Document zd265pgG2xOM83rD3QL7onVag

$c>~J f . Mr, J. M. Butcher Mr, H, F. Hyro Mr. N. H. Kefchom June 27, V.-72 I'i&ClI \ZElL_, JUN 2 8 1972 Air Sofrpling for Asbestos / ''Hi , . ; , st-, ' . " UfttT L'Se- by t r*) - "'tf/i/, Gentlemen i The attached memorandum contains results for samples that were taken to measure airborne asbestos in the breathing zone of an electrician while working with asbestos tope on heating coils. Even though one result exceeded 5 fibers greater than 5 microns in length par milliliter, this operation is of such short duration that the limit; es tablished by GSHA ore not exceeded. Continuous work on assembly-line scale could create excessive quantities of fibers In air. Note that the greater quantity was received while stripping the tape into strings. The fact that asbestos fibers do become airborne even when working with the tape Indicates that precautions, and even wearing of respiratory protection, should be practiced when working with the material. Yours truly, F. v^lll lams/ebc Aft. UCC 000343 MEMORANDUM To: From: Mr. Fred /i I Harm 791 - 25 Industrial Hygiene June 20, 1972 communications cof?x f Destroy after use, by tearuMbf Subject: Air Sampling Results During the Use of Asbestos Tape on Heating Coils SUMMARY Two "Personal" air samples were collected to measure asbestos ' fibers during fabrication of a heating coil on a length of pipe. An additional "Personal" air sample was collected during the removal of a heating coil from a length of pipe. Both operations were performed in the electriabl shop located In Building 770. Two of the air samples were below the Threshold Limit Value of 5 fibers per milliliter greater than 5p in length. One sample, while exceeding the TLV, did not exceed the limit of 10 fibers, greater than 5/u In length, permitted up to a total of 15 minutes in an hour for up to 5 hours in an 8-hour day as stated in Section 1910.93a of the Occupational Safety and Health Standards. DISCUSSION On April 24 and 26, 1972, the Industrial Hygiene group monitored airborne asbestos fiber resulting from winding 1 inch asbestos insulating tape during the fabrication of a heating coil on a length of pipe. Due to the short periods of time involving actual work with asbestos, the time for each operation was accumulated on each filter to obtain a representative sample. The heating coil was placed between alternating layers of insulating "mud" and asbestos tape, allowing drying time for each layer of "mud." To secure the heating coil windings, a piece of 2 inch asbestos tape was separated into "strings" approximately 18 inches in length. A "Personal" air sample was collected during this procedure. This operation was carried out over an exaggerated time period to provide a more accurate air sample. One "Personal" air sample was collected during the removal of a "used" heating coil from a length of pipe. The asbestos tape, embedded in dry insulating "mud," was forceably removed by the use of a ball peen hammer. Chemical grade asbestos listing tape, 1 inch by 1/16 inch, and JohnsManvilie No. 1091 asbestos tape, 2 inch by l/16 inch, was used by Services Department electricaf *he work was performed. The airborne fibers were collected using membrane paper, type AA, O.i^j pore diameter, white, 37 mm in size, a 2 Ipm flow rate. The samples were delivered to the R&D Environmental Health Laboratory for analysis. UCC 000344 -2- RESULTS AND CONCLUSIONS The attached data sheet shows asbestos fibers to be present in concentrations that do not exceed the limits as set forth in Section 1910,93a of the Occupational Safety and Health Standards during the fabrication of a heating coil on a length of pipe * The results indicate that heating coils of this nature may be fabricated without undue concern for health infuries, to those who perform the operation, from inhalation of airborne asbestos fibers when normal precautions are observed. The cooperation in scheduling and performing the fabrication work is acknowledged and appreciated. / / R.O.MIdklff/ebc Att, UCC 000345 USE OF ASBESTOS TAPE ON HEATING COILS BUILDING 770 ELECTRICAL SHOP ' Sampled by: R. O. Midkiff Sampl ing Time (Minutes) 9 5 13 Flow Rate^PfuJ Operation Fiber/ml / >5m in length/ 2 Winding 1" asbestos tape 0.7 2 Stripping 2" asbestos tape into tie strings 5.2 2 Removal of osbecto* tape from used heating coll with hammer 1.5 Electrician: UCC 000346 Z&-. /tjn / s' Mu si J.:, , j' Ji .-dcju. . ft.. ft ^Jis^sLc,,. JiAsi/J~jUC^ ' (jjJ\ ^Cc- )i yj ' -i : ' / F'fUU, 5Uiv'i'v3(\v sj. 0.M f-sjUs u i y. lix iXj-c. &! Mlua--id-o jcCuuLj-H, >; $ 11.< C-^nLily C A .. r^yxj-' (Msl -a UsU/U ^-CjCtUCc cjtftM cLbi^i .*_ '^\XscS^y^1 'U 0-- JL^tL &/r~ CisdhJj^Mftvd^ ^JL-' 'L>sU CsCs^ v -hft^X '^'^KjlcJLl-cP sMoj'Us\^ Mb Jlst) ^ t Msucjtu^^ CMM v. 5l tu tj/^uyiftL , duA ustAjL tj.' > ` cri iM MisMlM *770 luo-c 7/ MM ftAssi UU >j of'-tn' -jf 0 tr^ 77 Msjju -w *u>f? JyssUtA &; Lc Mu >> sjLLjLbz/ ^su.< < fcui. 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