Document pBkyoG9nVZywobG9w03oxQjrD

fro;.', w: s. stroud <'- MEMORANDUM 1980-04-16 RE: MARINITE SHOP - BUILDINGS! The purpose of this letter is to report the action planned to control asbestos dust by R. Overby, A. Cain, M. Cotton, J. Vergho, IV. Stroud, and H. Covington on April 16. Short Term _ 1. Additional tests for asbestos dust in Building are to be performed to supply information for short term control and engineering design. Joe Vergho will coordinate this activity with Mike Vaudreuil's assistance. Target date - April 24. 2. Engineering improvements will be made to the existing exhaust system. Allen Cain and Ralph Matera are handling this. Target date for comple tion is June 15. 3^ A vacuum sweeper suitable for handling asbestos dust will be purchased. Allen Cain handling. 4. Administrative controls may be implemented depending upon results from item 1 above. Herman Covington and W. Stroud handling. Target date May 1. Long Term 1. Plans will be formulated to reduce the asbestos dust environment to below 2.0 fibers per milliliteraverage. For this purpose, W. Stroud with the assistance of Haig Sakoian will select a model location to visit.- 2. The status of development of asbestos free marinite will be determined by W. Stroud. W. S. STROUD WSS:lkb xc: Meeting Attendees R. C. Finney H. Yount B. M. Stamer C. L. Kamperman ^Mf^Vaudresxil^'Pittsburgh Office H. Sakoian, Pittsburgh Office H&S BDD mlF EER ^5 JOD. TBB jo CCD RMJ h* DB HGS jg IMN PHS g EDS MJV . 410422 0404 410422 0405 * fr/- -y-` ' .* .%.v. :.. *". :-L TENNESSEE. OP( A 7'tmi: ASBESTOS SURVEY. CW, SHtBT liSfe* ^ 1 --- \\wate-\1 1 SHIFT eQPEAATioM REMA RKS: |*rV;WS~4i> s0W>*M!P#s*> inswsPKos1-; Plant BLDCt. 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SPECIFIC OPERATIONS 5-85 LOW VOLUME-HIGH VELOCITY EXHAUST SYSTEMS The low volume high velocity exhaust system is the unique application of exhaust which uses small vol umes of air at relatively high velocities to control dust from portable hand tools and machining operations, tootrol Is achieved by exhausting the air directly at the point of dust generation using close-fittlng, customs Amade-hoods: Capture velocities are relatively high but the exhaust volume is low due to the small distance required. For flexibility, small diameter, light-weight plastic hoses are used with portable tools resulting In very high duct velocities. `This method allows the application of local exhaust ventilation to portable tools which otherwlse would require relatively large air volumes and large ductwork when controlled by convert tlohal exhaust methods. This technique has found a variety of applications although its use is not common. Rock drilling dust has been controlled by using hollow core drill steel with suitable exhaust holes in the drill bits. Air is exhausted either by a multi-stage turbine of the size generally used in industrial vacuum cleaners or, in the case of one manufacturer (71), by the exhaust air from the pneumatic tool which operates a Venturi to withdraw air from the drill. Application has been made with flexible connections to a central vacuum system to aid in the con trol of graphite dust at conventional machining operations. One to two inch diameter flexible hose was used with simple exhaust hoods mounted directly at the cutting tool. In a similar application for the machining of beryllium (72), a central vacuum system using 1 1/2" I.D. flexible hoses was employed. The exhaust hoods were made of iuclte or transparent material and were tailor-made to surround the cutting tools and much of the work. Exhaust volumes vary from 120 to ISO cfm with inlet velocities of 11,000 to 14,000 fpm. In another application (73), a portable orbital sanding machine has been fitted with a small exhaust duct sur rounding the edge of the plate. A fitting has been provided to connect this to the flexible hose of a standard domestic vacuum cleaner. VS-801 to VS-806, 802, 803 and 804 illustrate a custom-made line of exhaust hoods available (74). The re quired