Document 44DnXYj6kXvOQmgGr5zxm08np

FILE NAME Manville JMA DATE 1973 DOC JMA080 DOCUMENT DESCRIPTION Asbestos Product Saws - Test Data 8680BD 8680BD D. E. Millier November 14 1973 W. T. Donahue N. W. Hendry 3W P. L. Larle R & D A19-9013 DUST CONTROL YOUR LETTER - SHALL 11/5/73 A. R. Marktus File 2 TOOLS Piia An extensive sucvey sucvey has been conducted on small tools with regard to dust control as used in the fabrication of the following Asbestos Asbestos Asbestos containing containing containing containing products products products products products TRANSITE Pipe Products FLLXBOARD Type Products MARINITE Products Asbestos Panela TRANSITOP Type Ace Panels - Asbestos Cement Cement Extrusions Dry Wall Joint Cerents Contacts were made with the following companies either through the marketing manager or the sales manager with control on their small tools and in all cases regard except to dust one the only dust control equipment was on their small belt sanders Millers Falls Tools Greenfield Massachusetts Mr. Shaw Tool Gen. Mgr Rockwell Manufacturing Company Pittsburgh Pennsylvania Mr. H. Williams Prod Mgr Mr. Callahan Sales Manager Hilwaukee Tools Brookfield Wisconsin Mr. Dick Randet V. P. for Marketing Mr. Robert Youngquist Mr. James Bassener Robert Bosch Corporation Droadview Illinois Mr. H. Cheshire V. P. Mr. Don Smith Nat'l Sales Mgr Skil Corporation Chicago Illinois Mr. William Foote Marketing Mgr Black & Decker Baltimore Maryland Mr. Bennett Sales Mr. Dick Campbell Marketing Mr. Don Ellison Engineering Pilot Manufacturing Company Torrance California Mr. J. Rawlins President D. E. Hillier - i November 14 1973 In addition to the above the following companies in exhaust systems for welding and sand blasting were contacted These companies make suction systems but none are attached to tools Pullman Ind Vas Cleanor Malden Massachusetts Hobt Manufacturing Company 3 Chio Empire Abrasive Equip Corp. Philadelphia Pennsylvania I also have contacted Symons Corporation in Desplaines Illinois who make a vacuum grinder for joints in concrete walls and Kett Manufacturing Company of Cincinnati who have a fiber glass sheet saw with a dust collector but is only usable for material up to about half inch thick The Symons joint grinder uses a Carbide tool and milla the joints in concrete rough Dr. Paul Larle has been working on this project for some time and has some imported equipment from England for dust control on B & D saw and for a portable drill In addition he has put a vacuum pick on a large portable Skil type saw for test purposes Based on Asbestos his tosta to date and the tests Research Council in England we conducted by the find the following CUTTING OPERATIONS Exhaust Without Using hand portable power and radial type saws without dust extraction gives dust counts from 20 to 200 fibers per cc depending on equipment type used and product being cut With Exhaust Using hand portable power dust extraction gives dust and radial bench saws with contents as low as below 5 efficient fibers per cc depending on equipment type used and product being cut This requires a good vacuum type exhausting equipment With Exhaust and Wet Using a good exhaust than 2 fibers per cc cutting is banned in Cutting system and wet fiber count is California and cutting it appears less obtainable However wet has possible shock hazards D. E. Hllller 37 MUI VITO bee 4713 DRILLING OPERATIONS Without Exhaust Drilling operations generatgeenerate and probably run mainly less much than less 5 cc dust without exhaust.a for most operations With Exhaust Drilling with the less than efficient exhaust wystems should readily meet 2 fiber per cc count under dry conditions without any water sprays SANDING OPERATIONS Many portable power sanders are however very little sanding is available with dust done in the field collectors The only operations requiring dry sanding in any volume is in gypsum dry wall applications mainly in the Eastern U. S. as in the Western U. S. a textured spray finish is popular which requires minimum sanding In sanding dry wall joints the usual sanding is manual using sand paper and a block however the new joint cements which are mixed require much a touching off of high spots less sanding is required In many There is cases just a great labor turnover in this industry so total exposure is probably minimized We are continuing to work on this problem and have additional equipment to investigate It is highly possible that we might have to recommend parts from various manufacturers and then interest some manufacturer in asserbling a complete unit to our specification Our survey work is almost complete and we are putting together some of our recommendations on equipment to solve these dust problems generated by use of small tools William T. Donahue  VI omni has Ae en asain Engineering Engineering Enginering Engineering Engineering Enginering MO ime Engineering Engineering te Engineering UM Enginering eee Enginering Enginering et \ fnateblne REFRACTORY ak REFRACTORY Pe ce REFRACTORY REFRACTORY PRODUCTS / J, em PRODUCTS TS M Products MARINITE Industry ALL M Representative REFRACTORY PRODUCTS INDUSTRIAL PRODUCTS DEPT DIVISION Application DUST CONTROL FOR PORTABLE TOOLS Hand power sheets A the tools are used extensively in the the method has been developed by P.L. field to work Marinite Earle's research group to safely ing The collect the dust generated in sawing drilling and sandkey to the system is high velocity volume air move- ment at the orifice Dust collection adaptors have been developed on this principle The keys to good dust pick up tions on each tool i.e. are 1 small pickup on saw 5/8 x 5/8 no orifice at key localarger with 50 cfm of air a differential pressure of 4-5 of mercury on suction side and 1-2 diameter hose no longer than 10 Ft attached from the tool to the dust collector intake Rockwell International Co. and Skil Corp. will provide a line of attachments for hand power tools made to M specifications Drawings of units are attached The user may make his own attachments using aluminum tubing duce results of and heavy less than aluminum tape 2 fibers on These attachments will proall units except the circular Saw A special cutting table that provides provides suction under the piece being cut must be used with the circular circular saw to meet the 2 fibers dust requirements This level is below the 1976 OSHA standar A drawing of this unit is attached A drill attachment is also available from Cape Universal Special velocity suction units air velocity to transport dust from are the Hoffman Hoffco 237 and are necessary to provide adequate the tool Two units recommended Spencer Model 190 Research is continuing study and evaluation on this project will be released as they are developed developed Details Neal James Mgr Engineering and Techgital Services OM | OM Manville Greenwood Plaza Denver CO 80217 CY " Sect.480-0 Part 10 Date 3/15/74 CancelNesw Pe ald oer te PRODUCING POWER AND TO CAPABILITIES OF PRODUCING NAME LESS DUST THAN PICK UP 2 FIBERS Tools Fitted with M Designed Units Rockwell International 10 dia - Circular Car . - ModeMlodelModel 310 -- 5700 rpm 74 dia - Circular Saw - Model 315 - 5800 rpm 4 dia - Circular Saw - Trim - 3800 rpm No detail sketch as yet Orbital Sander - Model 505 - 10,000 min Most U.S. Manufactured Drills 1/4 - 3/8 that have bearing boss 1/2 that have chuck diameter less than bearing boss diameter yet M design not implemented as which is available now Can use Cape Universal type Tools with Built Fitting for Bags -Remove bay and attach hose- Rockwell Int Belt Sanders - Model 500 - " x 27 Rockwell Int Belt Sanders - Model 503 - Smaller Stanley Power Tools Orbital Sander - Model 90-502 DUST COLLECTION SYSTEMS Hoftco - VAC 237 Hoftman Air FiltratioFiltrationn Day A Div of Clarkson 103 Fourth Ave. Industries New York N. Y. 10003 inc Buy Cusumano ( 212 212 677-3600 Spencer Model 190 Spencer Turbine Co. Hartford Conn 06106 Blair Alexander 203 233-3631 Tool Attachment Producing Companies Rockwell International Co. Power Tool Division 400 N. Lexington Avenue Pittsburgh Pa 15208 Skil Corp. 5000-33 Elstran Avenue Chicago Ill 60630 Dennis Huntsmen 412 241-8400 William Foote 312 286-2000 Cape Universal Drill Attachment Cape Universal Building Register Office P.O. Box 165 Products Ltd. - Exchange Road Watford England Telephone WATFORD 34551 Telex 262744 . 11.0 - VACUUM HOSE PICKUP FOOT ASSEMBLY . SEE SHEET ) . aw | 1/4 GAP REQUIRED BETWEEN SAW BLADE AND FACE OF PICKUP FOOT A~DDITIONAL SHIELDING | REQUIRED FOR DUST PICKUP - SEE SHEET 2 ' SHIELDING TO BE SEALED TO BASE AND GUARD DUST EXTRACTOR- PORTABLE SAW 10...DIA BLADE BLADE BLADE BLADE BLADE W 1 8 DIA CLEARANCE HOLES IN RS. et oe rote as cae ee e ee ot nea See ret ae Net | ee yp eS ! Fe pee Grenvrd etearts tote to) or H at . wn | wen A | | ware a $ | 21/2 -2 PICKUP FOOT- WELDED ALUMINUM CONSTRUCTION | | { | { DUST CUTTING SURFACE PICKUP FOOT SAW - 10...4DIA BLADE CUTTING CUTTING 80 % aww DILUADR ILUAR SAN FOAMED BARNELL TYPE > N VACUUM Log ; > OOO 96 REF ~~ | _ SUPPORT ANGLE TO FIT FLUSH WITH TOP EDGES OF BOX " 4 LUMBER 2 REQUIRED CAULK ALL 1" X " NORTON FOAM TAPE ALL AROUND UWAGO : AND ON SUPPORT SUPPORT ANGLES \ fica Y X46 X46 93 PLYWOOD PLYWOOD " WIDE X THICK PLYWOOD STRIPS 4 20G85 PIECES 9 2 PIECES CONNECTOR CONNECTOR SN, FOR 1/2 1.D. VACUUM HOSE BLOCKS AS REQUIRED SHEET SUPPORT PLYWOOD SECTIONSECTIONSECTION SECTIONSECTION x 1/2 40 93 PLYWOOD ws BS a oo on) \ 8 - PICKUP PICKUP PICKUP PICKUP UDES UDES UDES UDES UDES UDESUDES 4 . . CONSTRUCTION ALUMINUM WELDED CCOONSTRUCTIONN STRUCTCIONOSNTRUCTCIONOSTNRUCTION ALUMINUMALUMINUM ALUMINUM ALUMINUM ALUMINUM ALUMINUM ALUMINUM ALUMINUM ALUMINUM ALUMINUM CONSTRUCTION CONSTRUCTION 7 . + . ee * i . ep atid n ~~ 1m 10.0 i 10.0 1.1.0 1.1.0 VAGUUM HOSE & SAW BLADE . t f] E E E E E E E E E | ne 4 .4 od 3/8 r 1 i os \ we fou | soy GE ' a ' 1 oo ri q , 4 i 4 v ; ! . ot i id J ts i 2 01 .0 4 y | | 3 3 3 i i i AY, ve > ZADDITIONAL SHIELDING REQUIRED IN FRONT & SIDES OF SAW BLADE PICKUP FOOT MOUNTED TO SHIELD BOTTOM OF FOOT FLUSH WITH BASE 1" po ON 4 GAP FACE OF PICKUP FOOT TO EDGE OF SAW BLADE DUST EXTRACTOR- PORTABLE SAW - 7/4 DIA BLADE HOLZ CENTERS OFFSET AS SHOWN - .575 1.0 SEAMLESS ALUMINUM TUBING #can , me ~ - * Nog ae cn inte 45 45 SECTION A Z VIBRATORY SANDER . avtle fe. . / bony MOUNTING BRACKETS ~ TO ALLOW ATTACHMENT - EXTRACTION TUBES TO STING TAPPED HOLES 1. SANDER CASE "a aera | 1.D1.D. . VACUUM HOSE 7 DUST EXTRACTOR VIBRATORY SANDER 1 3 ' : 7/16 avy 1/16 1/16 VS 2 SLOTS VS WIDE WIDE SHOWN LOCATEO AS SHOWN SS \ EXTRACTOR HEAD COMPLETELY SEALED EXCEPT SLOTS AND TUBE ENTRY PN es, VA ee } Bae oo ar f [aopte WELDED yf MATERIAL 1.050 THK I ALUMINUM * CONSTRUCTION 1 , i. SSS i wo oe . ary, , poy MOUNTING BRACKET 7 CONFIGURATION PROVIDES { AMPLE CLAMPING FORCE ON DRILL CASE AND ON 1O.D. EXTRACTOR TUBE %, * \ \S \ TUBE TUBETUBE TUBE FLARED FLARED FLARED FROM IN 1.D. TO 1/2 0.0 ALUMINUM TUSING i 16S t = -1/2 " -1/2 Zam 11.D. VACUUM HOSE DDUST UST EXTRACTOR EXTRACTOR EXTRACTOR EXTRACTOR EXTRACTOR EXTRACTOR EXTRACTOR - DAILL SLOTS IN EXTRACTOR AS SHOWN ON DUST EXTRACTOR SPRING LOADED EXTRACTOR HEAD FOLLOWS DRILL ENTRY INTO MATERIAL SHEET 2 OF 2 7/16 DIA - DUST EXTRACTION ORFICE 138 | DIA _ | - - DRILL & TAPFOR 10-32 SET SIREN 3 PLACES ADAPTERSTAINLES 300 SENES SENES STAINLESS STEEL DUST EXTRACTOR DRILL - CAPE UNIVERSAL TYPE 8680134 8680134 Power Tool Division Rockwell International 430 Morin Luxington Luxington Avenue Znattulga Znattulga Pennsylvania USA +112 241-8650 Telex 966241 Cable ROMCO 15208 15208 25 April 1974 Mr. Milt Trosper Research Engineer Manville Research & Development Center Greenwood Plaza Denver CO 80217 Dear Milt Enclosed for your reference is a copy of the report on the Model 315 saw that you modified The report is from one of our field sales personnel As I said on the phone the information herein is not as complete as would be desirable but will have to do for the present The area blocked off on the report covers a completely different topic and need not concern you I am looking relationship forward between to a cooperative and our organizations mutually beneficial Very truly yours Hemin i.eye! . D. R. Wazenegger hee . Development Engineer Advance Development DRW Attachment CC D. A. Maniero 3556-02 Lf ? Y LOCATION | 271139 271139 eeess | :) 5 :) Rockwell Rockwell