Document 0gVY4e7Zv4jw69qy2R7KVGNJm

4TH QUARTER, 1984 INDUSTRIAL HYGIENE - S. W. ELLIS "JM Unit a. Asbestos Removal Work continues on replacing all asbestos insulation with non-asbestos insulation. Removal and replacement has been completed in Pumping and Purification buildings. Compression building. Tank Farm, Blending building and Catalyst Preparation building and at the flare tower. b. Shutdown Monitoring Eleven areas in "J" Unit were monitored for Hydro carbons and Carbon Monoxide prior to vessel entry work during the 1984 annual shutdown. All results were 0 ppm. c. Additive System Ventilation Semi-annual monitoring was done on the additive mix tank ventilation system. Air velocity results were below the minimum acceptable velocity of 1680 fpm on two of three vents. A program has been initiated to bring the velocity above the minimum. ' Carbon tube monitoring for Hydrocarbon exposure while mixing AO-6 results were 0.28 ppm 8 hr TWA, well below the TLV. d. Ethylene Compressor Motor-noise Reduction The 1250 H.P. ethylene compressor motor was replaced with a 2000 H.P. motor during the annual shutdown. Noise measurements indicate a significant reduction in noise levels. Results were from 87 to 91 dBA which is still above the 87 dBA maximum. DUP 0814505 "SAFETY IS MY RESPONSIBILITY" p\J 009863 4TH QUARTER, 1984 INDUSTRIAL HYGIENE - S. W. ELLIS II. "F" Unit a. Auxiliary Air Compressors Two auxiliary air compressors have been installed at "F" Unit. 87 dBA noise contour lines have been established. They extend 8 ft. to the North of the foundation and 2 ft. to the East. b. Low Pressure Separator Stripping The unit was shut down while producing an 8.9% vinyl acetate copolymer. Monitoring for vinyl acetate exposure while hot stripping indicated a maximum of 0.5 ppm 8 hr. TWA. The TLV is 10 ppm 8 hr. TWA. DUP 0814506 "SAFETY IS MY RESPONSIBILITY" Du 009864 4TH QUARTER, 1984 INDUSTRIAL HYGIENE - S. W. ELLIS II. Alathon* Mechanical a. Bldg. 582 Shop, Dip-Seal Vat A COD to install a vent hood over the dip-seal vat was completed. The average air velocity was 77 FPM. The minimum is 60 FPM. DUP 0814507 "SAFETY IS MY RESPONSIBILITY" DU 009865 4TH QUARTER, 1984 INDUSTRIAL HYGIENE - S. W. ELLIS IV. Alathon* Lab a. Plant Ambulance The Alathon* Laboratory has the responsibility of operation and maintenance of the plant ambulance. An article in Science News Volume 126, made the 550 Lab aware of possible exposure to Carbon Monoxide. The Du Pont Acceptable Exposure Limit for Carbon Monoxide is 50 ppm-8 hr. Time Weighted Average, and 25 ppm-12 hr. Time Weighted Average. The American Conference of Governmental Industrial Hygienists calls for a Short Term Exposure Limit of 400 ppm. Last week a new exhaust system was installed on the Ambulance. The 550 Lab ambulance crew drives the vehicle off-plant on a weekly basis. They monitored the ambulance on Saturday, December 8, using a calibrated Drager Meter with a Carbon Monoxide 5/C Drager Tube in line. (Calibrated 12-7-84) Conditions CO Check Near Stretcher (Back of Ambulance) Engine Idling (10 mins Low Speed (30-35 mph) High Speed (50 mph) 5 ppm CO 1 ppm CO 0 ppm CO Results show that Carbon Monoxide levels are well below TLVs. A CO check on the ambulance will be set up on Victoria Plant's computer tickler system, and levels will be checked every six months. DUP 0814508 "SAFETY IS MY RESPONSIBILITY" DU 009866 4TH QUARTER, 1984 INDUSTRIAL HYGIENE - S. W. ELLIS V. Shops and Services a. Waste Paint Thinner Disposal Approximately 5000 gallons of paint thinner that had accumulated since the incinerator was shut down was burned in #7 and #8 boilers. Monitoring results indicated there was no personnel exposure. b. Welding Fume Ventilation - Bldg. 31 The Building 31 welding fume ventilation system is complete except for installation of vent fan. c. Welding Fume Ventilation - Bldg. 4 The Rumemelin vent system was monitored on December 20, 1984. All seventeen cones had a velocity greater than the minimum required. DUP 0814509 "SAFETY IS MY RESPONSIBILITY" DU 009867 4TH QUARTER, 1984 INDUSTRIAL HYGIENE - S. W. ELLIS VI. Diamine - East a. Power and Hydrogen, Noise Survey The annual noise survey was completed on November 21, 1984. b. HMD - HMD Monitoring Monitoring results from several of the locations suspected to have HMD exposure were all 0 ppm. c. D&R - Asbestos Monitoring Asbestos removal practices continue to meet standards samples at the north perimeter fence were all less than .009 fibers/cc > 5 microns in length. The AEL is .5 fibers/cc > 5 microns in length. SWE/kp DUP 0814510 "SAFETY IS MY RESPONSIBILITY" DU 009868