NIOSH hazard controls HC23 - controlling silica dust from foundry casting-cleaning operations.
NIOSH 1997 Dec; :1-2
The control of silica dust (14808607) generated from the cleaning of foundry castings was reviewed. Foundry workers who cleaned small castings produced from sand molds with handheld chipping and grinding tools were exposed to respirable silica dust. Such chronic exposures could result in silicosis. A specially designed local exhaust ventilation (LEV) system was essential for the effective control of silica dust exposure. The LEV system was composed of a downdraft ventilation booth equipped with a turntable for easy and safe handling of castings. The system worked by enclosing and pulling air contaminants downward through a large grate opening on the surface of the work table. Air flowed through the system at a rate of 5,600 cubic feet per minute, a rate well in excess of the recommended face capture velocity of 200 feet per minute. This LEV system was shown to reduce workers' exposure to respirable silica dust by 59 to 77%.
Occupational-exposure; Silica-dusts; Respirable-dust; Airborne-dusts; Dust-exposure; Dust-control; Dust-control-equipment; Ventilation-systems; Exhaust-ventilation; Occupational-respiratory-disease; Foundry-workers
Numbered Publication; Hazard Control
DHHS (NIOSH) Publication No. 98-106; HC-23
National Institute for Occupational Safety and Health