Rockwell Rockwell Rockwell MANUFACTURING COMPANY DEPARTMENT ie NAME ADVA CHEV UG ae AD aa EL DATE 3-16-74 -- JDN SUBJECT UNINALN W 315 11TH DUST ATTACHDENT) . .cc D. C. B. N. Huntsman Pittsburgh Tollar Atlanta Dear Dan MIGA MIGA be " ) ar . " ily 72 t Phy - i ~ 13 4 Although I gave you an oral report and evaluation on the Drywall Saw I am forwarding a more specific report in writing for all concerned 1 Ampricon Drywall Raleigh N. C. is a rather small operation Wilbur Matthews needs a saw with a vacuum to do a particular job in order to compete with the company with whom he once worked - and who has a modified version of a Drywall Saw Matthews liked the saw we used it in conjunction with a Spartan Vacun and in my judgement it picked up 65 to 90 of the dust This was under ideal conitions conitions He is cutting " thick Oypsum Oypsum a sample of which I sent you with the return of the test saw Mr. Matthews states his needs for this saw is immediate and he will need one for the present 2. Not being satisfied with this test and report I contacted a very large Drywall company in Raleigh Fartitions Inc. and talked to a Mr. Jack Webb who has been around the busines many yours I also wanted a pook at what they were using using They are using a Skil model 825 with an attachment made by Vaughn Wall Inc. Los Angeles Calif I understand the attachment ispatented The attachment is nothing more than a piece of round aluminum disc the size of the blade housing with a round hole in the middle at the blade arbor for a vacuum attachment In order to use this attachment they must take the entire Skil blade housing off cut two 3/4 pieces of plywood in an oval as the upper bladehousing and screw them together then they attach the aluminum disc to the plywood and side of the saw and plug in the vacuum It's a rather crude arrangement to say the least least Mr. Webb used our saw and feels a we should have an 8- saw instead of 7"for the capacity - b Vacuum port hole should be from the side of the saw and b attachment should cover the side of the saw completely down to the base and including the rear portion from from base to blade housing as we lost a lot of dust in this area Jack Webb wa not concerned with the trouble that would be encountered in changing the blade if we had a complete blade cover It would be better than what they now have For my ovaluation a Drywall Saw as I have dubbed it would not be practical as However I do believe a Drywall Saw Attachment as an accessory would be avery practical ides The proper contact for future test and evaluations would be Jack such Ou of Partitions Inc. Raleigh N. C. rather than Wilbur Matthews of American Drywall REPORT NO..404-132 NO..404-132 DUST CONTROL FOR FIELD FABRICATION TO FELT OSHA STANDARDS ( 7/11/74 & M.R. TROOTSTROKOTSK JOHNS- : ae AND ENGINEERING ENGINEERING CENTECENRTER Demart No. Date 404-132 July 11 1974 Title DUST CONTROL FOR FIELD FIELD ON ON TO HET OSHA STANDARDS SUMMARY This report makes no attempt to rewrite the accepted practice of dust control but rather to broaden and bring light to a neglected facet of dust control low volume velocity exhaust principles In general there are at present parce Nys of hoods used for dust control machine hoods top or canopy hoods and booths or enclosures applications Each controls dust emissions sufficiently for certain and in general cannot be extended into each others applications By the same token low designs are primarily designed to be tools utilized for field fabrication ials volume velocity pick up used with hand operated power of asbestos containing mater- Until recently hand operated power tools have been overlooked with respect to dust control A survey taken in November 1973 see Appendix I showed that in general the only dust control presently installed on small power tools was on small belt sanders Stateside only Hoffman Air Systems Division of Clarkson Industries Inc. with their rudimentary design have given any time to small power tool dust control Cape Asbestos of Norris Industries Rushen Limited of England see Appendix II and Black and Decker of Germany see Appendix II are developing dust control devices for small power tools however all of these are either of limited application or in the early design stages With these developments clearly lacking an accelerated program was initiated in July of 1973 to develop a system of dust control which would be OSHA accepted for field fabrication of asbestos containing materials Contents Summary Introduction Theory Pick Design ment Program Special Techniques Future Work dations Appendices Develop- Recommen- Bf Eale Reported Bf . P. L. Earle jes jmw See Distribution on Reverse Side Bfi ..t .k. 1. ee MANVILLE RESTADO RESTADO RESTADO MANVILLEMANVILLE RESTADO AND ENGINEERING ENGINE RING ENEGNGINIEERNINGEEENGINREERINIG NENGGINERING DEXTER DEXTER DEXTER e Report 404-132 INTRODUCTION Asbestos 4 x8 FLEXBOARD 10 x 12 1/8 to 2 00 TM 0 000 sq ft 11 oa) Varies to 30 sheets from % of the Asbestos MARINITE For Shipbuilding 4 x8 1/2 to 2 3,600,000sq ft ( bis 90 of the sheets Asbestos Cement TRANSITE Type Pice 2 to 36 dia 1/4 to 2 wall 120,000,000 lin ft about 10,000,000 pipe 1 Field Cut about 100,000 cuts Asbestos Cement 1 to 3 1/4 1,500,000 lin ft Extrusions ACE : 2 basis Type republic The above mount of considers the U.S. market only asbestos related field cuts are It is easily seen made each year % Field Cuts that a tremendous Research in Industrial Hygiene has shown that some respiratory diff- distrit iculties are caused and aggravated by exposure of the lung to asbes- tos containing dust within the respirable size range The respir- able size range is generally accepted to be above 0.05 microns in general of for aerodynamic diameter to a maximum 10 microns in aerodynamic dia- meter PartPPaarrittiicclcleessles greater than 10 micronmsicmroinscmriocrnominscrsons in aerodynamic diameter Not, are generally screened by a number of biological defenses prior to the bronchi The fibrous structure asbestos at first appeared to be an excep- CONFIDETAL tion to the above standard for airborne materials However particles having a fibrous form with a length in excess of 5 microns are generally used as the standard for asbestos containing dust The purpose of this standard was to classify those particle sizes which have an excessively long half life in the human lung It is M these particles exhibiting characteristics of longevity in the lung which are of interest to the design of an asbestos dust control system MANVILLE RESEARC Report No. 404-132 . vse we eee = se remy one s aeee eS. hemes Som 5 es2" y 2 saeween oe THEORY For a dust control system able dust associated with one of the following four to be successful in capturing asbestos fabrication it must objectives the respiraccomplish 1. The work area must be all swept with large volumes of air with sufficient velocity to prevent normal drafts drafts from carrying res- pirable particles away from the work area The operator tool and work piece must be allowed for and the volume of air handled must tion as a compensate for these obstructions Clearly Clearly Clearly this situacan only operate effectively in a closed closed environment such fabrication shop or industrial plant 2 On a smaller scale it is possible to enclose the tool and air sweep the tool and the cutting area This is not generally acceptable due to the settling rate of many of the larger par- ticles which coat the work area and will be distributed locally republicaton by the movement of the tool across the surface of the work piece In addition separate protection from dust emitted from below the work piece must be incorporated into the design or 3 A third recourse is totally shrouding that part of the tool distri which is generating the dust and evacuating this shroud with a high volume vacuum exhaust system Appendix II i.e. Cape Universal Total shrouding has several disadvantages such general as operator visibility of the work site Here again separate be for consideration must be given to protection from dust emitted below the work piece In addition a significant amount of Not operator technique must employed to achieve low dust counts 4 Finally in close proximity to the point of dust generation CONFIDETAL a pick up producing a jet of exhaust air with a velocity in excess of the generated dust can be introduced CONFIDENTIAL CONFIDENTIAL This low volume velocity exhaust system is the unique application of exhaust which uses small volumes of air at relatively high velocities to control dust emitted from portable hand tools M The control is effected by exhaustthienag ir directly at the point of dust generation The use of fitting custom made hoods is necessary to direct the pattern of the generated dust toward the orifice Capture velocities are relatively high but the ex- haust volume is low due to the small distance required i.e. usually less than one inch This method allows the application of local exhaust ventilation to portable tools which otherwise would require relatively large volumes of air and enormous duct work when controlled in the conventional exhaust methods MANVILLE JOHNS RESEARON RESEARON AND ENGINEERING ENGINEERING CENTER Report 404-132 Page 3 . ee meay Hn ME DT A a When designing a low volume velocity dust control system it is necessary to consides some of the Characteristics of typi- cal small dust particles A particle of 0.5 microns in diameter velocity has a terminal a particle of 10 of 0.001 cm per second in still air while microns in diameter has a terminal velocity of 0.3 cm per second the velocity is ictly proportional to the substantially per momentum vector of the particle breeze represents a velocity A one to two mile hour substantially in excess of 25 cm respirable per second It can thus be seen that the small par- ticles if not immediately captured will be spread by normal air currents throughout the work area and will remain suspended in the air for extended periods However when considering asbestos particles of 20 microns in length and under the Stokes Law consideration begins to have a noticeable effect Spherical particles having an aerodynamic equivalent diameter of 10 microns will reach their terminal vel- ocity without any really significant variations irrespective of republicaton their initial velocity or density The linear asbestos particles slow much quicker due to rotational energy being used rather than or kinetic energy This rapid attainment of terminal velocity explains several phenomena For example when a belt sander is observed we would expect that the particles moving at between 4000 and 5000 distrib feet tact per minute would immediately leave the point between the belt and the sander work at the Instead it last concan be readily observed that a very substantial proportion of reasonably good sized dust particles are carried around on the belt and thrown generalfor off not only at the first pulley of belt but indeed some of the the particles are carried fully 360 aroundpast the second pulley around In Not and ground back into the work by the a similar fashion when observing the typical abrasive saw in operation it can be seen that large quantities of the dust which is generated comes off the CONFIDETAL thought top of the saw in and around various portions of the guard Here again the obvious and still incorrect would be that all tangentially of the material would fly out CONFIDENTIAL CONFIDENTIAL from the contact point between the blade and the work piece especially in view of the CONFIDETAL fact that some high speed abrasive saws are generating particles with an initial velocity substantially in excess of 12,000 ft per minute Paraphrased from Hoffman Air Systems pamphlet and modified to asbestos considerations This consideration would be true only for a low pressure atmosphere Normally an envelope of air is formed by the friction of the rotating blade against the atmosphere This envelope in addition to the Stokes Law considerations makes the problem one MANVILLE RESEARCH AND ENGINEERING ENGINEERING CENTER Report No. 404-132 Page 4 = of limiting the dust exposure time from generation of the dust to pick up of the dust The phenomena of dust generation can be observed in essentially all fabricating tools used in industry The dust seen when observing this phenomenon represents a substantial proportion