Development of push-pull ventilation criteria.
NIOSH 1982 Dec; :1-24
The push/pull relationships of an open surface tank ventilation configuration were tested. Slot type push jet nozzles with openings between 6.3 and 19 millimeters (mm) and tank widths from 0.91 to 1.8 meters were used to evaluate push jet velocities. The test tank was 1.2 meters long, with a simulated fluid free board height at 152mm. Push air flows ranged from 0.02 to 0.04 cubic meters per second per meter of nozzle length. Side panels were removable. Velocity profiles and exhaust flow necessary to capture the push jet were investigated. The slot type nozzle achieved push jet velocities well within the values of 0.25 to 0.76 meters per second. Exhaust flows less than 50 percent of currently recommended flows captured the jet flow. The authors conclude that the effective use of a push/pull system or any ventilation system requires consideration of workplace and process parameters, such as room air currents and the effects of part handling in the tank area.
NIOSH-Author; Air-quality-control; Air-conditioning; Dust-control; Fumes; Safety-equipment; Industrial-hygiene; Exposure-levels
NTIS Accession No.
Division of Physical Sciences and Engineering, NIOSH, U.S. Department of Health and Human Services, Cincinnati, Ohio