Document b5OQGZa9L0GO0ymgDgXax7Jdo

The RUBEROID Co. HYDE PARK, VERMONT 05655 For Attention jfr. H. J, Holloway - So, Bound Brook Copy to Ksssrs. Matthews, Matlin, fcGsttrick Dait May 3, 1967 Reference Subject DRYER DOST CQLLSCTCE - TffiMMIT This la to bring 70a xsp to data on oar progress oncoming the above. Vo haro talked with Mr. of Vhsalabr&tor, to eanflra coot estimates. It appears tho coat would be nearly the oamo whether vo reconditioned oar oxlating unit for one dryer and porchaaod a naw unit for the other m parchaaed one largo unit for both dryere. this vonld be $UOfOOd to $120,000. excluding any building required to hooae tho volt* Ihia alao allows only for exhaustingthrough aaa Dryer HLdg. roof, aa at prevent. Stacks, to carry the exhaust above tho alll roof to prevent fanes from ontoring tho sill bldg, in the ramer when windows are open, would bo an additional expense. Vo viaitod throe of tho asbestos producers in Canada to learn vhat they ere doing to control thoir dryer oxhanat. JM gave a a copy of a report they nada to a eub-ccoaittee of tba QJLJf.1. (a copy of vhich is anclosed). Aa can be seen, they hare tried many approaches. I foal some of the teats are not conclusive as there ware obvious problems caused by conditions vhicix could have been corrected bat were not before the equipment vu rejected. For example, Carey la operatingnulticlonea and report fair .success. JM possibly did not have the space to properly then and obtain equalised loadon each of the BultlclcDss or did not feal the cost of such installation vaa justified in relation to the possible final efficiency that could be obtained. Cta the Dustax unit Hook, JK's dost control engineerf admitted the tests vara not canelusive and that they might have been successful if they had used additional heat to prevent condensation. They are now going to install e vet separator, an AAF Type V Botocloae on one dryer (20,000 cfa) and a Hheelabrator bag filter on another for full scale tests. They have MgM hopes for the Rotoclone because of the simple installation and low water requirements. They feel the exhaust, 0.02 grains/cu.ft. will be acceptable for their requirements. (In the center of the town) They plan to do bore research on handling the sludge but at present are considering a vacuum drum filter pre-coated with diatoaaceons earth. Discharge of the filter, about hO% solids, will be to their tailings systems Thqy feel certain the bag filter will work and will definitely operate in acceptable limits. They are concerned about operating maintenance costs, especially if the units must be kept on stream 100 of the time, in fact spare units aay be required for maintenance to obtain 100JS on stream, operation. The RIJBEROID Co. HYDE PARK. VERMONT 05655 For Attention Mr* K. J. Pol 1 QL-ny - So, Boond Brook Copy to Date tey 3 1967 Reference Subject PAS" 2 Is operatise Wbeelabrator bag filters. They do sot keep there on stress 100;! of the tins. They bare encountered high operatise sad wlntenance costs and these Bight be higher If they bod to be leapt w stream felntfltWM is no: achBcjolad when crous sro available sod other wintonanrc work takes precedent. Halts are ty-passed when sot operable. Gere? is operating Hiltlclcne wits. Each of three dryers is agteasteri thru a bask of 8, shoot $0" dla.,0 cyclones, they report so problsss bet do hare to occasionally clean the cyclases as condensation occurs at tiaso. We do not bare data on the grain loading of the discharge. ft*aa our Icreatlcatlon, we are new eenshdering the following approach to our prohla&t 1. Beplace cur 9* dia. cyclones ( one on each dryer) with twin cyclones of the JU design (see attached copies fra print) She Jit report givae the dischazge at $0 lbs. par hour per twin wit. Book they obtain as low as 50 1bc. per hour. 2 3tiaate we ere now discharging in the ardor of 303 lbs. per hour fra each of our cydwcs or 600 lbs. par hour. The 53-83 lb. per hour esdeast (10 dryarc 533 to 830 lbs./lir.) froa JM's stocks appeared quite dean (as it probably cansiste of only the finer particles) and there was no aocirailatlm of dost on the buildings end grootkis In the area. Poesihly, we will find 50 Ihe. per hour per wit (100 Ihe. par hour total) acceptable far oar raote location. n twin cyclones wet bare a tight air lock. JH also sates than* of 2/an plate and uses no liners to obtain as nooth a surface as possible far flow within the cyclone. Ve are handling about tbs ease voluae of air and our aristing fans should hrwn the 5n P-3, across the twins. 2. Install a stack or atacke to above the aUl roof. (See attached print) Cds will xscxnre the exhaust saffirtantly ao the objectionable ftaes will not be able to reenter oar sill building as they at tinws do bx. Zt will also help disperse axy flnc dost so it would not settle around the plant aren. JK did report wteriol build up on the Inside of their stacks doe to condensation. This flalas off and blows out of the stack '~gr'Tr,T^ a alight acciiatlntlm of these flakes In the aorroundlz^ The RUBEROED Co. r- HYDE PARK, VERMONT 05655 For Attention Mr. fi. J. Holloway - So. Bcnmd SrooJc Copy to Dote jty 3, 15^7 Reference Subject This sdotlnn should eliaimte all ebjecttcmhle nuisancee froa our dzyera in the general plant area. It Bight veil be all that would rrar be required for control of our dzyer exhaust as vs are In such a reoote area. Cto the attached nap* Z have atotrher.1 la cur approxboate property Hobs. Except for the higlaay (eo called State-Aid road) which n&s thou our property North L South about 2/h Bile from the xdll* the nearest adjoining property* is 1/2 lie fra our dryers. The nearest buildings are a little orer a Kilo North aai a Bile South. The nearest Village Is it alias mgr. 3. If* la the Attuxe a cleaner stack exhaust Is required* It would seen that another stage of high, efficiency cyclones or aultidonoe Bight be satisfactory or, If accessary* seen wet separators. She proposed 1st stage of todn cyclones would be beneficial* if not necessary* to ary such Installation. We are planning to proceed with cost estlaatss on the above progiwa and would appreciate your comsote and suggestions. She dust discharged has no Tains. We probably experience sons lacs of Talnes now with our present inefficient cyclcoos. Also these cyeloaos occasionally ping when a piece of worn nirtnc breaks loo&e end we loee appreciable ralnss for a short tine uatil the pins is noticed end the probiaa corrected. ^n/mr (Sid. to Mr. Holloway only) J. tMlrrrre -'tr