standards; Welding, Cutting and Brazing 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 agency; Occupational Safety and Health Administration (OSHA), U.S. complexity make it difficult to understand, and comply with, the measurements were formerly given only In non*metric units: (2) changes to reflect Department of Labor. standard*! provisions. The current the transfer of functions among Federal action: Final rule: Redesignation and other non-substantive revisions.* I. standard's organization, with paragraphs dealing with specific processes, such as oxy-fuel and arc agencies; (3) the deletion of six formerly "reserved" provisions; (4) the deletion of one non*iubstantive provision adopted summary; The Occupational Safety and welding, located ahead of more general In error (5) the correction of one Health Administration (OSHA) is provisions, such as those for ventilation provision's erroneous internal reference: reorganizing its existing part 1910 end fire protection, presents a problem and (6) the updating of the mailing Standards pertaining to Welding. that needs to be corrected. Instead of addresses of the organizations that Cutting and Brazing as a first step in an effort to revise these standards comprehensively. The existing standard is long and not well organized with paragraphs covering specific operations, such as arc welding, 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 alto 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 unite. effective OATE This action will be effective on May 11.199a 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 will not be corrected in this document. decided to proceed In two phases. This On November 3a 1987, a* part of the action will address the problem* of Electrical Safety-Related Work Practices organization and complexity, while notice of proposed rulemaking, existing future rulemaking will address the ( 1910-252(a)(B)(iv)(<fi(2), was listed as substantive revision of the standard's provisions. one of several OSHA general industry standards that contain inaccurate IL Benefits of Reorganization references to OSHA't electrical . standards (52 FR 45530.45541). OSHA OSHA believes that the proposed at that time to correct the reorganization will be very beneficial. reference (Id. at 45545). Although this Most importantly, the creation of a more - welding provision will be redesignated logical format and the renumbering of as | i9i0253(f)(4)(iv)(B). as a result of the standard will make it easier for both the reorganization announced in today's the public and OSHA to use. The Federal Register publication, any FOR FURTHER INFORMATION CONTACT; provisions having a more general amendments to the provision's reference Mr. lames F. Foster, Office of application will now be located at the to the electrical standards will be made Information end Consumer Affairs, beginning of the standard where they as a result of the electrical safety Occupational Safety end Health can be more easily located. Also, rulemaking. Administration. U.S. Department of Labor. Room N3487,200 Constitution ' because the current 11910.252 will be converted into four sections (1910.252- 1. Addition ofMetric Units Ave. NW,, Washington. DC 20210, (202) 1910.255), all its provisions will become The existing welding, cutting and 523-8151. This reorganization document much more accessible. In addition, the brazing standard contains many was prepared by Wendell Glasier. standards will follow the Office of the measurements, such as those for weight, Directorate of Safety Standards Programs. Federal Register's guidelines for proper length, volume, pressure and paragraph numbering and cross* temperature. No metric equivalents were SUPPLEMENTARY INFORMATION; referencing. OSHA also anticipates that provided for any of these measurements. I. Background this action will facilitate the Agency's planned substantive revision of the Since the policy of the Federal Government is now to provide metric The existing OSHA standard covering welding standard by eliminating the units whenever feasible, equivalent safety in Welding, Cutting and Brazing problems of reorganization and . , . metric units have been added to each of (29 CFR 1910.252) was promulgated in renumbering, which otherwise would - these measurements. 1971, under the authority of section 6(a) of the Occupational Safety and Health Act of 1970. Except for minor deletions, have to be addressed In that rulemaking. The phase two proposed revision will be accomplished through rulemaking . Z Change to Reflect Transfer of Authority Between Federal Agencies no changes have been made to the procedures which will provide The existing welding standard standard since that time. Changes in appropriate public notice and contains several references in welding technology, welding practices opportunity for commenL i 1910.252(0t0 UX. Bureau of Mines end in the National Consensus OSHA withes to emphasize that this as the approving authority for Standards on which the rule wee based action does not alter the substance of respiratory protective equipment The have ail occuned since 1971. The OSHA the present welding, cutting and brazing current authority for the approval of welding standard requires updating to standards in any way. nor does it affect such devices lies with the Mine Safety reflect current technology and practices in the industry, and to provide consistency with current industry standards. their present scope and application. Because there ere no substantive amendment* to OSHA'a standards in this action, providing the public prior and Health Administration (MSHA) of the U.S. Department of Labor, and with the National Institute for Occupational Safety and Health (NIOSH) (See 30 CFR Federal Register / Vol. 55. No. 70 / Wednesday, April 11. 1990 / Rules and Regulations 13695 - part II). Consequently, reference* pertaining to the approval of respiratory protection devices have been changed to reflect the transfer of authority. 3. Deletion ofReserved.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 Ceneral and Special Industry Safety and Health Standards" (43 FR 49728) or by the 1984 "Revocation of Advisory and Repetitive Standards" (49 FR 5318). 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 conectjmgierical or alphabetical sequencsifThe "reserved" provisions which msbeing removed are listed below; l910232(JflSiw() 1910.252(cpr 1910.Z32fd)f2|(li)(/) 1928232(f)(l](ii) 4. Deletion ofNonsubstantive Provisio^_ Paragraph(a)(3)(v)(6) of existing S 1910.252`cOhiainj no substantive requirements other than requiring compiiaR&"With "subdivision (/)" of S 1910.25j)^S{J)(v). However, there is no subdivif&jgXgr);- Since this provision neitheripfrains nor references substantWrequirements, it is being deletedrT&e provisions which follow the deleted-provision have been redesignatqdJo. maintain the correct numencabsequence. 3. Correction of Internal Reference Paragraph (a)(2)(vi)(o)(J) of existing ! 1910252 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 (s)(6)(vi)(a)(8). This action corrects the erroneous reference, which, after reorganization, appears as paragraph (f)(6)(i)(H) of 1910253 (see conversion table).' 6. Updating ofAddresses ofSource Standards Organizations.. The standards organizations listed in existing i 1910.254 contained, except for the American National Standards Institute, outdated addresses. The ' addresses have been updated in redesignated S 1910.257. For convenience of reference. OSHA has prepared the following conversion table which lists all the "old" provisions in subpart Q and. alongside each, the equivalent "new" provision. Welding. Cutting and Brazing Conversion Table--Part 1810. Subpart Q Old Provision* Now Provision* 11810-251--------------------- | moist Definitions Definitions (No chansas) O/d Provisions 11810252. now Provisions , nmozss Welding, cutting, and brazing (aWKIHWl<a)CI(iMHdl(a|(ZI(UHoHd). (aH2l(lii)_ (a)U)(UiHoHA>tamivttoHdl(a|(2llKol(aM2HvgiKiWfl -- (a|(Z|(vH6|(r<HiH)(K2!(v)(eKrWr2|-- HH3)0KH*1---------(aXSKIIMeH/)--------(aHSIHiiltsHs)-------(a)(3)(lvMaMA)-------(iHDIvHoHA)--------UlUIOHoXfl. tsmimvaHWUK4MIHXJ|---------(WHtKAKJHJ)-- ()(|(lKeKlHZ)-- (a)HHKoHe|------(aMSXHlXoM/)------(aK)(WKoWe|-----la)(4Hv)(oWA|------(a)(SI(lHii|----------(allSHiiiXoHAI(aXSXWIlAXlWJI----(a||51(iilllti)(J)(iHiV)(a|(s|(.iiKcHdI--------(a|(SHl*KeH/--------(aMSMvMoH/)---------|.|(5l(viKoHd)--------tal(Sl(IMoH6l---------(aXei(UltoHc)--------(a|(](lli)_ (.|(SKM(o|UH51- (Ha|(lHbHHJt- (aUSHWKeHiHat- laHSKvXoXrHrt- (.|(#|(|(41(/Kin- (.|(|(*i|(oHJHei(al(XiXAWe)-- (allSItviXdMiHTl. (iHei(vi)M--------- (aXSHvtntn)- (|(S)(vnMeMHO|a|(XvUM6H/1 -- taH7|(il(Md)----laltritlMtol(iimdflO(rHJ)UX7|(ii|(A|------(a|(7XiiH6KrH2|- (a||ri(iiXe|. (anrXiiiHnHs)------- Old Provisions 11810252_________ Oxygstbfuolgoo welding and cutting . (SX1W4) . (bKlKiWW! tb|!2|(iHlv) (bKSI (bKSXIHil) . (bK4X<Hlv) (bXSHU . tbXSXUMAHQI . (bK5KUXRXiH2) . (bltsidUKAHU . leXHUHvI (cXiKIHvtr . tcXJXIHl . (c)(4KiHviU1 . (ellSKtHvi)* * . (d)(l)(tXA) . (dXIXIXAXrHZ) . IdXlXiHBI . (dHIXUHAHO . (dXIHUlHAHO) . (dllZKIHilt) . (d)(3)(IH*t . (dXWHHil - IdXSKiHU) - taMlHH - (a)(3)0HU) . UHSMllXAHCJ . (eHH(ii|(C|(JW4) . (cH3XUiHiv| - (a|(4XiHviil) . (aXSMtHv)* - taitsMlHlvl - tntixiwin - int2KiHiii) - (0(3) - tnt4)m(AHEi - tnt4NIIXAMC| . (OMHUiMAHH - ini4||lvMAHE) - (Q(5KI)(AHD| - (n(5l(ll|(AHE| - tnieXiKAHt) - tntSHUHUil _ (O(SXlvXAHB) - tmsxvi - tnmtn - lOmOHAHD) - lOI7|(H*i) - tsimtiHi*) - (Sltzlti) - (gXZItiKAMB] - lS)(2)|ii) - (SlUXUHAHC) - lg)(2|(iii) - IgllWHivI* New Provisions 1 11810-254 Welding, cutting, and. . /ire welding and cutting bmztng (blliniHiill------- i-----(a)(1)--(3) (bM2xn-------------------- (bill) (hHZUUllAu IbMliiliKAHM) jtlllj................ (bllliO) .. fhllZKiifAWBl (bU2)0iiH6K/H^)-----------(bHJUiiHAMB) Ibl(2mu1lr^^ IbHSUliil--livl (bM2l(lvlr^-<A fblUMWvil (cHII ( ibittiimiiwu tuizi (dHlHIj (bK4Ml*koHe----------- waskiHiii) Old Provisions 11710252. Now Provisions 11910255 Wtldlng. cutting, and bracing Assistance welding JeXlXIWIv)------------------ (aH1M4) (cKZXIHte)------------------- (bMlHl (cXSNiHvi)------------------ (eUiHst (CX4X1HH)-------------------- tdXlHD (cKSH)---------------------- W Old Provisions 11810252-------------- Welding, cutting, end brazing MITO- (dXIHIHUil(d)(2). (dKZXiHm(dH2UUiXU (dlUHiilHotUHO(dH2)(tli)(b)--------(d)(3XlvHvt)------- (dl(2XYt)(oHdi- (d)(2)(v1IWUlll(d)(2l(*Ull(oHd)_ (d)(2l(xiv|------------ (d)(2l(iiv|(oHc)----(d)(I|()dvMc)(JHJ}. (d)(2)(*lvXdH/1-- (d) (2|(*v)----------- (dXSKIHil)----------(d|(4|(iHii)----------leHWHW----------(e) |2)(l)(oHd)----(*|(2](li)(oH0:-----(H2KU1)-------------(aK3X`)---------------- (*l(4HIHvtl|. (0(1)01- mmOKoHel- (OOlOiHvI-- tntll(KoMe). (0(210). WMWaHcl(0(2)01)------- (0(31. (0(3)01-01)(0(4I(IH*(O(SKIHU)- (OloiOWiii- 10(7)0Hiii- (0(S1- (0(SIOHU1~ (Odoi--------(OdilOHiil(0(12Ht3l-- (iimoHiii(sl(2|0Hii|- Now Provisions 11910131 Constat requirements (aXU (aXlKlHiii) . (a MU . (aX2|0WU) . (aX2|01IMA) . laimtlUMAKlHfl . (aH21(lil)(B) . (aX2XWH) . (aXZX'dHAHD) . (aXZKrtiHaiiil . (aXZXsiUKAHD) . (aX2M*lv| . (a)(3X*i)(AMa . (aX3ll*lYXC)(JH3i . (aM2||*iYXDHCi (al(ZIIXY) . (a)(3)0Hli) . (aM4)0Hii) . (bimOHii) . [b)|2)0XAHD( . (b)(2((li)(AMI)` . (bXIHUil ^ . (b)(3) (0) dallied. . bceauaa no (ii)J . (b|(4XiH*ii) . IclmiD . . (eMHOI(AHC) (cXlllUHlvr . (cHl)dvHAHC) (c|(2IO) . (el(2)01(AHC) (cl(2)(U) . (cl(3| (c)(3)0Hii) . (e)I4)0HY) . (cKSIOMii) (cllSIOHiil (cliriOHui) (0(1) (cHSIOHii) . (cXlOl . (cimiown) . |el(12Ml3| . IdlMldH*1*I) . (d|(2IOHii) ( O/d Provisions 11810-253.... Nsw Provisions . | 1810-250 Sourer* of standards Source* ofstandards Old Provisions Nsw Provisions I 1810.254------------------- . | 1810.237 DO A 038454 CONFTDFNTTAl 13SS6 Federal Register / Vol. 55. No. "0 / Wednesday. April 11. 