of the respirable factor which is the dust that constitutes a health problem The capture of this portion of the dust directly at or as close as possible to the point of generation before the machine and air currents have had a chance to spread the dust around the entire work area is the priniopal purpose of a dust control system The design calculations for low volume velocity exhaust systems are largely empirical In normal ventilation practice air is considered to be incompressible since static pressures vary only slightly from atmospheric pressure However in low volume high velocity systems the extreme pressures required introduce problems of air density compressibility and viscosity which are not easily solved In addition pressure drop data for small diam- republicaton eter pipe especially flexible tubing are not commonly available For practical purposes capacity to maintain at the exhauster shoulbde selected for least a 2.5 to 3.0 inches of mercury the pres- sure differential across a 0.5625 square inch orifice at the end of a 10 foot hose of 1 1/2 to 2 inch diameter Further discussion distrik can the be found in pipe should the appendix under vacuum systems Resistance be kept as low as possible flexible tubing of in less than 1 inch to 1 1/2 inch diameter should be limited to 10 feet or general less The main consideration in piping for such systems is to pro- for vide smooth internal configuration so as to reduce pressure loss at the high velocities involved and to minimize abrasion Ordinary Not fitting piping is to be avoided because the lip of the pipe or male fitting being of smaller diameter than the female thread CONFIDENTIAL presents a discontinuity which increases pressure loss and may be a point of rapid abrasion CONFIDETAL It must be emphasized that although data are empirical these systems require the same careful design as the more conventional ones Abrupt changes of direction expansions and contractions must be avoided and care must be taken to minimize pressure losses M PICK UP DESIGN Basic consideration must be given to the tool being fabricated with a dust pick up In normal operations where is dust being generated Refer to Appendix III After consideration of these basic rules and once the particle vectors see Appendix III are noted it is possible to fit the tool for dust control MANVILLE RESEARCHI AND ENGINEERING CENTER Ss ees Ses Fas S RReeportport NNoo.. 404-132 4044-132 04-132 Page <= Hood design is the most important single aspect to good dust control A badly designed and installed hood cannot be adequately corrected by tripling of the moun sound Hood design must en- tail all of the following Orifice size Flanging of the crifice Hood structure Operator acceptance Tubing structure Fabricshing Exhaust Fabricshing material vacuum system Orifice size must be given special attention since the velocity of opening the air stream is closely related to the size of the Re- ferring to Appendix III it can be seen that the volume of air dis- placed is drastically altered by the opening The development work was done using a 190 manufactured by Spencer Vacuum Co. see Appendix IV which has a surge point at approxi- mately 40-50 percent maximum volume It is desirable to design the pick up orifice area to lie within this surge point at a given vacuum republicaton pressure This will give a greater pressure differential at the orifice when or opposed to designing at or near maximum volume displacement Please note the table in Appendix III which shows different orifice vel- distrit ocities as measured by a VTP flowmeter see Appendix V Flanging or the type of opening is of importance since the coefficient general of entry Ce as well as the loss fraction of velocity head are affected for As seen below a plain duct end gives C = 0.72 and F = 0.93 while a well rounded entry gives Ce = 0.98 and F = 0.04 This type of entry Not is desired and recommended for all pick up design When this type is not possible use of a flanged duct entry is recommended Loss Fraction CONFIDETAL Type of Opening W2ezzzz2TZZT Description Plain duct entry Coefficient of Entry Ce . 0.72 of velocity head F 0.93 M (umeswaw areas ALLTEL Flanged duct 0.82 0.49 entry CIE Well Rounded entry 0.98 The above from page 26 ANSI Z9.2-1971 0.04 JOHNS MANIALLE MANIALE RESEAR RESEaAyR. AND ENGINEERING CENTER CENTER Page 6 Hood structure could be likened to a piece of modern sculpture in that it must be smooth graceful and constricting Again a proper hood must be fabricated for each tool considered and it must of tool being match smoothly with the inherent flow pattern fabricated Also it must meet operator acceptance the of weight visability mobilty must be clearly efficiently hose should should kept should be of work area and mobility mobility mobility mobility mobility The tooling site visible for the operator to work The leave the tool adjacent to power cord and weight to a minimum Tubing Tubing constrictions can be optimized by die cast techniques and the use of smooth connections which could be worked out between tool manufacturer and exhaust manufac- turer Several such connections are commercially available see Appendix V The material being type of lower seal fabricated will dictate used as prescribed under greatly the particular SPECIAL TECHNIQUES In general with all sheet materials some sort of lower seal must be provided when cutting with a circular saw The thickness and republicaton hardness will have to be considered If the material is hollow consideration must be given to evacuation of the hollow Greater detail to special problems will be found under SPECIAL TECHNIQUES or non The final consideration but not the least important is the vacuum system Much detailed research has been devoted to exhaust secure- dist ment of a portable system suitable for shop or field fabrication At present two manufacturers produce units capable of producing gen ral the necessary pressure differential Spencer Vacuum Company and Hoffman Air Division of Clarkson Units similar to the Spencer for 190 will produce sufficient vacuum to undertake any of the in- Nut cluded designs found under DEVELOPMENT PROGRAM and SPECIAL TECH- NIQUES All type vacuums tested at present cannot maintain CONT~JENIAL a sufficient velocity with the orifice sizes needed Two doubleheaded type vacuums have been found to produce the necessary CONT~JENIAL velocity However filtration considerations are incomplete see FUTURE WORK CONT~JENIAL CONT~JENIAL DEVELOPMENT PROGRAM TAI The use of small volumes to convey the laden of air at high velocities makes it possible air away from the source using small dia- meter lightweight flexible hoses generally inch diameter The operator thus has freedom of movement within the area required for field fabrication The control is achieved by exhausting relatively small volumes of air directly from the point of dust generation by using custom hoods shrouds mounted directly on the operator's tool Capture velocities from 2500 to 10,000 min are used Ex- haust volumes are however quite low permitting the use of very small lightweight hoods which do not encumber the operator any more than normal safety guards see photos This method has permitted the effective control of asbestos dust from stationary or MANVILLE RESEARCH AND ENGINEERING CENTER Paje 7 ag ema cn mem omesn ees hg aE Se oo pores So portable tools while utilizing only high small of air required by low pressure pressure a volume fraction methods of the volume This elimin- ating make up air and the additional heat required in fabrication shops With the low volume velocity syston it has been found that to meet a proposed reduction in acceptable standard from 5.0 fibers to 2 fibers exhaust hoses with a minimum diameter of 1/2 tain the inch and preferably 2 inch diameter are necessary to mainneeded pressure differential Guy Cusumano in his pamphlet by Hoffman Air Systems Division of Clarkson Industries Inc. states It should be noted that these minimum theoretical air volumes are based upon relatively low speed tools used ner on relatively speaking precision work in a very limited manPlastic hose sizes shown are assumed to be for operations where the hose does not have to exceed 8 feet in length In cases where high production opera- tions are involved the hose size may have to be increased and the air volumes upgarded by as much as 100 percent republicaton When using only a low volume velocity orifice , Guy is quite correct However with the addition of a properly installed hood or to direct the particles into or by the orifice it is possible to reduce the necessary exhaust vacuum pressures significantly In distri general a set of two orifices 5/8 inch to 3/4 inch in diameter with a 10 to 20 foot 1 1/2 inch diameter hose were used on the cir- cular saw pick ups designed The mercury lift at the end of the general 20 foot hose was 4 to 4.5 inches with one orifice and 3.3 to 3.6 for inches with two orifice openings as found on a typical saw pick up Not Initially we purchased a Rockwell Model 510 10 inch masonry saw equipped with a Hoffman Air Systems designed high velocity volume pick up attachment Upon initial test dust escaped from both the front and the side of the saw hood Dust counts were 10 M_CONFIDETAL to 15 fibers In order to meet a 5.0 fiber the saw hood was extended both vertically and horizontally with respect to the blade diameter as seen in photograp9h-s1 through 12-3 Appendix VI The larger particles had a tendency to tangentially continue their path below the saw hood The hood was lowered to meet the guide M_CONFIDENTIAL plate and a seal was formed which contained the larger particles See Drawing No. 13 Appendix VI Those particles continuing in the air stream adjacent to the blade are removed by a second orifice located approximately 30 forward of vertical on the blade guard On the original model this orifice MANVILLE RESEARCH RReeppoortrt NoNo.. 404-132 ettae ah Se eek so Reames on os cee eam mkpenne: es semua was aerodynamically smooched and enlarged to achieve the necessary pressure drop See Drawings 13 and 14 Appendix VI The Rockwell 510 as supplied from Hoffman Air Systems had an additional third vacuum port on the rear of the saw shroud This particular port was not found to be necessary see Photograph 12-3 Appendix VI Tests were again run on inch plywood as a lower 1 1/2 seal inch CORP R with a piece of 3/4 See Drawings 5 and 6 Appendix VI Results were favorable as dust counts were 5 to 6 fibers per cc Dust emissions were noted at the end of the panel being cut It appeared that the blade was acting like a fan and blowing dust out of the cores much like a naked cut See Photograph 1 and 2 Appendix VI To overcome this difficulty an end cap shown in Photographs 4 through 7 with vacuum attached was designed Photo a shows the masking tape seal on the opposite end of the hollow panel This formed an orifice of and allowed dust counts below 1.0 the out being made fiber Further in the CORSPAN discussions of this technique will be found under SPECIAL TECHNIQUES The vacuum system used was a Spencer Air System Model 190 Specifications republicaton and details of this particular vacuum system are contained in Appendix IV or A complete shroud was obtained from Cape Universal See Appendix II This shroud had been developed for use on a 9 1/4 inch Super Saw Cat HD 1215 manufactured overseas by Black and Decker This distril saw is available in the U.S. market This shroud can be ordered from Cape Universal in Watford England For further information general see Appendix II Test results of this particular shroud see for Drawings 15 and 16 Appendix VI led to acceptable dust levels be- low 5.0 fibers per cc The total shroud concept has several dis- Not advantages The first objection would be operator acceptance due to the totally limited visibility of the enclosed blade Abrasive blades may twist in cutting and the operator who cannot see the blade will have trouble cutting a straight line A second disad- CONFIDETAL vantage lies in the fact that in making the initial entry into a sheet material the vacuum ports or orifices are located in such a way that the actual orifice is really 3 or 4 square inches in area This reduces the velocity down to the point where there is very little actual dust control It is only when the saw is at least M 3/4 of the blade into any