Document 9J2y5Jar7xn5xjjZgbvKxKxZ3

FILE NAME: National Gypsum (NG) DATE: 1953 July 6 DOC#: NG066 DOCUMENT DESCRIPTION: Internal Inspection Report - Air Samples in the Asbestos Plant in New Orleans July 6, 1953 Rational Cyprus Canpcuy . 325 Delaware Avenue ufialo, Rev lork Attention Hr. H.C.H. Pollard, . Safety Director Genti esent ' ^une 9 and 10th, the vriter took air aasoles in t-.e Asbestoae plant Rev Orleans. Counts vers unde vith the followin' re- SkllwSt * . "** Sanple No. 1; Taken at the regrinding atchine platfom. - 55,200,000 particles per cubie foot of air. 1 test aide with a veloueier indicated . a ve*ocity of air over the hood iron the platfom fen of 550 feet ' . ^ r "nute. The flow of air into tho hood is only 220 feet~?er a-nute. (See sketch Ro. 1) The ermust cyatea would be such sore effective if the use of the platfom fan was discontinued. HUE?. 7LC0R HO. 2 vanp*e Ho. 2. Taken in the aisle baek of hopper while asbestos was fed into bloyen (See sketch Ro. 2) The count was 3,320,000 particles cor cubic foot of air. Here again the disturbance caused by the* plat* ora fan appeared to be the priaary cause of dust. Scapls Ro. 3. Taken at the loading platfom of the beater. The majority of t..e dust originated at the spout of the ceneat elevator, nicked up by the air velooity of S50 feet peminute created tv a* clut- - ;or? 7h* dust C0Q=t vua'22,240,000 particles per'cubic foot of air. Sanple Ho. X. Taken in the regrind bin. The count was extresely high - 1,696.COG.X0 particles per cubic foot of air. Two cen were exposed to this dust ' concentration for about 20% of their tine. At the north door of this bin an incasing velocity of 150 feet per ninute vas indies*** dli *"* '"tfor3 t the beater. The vest door "* of tue bin indicated outgoing velocities of up to ?5 feet -- .ninute. This flow of air carried dust frca the regrind bin'out into the general floor urea. t Semple Ho. 5 Tuhen in the aisle Juot vent of the beater cod another bo?;er. The count vr.s 10,720,000 ptrticlss par cubic foot of sir. It appears that ths asst of this duct cones fren the rocriadbin. ffAV DEPAITTCrT Sample Ko. 6 Talcaa at the flaws aa indicated on sketch Ho. 3, and the count vas 3,3*0,000 particles par cubic foot of air. Scrple Ho 7 Taken betveen tbs paw lir.ss nt point indicated. Count vne 6,219,030 particles per euiio foot of air In this dertrtcent t.hs high volociiy pl' tfora fans appeared to nullify to foie extant the efficiency of the axbeust eystesf. COHCLUSIORi -- Vith the exeoptien of the grind plntfora and the grind bin . the eouuta do not eea excessive. Uoverer, the.ar.ount of asbestos ^ that can be safely tolercted without injury has not been`clearly " , ^esUblishsd. Thorefor, ths safest procedure io to eliainute cs . *. .' jauch net as possible* - ' Three recosssndations would therefor be in order, es follow? 1* That all platfom fens be eliainated at points where the flow of tir create-s dost or ainiaises the effect of an exhaust eyctca. 2* i . 3 ' . That soae netns be devised to renove ths grind enterial frea the bin without the necessity of non entering tha bin. A crew conveyor night do this ' That roof ventilation be provided to prevent the flow of duat-ls.dan air across the uorbing areas and the breathing sons of the operators. T M s should also serve se a terns of lowering the excessive teapemturas. noted In ecae ereae. Thanking you for this opportunity cf asrvinj you, and hoping these findings and suggestions arc helpful, we rsaain, Tery truly youre, LiTZSACS A EAISZ3, IK. abh.Ja A.3. Hoftiscer Safety Director