1990 / Rules and Regulations OSHA also finds that in accordance Subpart Q--Welding, Cutting anti Standard* orsaauationa Standard* or^anitadon* (`I fhl -------------- (a) iKi lei. Ml... 1*1... m ---------------if) with 29 CFR 1911.5. good cause exists for dispensing with the public notice and comment procedures prescribed in section 6(b) of the Occupational Safety and Health Act VI. List of Subjects Brazing' ' 11910251 Definition*. Aa uaeri In this subpart (a) Welder and welding operator mean any operator of electric or gas welding and cutting equipment ' Prwision* currently Kited "Rnerved" In 23 CFR pin 1910. labpin Q. lie beiny deleted. '* Eusline puunM (*H3||vHa| it beinf deleted beeeute it contain! no substantive require* menti end nleiu to e praenicn which dace not etuiL List of Subjects In 29 CFR Part 1910 Asbestos. Chemicals. Diving. Electric power. Electronic products. Fire prevention. Cases. Hazardous (b) Approved means listed or approved by a nationally recognized testing laboratory. Refer to 11910.155(e)(3) for definition* of listed and approved, and f 19102 for IV. Regulatory Impact Assessment substances. Health records. Incorporation by reference. Labeling. nationally recognized testing laboratory. (c) All other welding terns are used in OSHA finds that this action consists solely q{ 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 requires preparation of a regulatory impact analysis pursuant to Executive Order No. 12291. For the same reason, OSHA further certifies that this action will not have significant economic impact on a substantial number of small entities and. therefore, there is no need to prepare a 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 Notice and Comment Procedures With regard to thia action. OSHA has determined that it it not required to follow procedure! for public notice and comment rulemaking under either section 4 of the Administrative Procedure Act ($ U-S.C 553) or under section 6(b) of the Occupational Safety and Health Act (a U.S.C. 655(b)). This Laboratories, Noise control. Occupational safety and health. Radiation protection. Reporting and recordkeeping requirements. Signs and symbol*. VIL Authority This document was prepared under the direction of Gerard F. ScannelL Assistant Secretary of Labor for Occupational Safety and Health. U.S. Department of Labor, 200 Constitution Avenue NW- Washington, DC 20210. Accordingly, pursuant to sections 4,6. and 8 of the Occupational Safety and Health Act of 1970 (29 U.S.C. 653,655. 657). 5 U.S.C. 553, Secretary of Labor's Order No. 1-90 (55 FR 9033). and 29 CFR part 1911. subpsrt Q of part 1910 of 29 CFR la revised to read as set forth below. Signed at Washington. DC, this 30th day at March, ima Girmrd f. ScennalL A**i*tant Saaetary ofLobari PART 191O-OCCUPAT10NAL SAFETY AND HEALTH STANDARDS The authority citation tor subpart Q of part 1910 is revised to read: Authority: Sea. 4, 8, a, OccupaUonal Safety and Health Act ol 1970 (29 US.C 653.655. 6S7k Secretary of Labor * Order No. 12-71 (38 FR 8754L 6-76 (41 FR 25059). B-83 (46 FR 557381. or 1-90 (55 FR 9033). a* applicable: S US.C 533; 23 CFR part 1911. 2. Part 1910 Is amended by revising subpart Q to read as follows: accordance with American Welding Society--Term* and Definitions--A1.0-- 969. 11910252 General requirement*. (a) Fire prevention andprotection-- (1) Basic precautions. For elaboration of these basic precautions and of the special precautions of paragraph (a)(2) of thia section ee well as a delineation of the fire protection and prevention responsibilities of welders end cutters, 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 51B. 1962. The basic precautions for fire prevention in welding or cutting work are: (1) Fire hazards. If the objeet tn be welded or cut cannot readily be moved.' all movable fire hazards in the vicinity shall be taken to e safe place. (U) Guards. If the object to be welded or cut cannot be moved and if all the fire hazard* cannot be removed, then guards shall be used to confine the heat sparks, and slag, and to protect the immovable fire hazards. (iii)Restrictions. If the requirements stated in paragraphs (s)(1](i) and (a)(l)(ii) of this section cannot be followed then welding and cutting shall not be performed. (2) Special precautions. When the neture of the work to be performed falls within the scope of paragraph (a)(lKii) of this section certain additional precaution* may be necessary: action involves e reorganization of existing standards and other minor changes which do not affect the Subpsrt Q--Welding, Cutting and Brszlng (i) Combustible material. Wherever there are floor opening* or cracks in the flooring that cannot be dosed, substantive requirements or coverage of the standards themselves. This acnon 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 reasons. Sic 1910-251 Definitions. 1910.252 Ceneral requirement!. 1910-253 Oiyjrn-fuel gat welding and cutting. 1910.254 Arc welding end cutting. 1910255 Resilience welding. 1910256 Source* of ttandarde. 1910257 Standards organisation*. precauuons shall be taken so that no readily combustible materials on the floor below will be exposed to sparks which might drop through the floor. The same precaution* shall be observed with regard to cracks or holes in wells, open doorweys and open or broken window*. (ii) Fire extinguishers. Suitable fire extinguishing equipment shall be DO OQhip- 45 TOFNt M/ 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) Fin 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 exist: (J) Appreciable combustible material, in building construction or contents, closer than 35 feet (107 m) to the point of operation. (7) Appreciable combustibles are more than 35 feet (107 m) away but are easily ignited by sparks. (3) Wall or floor openings within a 35foot (107 m) 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 futilities 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 shallbe 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 area shall be Inspected by the individual responsible for authorizing cutting and welding materials such as bulk sulfur, baled paper, or cotton. (vii) Relocation ofcombustibles. Where practicable, all combustibles shall be relocated at least 35 feet (10.7 m) from the work site. Where relocation is impracticable, combustibles shall be protected with flameproofed covers or otherwise shielded with metal or asbestos guards or curtains. (viii) Ducts. Ducts and conveyor systems that might cany sparks to distant combustibles shall be suitably protected or shut down. (lx) Combustible walls. Where cutting or welding is done near walla, partitions, ceiling or roof of combustible construction, fue-resistant shields or guards shall be provided to prevent ignition. (x) Noncombustible walls. If welding is to be done on a metal wall, partition, ceiling or roof, 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 from the work shall be provided. (xi) Combustible cover. Welding shall not be attempted on a metal partition, wall ceiling or roof having a combustible covering nor on walls or materials and hazardous areas present or likely to be present in the work location. (C) Shall protect combustibles from ignition by the following: (I) Have the work moved to a location free from dangerous combustibles. (7) If the work cannot be moved, have the combustibles moved to a 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) Shall 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 conditions ore safe before going ahead. (F) Shall determine that fire protectiop and extinguishing equipment are / properly located at the site. V. (G) Where fire watches are required/^ he shall see that they are available at the site. (xv) Fire pnvention 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 operations. He shaU designate partitions of combustible sandwich-type construction work, the area shall be precautions to be followed in granting panel construction. made safe by removing combustibles or authorization to proceed preferably in the form of a written permit (xii) Pipes. Cutting or welding on pipes or other metal in contact with protecting combustibles from ignition sources. (v) Floors. Where combustible combustible walla, partitions, ceilings or - (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 (10.7 m). Combustible (xiii) Management Management shall containers until they have been cleaned floors shall be kept wet covered with recognize its responsibility for the safe so thoroughly as to make absolutely damp sand, or protected by fire-resistant usage of cutting and welding equipment certain that them am no flammable shields. Where floors have been wet on its property and: materials present or any substances down, personnel operating arc welding (A) Based on fire potentials of plant such as greases, tars, acids, or other or cutting equipment shaU be protected facilities, establish areas for cutting and materials which when subjected to heat, from possible shock. welding, and establish procedures for might produce flammable or toxic (vi) Prohibited anas. Cutting or cutting and 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 (ii) Venting and purging. All hollow management. specifically designed for such processes. spaces, cavities or containers shall be (B) In spnnklered buildings while such (C) Insist that cutters or welders and vented to permit the escape of air or protection is impaired. their supervisors are suitably trained in gases before preheating, cutting or (C) In the presence of explosive the safe operation of their equipment welding. Purging with inert gas is atmospheres (mixtures of flammable and the safe use of the process. recommended. V V $ 13698 Federal Register / Vol. 55, No. 70 / Wednesday, April 11, 1990 / Rules and Regulations (4) Confined spaces--(i) Accidental (C) Helmets shall be provided with screens or shields or shall be required to contact When arc welding is to be filter plates and cover plates designed wear appropriate goggles. impended for any lubatantial period of for easy removal. (3) Protective clothing--General time, luch a* during lunch or overnight, (D) All parts shall be constructed of a requirements. Employees exposed to the all electrode* shall be removed from the material which will not readily corrode hazards created by welding, cutting, or holder* and the holder* 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 fogging of the lenses as much as accordance with the requirements of disconnected from the power source. practicable. 