particular product that the velocity capable of capturing the emitted particles is developed It should be noted that the vacuum system used on the Cape Universal attach- ment ator is of the technique low velocity volume type will allow dust counts near 2.0 Considerable oper- fibers See SPECIAL TECHNIQUES In an effort to improve the pick up of the Cape Universal total shroud a high velocity volume vacuum source was added In cutting CORSPAN R the sides of the shroud were sucked in against the abrasive blade ripping a hole in the side Reinforcement of JOHNS MANVILLE MANVILLE RESEARC AND ENGINEERING CENTER Report Page 404-132 9 the shroud allowed the recorded dust counts See Appendix VII The vacuum system recommendebdy Cape Universal is the Model 743 Mark II dust unit as produced by Universal Industrial Appliances Division In Appendix II further discussion of this system may be found with several American vacuum systems which will substitute The second Rockwell saw saw A similar pick casted was a Model was developed with 315 less 7-1 inch masonary frictional loss due to constriction within the pick design See Photographs and Drawings 19 through 25 Appendix VI By eliminating most of the right angles inherent in the inicial Hoffman Air Systems decisn it was possible to produce a higher velocity at the orifice The higher the velocity the greater the pick of the particles gen- erated by the saw depth of the blade On for the Model 315 it was determined that changing different material thickness changed the relative position of the orifice when side mounted as by Hoffman with respect to the blade In order to compensate for this dif- ficulty the pick was mounted in front of the blade rather than republicaton beside the blade This procedure allowed the pick to continually remain relative to the dust generation point and directly in the path of the generated particles This position also reduced the or siren effect present with some carbide toothed blades Initial recorded results of tests of the Rockwell 315 indicated that distribu by decreasing both orifice openings slightly it would be possible to achieve a greater pressure differential across the orifice there- gen ral by increasing the velocity of the air The orifices were reduced in size by approximately 10 percent of the diameter Asbestos counts for below 2.0 fibers were recorded as shown in Appendix VII The final dimensions of the orifices can be seen in Drawings 24 and 25 Not of Appendix VI CONFIDENTAL Until a commercial velopment work was grade Skil type saw could be located the deconfined to the vertically adjusting Rockwell type saws The Rockwell saws are typical of heavy industrial grade CONFIDETAL saws which adjust verrically while the commercial grade Skil type saws adjust depth by tilting forward at a pivot point This small difference is significant when considering the addition of a dust control pick More detail will be found under SPECIAL TECHNIQUES FM Using a 7-1 inch heavy bearing saw manufactured by Skil Corporation an initial design based on a flexible shroud was tested The results were VII Photograph favorable below 26 Appendix VI 2.0 fibers shows the Skil as seen in Appendix attachment Again when cutting any material a lower seal plywood must be employed JOHNS RESERIOU ENGINE AND ENGINE ENGINE NG ENGINE CENTER CENTER CENTER 7 tim 10 material Cored materials require the hollows of the type See saw was deferreudr FUTURE WORK to evacuate the Skil- secured secured A Rockwell Mcdel 728 way received fro This saw had crude and although dust metal the mocked up ac Rue crude in design fe counts were under 2.0 demonstrates the capacity for field until production of a comercial shroud International recommendations from 1/8 and 1/16 inch cc This saw built shrouds A Rockwell Model 314. 4 1/4 inch portable trim saw was supplied by Rockwell International for test and mock In order to use this advantage saw to the greatest it was necessary to design the ability of an angle cut into the shroud design A combination of the front mount pickup used on the other Rockwell saws and the flexible shroud used on the Skil 7 1/4 inch saw was employed Initial tests revealed that a windage effect from the rotor vanes republicaton of the saw was deforming the needed air envelope Partial blockage of these vanes by closing the desired slots allowed successful asbestos counts below 2.0 fibers with full flexibility of the or saw Attachment of all the above mentioned shrouds can be facilitated distrib through existing and added attachment points Again all orifices must be aerodynamically smooth and smooth lines of flow general are recommended for Field fabrication also includes drilling in addition to cutting drilling Not Cape Universal supplied a drill shroud which fits a largenumber number number Drawings of American drills see Appendix II This shroud see Drawings and Photographs 27-29 Appendix VI was tested on a Skil 3/8 inch drill Results were favorable drilling 1/2 inch CORSPAN R CONFIDETAL with with 0.8 2.5 fibers personal exposure fibers Results recorded MARINITE was come from one slightly higher hour of contin- uous drilling In addition to the Cape Universal shroud a pick up has been designed which will be spring loaded as can be seen in Drawing 31 Appendix VI The pick up shown in drawing 30 has M been tested and a total shroud with combination the partial of the Cape Universal spring loaded high velocity velocity low volume shroud of design Drawing 30 results in the optimum design allows operator visibility while shown in following Drawing the bit 31 This during penetration into the material JOHNS MARVILLE RESEARED AND ENGINEERING ENGINEERING oo Asport Asport Asport 8 wpe See ole 404-132 404-132 404-132 404-132 404-132 404-132 404-132 11 11 Field fabrication can also include the use of a gasoline powered off saw such as the Quickie Target 12 inch saw supplied by Company Evans Saw cutting 1/2 see on de. I The Target 12 inch was tested incn CORSPAN R and found to be in excess of 200 fibers without dust control However highly satisfactory re- sults were obtained see Accendiu VII ith the wet cutting kit supplied by Evans Say Co. is22 Acvondisn T The water supplied is introduced into the all envelope sounding the saw blade through the shroud The blablade de mists the water wherein the dust produced becomes encapsulated by the water and falls harmlessly to the ground This techrique is similar to that used on wet dia- mond blade saws see Photographs 32-33 Appendix VI Collection of the generated water can be effected ment which allows the water to collect a in a sink bar el barrel barrel barrel barrel arrangeAddition of a precipitating agent to the barrel will tle in the bottom see SPECIAL TECHNIQUES dust dust allow allow allow the the the dust dust to set- Removal of the water Removal can be Target accomplished using the same water 12 inch wet kit If the material pump attached to the is collected in a plastic bag it can be sealed and disposed of properly The addition of a republicaton small amount of Portland Type I cement will form an encapsulated block which can be used for fill at the site It should be noted that based on a 1/4 inch wide cut very seldom can eight pounds of or dust be generated in a single day by one operator The volume of this amount of dust is seldom in excess of 0.5 cubic feet It can readily be seen that with frequent precipitation of the material distr^>^ a weeks work could be collected before removal would be necessary gen ral Attempts the adaption of a dry pick up attachment to a gasoline off saw has been unsuccessful The rotation of the blade is for reversed when compared to the hand power saws and thus emits most Not of the dust below the material being out This direction of rota- tion does however eliminate much of the bucking or surging of CONFIDENTIAL the saw which would be encountered fore to attach a vacuum pick be done 1 reverse the direction if rotation was reversed There- up the following would have to of the saw blade to allow a top- CONFIDETAL mounted pick up on the front of the present shroud 2 develop a skid or base plate to a help stabilize the saw and counter the surging and b control the penetration of the blade such that a lower seal could be used as with the Rockwell saws M Communication with Evans Saw Company indicates that reversal is possible and this will be investigated see FUTURE WORK Dust count results will be found in Appendix VII Fine finishing will occasionally be done using either a rotating belt or vibratory sander As indicated by an investigation of JOHNS MANVILLERESEARCH AND ENGINEERIENGGINEERING ENGINEERING CENTER Report No. 2258 404-132 12 dust pick ups see Appendix I attached to hand tools only the rotating belt sanders manufacturedwith ups Due to the small that source saws it was found are presently manufactured small amor of dust produced by attaching any vacuum dust pick when compared to i.e. 1.5 inches of mercury or above with the orifice open to the manufac- tured pick up successful dunt cunts of below 2.0 fibers could be made The vibrating sanders such as the Rockwell 505 shown in Drawing 37 Appendix VI can be adaptedusing using a U tube with holes spaced 3/4 inch apart with a 45 angle separation separation With this pick up attached personal samples of 0.8 fibers fibers were recorded while sanding MARINITE 36. This type vibratingsander due to of pick up is the very fine highhly ighly acceptable for any generated generated particulate matter generated generated See Hoffman Air Division pamphlet Appendix IV ft - Fabrication of low density i.e. below 100 cu materials such as MARINITE calls for the use of a jig or sabre saw Rockwell supplied a jig saw shown in Photographs and Drawings 34-36 of Ap- republicaton pendix VI The jig saw when adapted with a pick up and used in conjuction with a vacuum table see SPECIAL TECHNIQUES gives asbestos dust counts below 2.0 fibers Attachment can be made or using existing screws A modification of the blower is necessary since the air envelope must be continuous and uniform This was done using aluminum tape Premeasurement of the needed modification diste~ will allow safe fabrication of the MARINITE products over a vacuum table or trough general for SPECIAL TECHNIQUES Not Vacuum Cutting CONFIDENTIAL All materials when cut with a rotating blade will allow particles to escape below the cutting surface unless a special provision is CONFIDETAL made to control the available path of escape Referring to Appendix II it will be noted that Cape Universal recommends a lower seal upon which the board being cut is placed This seal can be any material readily cut by the saw being used i.e. plywood For all M board solid materials such a seal is necessary The mechanism invoked is simply the elimination of the lower escape path such that the air envelope can move the generated particles up into the area supplied of the high velocity volume orifice technique will work on thin i.e. less than 1/2 on the saw This inch low and high density materials i.e. concrete asbestos solid panels SOM ; ee a ; facets eweee Vem we dares ANDANDEENGNINGEEIR NEEENGRINEENEGRINP EER n me ee wn aud er AE Src SS? ReportReport Report Report No. No. No. . age 404-132 404-132 404-132 404-132 404-132 404-132 13 13 _ Se for low density thick solid panels i.e. MARINITE an additional vacuum must in the source panei be and co form a crificcriefice of the cut being made Referring to Nagas and Drawings 38-1 through VI Referring 39 Appendix vacuum table design can be noted Basically the vacuum table consists of 1 shaped with a foam chamber seal Norton 977 alse ceil Tessure ve tape 3/4 inch x 1/2 inch and vacuum table able firing strips nection a Mac nection nection the material will strips below the tape allow vacuum vacuum vacuum vacuum vacuum is drawn on the vacum foam foam numerous tape The cuts to be dispos- made after which these these strips are replaced along with a new foam tape border material supports Durable ani eliminate should bowing of also be fabricated to support the the sheet under vacuum forces Cored products such as CORSPAN R will allow dust to escape due to the fan eliminate cut site effect of the blade Two modifications can be made to this with with with problem First seal one masking tape or a similar end fartherest from the method See Photograph a Appendix