Field performance measurements of half-facepiece respirators: steel mill operations.
Ambient and in-facepiece samples to evaluate the protection provided by negative-pressure, half-facepiece respirators were collected on workers in different areas of a steel mill including a sinter plant and a basic oxygen process shop. Protection was assessed by workplace protection factors (WPF). All the in-facepiece concentrations were dramatically less than the corresponding ambient concentration levels or permissible exposure limits. The geometric mean (GM) ambient and in-facepiece concentrations of iron were found to vary among tasks. Significant differences were also found to occur between the GM ambient exposure levels in which some of the respirators were used. Significant differences in respirator performance as measured by WPF or in-facepiece iron concentration were observed among different brands of respirators. For all job classifications and at all levels of airborne exposure, the fifth percentile estimates for the WPF distributions for each brand of respirator were all greater than 20.
Myers
W R
WR
Department of Industrial and Management Systems Engineering, West Virginia University, Morgantown 26506, USA.
Zhuang
Z
Z
D000395:Air Pollutants, Occupational / Q000032:analysis*; D002118:Calcium / Q000032:analysis; D004391:Dust / Q000032:analysis; D004784:Environmental Monitoring / Q000379:methods*; D006801:Humans; D007501:Iron / Q000032:analysis; D007587:Job Description; D008452:Maximum Allowable Concentration; D008669:Metallurgy; D010316:Particle Size; D012134:Respiratory Protective Devices / Q000592:standards* / Q000600:supply & distribution; D016037:Single-Blind Method; D013232:Steel
D000395:