Development of Criteria for the Control of Cutting and Cooling Fluid Mists.
Astleford-WJ; Register-JW; Johnson-JE
NIOSH 1975 Sep:133 pages
This report describes an experimental study of the collection and control requirements for oil mists that are generated by production machine tool operations. Twenty mist-producing machine operations were defined by field survey. Mist opacity was quantified using a light extinction meter. The six machines with the highest mist opacity readings included three grinders, two lathes and a milling machine. Mist envelopes were characterized by collecting discrete- point grab samples at fixed locations on the machines. Work station concentrations for a production lathe and an internal grinder exceeded the threshold limit value of 5.0 milligrams per cubic meter. All filters were analyzed for hydrocarbon content by infrared absorption spectrophotometry. A series of generalized mist capture experiments using a spray mist lubrication system indicated that the effectiveness of the local exhaust ventilation system was independent of stand-off distance and azimuth angle but was a function of generation rate and duct transport velocity. A duct transport velocity of approximately 2200 feet per minute and a capture velocity of 220 feet per minute were required for control of the atomized spray mist lubricants. Oil mist collection efficiency test were conducted on an electrostatic precipitator, rotating drum, fabric filter and a wet scrubber. Performance was defined as a function of air flow rate through the collector. (Contract No. 099- 74-0086)
NIOSH-Contract; Contract-099-74-0086; Tool-soldering; Machine-tools; Grinding-equipment; Cutting-tools; Lubricating-oils; Cutting-tool-industry; Control-equipment; Control-measures; Machining; Sprays; Hydrocarbons; Atomizers; Hazards; Standards; Lubrication; Foaming; Vaporization;
NTIS Accession No.
Southwest Research Institute, San Antonio, Texas, NIOSH Contract No. 099-74-0086, 133 pages, 30 references