VI Attach an end cap Photographs 4-7 Appendix republicaton VI with a vacuum attachment Always keep the exhaust connection on the opposite side of the panel with respect to the initial entry This is necessary since the effective vacuum moves across the panel or core by core seeking the shortest path of least resistance with re- spect to the advancing cut distri Some consideration panel fabrication should be Abrasive given to the type of blade blades such as the silicon used for carbide general type manufactured by New by Bullard are excellent England and Tuck Point types manufactured for asbestos cement products Carbide for tipped blades will ease cutting MARINITE products and others Not such as Upson Naples Millboard The Carbide blade will also pro- duce larger particles and less exposed asbestos Entrance and exit techniques can be influenced by the type of blade used and time should be taken in the field to develop the proper entry and CONFIDETAL exit style Wet Cutting M In addition wet cutting to the wet kit supplied by Evans Saw Company two attachments were tested First a SKIL water feed other attach- ment see Appendix II was tested successfully on the SKIL 7 1/4 inch circular saw It should be noted that proper precautions shall be taken when the SKIL water feed attachment is used in conjunction with an electric tool The asbestos counts will be below 2.0 fibers and the same techniques for inches should be employed disposal used Secondly the for the Quickie Target 12 TRICO coolant system JJOOHNHS N-S ALLE ALLE athe ALLE ALLE at ALLE ye ni, sts cena ! AND AANND D ENGINEERS ENGINEERS ENGINEERS ENGINERS ENGINEERS SOUTER ENGINEERS ENGINEERS SOUTER SOUSTOE UTRERSOUTER eens ne were ce bees 378 iis 404-132 404-132 404-132 404-132 404-132 404-132 404-132 14 designed to spray coolant on the surface of working surfaces was investigated However due to the small volume of water produced by the mist ststem 22 is ne cscs !! oe Abrolling the emitted particles see Appendix II from a sawing operation Low emission milling and grinding operations could be controlled by the TRICO- . MIST Tests were also zun on the ffon4 Machine Co. saw at Manville When used in conjunction with the wet kit asbestos counts below 5.0 cc were recorded With additional shrouding counts below 2.0 cz on expected Wet cutting includes disposal of the proced water In addition to the forementioned techniques some discussion can be given to the types of precipitating agents used and various filtration techniques republicaton Precipitating agents such as the Appendix active compound discussed in Appendix solids from be used to drop the suspended solution an anionic surface under Witco Chemical can from solution after their col- lection The physical properties and mixing ratio will be found or in Appendix I. A second method of collection filtration is also possible through distri the use used in of either industry pressure or gravity flow GAF filter bags Long these filter systems have been proven to be re- general liable 50 and and 100 easily maintained Capture meshes of 1 3 5 10 25 microns are commonly available It is suggested that for the 5 micron nylon or polypropylene bags be used to effectively Not retain the asbestos fibers Refer to Appendix V for further details on the GAF filter system This system also opens up the possibility of recycling the supply water if the job site will allow such a CONFIDENTIAL facility CONFIDENTIAL CONFIDETAL Vertical vs. Pivot Adjustment Circular saws adjust in depth by one of two methods vertical carriage or pivot about a hinge mounted at the front of the M base Vertical adjustment lends to the attachment of a dust shroud with little modification the exception being that of angle cutting adjustment The pivot shroud guard however has a forward movement of the saw in addition to the vertical movement This arching movement makes necessary a different type of shroud which must be flexible in two planes of movement three if angle cuts are to be made Mockups are being made on SKIL supplied tools and each plane WILLE WILLE WILLE REPERAN REPERAN REPERAN REPERAN JOHNS WILLE REPERAN Sa awe Report No. 404-404-113232404-132 404-132 404-132 404-132 404-132 15 15 pn ene is being attacked in the laboratory A supplemental report will detail of the planes shroud the necessary However significant modifications existing saw gard pected in order to achieve three of movement It should also bebe noted that such forward movement changes on said circular the relative saws han should be considered whining whining general with the saw ser at secondary orifice should be placed of positiopnositionposition position han lead lead lead 20 of the secondary orifice design problems and most oot. up attachment commonly used depth In the placed aproximately aproximately approximately 30 forward of plane Vacuum Units Large centrifugal fans have been successfully tested These units are manufactured by criterion being the Hoffman ability and Spencer vacuum of the vacuum unit companies to maintain The 2.5 main to 3.0 inches of mercury vacuum with a 0.75 square inch orifice at the republicaton end of a 10 foot hose Many barrel mount and floor model vacuum systems have been tested and found lacking see Appendix IV Un- fortunately these units were designed to move large volumes of air or at low pressures Just the opposite of the low volume vacuum system described herein However additional small units are pres- ently being tested or mocked up for test and these show promise distri The rel Advance Floor Machine Co. produces a twin motor 230 volt barvacuum which should deliver sufficient velocity at the orifice genral Also spect a Clarke external final filter system has been rated with re- to air velocity and found to be successful in achieving the for required vacuum Additional tests must now be run to verify the of Not filtration characteristics the unit with respect to asbestos dust FUTURE WORK CONFIDETAL Spencer Vacuum will supply a Model P 138 vacuum which lists for less than 1,000 to be tested with the pick ups designed This unit is expected to supply the necessary vacuum for 1-2 tools The Model P 190 used for the development program could supply 3-4 tools See M Photograph 41 Appendix VI Interest has now been generated in the vacuum manufacturers companies to possibly manufacture units de- signed specifically to produce the high velocity needed Once the pick ups are placed into use and a market established several manu- facturers will either design a new unit or modify existing units to the needed characteristics AND ENGINEERING re CENTER CENTER CENTER enamelaces math mae same,a ma 8 out _ ee mew SST, eek et . mm i) ! ais na eye erm ~ areeraia An Advance Drivac has been purchased any 55 gallon drum maintain at least 2 Two triple stage inches of ercury This unit mounts on top of bypass vacuum motors will chiough a 20 foot hose The dust collection unit consists of 44 individual candle fil- ters equal to 30 square feet of filter area See Appendix IV Clark Vacuum Company Company hes sup lied supplied a dow dow . toum which is powered by two horse power motors This unit is supplied with external final filters Successful velocity measurements have been taken and dust counts will be ran at the time the Advance unit is pre- pared for best Mockups are being made on SKIL supplied circular saws flat disc and rotary grinders and routers These will be returned to Skil Corporation as models for production shrouds Communication will republicaton continue with Evans Saw Company with respect to reversing the di- rection of a off gasoline saw Preliminary contacts have been made with the major suppliers of the gasoline engines used in the or cutt saws Since these units are simply modified chain saws all of the engines are tooled to operate in one direction However no difficulty is foreseen in reversing any given engine once re- disto^ tooling is completed Stanley Tool Company manufactures tory sander with a built dust collector which will be a vibratested gen ral Routers and lathes will be evaluated with respect to asbestos fabrication and modified as needed for Not RECOMMENDATIONS Completion of the above work and development of the cut saw for TRANSITE pipe will continue Vacuum sources are listed in Appendix CONFIDETAL IV Also shown are partial lists of the various manufacturers and or suppliers contacted during the program Continued work should be carried out to maintain the momentum presently being experienced The design of new vacuum sources should be monitored and recommenda- tions from M would be advised M As OSHA continues to tighten contracts development programs such as this will become more common The solution to a problem is always easier if the answer is totally or at least partially known before the question is asked Therefore continued monitoring of Hot Spots in industry should be done as a common practice " U IT> Corporate Project man State of the Art 1373-74 Survey of Small Tools Survey of Field Cuts Marinite Engineering Information Report Power Tool Institute Mafell Saw Black and Decker of Germany Witco Chemical Anionic Surface Active Compound Rockwell International Field Evaluation Black and Decker Comment on Dust Control Letter Donahue to SKIL Corp their equipment foru BC mt ten Let nas os ent wae Company Rockwell International SKIL Corp. Robert G. Evans Saw Co. Black and Decker Kett Tool Co. Bosch Corp. Stanley Power Tools Power Tools Division Desa Industries Geneva Power Tools McGraw Edison Co. 1973-74 1973-74 1973-74 COMMENTS No pickups agreed to with Manville R to davalop a systam work & D No pickups agreed to send saws for mockup early 1974 wet kit for gasoline off saw Dust pickups being designed in Germany A review of their material shows a de- velopment very similar to Cape Universal of England Samples of material asbestos containing sent for their test with Kett vacuum pickup Will furnish tools for test when development program is completed Offered to for test furnish tools Interested in pickups agreed to offer as an accessary when development completed Interested No commitment Biemone Biemone ; ; a _ UA s pL Alter Alter . Alter f ZS Systems Systems 1 Dustuctor systems offer immediata effective contral over the hazardous and costly roblems roblems of dust created by portable grinders pneumatic chisels wire cruches sabw sabw sabw sabw tools - even ultra high speed air driven roots used to work heavy metals such as uranium By the use of patented nozzles and hocus fitted to individual tools Dustuctor equipment traps breathing zone dust the dangerous under 10 micran range at the source and conveys it through small diameter tubing to a high afficiency separator The small sized lightweight extraction heads and integrated system design make Dustuctor nighly flexibio and maneuverable - it becomes essentially a part of the tool itself All this means decided advantages in terms of installation and operation costs Unlike high volume low vacuumsystsems ystems Dustuctor does not require massive ductwork or provisions from large scountscosunts of make air The system removes only the dust - it does not draw out substantial volumes of conditioned air in the summer or heated air in winter The problem of negative pressure is eliminated You don't need special grinding rooms And reduced costs plus effective production means more profit Dustuctor system performance is highly efficient Silicosis asbestosis and baryiliosis threats are significantly reduced Various Other nuisance dusts which cause seemingly inert pneumoconioses short are is brought largely under control with Dustuctor systems A technical description of Dustuctor is provided under the heading Low Valume High Velocity Exhaust Systems in industrial Ventilation A Manual of Recommended Practice published by the American Conference of Governmental Industrial Hygienists Dustuctor offers the additional advantage of service as a heavy duty vacuum cleaning system Shake sand spills blasting grit or welding flux recovery ore dust spillage from conveyors batch conveying and many other plant problems can be handled These miscelaneous duties can usually be accomplished by a simple change of accessories on the piping system Several hundred world installations have proven the effective- ness of our Low Volume High Velocity dust control system Let a Hoffman representative show you how you can reduce costs cut down on operational hazards and increase productivity with the unique Dustuctor system for for ffororfor velocity volumevolume volume volume volumveolume volume high high highhigh high high velocity high velocity velocity velocity velocityvelocity velocity collection collection colection collection systomas collection collection collection systomas collection colection collection collectiocolectionn collection collection colection collection systomas systomas systomas portable portable handhold tools portable hand hold BEFORE we ' ee DUSTUCTOR AT WORK rr 1 AFTER a ae if" EXTRACTOR HOOD } . 