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Static pressure requirements for ventilated enclosures.
Heitbrink WA; Thimons ED; Organiscak JA; Cecala AR; Schmitz M; Ahrenholtz E
Progress in modern ventilation. Proceedings of the Ventilation 2000-6th International Symposium on Ventilation for Contaminant Control, June 4-7, 2000, Helsinki, Finland. Niemela R, Railio J, Sundquist E, Tahti E, eds. Helsinki, Finland: Finnish Institute of Occupational Health, 2000 Jun; 2:97-99
Environmental enclosures on vehicles protect workers from pesticide exposures during air blast spraying and dust exposures during surface mining operations. One or more fans draw air through filters to remove· air contaminants and force clean air into an enclosure at some minimum static pressure. Air flows out a cab through either a baffled outlet port or leaks in the enclosure. Enclosures also have holes for electrical and mechanical connections. Because the vehicles are used in open environments, ambient wind may cause air infiltration to increase when the wind's velocity pressure, is greater than the static pressure in the enclosure. Thus, the effects of velocity pressure and enclosure static pressure upon the exposure reduction obtained by an idealized enclosure were evaluated. The results in Figures 2 and 3 are consistent with the hypothesis that contaminant penetration into an enclosure occurs when wind velocity pressure exceeds the static pressure in the enclosure. Environmental enclosure manufacturers should include enclosure static pressure and maximum ambient wind speed as equipment specifications. In their equipment manuals, manufacturers should warn that air contaminant infiltration into enclosures can increase when the enclosure is used in the presence of excessive ambient wind or when the enclosure static pressure is inadequate. Enclosures should be maintained so that adequate static pressure is maintained in the enclosure.
Mining equipment; Mining; Mining industry; Dusts; Dust exposure; Dust particles; Pesticides; Pesticides and agricultural chemicals; Enclosed cabs; Agricultural machinery; Air flow; Air pressure
Niemela R; Railio J; Sundquist E; Tahti E
Progress in modern ventilation. Proceedings of the Ventilation 2000-6th International Symposium on Ventilation for Contaminant Control, June 4-7, 2000, Helsinki, Finland
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division