11910.132 of this part Appropriate (ii) Torch valve. In order to eliminate (F) All glass for lenses shall be protective clothing required for any the possibility of gas escaping through tempered, substantially free from striae, welding operation wilt vary with the leaks or improperly closed valves, when air bubbles, waves and other Haws. size, nature and location of the work to gas welding or cutting, the torch valves shall be closed and the gas supply to the torch positively shut off at 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. (b) Protection ofpersonnel--(1) General--(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 equipment so that it is dear of passageways, ladders, and stairways. (2) Eye protection--[i) Selection. (A) Helmets or hand shields shall be used during all arc welding or arc cutting operations, excluding submerged arc welding. Helpers or attendants shall be provided with proper eye protection. (B) Goggles or other suitable eye protection shall be used during all gas Except when a lens is ground to provide proper optical correction for defective vision, the front and rear surfaces of lenses and windows shall be smooth and parallel. (G) Lenses shall bear some permanent distinctive marking by which the source and shade may be readily identified. (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. WMng operation Shad* NO. ShtoWd nwtol me * Gss strawed sic (raiding (nontar- rousi--Vt*% His Hwidt aiao- Gaserraided are waiting (farrau*)--He. *-, U- ....... ..._____ _ mta Arc wtftfriq: """T* .. .................. . _ 10 It 12 12 14 1(M4 14 2 9 or 4 3 or 4 be performed. (4) Work in confined spaces--(i) General. As used herein confined space is intended to mean a relatively small or restricted space such as a tank, boiler, pressure vessel, or small compartment of a ship. (ii) Ventilation. Ventilation is a prerequisite to work In confined spaces. For ventilation requirements see paragraph (c) of this section. (ill) Securing cylinders and 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' securely blocked to prevent accidental movement. (iv) lifelines. Where a welder must enter a confined space through a manhole or other small opening, means shall be provided for quickly removing him in case of emergency. When safety belts and lifelines are used for this purpose they shall be so attached to the welder's body that his body cannot be welding or oxygen cutting operations. Spectacles without side shields, with 5 or A jammed in a small exit opening. An * attendant with a preplanned rescue suitable filter lenses are permitted for' use during gas welding operation* on Gas waiting (rnseun) 14 men to M meft-- Sera procedure shall be stationed outside to Gas waiting (heavy) M mch and mar Bora observe the welder at all times end be light work, for torch brazing or for inspection. Note: In pas waiting or ovygan cueing tw me capable of putting rescue operations into toren prMueas ftqn yaUow sgr*. a Oawati* r* effect. (C) All operators and attendants of resistance welding or resistance brazing use Inter a lane vial ao*an me yellow or tedium Venn* vim* hyx M eta opwenm. (v) Electrode removal When arc 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 goggles, 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 Z87.1-- shall be removed from the holders and eyes, as required. 1968--American National Standard the holders carefully located so that (D) 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 brazing operations not (ill) Protection from arc welding rays. source. covered in paragraphs (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. (ii)Specificationt forprotectors. (A) Helmets and hand shields shall be made of a material which is an insulator for should be enclosed in an individual booth painted with a finish of low reflectivity such as zinc oxide (an important factor for absorbing eliminate the possibility of gas escaping through leaks of improperly closed valves, when gas welding or cutting, the torch valves shall be closed and the heat and electricity. Helmets, shields and goggles shall be not readily flammable and shall be capable of withstanding sterilization. (0) Helmets and hand shields shall be arranged to protect the face, neck and ears from direct radiant energy from the arc. ultraviolet radiations) and lamp black, or shall be enclosed with noncombustible 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 noncombustible or flameproof fuel-gas and oxygen supply to the torch positively shut off at 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 038457 r.ONFTDFNTTAL Federal Register / Vol. 55, No. 70 / Wednesday, April 11, 1S9Q / Rules and Regulations 13699 (vii) Warning sign. After welding WARNING feet (30 m) per minute in the zone of operations sic completed, the welder shall mark the hot metal or provide some other means of warning other workers. (c) Health protection and CONTAINS CADMIUM--POISONOUS FUMES MAY BE FORMED ON HEATING Do not breathe fume*. Use only with adequate ventilation such aa fume collectora. exhauat ventilators. or air-supplied welding when the hood is et its most remote distance from the point of welding. The rates of ventilation required to accomplish this control velocity using a 3-inch (7.8 cm) wide ventilation--(1) General--(i) Contamination. The requirements In this paragraph have been established on the respirator*. See ANSI Z494 -1907. If cheat pam, cough, or faver develope after use cell phyaician immediately. flanged suction opening are shown in the following table: basis of tho following three factors in (C] Brazing and gaa welding fluxes ere and gas welding which govern the containing fluorine compounds shall amount of contamination to which have a cautionary wording to indicate welders may be exposed; that they contain fluorine compounds. (A) Dimensions of space in which welding is to be done (with special regard to height of ceiling). (B) Number of welders. (CJ Possible evolution of hazardous One such cautionary wording recommended by the American Welding Society for brazing and gaa welding fluxes reads as follows: CAUTION fumes, gases, or dust according to the CONTAINS FLUORIDES metals involved. This flex whan healed gives off fumee that (ii) Screens. When welding must be performed in a space entirely screened on all sides, the screens shall be so arranged that no serious restriction of ventilation exists. It Is desirable to have the screens so mounted that they are about 2 feet (0.81 m) above the floor unless 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. (Hi) Maximum allowable concentration. Local exhaust or general ventilating systems shall be provided and arranged to keep the amount of toxic fumes, gsses, or dusts below the maximum allowable concentration at specified in f 1910.1000 of this part. (iv) Precautionary labels. A number of potentially hazardous materials are employed in fluxes.-coatings, coverings, and fiUer metals used in welding "<t cutting or are released to the atmosphere during welding and cutting. These include but are not limited to the materials itemized in paragraphs (c)(5) through (c)(12) o( 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 granular materials shall carry the following notice, as a minimum, on tags, boxes, or other containers: may irritate eyes, nose and throat. i. Avoid fumes--use only in weli-veotileted spaces. Z. Avoid contact of flux with eyes or skin. 3. Do not tika internally. 'WVentilatioh forgeneral welding and cutting--(i) Gena/tiL Mechanical ventilation shall bo provided when welding or cutting is done on metals not covered in paragraphs (c)(5) through (c)(12) of this section. (For specific . materials, see the ventilation requirements of paragraphs (c)(5) through (c)(12) of this section.) (A) In a space of less than 10,000 cubic feet (284 m *} per welder. (B) In a room having a ceiling height of leaa than 10 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 ooss ventilation. (U) Minimum rate. Such ventilation shall be at the minimum rata of 2.000 cubic feet (57 m3) per minute per welder, except where local exhaust hoods and booths as 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 is considered sufficient for welding or cutting operations where the (ii) Fixedenclosure. A fixed enclosure with e top end not less than two sides which surround the welding or cutting operations and with a rata of airflow sufficient to maintain a velocity eway from the welder of not less than 100 linear feet (30 m) per minute. (4) Ventilation in confined spaces--(i) Airreplacement All welding and (cutting operations carried on in confined spaces shall be adequately ventilated to prevent the accumulation of Unde materials or possible oxygen deficiency. This applies not only to the welder but also to helpers end other personnel in the immediate vidnity. All sir replacing that withdrawn shall be clean end respirable. (H) Airline respirators. In such circumstances where it it impossible to provide such ventilation airline respirators or hose masks 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 this purpose, shall be used. (Ui) Self-contained units:. In areas immediately hazardous to life, hose masks with blowers or self-contained breathing equipment shall be used. The CAUTION Welding mey produce fumes end gases hazardous to heslth. Avoid breathing these fumes and gatea. Use adequate ventilation. See ANSI Z49.1 -197 Safety in Welding and Cutting published by the American Welding Society. (B) Brazing (welding) filler metals containing cadmium in significant amounts shall cany the following notice restrictions in paragraph (c)(2)(i) of this section are not present. (3) Local exhauat 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 as near aa practicable to the work being welded and provided with a rats of air flow sufficient to maintain a velocity in breathing equipment shall be approved by the Mine Safety and Health Administration and the National Institute for Occupational Safety and Health. (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 on tags, boxes, or other containers: the direction of the hood of 100 linear Mine Safety and Health Administration 00 A 0384F8 OONFTDFNTTAI 13700 Fedan! Register / Vol. 55, No. 70 / Wednesday, April 11; 1990 / Rules and Regulations and the National Institute for necessary by local exhaust ventilation operations-will 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 welding operation. In addition, of such confined spaces to insure the Indoors, outdoors, or in confined spaces trichloroethylene and perehlorethylene 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 gas-shielded welding operations. (5) Fluorine compounds--{l) General. respirators unless atmospheric 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 arc materials which contain fluorine is within the acceptable concentrations cutting of stainless steel, shall be done compounds shall be done in accordance defined by 11310.1000 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 welding or cutting operations (13) First-aid equipment. First-aid fluorine, as an element in chemical shall be protected as necessary by local equipment shall be available at all combination, not as a free gas. exhaust ventilation or airline times. All injuries shall be reported as (ii) Maximum allowable respirators. concentration The need for local (9) Cadmium--(i) General. Welding or exhaust ventilation or airline respirators cutting indoors or in confined spaces for welding or cutting in other than involving cadmium-bearing or cadmium- confined spaces will depend upon the coated bate metals shall be done using individual circumstances. However, local exhaust ventilation or airline