1 q r i | bo oS , . or Zs. des A rk + : wy bye aes Hiawmre 'S ee a - t t . ' 4 re aes OO ox ' ' heen eee . - | ; tin one ee te . oo Ths , fais 2 ms Ss L & Le : Wo : tees ase 1 fo + ered A R BOEING CANADA IRON FOUNDRIES CATERPILLAR DENVER POST GM GE B. F. GOODRICH - HONEYWEL KROGER CO LEVER BRO MARTIN CO MORGENTHALER MORGENTHALER LINOTYPE PEERLESS POTTERY INC CHARLES PFIZER RAYTHEO REMINGTON ARMS - S.N O. ROYAL ORDNANCE FACTORY + STAUFFER UNION CARBIDE ARMSTRONG LTD WATERTOWN ARSENAL WESTINGHOUSE WESTINGHOUSE S ALUMINUM CHIPS ... ASPIRIN DUST BERYLLIUM DUST BRASS CHIPS CARBON DUST DUST ( CEMENT CHIPS CERAMIC CIRCUIT BOARD DUST ; COPPER CHIPS DETERGENT DUST EXPLOSIVES FIBER GLASS DU > GRAPHITE BEARING DUST * OIL VAPOR PAPER DUST PHARMACEUTICAL TABLETING DUST PLASTIC CHIPS PORCELAIN FRIT SILICA DUST DRINK MIX TUNGSTEN CARBIDE DUST URANIUM CHIPS & DUST Toy i { 44% _ L a : we ra | an , a wo mo Shey aay 4 A 7 NOAA OU gre a eye re, V p, at Stee, ryt ; IN 17 sn y Veagss: Pere Cade [re hibit a : : a iain Rae | pee e ee ee A > wv . a, ry 2 Sag =e % f. re oo, . \ . - , Ay : s- pO ee ii ry Net pod 7 dt <> Nav a : Pad f 1 . re. e? . ; / ra d i f - Rocket Propellant Pick up iba : ne oe eee . a / <a , -- . ~ md oN : e bs Teper eS crtisere tev tlt att \ FomnaroinWs, SMOOTH FLOW 4 hed, a PICKUP POWER TO 12 HG Basic equitment for a typical vacuum cleaning system " consists of a centrifugal exhauster connected to a separator Omooth Flow tubing or steel pipe carries the dust air " mixture to the separator The tubing extends throughout the plant with inlet valves at locations where collection is desired A large selection of hose and tools is available to suit your application Of proven cast bearing heavy design Hoffman exhausters permit continuous unattended oporation at volumevolusmes up to 13,000 Clm vacuum to ng Dynamically balanced rotors provide for smooth running Standard motors and drive shafts are used PERISTALTIG VALVE Patented Rubber diaphragm valve continuously discharges abrasive materials which would wreck a rotary feeder d e ee meee e et pe SMOOTH Smooth pneumatic tubing and fittings have slip joints no threads They are easily installed by technical personnel with every joint fastened airtight with an adhesive or tape on the bell and tube fitting Hoffman Smooth piping assures you of full suction power from the vacuum machine to the point of work HINGE VALVE Unique valve for batch discharge Flap is a cast Iron spherical section with linkage arranged to be self- compensating for wear Seals against a rubber gasket placed out of the normal flow of material . Available in manually operated version or air operated as shown HEAVY INDUSTRIAL PORTABLE VACUUM UNITS Hoffman heavy portable vacuum cleaners through 15 HP Mobility and flexibility enable the operator to do a thorough job of dust collecting or vacuum cleaning Typical of the Hoffman portable units is the 10 HP Hoffco- Vac 100 developing 8.5 hg suction Filtering area is 63 sq ft Removable dust bucket has a capacity of 7.5 ft ENGINEERING SERVICE Hoffman Application Engineers are located in every major city in the United States and through subsidiary and affiliated companies in Canada Latin America and Europe These men are specialists They will focus Hoffman's 50 years of experience on your individual needs and can save you time and money You will find their names in Thomas Register and the Yellow Pages of your phone directory or you may contact us for the engineer serving you There is no charge no obligation for their service | HOFFMAN t - DIVISION OF CLARKSON INDUSTRIES INC USA Air Appliance Department Homan Homan Industries 103 Fourth Avenue New York New York 10003 TEL 212-677-3600 OFFICES CANADA Industries of Canada Limited 58 Bertal Road Toronto 15 Ontario TEL 416-763-3528 UNITED STATES CANADA ENGLAND GERMANY FRANCE ENGLAND Air & Filtration Systems ich Howard House -- Lloyd Street Altrincham Cheshire TEL 061-928-7402 061-928-7402 SWITZERLAND ITALY MEXICO Dustuctor R Low Volume Velocity Dust Control Systems Manville Research & Development Center Denver Colorado 80217 303 770-1000 April 12 1974 VOR Ur: Dr. Franz The Upson Lockport Alfeis Company New York 14094 Dear Franz We have completed our cutting tests with asbestos fiber count on the asbestos laminated paperboard products you supplied One of these had a plain asbestos on the | paperboard but the other had a printed vinyl overlay on the asbestos In our first test we used a band saw with all ventilation off and we collected dust samples in the immediate area and the also on a cutting personal sampler worn by the person doing The filter on these collectors was then examined microscopically according to OSHA standards and the number of asbestos fibers counted and converted to an hour weighted average Test Board Plain Laminate Plain Laminate PVC Laminate PVC Laminate Test Type Personal Area Personal Area Test Time 30 min 30 min 60 min 60 min Fibers 8 hr avg 5.2 3.1 11.2 4.0 As you can see both personal measurements were above the 5 fiber limit established by OSHA and all measurements are above the 2 fiber limit which Manville has imposed on itself Subsequent a portable to the above tests we made another test Skil saw with a dust control attachment using This test was run for thirty minutes but only on the PVC laminated board since this gave the poorest results in the first test for some unknown reason The test with the Skil saw with dust control gave fiber counts on an hour weight average of 0.7 and 0.5 fibers for the personal and area samplers respectively These are well within limits the set limits within of OSHA and also Manville the more stringent Dr. Franz Alfeis -2- April 12 1974 These data show that it is necessary to provide dust control when saw or other asbestos laminated unit of that type paperboarids cut with a We do not believe dust control will be necessary for shear or rotary knife cutting within a plant but this should be checked at the appropriate time As mentioned to you we hope to have brochures on self- contained portable cutting units with dust control attach- ments within about three weeks now As soon as they are available we will send you a couple This type of cutter apparently will be available from Skil and North American Rockwell This should present give you the information you need for the Sincerely Fichen ef John W. Axelson kjm CC R. J. Hattersly - Boston bcc W. C. N. W. J. E. J. F. F. L. W. J. P. L. Streib -- D Hendry - 2 South Connor - 2 South Reis - 2 South Jackson - D Plichta - D Earle - D 0 OSV TTK, oe . ee hel er * ~ ee eee we ee ; Ne oo \ we ee ee tw Ne Ste . ke Ne * oo ee ete ok L. 2. L. Earle - D Center Sw: MS May 28 1974 D. R. Christensen - D Center D. E. Hillier L. Swallow - 4 North M. F. Trosper - D Center " SAWING OF MARINITE 23 ONE INCH PORTABLE JIGSAW MODEL 648 - D THICK USING A ROCKWELL CENTER - SPECIAL REQUEST Special samples were done May 23 and 24 1974 for airborne asbestos fibers generated during the sawing of MARINITE 23 one inch thick Ventilation varied but the baghouse used was the same The results follow Location Description Ventilation TLV Results ACE Aroa Rockwell portable Spencer portable P 2.0 0.8 cc of Product jigsaw Model 648 baghouse using 2 P 2.0 0.5 cc Duvelopment Building hoses one to saw and the other to the vacuum table A A ~ P ? Area Personal AreAarea Area Personal Personal Area Sample Personal SampleSample Spencer portable fuff baghouse venti- A lated saw only 2.0 2.0 4.9 cc 2.3 cc Prepared by T. F. Antonson 2.03 2.03 -e 2.03 2.03 D. R. Christensen jes AL 102121310 | Manville esearch esearch and Development Center E | Report No. 1411-1050 | ~ aye | ao. | be expressed as percentage the tabl an additional measure By this this method the amount of work of the total material pulverized of dust collection effidency done by a tool linear is cut 106 eely 6 of material pulverized per unit time was measured for nore accurate test comparisons . Tools Tested with the aid of Dennis Kelleher number of tools from Euspe areprocured for evaluation The results of tests with times and other tools under various conditions are detailed in Tables 1 and 2. The tools are described in Table 3. Test resultosf sach tool will be discussed separately It should be noted that i great deal of work was done during sach test i.e. 4 holes irilled 18 linear in minute etc. This rate fabrication is probably higher than would be encountered in tha field and thus represents a most severe test condition Tn addition the dust in the chamber was concentrated in a emall volume of air and the air flow carried it directly past th sampler giving higher readings than were encountered in an open crea | 2011l - ised to A 1/4 drill in 1/4 Black and in holes Decker in 1/4 drill with a 3/8 in chuck wes in flexboard with @ common masonry bit The board was held vertically parallel to the flow of air through the chamber The drill was held horizmtally and operated at full speed With no dust collecting shroud dust counts were a low 0.9 ec With the shroud marketed by Cape Universal .2 ce Building Products Ltd. when operated with the the dust count vas reduced to shroud in an open room the Just count personal sampler vas less than 0.1 cc tersen Nibbler Dan Klip No. 80847 ~ This unit vas mounted oa 1/4 in Black and Decker drill with a M fabricated adaytor and operated at approximately 40 percent of full drill speal With to dust collection the tool gave a dust count of 1.0 8/00 in the just chamber and less than 0.1 cc in an open room The at was other rough but the tool operated well and should be satisfactory cor: z with asbestos up to 3/8 in thick where a amoth an. ed cut is not required This loo^< is also recommended for sutting corrugated asbestos cement It was noted that coase Saterial accumulates on the floor with use of this to0 M i anville esearch and Development Center E | Report No E421-1050 Page 3 problem Barcem Handsaw - Eternit Sam No. 808101 - This sample handsaw is lebo ous to operate With no dust collection system the dust count was 0.3 ein the dust chamber and 0.1 ce in an open roof It was noted however that a considerable amount of dust fell to the floor during use which could pose a cleanup SH orca em ndcl - Eti ernp it p Sae ksr BOBs OS - This hand tool usable for asbestos up to 3/16 in thick produced a dust count of 0.3 ec personal sampler in an open room with no dust collecting As with the nibbler above coarse material accumulates on the floor when this tool is used - A personal Scerim Knife - Eternit recorded No. 808001 sampler dust count of 0.8 oc was recorded in an open hand tool It can be used room when for cutting using this score and snap asbestos up to about 1/4 in thickness . Cape Power Say Shroud Mounted saw Rockwell Cape - Universal i Building Products = Ltd. markets a saw shroud nade of light flexible the board being cut which fits over the saw guard above plastic with the shroud on a Rockwell sav using 3/4 in Tests were run under the board being cut to prevent the escape of wood backing A dust count of 1.2 cc dust from the lower part of the saw with this shroud ware was achieved Nowave three problems The wood backing is needed a somewhat bothersome require noted which workers in the field may not adhere Secondly ment to into contact with the blade the rather flimsy plastic was pulled pulled ~fl by the vacuum assuring quick destruction of by the the shroud Lastly vacuum system but vas a@ quantity of dust was not picked up trail on the board after cutting posing a cleanup 1: t as a the use of this shroud is not recommended ; blem for these ressons dospite the acceptable dust count achieved Open Type Shroud Rockwell Power Sax - This is an open type dust collection shroud designed to capture dust particles in their totally enclosed design which is flight path as opposed to a ^ number of attempts were simply evacuated with a vacuum QUILE of the tool including the made to improve the performance vacuum box under the following the use of voed backing or a diamond which create loss dust board being cut thin blades . less material enlarged discharge simply because they pulverize baffles inside the shroud to ports leading from the shroud the flight of the dust adding particlus particlus toward the vacuum ports direct around the blade elimination of all added shielding at key points fittings teas in the vacuum hose and attachment of the 2 in the shroud thus eliminating hose from the vacuum cleaner directly to with any of the above all 1 in hose The best dust count achieved attempts was 21.0 ec , eve ya Rh saw with an enclosed shroud ~es ori AV And ew tratinn vick tr hacen then . received the Festo from Avant became evident Manvil e Johns Johns Manville search and Development Conter E Report No 411-1050 | Poy equipped ee shroud - Germany - This tool came ------weg 0 e and to escisse most of the : \ Vindu and shroud designed iph a Ga@swow this enclosed olume then to be evaluated lade and cutting area Tested in the chamber without any vacuum pickup the ? LOY Vawuwr. 