Document a4zGv5mj6o405pL4rEQa4qMay

in Attewlar.coi Mlnutoa of tho Ar.biiatos To*til Ins It tutu Air Mygiono ar.d Manufacturing Coranlttea Vi. C. Atkinson P, D. Cannon H. M. Jackson A. E. Hay J. L. Mitchell J. E. Palm R. B. Smith Johns-Mnnviliu Corp,, Hanvillo, N.-J. Johns-h'nnvillo Corp., Jhr.villo, N. J, John3-Manvillo Corp., New York City Kcacbey L Mattison Co, Southern Asbestos Co, Rayb93tos-Hanhattan, Inc,, Kauhein, Pa, Raybeatos-Manhattan, Inc., North Charles' . S. C, Guest: llr, Haurico LaChanco - Thotford Industrial Clinic Tnetford Mines, Quebec, Canada Tlia lolloping itess were discussed: 1, Dust Sar.pling ' Mr. Hugh Jackaon reported on tho progress of tho tests that Jchno- Manvillo Corporation is conducting to establish a correlation botveen ths Standard and Midget Groenberg-Snlth Impingors. In the past, tho two inplngars have taen used interchangoably, Tho test3 to dat9 nado by J-H indicate that counta mode with tho Midgot Impir.gcr nro running slightly higher than counts nada with the Standard Inpinger, The tests aro made in tho plant, in areas in which the dust count will range fl'cnn 3 to 5 m.p.p.c.ft." Throe technicians are counting tho slides in cm effort to reduco tiny errors in counting techniqua. Hr, LnChznce -roported that a few years ago similar ccnparisor.3 waro made by J-M in Canada and the QJUllJt, and that th9 rooults chocked within 2 - 32* Those tcst3 wero conducted in areas having relatively high dust counts, . Hr. Jackson stated that the U. S* Rubber Company is cooperating in tho testing program and that any additional participants would bo vole one, Mr. LaChanca stated that ho would bo glad to participate. 2, Continuous Dust Sampling Mr, Jackson reported on the results of tests rada with a continuous campling and rocording instrument in cooperation with tha U, 5. Public Health Service, It has bean found that tho workers actions greatly influar tho dust courts and that after a short tir.a a correlation could bo estab lished botwoen tho dust count and tho worker. ltr, Palm reported that they have rocontly taken dust counts in areas in which tho windows aro opon and find that tho counts cro higher than thoss teken in tho eamo nroa with tho windows cloned. This was diocussed by tho group and tho following points were brought out: 1, Dust hoods nrti not ao offoctivo when windows aro open bacauso of increased cross drafts, _ ; ` 2, VJhan windows aro open tho humidity io usually liigher which causes h olight reduction-in dust collectr.r capacity. 3, Open uindows create drafts which pick up dust that has settled on horizontal surfaces ouch ns roof trusses, machines, otc \ 3. Induetrial Health Mr. U.tchell askevl if it was posoiblo to distinguish betvoen rock duat and aabastos fibor dust when counting particles. At tho present tina, rock dust i3 not considered harmful. Vihen counting dust particles with the aid of tho microscope, it is r.st possible to differentiate betvs'j various kinds of dust. Hr. Jackson roviuved hov the allowable limit of 5 nillion p.p.c.f. was established. Tho 5 million p.p.c.f. is a carry over from tho qucr,ts industry and oeems to bo confirmed by clinical experience. The break point of particlo also of 10 microns was established at Saranac and has been cdoptod by muny authorities who bolieve that partidos/ovqrSlO rdcrons iro not harmful to hircans. u. Dust Collection and Suppression N ____ /> Mr. Atkinson advised th9 following: (a) The Skinner electric valves shown on Print //A-3320-2a titled "Proposed Viet VJarp Weaving Sprocket and Chain Spray" are not necessary. He nloo advises that tho cpray nozzlo is installed back of tho harness and that a pan which is the full width of tho loan io placad under tho warp. . (o) Throttle valves should bo instolled on both lines and tho lino loboltd "air" should bo changed to "water" and vico versa, (c) Tho water for tho nocslo io drawn from a small tank on each loon, (d) Tho results obtained with tho spray nocclo have boen much hotter thta thoso wit!: a water roll and pan. Mr. Atkinson also reported that oomo experimental work is being done with tho nocclo used on tho looms to direct r.oisturo laden air toward the creels. Mr, LaChanco advised that tho Whselabrator dust colloctor is uood with oatisfactory results in tho mines end that in few cases Rayon bags ha boen used v.'hore cotton bags did not havo quite enough capacity* Tho committee discussed the advisability of oxchanging information on ho6cT designs with tho Asbestosis Kusoarch Council of England. It is proposed that member companies would prepare sketches of existing hoods ouch as hoods on cards and that these sketches would bo exchanged for comparable skotcho3 from the Council. Dr. Shaw will contact the Council odvioins then of our thoughts. A brief discussion was held on methods of delivering ctock from coiling condensers. Various schemes havo boen tried but none aro camplotoly oatisfactory. Ono company io experimenting with a pivoted inclined conveyor whoso pivot point is at. tho condenser. The conveyor io positioned to discharge into a otock truck on either tho right or loft onds of the convoyor. 5* Now Equipment, otc. A circular from the Wiretyzer Corporation, East Paterson, , J., wiiich described a bag slittbr end dumper for asbeotos fiber wao circulated among tho members. It was also announced that the Wilkra ' Ccmnanv is now workinrt m a bne dumorr which will bo outtablo for oressurt ^N A now ...a^fiiina cull.n "Air 2ni;ineurlni;,<, published by Air Enrinaarin" livnineoa f!out Puol:shine Ccrapany, li50 Wost Fort Stroat. Detroit 26, rdchig is now being published. Tlio purpose of the mcgacino is to cover tho field of heating and ventilating, ud3t control and removal, end air pollution. Subscription price W.00 par year, fch.50 for two years. Agenda for Next Hooting 1. Discussion of dust collection. 2. Further discuss exchango of information with tho Asbsato3la Research Council. 1 . 3* Plant Safety Programs. , Respectfully submitted. A. E. May, Chairman Air Hygier.o and Manufacturing Corrmittea