experience has shown such protection to respirators unless atmospheric tests be desirable for fixed-location under the most adverse conditions have production welding and for all established that the workers' exposure production welding on stainless steels. is within the acceptable concentrations Where air samples taken at the welding defined by i 1910.1000 of this part. location indicate that the fluorides Outdoors such operations shall be done liberated are below the maximum using respiratory protective equipment allowable concentration, such such as fume respirators approved by protection is not necessary. the Mine Safety and Health (6) Zinc--(i) Confined spaces. In Administration and the National confined spaces welding or cutting Institute for Occupational Safety and involving zinc-bearing base or filler Health, pursuant to the provisions of 30 metals or metals coated with zinc- CFR part 11. for such purposes. bearing materials shall be done in (ii) Confined space. Welding (brazing) accordance with paragraph (c)(4) of this involving cadmium-bearing filler metals section. shall be done using ventilation as (ii) Indoors. Indoors, welding or prescribed in paragraph (c)(3) or (c)(4) of cutting involving zinc-bearing base or this section if the work is to be done in a filler metals coated with zinc-bearing confined space. materials shall be done in accordance (10) Mercury, Welding or cutting with paragraph (c)(3) of this section. - indoors or in a confined space involving (7) Lead--(i) Confined spaces. In metals coated with mercury-bearing confined spaces, welding involving lead- materials including paint, shall be done base metals (erroneously called lead- using local exhaust ventilation or airline burning) shall be done in accordance respirators unless atmospheric tests with paragraph (c)(4) of this section. (ii) Indoors. Indoors, welding under the most adverse conditions have established that the workers' exposure involving lead-base metals shall be done is within the acceptable concentrations in accordance with paragraph (c)(3) of this section. (iii) Local ventilation In confined defined by $ 1910.1000 of this part. Outdoors such operations shall be done using respiratory protective equipment 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. (U) Fieldshop 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 section and { {1910253 and 1910254 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 for Welding Pipe Lines and Related Facilities. API Std. 1104--1968. (vi) Flammable substance lines. The spaces or indoors, welding or cutting involving metals containing lead, other than as an impurity, or involving metals coated with lead-bearing materials, including paint shall be done using local 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. connection, by welding, of branches to pipelines carrying flammable substances shall be performed in accordance with Welding or Hot Tapping on Equipment Containing Ftammables. API Std. PSD exhaust ventilation or airline (11) Cleaning compounds--{i) No. 2201--1963. respirators. Outdoors such operations shall be done using respiratory Manufacturer's instructions. In the use of cleaning materials, because of their (vii) X-ray inspection. The use of Xrays and rad.oactive isotopes for the protective equipment approved by the possible toxicity or flammability, inspection of welded pipeline joints Mine Safety and Health Administration and the National Institute for Occupational Safety and Health, appropriate precauUons such as manufacturers instructions shall be followed. shall be carried out in conformance with the American National Standard Safety Standard for Non-Medical X-ray and pursuant to the provisions of 30 CFR (11) Degreasing. Degreasing and other Sealed Gamma-Ray Sources. ANSI part 11. for such purposes. In all cases, cleaning operations involving ZS4.1--1963. workers in the immediate vicinity of the chlorinated hydrocarbons shall be so (2) Mechanical piping systems--(i) cutting operation shall be protected as located that no vapors from these General. The requirements of no A Federal Register / VoL 55. No. 70 / Wednesday. April 11. 1990 / Rules and Regulations 137C1 paragraphs (a), (b). and (e) of this identifying the gas content with either when contained in metal containers section and ft 1810253 and 1910254 of the chemical or the trade name of the complying with paragraphs (gUl](U and this pan shall be observed. gas. Such marking shall be by means of (8)U)(ii) of this section.- | (ii) X-ray inspection. The use of X- stenciling, stamping, or labeling, and (ii) Acetylene cylinders shall be rays and radioactive isotopes for the shall not be readily removable. stored valve end up. inspection of welded piping Joints shall Whenever practical, the marking shall (4) Oxygen storage, (i) Oxygen be in conformance with the American be located on the shoulder of the cylinders shall not be stored near highly National Standard Safety Standard for cylinder. This method conforms to the combustible material especially oil and Non-Medical X-ray and Sealed Gamma- American National Standard Method for grease: or near reserve stocks of carbide Ray Sources. ANSI Z54.1--1963. Marking Portable Compressed Gas and acetylene or other fuel-gaa f 1910.253 Oxygerefuel sea welding end cutting. (a) Generalrequirements.--(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 gauge pressure) or 30 psia (200 kPa absolute). (The 30 psia (206 kPa absolute) limit is intended to prevent unsafe use of acetylene In pressurized chambers such as caissons, underground excavation* or tunnel construction.) This requirement la , not intended to apply to storage of acetylene dissolved in a suitable solvent in cylinders manufsetured and maintained according to U.S. 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 shall be used. (I) Personnel. Workmen m charge of the oxygen or fuel-gas supply equipment, including generators, and oxygen or fuel-gas distribution piping systems shall be instructed and judged Containers to Identify the Material Contained. ANSI Z48.1--1954. (iii) Compressed gas cylinders shall be equipped with connections complying with the American National Standard Compressed Cas Cylinder Valve Outlet and Inlet Connections, ANSI B57.1-- 1965. (iv) All cylinders with a water weight eapedty of over 30 pounds (13.8 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 cylinders--general. (1) Cylinders shall be kept sway from radiators and other sources of heat (ii) Inside of buildings, cylinders shall be stored in a well-protected, well- ventilated. dry location, at least 20 feet (0.1 m) from highly combustible materials such as oil or excelsior. Cylinders ahould be stored In definitely assigned place* 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 ss lockers and cupboards. (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, hand-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, cylinders, or near any other substance likely to cause or accelerate fire; or in an acetylene generator compartment (ii) Oxygen cylinders stored in outside generator housea shall be separated from the generator or carbide storage rooms by a noncombusuble partition having a fire-resistance rating of at least 1 hour. This partition shall be without openings and shall be gastight (iii) Oxygen cytindera in storage shall be separated from fuel-gas cylinders or combustible materials (especially cil or grease), a minimum distance of 20 feet (6.1 ro) or by a noncombustible barrier at least 5 feet (1.5 m) 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 m1) of oxygen (measured at 14.7 psia (101 kPa) and 70 *F (21.1 *C)), connected in service or ready for service, or more than 25,000 cubic feet (700 m*) of oxygen (measured at 14.7 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. NFPA No. 566--1965. (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 competent by their employers for this shall be limited to a total gas capacity of strike an oily surface, greasy clothes, or important work before being left in 2.000 cubic feet (50 m*) or 500 pounds enter a fuel oil or other storage tank. charge. Rules and instructions covering (135.9 kg) of liquefied petrcleum gas. (ii) (A) When transporting cylinders the operation and maintenance of (i) For storage in excess cf 2.000 cubic by a crane or derrick, a cradle, boat, cr oxygen or fuel-gas supply equipment feet (50 m*) total gas capacity of suitable platform shall be used. Slings or including generators, and oxygen or cylinders or 300 (135.9 kg) pounds of electric magnets shall not be used for fuel-gas distribution piping systems liquefied petroleum gas. a separate room this purpose. Valve-protection caps, chall be readily available. or compartment conforming to the where cylinder is designed to accept a (b) Cylinders and containers--(t) requirements specified in paragraph* cap. shall always be in place. Approval and marking, (i) All portable (0(6)(i)(H) and (fK6)(i)(I) of this section IB) Cylinders shall not be dropped or cylinders used for the storage and shall be provided or cylinders shall be struck or permitted to strike each other shipment of compressed gases shall be kept outside or in a special building. violently. constructed and maintained in Special buildings, rooms or (C) Valve-protection caps shall not be accordance with the regulations of the compartments shall have no open flame used for lifting cylinders from one U.S. Department of Transportation, 49 CTR parts 171-179. for heating or lighting and shall be well ventilated. They may also be used for vertical position to another. Bars shall not be used under valves or valvc- (ii) Compressed gas cylinders shall be storage of calcium cerbide in quantities protcction caps to pry cylinders loose !egibly marked, for the purpose of not to exceed 600 (271,8 kg) pounds. when frozen to the ground or otherwise D0 A 038460 r.ONFTDFNTTAl 13702 Federal Register / Vol. 55. No. 70 / Wednesday. April 11. 