Document xk1j2MJy5MGJJNQgzJEK5weg

COPT - (MA - 11/2/53) INTUSTRIAL HTGIEKZ FOUNTATI OK OF AVE-JOA, INC. UliOO Fifth Avenue Pittsburgh 13, Pa. I PiAINTffPS - i^,JEXHWT^: f^^r-4- 4-- -- > November 5, i.251 JIt. X. K. Ayer, Engineer United States Rubber Compaq fctark Hills - Reid Kills ' Hogansvilla9 Ga. 4;-4 * fr\r Subject: Asbestos Dust Control Program at Hogansville Plant Dear Hr. Ayer: The followinr is a summary of the salient Doints on which I consulted with you at Hcg&nsville on October 25 and 26. I inspected the automatic hoods you have installed on some 13 of the looms and found the installation to be in accordance with our original recommendations. The measured air flow amounts to approximately 350 dfm. per loom exhausted through a slot disposed just above the warp threads bach * of the harness. v0u arc to be complimented on the ingenious mechanical arrangement whereby pneumatic cylinders raise and lower the hood automatically as the machine is stopped and started. While it was not contemplated that dust counts would reflect the improvement due to such a partial installation as this, (and in feet this was noted in our report of Karch, 1950,) nevertheless the dust counts that have been routinely obtained before and after the installation do indicate a marked improvement in dust control. From February tc June the dust con centrations ranged between 5 ana 9 million and since then, with the exception of one August dust count, they have raiged between 3 and 5 million. With the aid of strong illumination and pcsitionir.3 of the exhaust hoed at varying locations above the web, we were able tc demonstrate dramatically the effectiveness of the exhaust in removal cf fine dust, not only that originat ing at the top of the web, but also that in regions below that level. Ir. s.\crt, this installation has fully met our expectations. Control of fly originating at the front of the machine was not contemplated and a visible escape of moderate amounts is arparent. Questions concerning this source were discussed and we arreed or. the necessity for distinguishing between the fine dust as disclosed in dust .counts which is related to considerations of health, ar.c the nuisance aspects 'of-fly. If at seme later date it be deemed advisable tc attempt .suppression of the latter by supplementary exhaust means, it will be recognized as, principally .4 reduction in fly nuisance. v. Ur. X. K. Ayer -2- Ncvenber 8, 1951 The brick dust house into which the exhaust system discharges acts as a sttlir.c chamber and the effluent air discharging into the .pen at reef level contains an almost isoerceotible quantity of dust. In^fcart, If recircu- "lati.cn into the werkroem were not contemplated, one could conclude-that the present decree of cleanliness is satisfactory for outdoor discharge. It is uch smaller in amount than that in the discharge from the ettri reo* exhaust system. '' ' ' ?e approve of your plan tc install a small *heelslrator cloth bag dust collector anc one of the Air Mat filter, operation of which units will afford a rood oo-ertunity to decide on the unit best adapted to your needs. The facts which are somewhat indeterminate at present and which warrant exoericantal installations of the type planned are: (a) the ease with which the accumulated cake of material on the filter can be dislodged (b) the pressure drop at the end of one-half ds^s operation, in relation to the site (filter area) and (c) the effectiveness of seal between dusty and clean air sice cf the filter as ceteznined by dust counts in the effluent air. - Card Room Since our last visit additional exhaust connections to the spaces under the carding machine enclosures have been installed. An inspection cf dust concentrations for the ten months of 1951 indicate levels consistently within the range of 2 to L million, averaging around 3 million. This rerresents excellent dust control when compared with concentrations prevalent in ether leading asbestos textile clants as tabulated in our urevicus report. Fcr rossible future reference we note that such dust as escapes appears to oririnate in large measure from the comb of the finisher card. As outlined in our p^vicus re'ert, it wculc seem feasible to install an exhaust slot directly abeve this ccmb. Snir.r.ins Hoorn Lust counts made in 1951 indicate a rar.re in dust ccr.ce :tratior.s from 3 to 5 million. These are co-parable with those encountered elsewhere in tr-e industry. A*t*r.rts have been mace tr reduce cust ccncer.tr .ticr.s and fly ir. s**inninc reems by installation cf exhaust below the goir.r.i frurcs a: behind the tebrins. -one of these methods have teen successful i; : effector-: major reduction in dustiness, tnis because cf the large area ever which the source:- are disposed. roster Sincere vv '* Ccncer.traticns of dust in the wincing reem are consistently lew, i.e., below 3 million. Corsaents that have been made concerning dustiness j.n tnis area refer tc fly which may be cco.criscd in large part of cctior. fiber. The dustiness in this area is the lowest of all departments. Exhaust systems have been acplied to Tester winders in some other plants but in view cf the charac teristically low cust concentrations their value is not clear tc the writer. 