air volumes range from 60 cfm for pneumatic chisels to 380 cfm for swing grinders. (See Table 5-8-1) Due to the high entering velocities involved, static pressures are in the range of 7" to 14" of mercury (95" to 190" water gauge). This high pressure is necessary to create the high capture ve locities at the dust source to control the dust. TABLE 5-8-1. EXHAUST VOLUMES REQUIRED FOR LOW VOLUME-HIGH VELOCITY SYSTEM I.D. Plastic cfm Hose Size Disc sanders, 3-9 inch diameter Vibratory Pad Sander - 4 x 9 Router, 1/8" - 1" Belt sender 3" - 4,000 fpm Pneumatic chisel Radial wheel grinder Surface die grinder, 1/4" Cone wheel grinder Cup stone grinder, 4" Cup type brush, 6" Radial wire brush, 6" Hand wire brush 3x7 Rip out knife Rip out cast cutter Saber saw Swing frame grinder 2x18 Saw abrasive 3" 00-175 100 60-100 70 60 70 60 90 100 150 90 60 175 130 120 380 100 1"- 1 1/2" 1 1/4" 1" - 1 1/4" 1" 1" 1" 1" 1 1/4" 1 1/4" 1 1/2" 1 1/4" 1" 1 1/2" 1 1/2" 1 1/2" 2 1/2" 1 1/4" The dust is conveyed at high velocities in small diameter flexible hoses ranging from 3/8" to 2" I.D. Exhaust Is provided by a multi-stage centrifugal turbine capable of producing static pressures of approximately 12" of mercury (163'! water). A single stage positive displacement axial flow ex hauster has the advantage of generating a vacuum in the range of 22". of mercury (299" water) below atmospheric pressure. The fabric collector can be cleaned by a simple, manual valve which admits .air;into the.clean side of the fabric bringing this side of the fabric to atmospheric pressure. Since fth^dlrty'iside'of the fabric is at a pressure.far below, atmospheric, this causes rapid air flow through ^^^^^-i^andproylde^fevcrsigjcleaiiing^ i *y*j?*' 410422 0416 i 410422 0417 t 410422 0420 $ 410422 0421 i Ifr v>v. mm ,W-9~ IOATB 4- .. - SHiFT ** OPf=R A T t>tJ i\*>5, : **V .... ' V '.v * i Rema RKS\ mm M HHEE Plant .; , r. Jx.'-.-: . Tfi ; - - BLDfr ; . yD '- tiPpSE yr :,... * tt " , V^HK ~_~ U>i *' - . ^-e-Ai' .^<4^ < "^ji .* * * '1 1 Samp UNO L nra START END. AH f/n/v.) - * -unfr .i AM FLi )WU?H) d-lffo r 77/hf /7 :W - -' ' NUtoff ZA riF AS8ES rosfrti^EAS AE A Fi DLm : : ^ WJ/O SS.A \ickoNi , ..j* ii3. 1 ~ 111--%'-- V& 1 r~ I / t ny t . 5 (0 <st c f? $? 1% 10 !H l1 n 1o (o ID -' - . X!v. B ' V - .^ J *\ 1 CJti CAZ A. >? r/z: a;o mVi -- 7.J LOk}AAJw/?Ai rnU^AOlJS Cw Z/7 r f -lij/ /S' ( ,- y' y /?.: ,, c,- :-y/ A/p J -- - / y r - S j t y . S/WPL eo by 410422 0438 \ % TEHN ZSSEE OPEt AT) ON < bstos "> r2 ' fS DATE SHIFT Plant 1 ---- OPE A ft t/oaj 5fcftVi = y RLDCr. OA 7? SNB ET RE. MR RKS'. _ ! . 1 SADJP UNO D ATA START HD AU (min.) 1 Afn Fit npCcjfh) 71^ \ T!n\ / J<2 / Numb zA nP asses ros mFAS PE A FiE / AO- ! )&RT `1 j I i. J >' 51 W x' y* f-- r 1 // 72 y 4 i r~ 1i 10 / l/ D yn ' y v. // 0/ t _y 9 Ji cjh at t LATU rJC ~wo/-v - A ' 4 \jyn ( y. rv. ) r'r/) ~7 "> / -< J///W U^AOfOS ss: A 4 EDJ1Y 410422 0439 SPECIFIC OPERATIONS 5-85 LOW VOLUME-HIGH VELOCITY EXHAUST SYSTEMS The lov volume high velocity exhaust system is the unique application of exhaust which uses small vol umes of air at relatively high velocities to control dust from portable hand tools and machining operations. Control is achieved by exhausting the air directly at the point of dust generation using close-fitting, custommade hoods. Capture velocities are relatively high txit the exhaust volume is low due to the small distance required. For flexibility, small diameter, light-weight plastic hoses are used with portable toots resulting in very high duct velocities. This method allows the application of local exhaust ventilation to portable tools which otherwise would require relatively large air volumes and large ductwork when controlled by conven tional exhaust methods. This technique has found a variety of applications although its use is not common. Rock drilling dust has been controlled by using hollow core drill steel with suitable exhaust holes in the drill bits. Air is exhausted either by a multi-stage turbine of the size generally used