1990 / Rules and Regulations ' fixed: the use of wsrm (not boiling) be made to repair them. If trouble is stem of the valve while the cylinder ia in is recommended. Valve-protection experienced, the supplier should be sent use so that the fuel-gas flow can be ) are designed to protect cylinder a report promptly indicating the quickly turned off in ease of emergency. V ' as from damage. character of the trouble and the In the case of manifolded or coupled (D) Unless cylinders arer secured on a cylinder's serial number. Supplier's cylinders at least one such wrench shall special truck, regulators shall be* instructions as to its disposition shall be alwaya be available for immediate use. removed and valve-protection caps, followed. (c) Manifolding of cylinders--{\) Fuel- when provided for. shall be put in place [2] Complete removal of the stem from gas manifolds. (1) Manifolds shall be before cylinders are moved. a diaphragm-type cylinder valve shall approved either separately for each (E) 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)(tH) 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 velve 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 (13S.9 kg) of liquefied petroleum gas or (F) Cylinder valves shall be closed carefully. Rough handling, knocks, or 3.000 cubic feet (84 m *) of other fuel- before moving cylinders. (C) Cylinder valves shall be closed when work is finished. (H) Valves of empty cylinders shall be dosed. (I) 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 fire- resistant shields shall be provided. (1) Cylinders shall not be placed where they might become part 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 '.trie circuits such as for arc welding .hines. Any practice such as the V, ,>ping of an electrode against a cylinder to strike an arc shall be prohibited. (K) Cylinders shall never be used as rollers or supports, whether full or empty. (L) The numbers and markings stamped into cylinders shall not be tampered with. (M) No person, other than the gas supplier, shall attempt to mix gases in a cylinder. No one, except the owner of the cylinder or person authorized by him. shall refill a cylinder. (N) No one shall tamper with aafety devices in cylinders or valves. (O) Cylinders shall not be dropped or otherwise roughly handled. falls an liable to damage the cylinder, gas. More than one such manifold with valve or safety devices and cattae connected cylinder* may be located in leakage. the tame room provided the manifolds (C) Before connecting e regulator to a an at least SO feet (IS m) apart or cylinder valve, the valve shall be separated by a noncombustible barrier opened slightly and closed immediately. et least S feet (1J m) high having a fire- The valve shall be opened while resistance rating of at least one-half standing to one side of the outlet never In front of it Never crack a fuel-gas cylinder valve near other welding work or near sparks, flame, or other possible sources of ignition. (D) Before a regulator is removed from a cylinder valve, the cylinder valve shell be doted and the gas released from the regulator, (E) Nothing shell be placed on top of so 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 away from sources of ignition and slowly emptied. (C) A warning should be placed near hour. (Ill) Fuel-gas cylinders connected to one manifold having an aggregate capacity exceeding 300 pounds (13S.9 kg) of liquefied petroleum gaa or 3,000 cubic feet (84 m *) of other fuel-gat shall be located outdoors, or in a separate building or room constructed In accordance with paragraphs (f)(8](i)(H) and (f)(6)(i)(I) of this section. (iv) Separate manifold buildings or rooms may also be used for the storage of drum* 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 cylinders having leaking fuae plugs or pressure regulating devices. other leaking safety devices not to (3) High-pressure oxygen manifolds approach them with a lighted cigarette (for use with cylinders having a or other source of ignition. Such Department of Transportation service cylinder* should be plainly tagged: the pressure above 200psig (1.3$ MPaIf, (i) supplier should be promptly notified and Manifold* shall be approved either his instructions followed as to their separately for each component part or return. aa an assembled unit- (H) Safety devices ahall not be (11) Oxygen manifolds shall not be (P) Unless connected to a manifold, tampered with. located in an acetylene generator room. oxygen from a cylinder thail not be used (!) Fuel-gas shall never be used from without firtt attaching an oxygen cylinders through torches or other regulator to the cylinder valve. Before devices equipped with shutoff velves Oxygen manifolds shall be separated from fuel-gas cylinders or combustible materials (especially oil or grease), a connecting the regulator to the cylinder valve, the valve shall be opened slightly for an instant and the.i closed. Always stand to one side of the outlet when without reducing the pressure through e suitable regulator attached to the cylinder valve or manifold. ()) The cylinder valve shall always be minimum distance of ZO feet (6.1 m| or by a noncombustible barrier et least 5 feet (1JS m) high having a fire-resistance rating of at least one-haif hour. opening the cylinder valve. opened slowly. (iii) Except as provided in paragraph (Q) A hammer or wrench shall not be (K) An acetylene cylinder valve shall (c)(2](iv) of this section, oxygen used to open cylinder valves. If velves not be opened more than one and one- cylinders connected to one manifold cannot be opened by hand, the supplier <hall be notified. 'R)(l) Cylinder valves shall not be npered with nor should any attempt half turns of the spindle, and preferably no more than three-fourth* of a turn. (L) Where a special wrench ia required it shall be left in position on the shall ba limited to a total gaa capacity of 8,000 cubic feet (168 m *). More then one such manifold with connected cylinders may be located in the same room DO A 008461 OONFTDFNTTAI Federal Register / Vol. 55, No. 70 / Wednesday. April 11. 1990 / Rules and Regulations 15703 provided the manifolds are at least SO Law-Presauiw Manifold (iv) The aggregate capacity of fuel-gas feet (15 m) apart or separated by a Do Not Connect High-Pressure Cylinders cylinders connected to a portable ( noncombustible barrier at least 5 feet Maximum Pressure--250 pstg (1.7 MPa) manifold inside a building shall not V (1.5 m) high having a fire-resistance (4) Portable outlet headers. (1) exceed 3.000 cubic feet (84 m *) of gas. rating of at least one-half hour. Portable outlet headers shall not be used (v) Acetylene and liquefied fuel-gas (iv) An oxygen manifold, to which indoors except for temporary service cylinders shall be manifolded in a cylinders having an aggregate capacity where the conditions preclude a direct vertical position. of more than 6X00 cubic feet (168 m ') of supply from outlets located on the (vi) The pressure in the gas cylinders oxygen are connected, should be located service piping system. connected to and discharged outdoors or in a separata (ii) Each outlet on the service piping simultaneously through a common noncombustible building. Such a from which oxygen or fuel-gas is manifold shall be approximately equal. manifold, if located Inside a building withdrawn to supply a portable outlet having other occupancy, shall be located header shall be equipped with a readily (d) Service piping systems--(l) Materials and design. (0(A) Piping and in e separate room of noncombuatible construction having a fire-resistance accessible shutoff valve. (fill Hose and hose connections used fittings shall comply with section 2. Industrial Gas and Air Piping Systems, rating of at least one-half hour or in an for connecting the portable outlet header of the American National Standard area with no combustible material to the service piping shall comply with Code for Pressure Piping ANSI B31.1. within 20 feet (6.1 m) of the manifold. paragraph (e)(5) of this section. 1907, insofar as it does not conflict with (v) An oxygen manifold or oxygen (Iv) Master shutoff valves for both paragraphs (d)(l)(i)(A)(l) and bulk supply system which has storage oxygen and fuel-gas shall be provided at (d)U](0(A)(2) of this section: capacity of more than 13X00 cubic feet (364 m *) of oxygen (measured at 14.7 the entry end of the portable outlet header. (2) Pipe shall be at least Schedule 40 and fittings shall be at least standard psia (101 kPa) and 70 *F (21.1 *C)). (v) Portable outlet headers for fuel-gas connected in service or ready for service shall be provided with en service, or more than 25X00 cubic feet approved hydraulic back-pressure valve (700 m *) of oxygen (measured at 14.7 installed at the inlet and preceding the psia (101 kPa) and 70 *F (21.1 'Cl), service outlets, unless an approved including unconnected reserves on hand pressure-reducing regulator, an at the site, shall comply with the approved back-flow check valve, or an provisions of the Standard for Bulk approved hydraulic back-pressure valve Oxygen Systems st Consumer Sites, ia installed at each outlet Outlets NFPA No. 56&-1965. provided on headers for oxygen service (vi) High-pressure oxygen manifolds mey.be fitted for use with pressure- shall be provided with approved redudsg regulators or for direct hose pressure-regulating devices. connection. (3) Low-pressure oxygen manifolds (vi) Each service outlet on portable (for use with cylinders having a outlet headers shall be provided with a Department of Transportation service valve assembly that Includes a pressure not exceeding 200 psig (1J30 detachable outlet seal cap. chained or MPa)), (i) Manifolds shall be of otherwise attached to the body of the substantial construction suitable for use . valve. with oxygen at a pressure of 250 psig (vii) Materials and fabrication (1.7 MPa). They shall have a minimum procedures for portable outlet headers bursting pressure of 1.000 psig (0.8 MPa) shall comply with paragraphs and shall be protected by a safety relief (d)(l],(d)(2). end (d)(5) of this section. device which will relieve at a maximum (viii) Portable outlet headers shall be weight in sizes up to and including Cl inch nominal. (2)Copper tubing shall be Types K or L in accordance with the Standard Specification for Seamless Copper Water Tube. ASTM S88-66a. (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)(U) and (d)(l)(tii) of this section. ( (ii) (A) Oxygen piping and fittings at V pressures in excess of 700 psi(4X MPa), - shall be stainlesa 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 (1.7 MPe) 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 pressure of 500 psig (3.4 MPa). DOT- provided with frames which will support (8.8 MPa). 4L200 cylinders have safety devices the equipment securely In the comet (C) When oxygen is supplied to a which relieve at a maximum pressure of operating position and protect them service piping system from a low- 250 psig (1,7 MPa) (or 235 psig (1.6 MPa) from damage during handling and pressure oxygen manifold without an if vacuum insulation is used). operation. intervening pressure regulating device, (ii) Hose and hose connections subject (5) Manifold operation procedures, (i) the piping system shall have a minimum to cylinder pressure shall comply with paragraph (e)(5) of this section. Hose Cylinder manifoidt shall be installed under the supervision of someone design pressure of 250 psig (1.7 MPa). A pressure regulating device shall be used shall have a minimum bursting pressure familiar with the proper practices with at each station outlet when the of 1.000 psig (6.8 MPa). reference to their construction and use. (iii) The assembled manifold including (ii) All manifolds and parts used in connected equipment is for use at pressures less than 250 psig (1.7 Mra). leads shall be tested and proven gas- methods of manifolding shall be used (iii) (A) Piping for acetylene or tight at a pressure of 300 psig (2.04 MPa). only for the gas or gases for which they acetylenic compounds shall be steel or The fluid used for testing oxygen are approved. wrought iron. manifolds shall be oil-free and not (iii) When acetylene cylinders ere (B) Unalloyed copper shall not be combustible. coupled, approved flash arresters shall used for acetylene or acetylenic (iv) The location of manifolds shall be installed between each cylinder and compounds except in listed equipment. comply with paragrapha (c)(2)(ii), the coupler block. For outdoor use only, (2) Piping joints, (i) Joints in steel or (cj(2)(iii). (c)(2)(iv), and (c)(Z)(v) of this section. and when the number of cylinders wrought iron piping shall be welded, coupled does not exceed three, one flash threaded or flanged. Fittings, such as (v) The following sign shall be arrester installed between the coupler eils. tees, couplings, and unions, may be conspicuously posted at each manifold: block and regulator is acceptable. rolled, forged or cast steel, malleable ' 13704 Federal Register / Vol. 55. No. 70 / Wedneaday, April 11. 