20. ce With the v 'cuum cleaner operating and the Just count was and saw exactly as received from the manufacturer . The shroud but still substantial lust count was 4.5 cc ^ great improvement The shroud was then lustier than the OSHA standard of 2.0 ce of the bottom bottom aodified by adding two rubber skirts on the bottom part between the shroud and the shroud which sealed the apertures This change resulted in a further decrease in dustiness f the board in both the chamber and an open rooR It should to 0.8 cc in tests from the manufacturer wa * stressed that the saw as received ware necessary to ment the shroud modifications be 220 V. the Jnsatisfactory and Also the power source for saw must ISHA standard 50 hertz modified tested - With the success of the J Shroud similar attachment was made to fit the Festo shroud a version resulted in a fiber count of Rockwell saw The initial made by tape mockup and Additional changes were cc in both the dust 2.5 ec at 0.0 cc Reproduction in metal gave zero to 21.0 ec chamber and in an open roon tThehesmeanfuifgaucrteusrecrompaIrt e should be noted for the saw as received from that these final tests were made with a common masonry blade AB expensive diamond blade is not required between this dust shroud and the Festo model ' The major difference the volume volume of the M model rel- is that efforts were made to keep it can be red^"ced still further and to and debris atively small although from the shroud through which dust minimize openings could escape and air could enter and reduce the vacuum this end the following major available changes wera for dust collection To made from the Festo design . giving bracket is outside the shroud allowing 1 The vertical adjustment the shroud to be smeller and easier access access for adjustment for cutting boards of different thicknesses ror op se rts on the bottom half ereonm shroud and the board of the shroud seal the opening Deing out without binding on the board Openings in the saw table on each side of the blade were closed Cooling air the motor is excluded excluded from the shroud and from The Festo draws air through Instead exhausts into the room air available for the shroud thus decreasing vacuum the motorinto dust collection Manville | esearch and Development Center Report No 2411-1050 Dana This d collection shroud gives every indication of allowing the cuiting of flat asbestos dust free manner when used with the dust sheets in an acceptably Nilfisk GA vacuum cleaner with no other special precautions or procedures Vacuum Cleaner The Nilfisk model GA has a three stage filter reportedly retains 100 percent of dust particles micrometer in size and 99.9 percent of particles system and down to 0 0.3 micrometers by in size This unit is recommended for use with asbestos E. M. Fenner and is therefore the only one recomended for use with tools for the fabrication of containing materials Several tests were run in the dust chamber to better determin : the suction required to adequately operate the Rockwell saw equipped with the M design shroud The results detailed in Table 1 are summarized as follows a No. of Vacuum Cleaner Air Velocity Pressur Dust Count 3 3.0 0.0 2 2.5 0.4 2 1.0 2.3 The dependence of dust collection efficiency on the vacuum source is evident These data indicate the possibility that a vacuum eleaner smaller and less expensive than the Nilfisk GA might be usable with the M power saw shroud and still give fiber counts under 2.0 cc The use of a smaller vacuum source cannot be recommended however until after acquisition and testing of such a unit Sax Blades It is worth mentioning a few words about power saw blades Our outs have shown that with the - saw shroud common masonry slagne ** satisfactory both for the quality of the cut and for the fact that the dust generated by their use can be controlled by the shroud This type of blade is inexpensive and locally sv^/ljable in all parts of the country Diamond blades have one distinct advantage over ( That is , compared they are to 0.125 thinner on the order in thickness for the of 0.06 masonry the masonry blades to 0.10 in thick blados The thinnes Manville esearch and Development Center E Report No. 16-1050 16-1050 Page | Research dust because they pulverize a smaller blades obviously create less have two drawbacks velune of material Dian nd blades however each and unless they are vesialuted They are cxpensive ovel 6100 the blade they can burn out is very have holes slots etc. in An unventilated diamond short time when usedunuwsiatbhleacsob nde its iot n o afs ter cutting less than 18 blade burned to an in a test at in of 1/4 in asbestos recommended for use with the M shroud for | Masonry blades are one wishes to use & i cutting asbestJo ads en bIla fdehovweenvteirlated for dry cutting is Inc. Amityville diamond blade the Geo Pfaff It is available from rNeecwomYmoernkded CONCLUSIOKS drilling drilling ' has been evaluated for cutting and A suite of tools dust counts below 2.0 cc and - isbestos which gives for use under the OSHA should be satisfactory method has been developed which therefore standard In addition an apparatus and of tools and materials for testing the dust generation generation toof dausvtariaentdy is available f^,r use without exposing the operators in the future Fenner that C. M. will direct the assezb y for dissemination It is anticipated in this report of the information contianintehde asbestos industry to interested parties +a Vn, L v | Johns-Manville 3se@arch and Development Center ReporNto bab -1050 a | a4. oer onog leon dual Hphlae1deubp etbpues Por Trot weoseq er ece ee Gopr-es an 14] "s trict'yey-qe gedowners S299 erege pemeryWeg16) gong 6.0 6.00 Repraso> Lk Ue 5 "93 dFap 999 q@amet ete Qiay povny 6am een "O88 609 DY GERD Jagua SOD seas {RE S804 02 TeDsem po GRAIMOND) GEnaed PES 5030 "97 ' om Of) Wy septvl Se septevel [reje) tews $30 rable | 4 Ebet subrcon subrcon phens wep Poseur adie orenER termsnpoge wes TITHE ai tenes Poem ae (020R Gere OtFAP peng we we OS peraevy sOesnteg aeag gmt "emsgy oge gese *pae GOdPse0) OS2ra0., prenige 0, te, anse os oy 51 . phleb * Gh BIE seeod my o 44 mere pmotge 4g Mbaqe 06 a0) pee weltie ety Sg:gore pong ~os0 cote 0) 2 -aer9 -o+ | Oy ona ney 8 nes OPFOR 88 vo + et 1 OS8 902095POR el, gates Sewn: Pansy O8tS ane 48'whe * He Rak see) ba lente nes ehh suseg ote H08 es, web sDHegeg getfeny pete Deen ve dmurge GH 90%, UROCey wanes Dhedag seming SACP-bF0R CON befi = at p ee Mee Oe? OERyosag t_sercm tw Ve He S021eiGe -centam Asha, Nady se wd 0595 Cwty ee = Cath 20g Ne 07 et e-Odeg iret ene 7sge iteta Oemn@) 2P55 okt 4 e Fan '. ag bag boty oy 5 toy n0y sg oSeny We ne EPy ale some teene vey adem rey tty pre) ae ad Jt Johns-Manville 2ssarch and Development Center E Report No 40~1050 HE 109s Ferhoy tpeyqe secome quay location er Sepms ORES Pa 5 9+ O1Fd oe ot weyoe e s 2 ce awome {hee og 4m gy $4 senwet vameodt Me op thats be cost Otro Nets steamy gg 7 ae DY ty Re eD 5 es oe oe he "1 souls plact be be peteelp ned ^light qo _ tema danpy rT! re OR ME 1750 lente I iw we re oe i5R . L908 OF night night 16. Sub 06 99 wa wy with 600 ace Jone ey ** 4496 _ 7 7 Mee owt wh oe Gea oan as nes - ~ +0 Es peovyes e Oretd 65.040 Bee $ Up Tp skaner ewyse $4s0bet comeing proeria 1ebycep e deg *poe OH @} Sty Ste SOO 52890 DeePOO Jy comey efing ewes OD velocity eneag Absyed O68 AERO ahem 20at wmaoce nagen Pose ag oP 0) power 80h) owns 096 segeyr gepe gre mre sewere Semensdteegt fainork Ptwag: pietup velocity presure presure Waten OF prenk Pgeyge gheoom opera maera s Gnaned beghtwin beghtwin sewng or am-s0 ar beghtwin eny se fainork fainorkte wy opie mere. qanzGestre oF ave & 3. que ger" .-7 ae o> 4; tae tee m7 [ed oy) om mr wee en ney se0 CF won ePnseng oOpnenels Pors ra cmmg are seg Cr ar 1 seriapen aonduyo 54 Pete meet ke Demer Saewyte - s bok 2P*8 08 PIO Melon OF$ O0G obr%. EI Py Binay Pen eres aeaeg ee oeyn wtie ar) Lime Litanypaer-g Hane a0" wre orhe ade]YES ana ots eeeg- @ toe ay og pay D a eoionns-Maaville Searcahnd Development Center E Report No Z4\3-1050 Vey fone soup sa . oeis rmey oraeys Gum] Gop se m treme MAREKAN MAREKNined MAREKAN cte mp MAMREKANREKAN cte | | 0 ( poe) + sos 6nd. BOs Oe coegeebaaey POST OsQTeg ombe peony deep FE 1079)benny fe bo tone 6.S4 sa asd aces oes OST | le tn Parngyewalberkbienrkging mM (3) % $e ay Bae we out COPSd among syoen . ve orm j ue ru Corkids ......... hrout ... ... ... er 1-- at ag La < mt iw e wich ... ... ... 29100) 1-- . ey mH a wa "ol "wa 20 - 4320_she u~ ... att 1000 ... 0 .30 aotc 10 oot . aat ttt wh CbtoNE D matique kiste backing toy yo $y Blight0s Blight Blight hot Jetro * * 191 OE Le00 way|e ery of se rt) tt as se se st SE rng hver hver soerefi crowten tOTDD nt nie a 8UI0LL4OT8I Gn * fes PerG MI_Bre WEOJ ADEH C1908 WO Spty'd aDyS Obsak OO Cp>rE SOG D 60 UILOTI Detce UsUNED emnrs ^ O0by OFS pelvrkoedplverkod col0940, porsant wie,,ish stroch wie,,ish col trajnet segnonsa se pelverkoed wie,,ish stroch porsant by Tegane COWES segnosa EmEtF wimers trajnet segnonsa BAh se se pelverkoed pelverkoed ebdswray aides Greiont SOINDS sibgec o6s0-. Parte ayom teeGt; OH: wweOhl ELD. ars. pepe cow. *e fi pod, aan ++: wits Boag 1 oy +6 5 s: sve . -4g] s+ coe - 4% .4-2 es sam UE og] | | te] Re, > - * wey 407 os 00 epguey docomy dorbeny G28g Ott rE froencey etoansey sen fer any bets ~ = = = = aoen R 20} y cng e mag any OPE PO! Beso epys Tyet qisnytes Licet~- Fietan bianer pong rye padere febte 9) pesy ty wren eve merole Dog tema 4 me ey 147 ora CEPR rns | sl Joons-Manville 2search and Development Center [uu] Report No. 411-1850 Page 10 OVET EPICTED fol fol O00k dvoceys Lieb pep segesd10psonem veormeg pe Ob sapew . pones abeg cone @ 163 batte feitiaGeysne yom se n)*weq ued sumecael Ld | | | salinatheduet netwelts ley t'e g'e es ee Lm - 3006 we ee ounweyes tM) owenwes 2 e coneores O.L 1/4 Elioraft stlecalsa [rue owe OED aed ows Ee of | " 89 rer 4 . con O'ort wrest Oa] g [ot Pts Ae eybag owl el oy Ot 99 1/8 173 18.4 ae oes ChArneTD ratioes kun ose 3 | model ed oop OS fone EOF Et eo) oeg modeld cs~tle-cams a LONG m^' bl^,#deficfhrom wee"art teto. wet oe7e 3, eft aegyar 993orus: ......ove RE 40 en tatAsie onon Dotton Oty " | tt 1 coy Ge a shroud 1 FiOVE groszare Te mir a mir ,23g pROSE porta SeyCav oye *wegdstNe Tepaonzes fered *geneafi Setuce Boag TBESEe AiatogE bEt te ep er 09UME iy femg *qences TOEyrngys 979 Te Pre Ben aes o apes agen BAP aONGhID MD beh Cb-O8 oye BO bad Ce-wb enmeys ogo Teg Oa Ge5Th Oe 849Seerere toy ta'5p perqeua bdofthe omney GRMN SIDS a E oF WeOE) Qewie Oy Adi *tpwen tenga HOeNe p+ ose a: hre- ee ters erage A02y0.; t2e:e Omen 4249- J | pth@em, DEROAT Cen rawr dewtovey pepenreg {wtea sepng op cncag FOEaTS gee bene aeory 80g pena s ate rye atey Bvt = *pyme O869a ID OpBS Ubsp (er9@e y Gig ve tebnw ong Quter eoqreg 920 84 gedsdgeBg eho FER Se rE oem LDO OM py Gm teme Seyoveg & {tien ae ees avewe ertaretds a test acwea ote ven Foe met erie ceml ome gy me gesnore sace { mo, ae ee eeeee ( Manville Search and Development Center E E E Report No | | Page ti11 1050 le ee wee angrerinonan: ccm