in industrial vacuum cleaners or, in the case of one manufacturer (71), by the exhaust air from the pneumatic tool which operates a Venturi to withdraw air from the drill. Application has been made with flexible connections to a central vacuum system to aid in the con trol of graphite dust at conventional machining operations. One to two inch diameter flexible hose was used with simple exhaust hoods mounted directly at the cutting tool. In a similar application for the machining of beryllium (72), a central vacuum system using 1 1/2" I.D. flexible hoses was employed. The exhaust hoods were made of lucite or transparent material and were tailor-made to surround the cutting tools and much of the work. Exhaust volumes vary from 120 to 150 cfm with inlet velocities of 11,000 to 14,000 fpm. In another application (73), a portable orbital sanding machine has been fitted with a small exhaust duct sur rounding the edge of the plate. A fitting has been provided to connect this to the flexible hose of a standard domestic vacuum cleaner. VS-801 to VS-806, 802, 803 and 804 illustrate a custom-made line of exhaust hoods available (74). The re quired air volumes range from 60 cfm for pneumatic chisels to 380 cfm for swing grinders, iSee TablcI 5-8-1) Due to the high entering velocities involved, static pressures arc m the range of 7" to 14" of I mercury (95" to 190" water gauge). This high pressure is necessary to create the high capture ve locities at the dust source to control the dust. TABLE 5-8-1. EXHAUST VOLUMES REQUIRED FOR LOW VOLUME-HIGH VELOCITY SYSTEM Disc sanders, 3-9 inch diameter V ibratory Pad Sander -4x9 Router, 1/8" - 1" Belt sander 3" - 4,000 fpm Pneumatic chisel Radial wheel grinder Surface die grinder, 1/4" Cone wheel grinder Cup stone grinder, 4" Cup type brush, 6" Radial wire brush, 6" Hand wire brush 3x7 Rip out knife Rip out cast cutter Saber saw Swing frame grinder 2 x 18 Saw abrasive 3" cfm 60-175 100 80-100 70 60 70 60 90 100 150 90 60 175 150 120 380 100 I.D. Plastic Hose Size l- - l 12" 1 14" 1" - 1 1/4" 1" 1" 1" 1" 1 1/4" 1 1/4" 1 1/2" 1 1'4" 1" 1 1, 2" l 1 2" 1 1/2" 2 1/2" 1 1/4" The dust is conveyed at high velocities in small diameter flexible hoses ranging from 3/8" to 2" I.D. Exhaust is provided by a multi-stage centrifugal turbine capable of producing static pressures of approximately 12" of mercury (163" water). A single stage positive displacement axial flow ex hauster has the advantage of generating a vacuum in the range of 22" of mercury (299" water) below atmospheric pressure. The fabric collector can be cleaned by a simple, manual valve which admits air into the clean side of the fabric bringing this side of the fabric to atmospheric pressure. Since the dirty side of the fabric is at a pressure far below atmospheric, this causes rapid air flow through the fabric and provides reverse cleaning. 410422 0440 SPECIFIC OPERATIONS 5.35 LOW VOLUME-HIGH VELOCITY EXHAUST SYSTEMS The low volume high velocity exhaust system is the unique application of exhaust which uses small vol umes of air at relatively high velocities to control dust from portable hand tools and machining operations. Control is achieved by exhausting the air directly at the point of dust generation using close-fitting, custommade hoods. Capture velocities are relatively high but the exhaust volume is low due to the small distance required. For flexibility, small diameter, light-weight plastic hoses are used with portable tools resulting in very high duct velocities. This method allows the application of local exhaust ventilation to portable tools which otherwise would require relatively large air volumes and large ductwork when controlled by conven tional exhaust methods. This technique has found a variety of applications although its use is not common. Rock drilling dust has been controlled by using hollow core drill steel with suitable exhaust holes in the drill bits. Air is exhausted either by a multi-stage turbine of the size generally used in industrial vacuum cleaners