1990 / Rules and Regulations "ron or nodular iron. Gray or white caat petcoeks. shall be used, except that in nitrogen, or oil-free carbon dioxide shall / ron fittings ere prohibited. drips located out of door*, underground, be used to purge oxygen lines. v. (ii) Joints in brass or copper pipe shall and not readily accessible, valves may (4) Painting and signs, (i) be welded, brazed, threaded, or flanged. be used at such points if they are Underground pipe and tubing and If of the socket type, they shall be equipped with means to secure them in outdoor ferrous pipe and tubing shall be brczed with silver-brazing alloy or the closed position. Pipes leading to the covered or painted with a suitable similar high melting point (not less than surface of the ground shall be cased or material for protection against flOO'F [427*C)J filler metaL Jacketed where necessary to prevent corrosion. (iii) Joints in seamless copper, brass, loosening or breaking. (ii) Aboveground piping systems shall or stainless steel tubing shall be (v) Gas cocks or valves shall be approved gas tubing fittings or the Joints provided for all buildings at point* be marked in accordance with the American National Standard Scheme for shall be brazed. If of the socket type, where they will be readily accessible for the Identification of Piping Systems, they snail be brazed with silver-brazing shutting off the gas supply to these ANSI A13.1-19S8. alloy or similar high melting point (not buildings in any emergency. There shall (iii) Station outlets shall be marked to less than 800*F (427*0) filler metaL (3) Installation, (i) Distribution lines shall be installed and maintained in a safe operating condition. (ii) All piping shall be run as directly as practicable, protected againat 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 shall be thorooghly blown out with air. nitrogen, or carbon dioxide to remove foreign materials. For also be provided a shutoff valve in the discharge line from the generator, gas holder, manifold or other aource of tupply. (vi) Shutoff valvea shall not be installed in safety relief lines in such a manner that the safety relief device can be rendered ineffective. (vii) Fittings and lengths of pipe shall be examined internally before assembly and, if necessary freed from scale or dirt Oxygen piping end fittings shall be washed out with a suitable solution which will effectively remove grease . and dirt but will not react with oxygen. indicate the name of the gas. (5) Testing, (l) Piping systems shall be tested and proved gestight at 114 times the maximum operating pressure, and shall be thoroughly purged of air before being placed in service. The material used for testing oxygen lines shall be oil free and noncombustible. Flames shall not be used to detect leaks. (if) When flammable gae lines or other parts of equipment are being purged of air or gas. sources of ignition shall not be permitted near uncapped openings. (e) Protective equipment, hose, and *" oxygen piping, only oil-free air. oil-free nitrogen, or oil-free carbon dioxide thall be used. (iii) Only piping which has been Hot water solutions of caustic soda or trisodium phosphate ere effective cleaning agents for this purpose. (viii) Piping shall be thoroughly blown regulators--ii) General. Equipment shall be installed and used only in the service for which it fe approved and as recommended by the manufacturer. welded or brazed shall be installed in out after assembly to remove foreign (2) Pressure relief devices. Service V*. tunnels, trenches or ducts. Shutoff materials. For oxygen piping, oil-free air. piping systems shall be protected by valves shall be located outside such oil-fres nitrogen, or oil-free carbon pressure relief devices set to function at conduits. Oxygen piping may be placed dioxide shall be used. For other piping, not more than the design pressure of the. in the seme tunnel, trench or duct with air or inert gas may be used. systems and discharging upwards to a fuelrgas pipelines, provided there ia (ix) When flammable gas lines or safe location. good natural or forced ventilation. other parts of equipment are being (3) Piping protective equipment (i) (iv) Low points in piping carrying purged of air or gas. open lights or other The fuel-gas and oxygen piping systems, moist gas shall be drained into drip pota sources of ignition shall not be including portable outlet headers shall constructed so at to permit pumping or permitted near uncapped openings. incorporate the protective equipment draining out the condensate at (x) No welding or cutting shall be shown in Figures Q-l. Q-2, and Q-3. necessary intervals. Drain valvaa shall performed on an acetylene or oxygen When only a portion of a fuel-gas be installed for this purpose having pipeline, including the attachment of system is to be used with oxygen, only outlets normally closed with screw caps hangers or supports, until the line has that portion need comply with this or plugs. No open end valves or been purged. Only oil-free air. oil-free paragraph (e)l3)(i). v. DO A 038&A3 CONFTDFNTTAl Federal Renter / Vql. 55. No. 70 / Wednesday. April 11. 1990 / Rules and Regulations . 13705 legend P,--Protective equipment in fuel gas piping S,--Backflow prevention davice(B) V,--Fuel gas station outlet valve at fuel gas station outlet v0~oxygen station outlet valve S0--Backflow prevention device(s) at oxygen station outlet (ii) 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 fuel* gas supply system: (B) Passage of a flash back into the fuel-gas supply system: and (Cl 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. (1) The protective equipment shall be located in the main 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 Pr) shall be located as shown in either Q-2 and Q-3. (2) Backflow protection shell be provided by an approved device that will prevent oxygen from flowing into the fuel-gai system or fuel from flowing into the oxygen system (see S* Figures and (^2). p) Flash-back protection shall be provided by an approved device that will prevent flame from passing into the fuel-gas system. W) Back-pressure protection shall be provided by an approved pressure-relief device set at a pressure not greater than the pressure rating of (he backflow or the flashback protection device, whichever is lower. The pressure-relief device shall be located on the downstream side of the backflow 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 ere unavoidable, drip pots 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 gae discharge: shall be located away 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 shell be withdrawn upstream of the piping protective devices. (4) Station outlet protective equipment, (i) A check valve, pressu regulator, hydraulic seal, or combin: of these devices shall be provided at 00 ^ 13700 Federal Register / Vol. 55, No. 70 / Wednesday. April 11. 1S90 / Rules and Regulationa each station outlet including those on 300 psi (2.04 MPa). Oil-free air or an oil- generator or its connections. Acetylene "r portable headers, to prevent backflow, free inert gaa shall be used for the test. generators shall be grounded. s shown in Figures Q-l. Q-2. and Q-3 (v) Hose showing leaks, bums, worn (0) Generators shall be placed where V and designated as Sr and S> places, or other defects rendering it unfit water will not freeze. The use of (ii) When approved'pipeline for service shall be repaired or replaced. common salt (sodium chloride) or other protective equipment (designated Pr) is (8) Pressure-reducing regulators, (i) corrosive chemicals for protection located at the station outlet 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 la required. which they are intended. The regulator of this section.) (iii) A shutoff valve (designated Vf inlet connections shall comply with (C) Except when generators are and Vo) 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. upstream side of other station outlet (ii) When regulators or parts of (f)(7)(v) of this section, sources of ignition shall be prohibited in outside equipment regulators, including gages, need repair, generator houses or inside generator (iv) If 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 Connection Standards, 1958, 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, Compressed Gas Association. (vi) Station outlets may terminate in pipe threads to which permanent connections are to be made, such as to a machine. (vii) Station outlets 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. V. (via) Where station outlets ere (Ui) Gages on oxygen regulators shall be marked "USE NO OIL" (iv) Union nuts and connections on regulators shall be inspected before use to detect faulty seata which may cause leakage of gas when the regulators are attached to the cylinder valves. (f) Acetylene generators--{l) 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 aingie charge: the manufacturer's 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 ana pressure limitations, (i) generator except when the generator is provided with an adequate open overflow or automatic water shutoff which will effectively prevent overfilling of the generator. Where a noncontinuous 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 shell 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 equipped with approved backflow and flashback protective devices, as many The total hourly output of a generator shall not exceed the rate for which it is 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 the drain 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 (ii)(A) Each generator shall be equipped with a shutoff valve and provided the fuel-gas capacity of any 1 cubic foot (0.028 m1) per hour per pound of carbide required for a single provided with a vent pipe. (B) The escape or relief pipe shall be one torch does not exceed 15 cubic feet (0.42 mfl per hour. This paragraph (e)(4)(vm) does not apply to machines. complete charge. (ii) Relief valves shall be regularly operated to Insure proper funenoning. rigidly Installed without traps and so that any condensation will drain back to the generator. (3) Hose and hose connections, (i) Relief valves for generating chambers (C) The escape or relief pipe shall be Hose for oxy.fuel gas service shell shall be set to open at a pressure not in carried full size to a suitable point comply with the Specification for excess of 15 psig (103 kPa gauge outside the building. It shall terminate in Rubber Welding Hose. 1958. 