Document 3epKDK4G3BBZBQR7KKr9pGOG6

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 A r, J' [^-piA N n Frs^ 1 '^ ^ E X H lB n ^ , \ h jWier&P- Ju ly 6, 1953 Rational. Gypsua Ccapauy 325 Delaware Areaua B uffalo, Rev lork Attention Hr. M.C.M. Pollard, Safety Director Gentlemen On June 9 and 10th, the v r ite r took a ir samples l a the Asbestoae plant Rev Orleans* Counts vers made vlth the following r sultat Simple Ro. 1 ; * Taken a t the regrinding machine platfora. - 55,200,000 p articles per cubic fo ot of a i r . 1 te s t nude vlth a Telemeter indicated a Telocity o f a i r orer the hood from the platform fen of J550 feet per ninute. The flo v of a ir into tho hood i * only 220 feet per ninute. (See sketch Ro. 1) The exauet system vould be auch core e ffe c tir e I f the use of the platfora fan vas discontinued. 'm uer plcor ho. 2 Semple Ro. 2 Taken In the a is le back of hopper vhile asbestos vas fed into hloven (See sketch Ro* 2) The count vae 8,320,000 p artic le s por cubic foot o f a i r . Here again the disturbance caused by the platform fan appeared to be the primary ecuse of dust* Sample Ro* 3* Taken a t the loading platfora of the beater. The majority of the dust originated a t the spout of the cenent elevator, picked up by tho a i r relo o ity of S50 feet peralnute created by a p la t- _ foza fan . The dust count vas 22,210,000 p artic le s per cubic foot of air* Saaple Ro. X* Taken In the regrind bin. The count vae extremal7 high - 1,696,000,000 p a rtie le s per cubic foot of a i r . Tvo cen vere exposed to th is dust ' concentration fo r about 20 of their time. At the north door of th is bin an incoming Telocity of 150 feet per ninute vas indicated, due to aetion of the platform fan c t the beater. The v e st door of the bin indicated outgoing veloeitiae of up to ?5 fe e t per ninute. This flo v o f a ir carried dust frea the regrind bin oat into the general flo o r uree. - 2- Seppie Ito. 5. Tuken la the a isle Junt vest of the beater and another hop.'er The count vr.s 10,720,000 particles par cubic foot of * i r . I t appears that the a ss t of this act eonac fren the roc-tad bin CAV SrPAH-TOT Sanple So, 6. Taken a t the flaws ao indicated on sketch JTo. 3 ccd the za^nt was 3,3-0,000 p a rtic le s par cubic foot of a i r . Saaplfl Ho 7 Taken between tbs paw li r a s at point indicated Count wns 6,2i0,000 p - r tiilo s por cucio foot o f a ir In th is dertrtnent th* high o lo d ty pl' tfora fans appeureJ to n ullify to aia extent tha efficiency of the axheust eystesi* CMCLUSIOSi -- Vith tho excopticn o f the regrind platform and the retried bin . tha counts do not sees excessive lloverer , the .eciount of nsl'ssto ^ th at cn be safely t a l ere tod without injury )v-s not Ivi*a clearly . . ' .^established Thorefor, ths iaf-.it procedure ifl to eliminate cs jsiuch act a s possible Three r coxaeolations would therefor be in order, es follows! 1 That a l l platform fsn s be e l i s i nated a t points where the flc-w of d r erssteo dost or a ia i d a e s the effect of an o.ch*.ust eyste 2 That son netns bo devised to reoove the TV^ricd en te rial frea the bio without the necessity o f non entering tha b in . A screw conveyor night do tuia . 3* That roof ventilation bo provided to prevent the flow of dust-1-dan s i r across tha working areas end the breathing cone o f the operators* This should ciao serra aa e stems of lowering the exccseivo taapomturos. noted In eoao areaa. Thanking you for this opportunity c f scrvicr you, and hoping these findings and enggsations are helpful, we rea*.in, Tery truly yours, L17ZSAS & H1IS23, IliC. abh.Ja 3. Hoftieser Safety Eireetor