or, in the case of one manufacturer (71), by the exhaust air from the pneumatic tool which operates a Venturi to withdraw air from the drill. Application has been made with flexible connections to a central vacuum system to aid in the con trol of graphite dust at conventional machining operations. One to two inch diameter flexible hose was used with simple exhaust hoods mounted directly at the cutting tool, in a similar application for the machining of beryllium (72), a central vacuum system using 1 1/2" I.D. flexible hoses was employed. The exhaust hoods were made of lucite or transparent material and were tailor-made to surround the cutting tools and much of the work. Exhaust volumes vary from 120 to 150 cfm with inlet velocities of 11,000 to 14,000 fpm. In another application (73), a portable orbital sanding machine has been fitted with a small exhaust duct sur rounding the edge of the plate. A fitting has been provided to connect this to the flexible hose of a standard domestic vacuum cleaner. VS-801 in VS-30G, 802. 803 and 804 illustrate a custom-made line of exhaust hoods available (74). The re quired air volumes range from GO elm tor pneumatic chisels to 380 cfm tor swing grinders. (See Table 5-6-1) Due to me high entering velocities involved, static pressures are m the ranve of 7" to 14" of mercury 05" to 190" water gauge). This high pressure is necessary to create the (ugh capture ve locities at the dust source to control the dust. TABLE 5-6-1. EXHAUST VOLUMES REQUIRED FOR LOW VOLUME-HIGH VELOCITY SYSTEM I.D. Plastic cfm Hose Size Disc sauders, 3-9 inch diameter Vibratorv Pad Sander - 4 : 9 Router, 1.8"- 1" Belt sander 3" - 4,000 fpm Pneumatic chisel Radial wheel grinder Surface die grinder, 1 4" Cone wheel grinder Cup stone grinder, 4" Cup type brush, 6" Radial wire brush, 6" Hand wire brush 3x7 Rip out knile Rip out cast cutter Saber saw Swing frame grinder 2 x 18 Saw abrasive 3" 60-175 100 80-100 70 60 70 60 90 100 150 90 60 175 150 120 380 100 l" - 1 1.2" l 1 4" 1" - 1 1/4" 1" 1" 1" 1" 1 1/4" 1 1'4" 1 1/2" 1 1/4" 1" l l 2" 1 12" l 1 2" 2 1.2" l 1/4" The dust is conveyed at high velocities in small diameter flexible hoses ranging from 3/8" to 2" I.D. Exhaust is provided by a multi-stage centrifugal turbine capable of producing static pressures of approximately 12" of mercury 1163" water). A single stage positive displacement axial flow ex hauster has the advantage of generating a vacuum in the range of 22" of mercury (299" water) below atmospheric pressure. The fabric collector can be cleaned by a simple, manual valve which admits air into the clean side of the fabric bringing this side of the fabric to atmospheric pressure. Since the dirty side of the fabric is at a pressure far below atmospheric, this causes rapid air flow through the fabric and provides reverse cleaning. i 410422 0441 G. L. WILKINSON ELECTRODE SUPERINTENDENT TENNESSEE OPERATIONS IA r - "! -7 TO DR. BERTRAM D. DINMAN MR. J. G. MORBER PITTSBURGH OFFICE 1980 January 15 RE: RESPIRATORY PROTECTION - LIMITS ON USE /IN TENNESSEE J OPERATIONS SOUTH PLANT ELECTRODE We have one job position where mandatory respirator wear is required. The Mixer Operator, Bldg. 31 Green Cathode facility, job classification 3rd Class Equipment Operator Cathode, must wear protection for pitch volatiles approximately 4 to 4-1/2 hours/shift. At current production levels this facility is running 15 shifts/week. Other factors worth consideration are (1) there are 3 men in this classification in the same building which would allow a rotation of Mixer Operator assignment during the shift to stay below the 4.4 hour limit you mention and (2) R/A funds have been approved for fume collection in this build ing with completion expected by fourth quarter 1980. Hopefully, this equipment will eliminate the requirement for respiratory protection. We will keep you advised of changes when they occur. G. L. WILKINSON GLW:jm cc: R. E. Ray, Tennessee B. M. Starner, Tennessee W. S. Stroud, Tennessee ALCOA 410422 0442 sr-4963