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 excess of 20 above the roof, and as far away aa (ii) When parcllel lengths of oxygen psig (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 (10.2 cm) out of pressures exceeding 1 psig (7 kPa gauge such as flues or chimneys and tracks 12 inches (30.5 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 snail 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 fattened (4) Stationary acetylene generators (0.9 m) from combustible construction. !n a manner that will withstand, without (automatic and nonautomatic/. (i)(A) (iii)(A) Cat holders shall be icakaae, twice the pressure to which The foundation shall be so arranged that constructed on the gasometer principle, y are normally subjected in service. the generator will be level and so that the bell being suitably guided. The gas v out in r.o case less than a pressure of no excessive strain will be placed on the bell shall move freely without tendency 00 A 0 3Ps4f,^j OONFT ofnttai' Federal Remitter / Vol. 5S. No. 70 / Wednesday, April 11. 1990 / Rule* and Regulation* 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 lending point of the bcIL When the gas holder is located indoors, the room shall be ventilated in accordance with paragraph (0(8)(ii) of this section and heated and lighted in accordance with paragraphs (f)(8)(iii) and (f)(6)(lv) of this section. (C) When the gas holder is not located within a heated building, gas holder teals shall be protected against freezing. (D) Means shall be provided to stop the generator-feeding mechanism before the gas holder reiches the upper limit of its travel. (E) When the gee holder is connected to only one generator, the gas capacity of the holder shall be not lesa than onethird of the hourly rating of the generator. (F) If acetylene la used from the gas holder without increase in pressure at some points but with increase in pressure by a compressor or booster pump et other points, approved piping protective devices shall be initalled in each supply line. The low-pressure . protective device shall be located f between the gaa holder and the ahop ' 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 Pp) 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 an approved type. (B) Wiring and electrical equipment In compressor or booster pump rooms or enclosures shall conform to the provision* of 11010.324 of this port for Class 1, Division 2 locations. (C) Compressors and booster pump equipment shall be located in well- ventilated areas away from open flames. electrical or mechanical sparks, or other ignition sources. (D] Compressor or booster pumps shall be provided with pressure relief vaivea which will relieve presume exceeding IS psig (103 kPa gauge pressure) to a safe outdoor location at 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) All portable generators shall be of a type approved for portable uae. (B) Portable generators shell not be used within 10 feet (3 m) of combustible material other than the floor. DO A 038466 OONFTDFNTTAI / 9 13708 Federal Register / Vol. 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 (B) Lamps installed outside of wiredglass panels set in gas-tight frames in '5 times the total gas-generating (009 ma) per 50 cubic feet (1.4 tnJ) of the exterior walls or roof of the capacity per charge of all generators In room volume and may consist of any generator house or room are acceptable. the room. Generators shall not be used one or any combination of the following: (v) Electric switches, telephones, and in rooms having a ceiling height of less Walls of light noncombustible material ail other electrical apparatus which may than 10 feet (3 m). (To obtain the gas preferably single-thickness, single cause a spark, unless specifically generating capacity in cubic feet per strength glass; lightly fastened hatch approved for use inside acetylene charge, multiply the pounds of carbide covers; lightly fastened swinging doors generator rooms, shall be located per charge by 4.5.) in exterior walls opening outward; outside the generator house or in a room (D) Portable generators shall be lightly fastened walla or roof designed or space separated from the generator protected against freezing. The use of to relieve at a maximum pressure of 25 room by a gas-tight partition, except that salt or other corrosive chemical to pounds per square foot (0.001 MPa). where the generator system is designed prevent freezing is prohibited. (F) The installation of acetylene (11) (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 (B) When charged with carbide, this will not be construed as prohibiting ortable generators shall not be moved such installations on the roof or top floor y crane or derrick. of a building exceeding such height (C) 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 tha vehicles. If wall of the room shall be an exterior transported by truck, the motor 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 (E) Portable generators shall be be protected by a swinging type, self seated at a safe distance from the closing fire door for a Class B opening welding position so 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 glass and approved metal frames with hot materials or processes. fixed sash. Installation shall be in (6) Outside generator houses and inside generator rooms for stationary accordance with the Standard for the Installation of Fire Doors and Windows. acetylene generators, (i) (A) No opening' NFPA 80-1970. in any outside generator house shall be (ii) Inside generator rooms or outside located within S feet (1.5 m) of any opening in another building. (B) Walls, floors, and roofs of outside generator bouses shall be of generator houses shall be welt ventilated with vents located at floor and ceiling levels. (iii) Heating shall be by steam, hot noncombustible construction. water, enclosed electrically heeted (C) When a part of the generator house is to be used for the storage or manifolding of oxygen cylinders, the elements or other indirect means. Heating by flames or fires shall be prohibited in outside generator houses space to be so occupied shall be or inside generator rooms, 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, shall have natural light during daylight 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 a 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 part for Class L Division 2 locations. (7) Maintenance and operation, (i) Unauthorized persons shaU 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 water-carbide residue mixture drained from the generator shall not be discharged into sewer pipes or stored in areas near open flames. Clear water from residue settling pits may be discharged into sewer pipes. (li) 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 of the type of construction stated in hours. Where artificial lighting is distributing the charge. paragraph (f)[6)(i)(H) of thia section. necessary it shall be restricted to (iii) Generator water chambers shall Such separation walls shall be without electric lamps installed in a fixed be kept filled to proper level at all times openings and shall be joined to the floor, position. Unless specifically approved except while draining during the other walls and ceiling or roof in a for use in atmospheres containing recharging operation. manner to effect a permanent gas-tight joint. acetylene, such lamps shall be provided (iv) Whenever repairs are to be made with enclosures of glass or other or the generator is to be charged or (D) Exit doors shall be located so as to be readily accessible in case of emergency. (E) Explosion venting for outside enerator houses and inside generator noncombustible material so designed and constructed as to prevent gas vapors from reaching the lamp err socket and to resist breakage. Rigid conduit with threaded connections shall be 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 .ooms shall be provided in exterior used. hot work or other operations which DO A 038467 OONFTDFNTTAl Federal Register / VqL 55. N . 70 / Wednesday, April 11. 1990 / Rules and Regulations 13703 produce a source of ignition, the carbide (iii) Calcium carbide in excess of 5XXX) temperature of the cooling air does not- charge and feed mechanism shall be pounds (24(68 kg) shall be stored io one- exceed 40 *C (104 *F) and where the completely removed. All acetylene shall story buildings without cellar or altitude does not exceed 3X300 feet be expelled by completely flooding the basement and used for no other purpose, (1,005.8 m). 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 ia of noncombustible gases, dust, and light raya produced by piping system. The generator shall be construction, it may adjoin other one- the welding arc kept filled with water, if possible, or story buildings if separated therefrom by (H) Unusual service conditions may positioned to hold as much water as unpierced firewalls: if it is detached less exist, and in auch circumstances passible. 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 requirements of the room where there are other generators any of the mutually exposing sides of service. Chief among these conditions unless ail 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 Are. (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, (i) Calcium carbide in quantities not to exceed 600 pounds (27Z2 kg) may be stored indoors any other building exceeding two stories. (3) Storage outdoors, (i) Caldum carbide in unopened metal containers may be stored outdoors. (U) Carbide containers to be stored outdoors shall be examined to make 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 eech 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 hive been in storage the longest shall ba used first (C) Exposure to excessive oil vapor. (D) Exposure to flammable gases. (E) Exposure to abnormal vibration or shock. (F) Exposure to excessive dust. (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 end cutting-- 80 volts. (B) Automatic (machine or mechanized) arc welding and cutting-- 100 volts. (ii) Direct-current machines (A) Manual arc welding and cutting-- 100 volts. (B) Automatic (machine or in dry, waterproof, and well-ventilated locations. (A) Calcium carbide not exceeding 600 pounds (272.2 kg) may be stored indoors in the same room with fuel-gas cylinders. (B) Packages 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 (0.5 kg) in any other unsealed package of the same size of carbide in the room. (ii) Calcium carbide exceeding 600 pounds (272.2 kg) but not exceeding 5.C00 pounds (2.268 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 shall be constructed in accordance with paragraphs (0(6)(i)(H) and (f)(8)(i)(I) of this section and ventilated in accordance with paragraph (f)(6)(ii) of this section. These rooms shall be used for no other purpose. {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 shall be installed safely as specified by with the high voltage by adequate paragraph (c) of this section. Insulation or other means. 13) Instruction. Workmen designated (iv) For a.c. welding under wet to operate arc welding equipment shall conditions or warm surroundings where have been properly instructed and perspiration ia 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 is recommended to section. reduce the shock hazard. (b) Application ofarc welding (4) Design, (i) A controller Integrally equipment--{\) General. Assurance of mounted in an electric motor driven consideration of safety in design is welder shall have capacity for carrying obtainable by choosing apparatus rated motor current, shall be capable of complying with the Requirements for making and interrupting stalled rotor Electric Arc-Welding Apparatus. NEMA current of the motor, end msy serve as EW-4-1962. National Electrical the running overcurrent device if Manufacturers Association or the Safety provided with the number of overcurrcnl Standard for Transformer-Type Arc- units as specified by Subpart S of this Welding Machines. ANSI C33.2--1958, part. Underwriters' Laboratories. . (ii) On ail types of are welding (2) Environmental conditions. (1) machines, control apparatus shall be Standard machines for arc 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 DO A 038468 oonftdfnttai 13710 Federal Regieter / Vol. 55, No. 70 / Wednesday, April 11. 