APPENDIX : OF TOOLS EVALUATED AI TABLE 3. DESCRIPTION Cor FOUND TO BE SATISFA Nose adaptor to used See H will Cont - (7 fabricated by J- } 1 in l^,g of the 1: for A La mv When 7 in 1 in 1 used for drill tee am. H | Fabricated by J-H. 7 lower Say Co - 8-1 in model 680 Rockwell International Locally available in most areas Dust pickup shroud for sav Fabricated by N 7624046C and blade No. Dparc*?2 Blade 8 in Jaden ventilated ventilated satisfactor but it 11 desired to reconsended Corhon masonry blades are is highly blade this type diamond use a | Geo Pfaff Inc. 16 South Ketcham Avenue Amityville New York 11701 Masonry .isco Blade carbide with -Kev England in. Research tests were made wiasng should be satisfactory blade Equiva Locally available - 2 in x 1 in x 1 in Hose adaptor Fabricated by M L Manville Schns Manville Search and Development Center E Report No 8411-1050 | rage 12 J APPENDIX I TABLE 1. AND DESCRIPTION FOUND TO BE OF TOOLS EVILUATED EVILUATED SATISFACTORY Suu SOMESS Nilfisk Nilfisk stems model and 2 GA wem in hese. cleaner equipped with three ilter Nilfisk Nilfisk of Americs Ime 701 King Manor Drive | r at King of Prussia Penna 19406 Telephone 215 277-3900 1/4 | No. in Black and Decker Model 92555 1046 equipped with 3/8 ix chuck } Locally available in est areas fust App pickup shroud for drill 563 Portable Drill Yozzle Kit - Pet . Cape Universal Building Products Ltd. anes Register Office Office P.O. Box 165 Exchange Road Watford England e Telex - 262744 Telephone - KATTORD 34551 Masonry Bit - Research tests were ade using 2 1/4 in carbide tipped iegular helix No. 5463 FDS bit rehufactured Tool Divition of Qulf and Western Any similar masonry by Super bit should | ba natisfactory Locally available > e \4) Manville Johns search search Development Center Repart fa. 4rr-1050 Report 2411-1050 APPOBS . TOCLS CVALUATES AND DESCRIPTION or VALUATED TABLL TABLL DESCRIPTION DESCRIPTION TOOLS FOUND tools tools avilable freat yefollowing . | Har com 3470 estad 02 78-03 60 Telephon - ^'rili with Black and decker ^r^ described above No. 80847 for use and Decker asbestos : described for cutting i 3/8 thickness Adaptor in. thi thickness for mounting on drill adaptor, required is fabricated J JK. cutting saw " Cernit Saq No. 80810 Sawbiede Ekstra Eclipse 80811 Type 56-10 This tool Sagblad No. were situations situations 1 for required only limited limited amount a limited amount of cutting required required . tool is up approx 80800 + fh thick cutting asbeslenmei + . oe vt up te ar ppr73o . ex er euxrtang asben lund usable for thick ( r material Norcem ) un thickness of with maximum maximum recommended recommended for cutting cutting relatively material of ly for cutting relatively end recomended sateriel. this tool is limited lii mintedis. small oximately ot quantities quantities of ' : | \ eres te n Ronville Ronville Ronville Ronville wee To * Ronville f Ol Ronvilleiar Aas I Ronville itt 4 io 4 Aa re rd of se v L 7 tt. : nde eretrwr Img rerons seve reerr t+ oe ; mine an thes yesee toe Ler 1 tre aeonl. ted t: ++} be L-+ eh TE pee . os Lies rr , 1 AEE enene Bebe ranean:be. o I iv : sese ti nat yily aac ight oh a f | r mesdens Cd je a Ap mi ad 5 a a a * ban ipve A "] Cre. x g le f a : = 5 ATE > be . | AGS tn rig-|- Sopp rhe dpe, ot com Leateobe aat Ve 4 fiog ehd Prtt as | reli Bae vegda ye) wats PeCE Sra s fod saghet reid, So of sabae re LP =) < + 5 ge hat . | naseree Trays 4-34 ethe anes SRmAn Th duat- - ae f+ -eb- 14 ore \ a Fe ~ +14 4 ~E ke eh por vie | aAhG 4 - - - ~ - -|4 - ; Caray iit! see ety, L. Manvilla search and Development Center E ReporNto = 1411-1050-6 / Care August M. 1978 EVALUATION OF TOOLS FOR ZET FR-E FRE EE FABRICATIOONF ASBESTOS -CEMENT -CEMENT SUMMANT fabrication of flat / All tools required for common site of a bayanet sabre sheets have been tested with the exceptios outouts for saw and a band rasp The saw is exceptios exceptios fo draming or electrical fixtures piping sta aad the rasp omis beveling rough edges of the shorts ither of these these rupnirod woulbde used continuousloym & jem, wet theierre for detail work Model 548 heavy duty bayanet saw with 67 12394 A Rockwell carbide blades Veh purchased for our experimental work A to the saw housing shrood vas designed which fits tightly and cutting area above captured and cumpletely ancloses the blade are board All particles emitted above the board Air enters the shmut a Nilfisk GA73 vacuum cleaner 08175 the slot eut in the board by tie blade wade sic below the board of only through from stroma carries fine dust particles a and only minor at of , through the slot iate the coars^ like material escapes One advantage of this design no shroud below the sheet and the saw can itshertehaftorethebreeusiesd for entry in the middle of a board This of tht factor should add immeasurably to workmen's acceptance this saw were zero in the dust tool Dust counts Table 1. with of the shroud &n test chamber using @ ple le prototype aluminum shroud resulted in 0.6 face in the test 0.1 ce in an open r coonosmideTrhedis ssahtrisofuadcetdortyooflor the intermittent in the Appendix is service for which it is intended dust counts of 0.8 and 6.1 ce in the test The hand rasp gave Its use should be veEY chamber and open roam respectively fine debris which memulatively limited however because it creates could result in uxcessively high dust counts Contents Summary Appo ,, lodyco Technology ARSA ARSA Technology Reported by . lodyco Asbestos & Mineral Technology Technology Reported by . Bauman Bauman Asbestos & Mineral Technology APPENDIX Ld 3w}rs a) ' RESULT8 S CY OUST TESTS te oly fany e am er DB 7 OL 159) wee fer Poet) Birhos 09/12 Birhos OF Fi eey cites ee one 5989 Fase - 1 1m OE ROMNEY Teqsnerte*dee 079 358 MU 2997 358 lbiteedoneg " for 13 strokse fers 33 stroke Basciption Basciption Basciption the RR SEAR UinGuE \ fegad . Ore ewed elie ~7a8 5 buat tech chamber FO bukng QO0Os CODER 94 bukng duyagy fabricated oe ' $04 OF ,sogmeyda09en PORTO Edeb Gerd NDeS ceu on1D giecSheea woewtsMeoh8twrve-0$ AT]8 abot pdyead easer st GF EF SU, iTFabsees ems pens Vitel SIT Satsecone TIS YoesyGrvesi THIRS VETSatl Sense PAONGs AEE Peed eys T VST Weskesy ROTEIET CERRY elRey od Vie tae Tere Fee 18. T si) al: et re 3. ses,atdGla Ser JO te DEPSIOLC 660 Eades gresye Gute etaping 267 ave ves BhOt Oo TPhes 5 wepasd19 4d onty gous Fu pnretd Voudeywerte aetg Pe4e0s wdbos-572 ESUISentad vy OO sejew C08 FR re) OTE feqasie 3 ne ae Pe $ 20Q10ED SABRE SAM Johne Manyule Sales Corporation QR ae Bapit> 2 B Ctr B . An And d hanno yes Wanbi vi ee wash wash s hand bC e ube& Steyr Ep Er : 7 Joanande Bureau ot - obseph iedicine Navy Department : Washing on ellanca ellanca " surgery Dear DT Blanc in accordance with morning anclose our the telephone llowing Lonversation information Asbestos Pipe of the work practice Asbestos Cement Pipe untitled enommended Work booklet prepared Producers Association Practices for C De 4 333 onclusioUS rom " reparepared red repared ov sental Neasch wees + Serkeley (a@i. fornia Which Sncludes Ronitoring 387 from U Doerations utilizing - the recommended Work 2010es teat 0 Asbestos Cement Sheet iGRtes spy of Johns S Research and DevelopmenDevet lopment Rn fe Center /pport T - entitle Tool Deconstration Deconstration tor MAYY eabees Condr Joseph J. Page 2 March 19 1979 Bellanca Monitoring data for spray application of asbestos reinforced asphaltic Company all cases coatings has been developed by the Flintkote They have informed me that the fiber levels in are below the OSHA mandated limits I would anticipate that brush application of similar products would generate even less airborne fibers Special tooling and work practices are not required when applying asbestos roofing felt or asbestos reinforced asphalt costings. The fibers are so firmly bound by the asphalt that the standard work practices are sufficient Fabrication of asbestos products using portable power tools can generate airborne fibers in excess of OSHA limits This occurs because these fabricating operations apply sufficient mechanical energy to the pipe or board to literally tear the fibers loose In the case of A pipe this problem has been overcome by the use of single point tooling and the recommendation that portable power saws not be used In the case of A sheet the problem is being solved by the use of special hand tools and the installation of dust control equipment on portable power tools I hope this information is sufficient for your needs Please contact me if additional information is required Very truly yours Edmund Edmund M Jenner EMF jh Encl CC R. P. Carter - Manville AL 102121298 102121298 i > SirManville search and Development Center xo ee wes, tae Report^-o Report^-o bedi usG VALUATION 2p UO lm Tak. SUMMARY SUMMARY asbestos cement of this project van to find or develop tools for dust Neobjective in an acceptably he field fabrication of dust count under the ORSA standard of reemanner . with 2.0 fiberajer the vas first devised with which the dust in apparatus and procedure and materials may be evalua generation of a variety of tools dust evolved This test vithout exposing personnel to in the future ; cheaber is expected to be useful for such testing Tools for the site cutting and drilling of asbestos fiber counts of less than 2.0 have been evaluated which give tools Of special fibers Included are both hand and power be used with saw and shroud to Interest is a portable power or special procedures 3 Milfisk vacuum cleaner with no awkward 3 a wich dust counts on the order or precautions the tool operates should be adequate for the of zero fibers These implements common the fabricating requirements that 2. M. Tenner will direct the assembly te is anticipated usar~ utilizing of * work practices manual for asbestos the information from this project 21545510 Contents Conclusions and Summary Introduction Introduction 2154525 1541 550 10 3 Appendices Reported by 7 . F. Asbestos and Mineral Technology r i , - AsbestOS 7. Beur an and Mineral Mineral pe rine ow: 4 98, ws R : aan Manville esearch and Development Center E | Report No. -1050 Page 1 INTRODUCTION INTRODUCTION wes to locate or devise tools that The objective of this project in the field in -ould allow the fabrication of asbe ins fot rmoatsion on the tools in acceptably dust manner The manual to be prepared under will be included in a work practices he direction of E. M. Fenser is due Milt Trosper for the voluminous back- Special recognition Stella Gabure for providing information he supplied mkrane filter test services und Les Monard for his innovatiINE mechanical skills This l project actually involved twoanpdhabsueislt Sinefworheicehvapleurastoinnngel | say tools a chamber was designteedsted without exposure to the dust could operate the tools being This dust chamber is illustrated generated during the procedure also included in the Appendix 1. and photographs are 30 in high 30 in vide in Figure The chamber is a glove box approximately end of the chamber through 8 ft long Air is drawn into one taking place and exits at through and the area in which the cutting is light dusts to the baghomun other end of the chamber carrying inside the chamber direct the dust laden aar post a dust that the dust generated B; saafmfplleesr open face membrane filter so Gloves are mounted during the fabricating operation is monitored attend the on both sides of the box so that two operators ch simitaneously for seful take . operation checked used to evaluate tools in the chamber The following procedure was was weighed and clamped to the tool The board to be fabricated from the vacuum cleaner was rest Air velocity pressure that it was between 3.0 and 3.2 in of mercury at a at the end of + 20 ft long to ascertain point 1/2 in behind a 5/8 in orifice bolted in place and the 2 in hose The side of the chamber was adjusted to an air velocity pressure air flow through the chamber adjusted measured in a 6 in d.sl downstream from the of 0.6 in of water of material linear in was cut in chamber , A measured quantity which dust counts by the membrane filter @ given time period during cleaned and reweighed and debris method were taken The board was of the chamber was collected and weighed cleaner or romaining in the bottom the vacuum the amount collected by From these weights material was usually very mall going to the baghouse baghouse