117 Li kr. K. K. Ayer -3- Noverier S, 1951 Picker Peer. -* o" > VM n.o TV dust ccur.t record for the picker rocr. shews concentrations ir. the r5?e primarily below 5 million, a narked reduction-from early in when they fell principally between 5 and 1C sillier.. i'-T.. - ` X *' ' . * The accoT.plishr.ents outlined above represent gratifying prorress ir. the oust control nrograa. Tour plant witr. the co.T.pletion'f the exhaust system for the werkreons w~: 11 rank with the best in the industry with which we ere familiar. We were pleased to note that the Georgia Livision of Industrial .Hygiene will carry out another dust ount survey for you within coming weeks. We would be interested in receiving a cony of the report when it is available. In the meantime, we shell be pleased if you would keep in touch with us ir. the further development of the dust control system for the looms. Very truly ycurs, W.C.L. Heme or. Engineering director WCIH/vsc V OiA - 11/2/53; ISEU5TSIAI BS5I2K2 FCrSTATITN CF AMERICA, IKS. liliOO Firth Avenue Pittsburgh 13, ?a. I.'evember c, 1951 VXHWT *r. K. Ayer, Engineer Vaited 5ts.tes Rubber Ccotany Star*? ilills - Reid Sills Horansviile, 5a. Subject: Asbestos Eust Control Program at rlccansvillc Plant . rear ar. Ayer: The following is a summary of the salient ooints or* whicr. I consulted with you at Hcqansville cr* October 25 and 26. I inspected the automatic hoods you have installed op-scse 13 cf * the Icoos and found the installation to oe in accorcance adth our original recommendations. The measured air flow amounts to approximately 350 dfm. oer loos exhausted through a slot disposed just above the warp threads back cf the harness. vou are to it complimented on the ingenious mechanical arrangement whereby pneumatic cylinders raise and lower the hood automatically as the machine is stooped and started. ' **hile it was net contemplated that dust counts would reflect the lasroveaent due to such a partial installation as this, (and in fact this was noted in our report of March; 1950,) nevertheless the dust counts that have been r^ut*nelv obtained before and after the installation do indicate a marked improvement in dust control. From February to June the dust con centrations ranged between 5 and 9 million and since then, with the exception of one August dust count, they nave raged between 3 and $ million. with the aid of strong illumination and positioning of the exhaust hoed at varying locations above the web, we were able to demonstrate dramatically tre effectiveness of the exhaust in removal cf fine dust, not only that originat ing at the top of the web, but also that in regions below that level. In short, this installation has fully met our expectations. Control of fly originating at the front of the machine was not contemplated and a visible escape of moderate amounts is apparent. Questions concerning this source were discussed and we agreed on the necessity for distinguishing between the fine dust as disclosed in dust counts which is related to considerations of health, and the nuisance aspects cf fly. If at seme later date it be ceeaed advisable tc attempt suppression cf the latter by supplementary exhaust means, it will be recognised as, principally, a reduction in fly nuisance. 5G VtM*' kr. *r. !C. Ayer -2- \'cve.-c 9=: The brick dust r.cuse : r.tc wnich the exhaust system discharges acts as 9 settling chanter and the effluent air discharging intc the open at rocf level contains an almost iapercectitle quantity of cust. Ir. :act, if recircu lation into the workroom were net ccnteo-latec, cne could conclude that the cresent decree of cleanliness is satisfactory for catdcer discharge. It is much smaller in amount than that in the discharge ?rca th care reen exnaust system. Te arpreve cf year plan tc install a small 'TheeIs rater cloth cag dust ccllector anc or.e cf the Air Hat filter, operation cf wnich units will afford a focc oorertunity to decide on the unit best adacted tc ; our needs. The facts which are somewhat indeterminate at present and which warrant ercrericental installations of the type clannec are: (a) the ease with which the accumulated cake of material on the filter can be cislccsed (b) the pressure drop at the end cf one-half car's cceration, in relation to the size (filter area) and (c) the effectiveness cf seal between dusty and clean air sice of the filter as determined by dust ccunts is the effluent air. Card Room Since cur last visit additional exhaust connections to the spaces under the carding macnlne enclosures have been installed* An inspection of dust concentrations fer the ten months of 1951 indicate levels consistently within the range of 2 to U million, averaging around 3 million. This represents excellent dust control when compared with concentrations prevalent in otter leading asbestos textile dents as tabulated in our crevious report* For ocssible future reference we note that such dust as escapes appears to originate in large measure from the comb of the finisher card* as outlined in our previous report, it would seem feasible to install an exhaust slot directly above this ccsb. Spinning Room Cust ccunts made in 1951 indicate a range in dust concentrations from 3 to 5 million* These are comparable with those encountered elsewhere in the industry. Attempts have been made tc reduce dust concentrations and fly in spinning rooms by installation of exhaust below the spinning frames and behind the bobbins, -cne cf these methods have teen successful in effecting a major reduction in dustiness, this because of the large area over which the dust sources are disposed* Fester Tinders Concentrations cf dust in the wincing reen are consistently low, i.e., below 3 million* Comments tnat have been made concerning dustiness in tr.is area refer tc fly which may be comprised in large part of cotton fiber. The dustiness in this area is the lowest of-all departments* Exhaust systems have been aopliec to Foster winders in some other plants but in view of the characterlstically low dust concentrations their value is not clear to the writer. ier. K Ayer ..cveacer richer Soon The oust count recrrc fr r the richer roc:: shews c'.rcer.trati-.r.s i. in the ranae rrisarily belcw 5 aillien, z a?r:*:ec rebuctitn *'rc= esrly in l"f' when they fell crinciraliy between r arc IT .aillicn. The acccxplishcents outlined z/cove represent *~*t; fyihr trerress :r. the rust orrtrol -iro?,r. Tcur riant wiV the completion ci the exhaust syste fer the wrr>rccas W 11 rank with the bes t in the industry with wrier we are faailiar. Te w*re -leased tc r.cte that the lecrria livisicn-of Incastrial Hygiene will carr* :ut another oust r ur.t survey for yea witr-ir* centnr weeks. **e wulr be interested ir. receiving a cc:ry of the retort when it is available. In the a*artixe, we r.sll be cleasec if you would keep ir. teuen with, ns the farther dev-leruent f the dust carrel systex :'or the locos. Vciy truly yours. T.C.L. Keneon Zr.^ineerin^ lirector CIH/tdc l