1990 / Rules and Regulations to input circuits shall be completely (3) Supply connections and freed from edherent metal particles of enclosed and accessible only by means conductors, (1) A disconnecting switch spatter on contact surfaces. Coiled of tools. or controller shall be provided at or near welding cable shall be spread out before (iv) Terminals for welding leads each welding machine which is not use to avoid serious overheating and should be protected from accidental equipped with such a switch or damage to insulation, electrical contact by personnel or by controller mounted as an integral part of (3) Grounding. Grounding of the metal objects. l.e, vehicles, crane hooks, the machine. The switch shall be in welding machine frame shall be etc. Protection may be obtained by use accordance with subpart S of this part checked. Special attention shall be given of: Dead.front receptacles for plug Overcunent protection shell be to safety ground connections of portable connections: recessed openings with provided as specified in subpart S of machines. nonremovable hinged covers: heavy this part A disconnect switch with (4) Leaks. There shall be no leaks of insulating sleeving or taping or other overload protection or equivalent cooling water, shielding gas or engine equivalent electrical and mechanical protection. If a welding lead terminal which is 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 is 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 voltage exceeding 60 volts. (c) Installation ofarc weldinq equipment--(1) General Installation including power supply shall be in accordance with the requirements of Subpart S of this pari. (2) Grounding, (i) The frame or case of the welding machine (except enginedriven mechines) shall be grounded disconnect and protection means, emitted by subpart S of this part shall e 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 less than the rated primary current of the welding machines. (iii) For groups of welding machines, the rated current-carrying capacity of conductor* 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 based 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. (iv) In operations involving several welder* on one structure. dx welding process requirements may require the use of both polarities; or supply circuit limitations for ax. welding may require distribution of machines among the phases of the supply circuit In such cases no load voltages between fueL (5) Switches. U shall be determined that proper switching equipment for shutting down the machine is provided. (0) Manufacturers'instructions. Printed rules and instructions covering operation of equipment supplied by the manufacturers shall be strictly followed. (7) Electrode holders. Electrode holder* when not in use shall be so placed that they cannot make electrical contact with persons, conducting objects, fuel or compressed gas tanks. (8) Electric shock. Cables with splices within 10 feet (3 m) of the holder shall not be used. The welder should not coil or loop welding electrode cable around parts of his body. (9) Maintenance. (1) The operator should report any equipment defect or safety hazard to his supervisor and the use of the equipment shall be discontinued until Its safety has been assured. Repairs shall be made only 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 under the conditions and according to slectroda holders will be 2 times normal replaced. Joining lengths of work and the methods prescribed in Subpart S of this pin. In dx or 1.1.41.1-73. or 2 times normal on ax. machines. Similar voltage electrode cables shall be done by the use of connecting means specifically (it) Conduits containing electrical conauctors shall not be used for completing e work-lead circuit. Pipelines bsli not be used si a permanent part of a work-lead circuit, but may be used differences will exist if both ax. and dx welding are dona on ths sama structure. (A) All dx machine* shall be connected with the tame polarity. (B) All ax machines shall be intended for the purpose. The connecting means snail have insulation adequate for the service conditions. 11*10255 Resistance eewtno. durws construction, extension or repair connected to the same phase of the providins current is not earned through supply circuit and with the sama (a) Genera/--(1) Installation. Ail equipment shall ba installed by a threaded joints, flanged bolted joints. or instantaneous polarity. qualified electrician in conformance caulked |oinu and that special (dl Operation and maintenance--(t| with subpert S of this pert. There shall precautions are used to avoid sparking Central Workmen assigned to operate be a safety-type disconnecting switch or si connection of iht work-lead cable- or maintain arc welding equipment shall e circuit breaker or circuit interrupter to (ill) Chains, wire ropes, crane*, hoists, be acquainted with the requirement* of open each power circuit to the mechine, and elevators shall not be used to cany this section and with < 1010252 (a), (b) conveniently located at or near the welding current. and (c) of this part: if doing gas-shielded machine, so that tha power can be shut |iv) Where a structure, conveyor, or future is regulsrly employed as a arc welding, also Recommended Safe off when the machine or its controls are Practices (or Gat-Shielded Arc Welding. to be serviced. welding current return circuit, joints hall be bonded or provided with A6-1-1060. American Welding Society. (2) Machine hook up. Before starling (2) Thermal protection. Igmtron tubes used in resistance welding tqutpment adequate current collecting devices. (vj Ail ground connections shall be checked to determine that they are mechanically itrong and electrically adequate (or the required current. operations all connecuona to ths mschins shall be checked to make certain they are property made. The work lead shall be firmly attached to the work: magnetic work clamps shall ba shall be equipped with a thermal protection switch. 01 Personnel. Workmen designated to operate resistance welding equipment shall have been property instructed and DO ^ Federal Register / Vol. 55. No. 70 / Wednesday. April 11. 1990 / Rules and Regulations 13711 judged competent to operate such receptacles (one in each comer) shall be equipment provided so that when safety pins are (4) Guarding. Controls of all automatic removed and inserted in the ram or or air and hydraulic clamps shall be platen, the press becomes inoperative. where toxic elements and metal fumes are given off, ventilation shall be provided in accordance with } 1910252(C) of this part. c arranged or guarded to prevent the (9) Grounding. Where technically (2) Fire curtains. For the protection of operator from accidentally activating practical, the secondary of all welding the operators of nearby equipment fire* them. transformers used in multispot, resistant curtains or suitable shields (b) Spot and seam welding machines projection and seam welding machines shall be set up around the machine and (nonportable)--{\) Voltage. All external shall be grounded. This may be done by in such a manner that the operators 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 nigh 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 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 disconnect shall be arranged to open both sides of the line when welding current is not present (c) Portable welding machines--{l) 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 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, forthe 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. open. A manually operated switch or counterbalancing impractical or (1910254 Source* of standards. suitable positive device shall be unnecessary. installed, in addition to the mechanical interlocks or contacts, as an added (2) Safety chains. All portable welding guns, transformers and related Sac. Soma safety measure assuring absolute discharge of all capacitors. (3) Interlocks. All doors and access equipment that is suspended from overhead structures, eye beams, trolleys, etc, shall be equipped with ANSI 249.1--1907, Safety in Welding and Cutsng. 1910252-255----- (a) NFFA-ai-1909. Welding 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 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. (and Cutting Oxygen Fuel Gas Systffn. (b) ANSI Z--49.1-1907. Safety In Wetdmg and Cuttxtg. (e) NFPA--616-1962. Cutting and Warning Procasaa*. (4) Guarding. All press welding (3) Clevis. Each clevis shall be (d| 41 CFB 50-204.7. machine operations, where there is a capable of supporting the total shock possibility of the operator's fingers being load of the suspended equipment in the under the point of operation, shall be event of trolley failure. } 1910.257 Standards organizations. ' 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 Ail chains, gears, operating bus linkage, and belts shall be protected by adequate guards, in accordance with $ 1910.219 of this part (4) Switch guards. All Initiating switches, including retraction and dual schedule switches, located on the portable welding gun shall be equipped with suitable guards capable of preventing accidental initiation through contact with fixturing. operator's clothing, etc. Initiating switch voltage shall not exceed 24 volts. Specific standards of the following organizations have been referenced in this subpart. Copies of the referenced standards may be obtained from the issuing organizations. The names and addresses of the issuing organizations are as follows: (a) American National Standards (5) Shields. The hazard of flying (5) Moving holder. The movable Institute (ANSI). 1430 Broadway, New sparks shall be. wherever practical, holder, where it enters the gun frame, York. NY 10018. eliminated by installing a shield guard shall have sufficient clearance to (b) National Fire Protection of safety glass or suitable fire-resistant prevent the shearing of fingers Association, Batterymarch Park, Quincy, plastic at the point of operation. carelessly placed on the operating MA 02269. Additional shields or curtains shall be installed as necessary to protect passing persons from flying sparks. (Sea f 19i0.2S2(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 ail special multispot welding machines, including 2-post and 4-post weld presses. (8) Safety pins. On large machines, movable holder. (8) Grounding. The secondary end 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 (c) Compressed Gas Association, Inc, 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. Le|eune Road. P.O. Box 351040, Miami, FL 33135. (f) Rubber Manufacturer* Association. 1400 K Street NW, Washington, DC 20005. |FR Doe. 90-7799 Filed 4-10-90; 8:4S em| four safety pins with plugs and materials may contain a film of oil and ILUNO COO* on A 038470 CONFTDFNTTAI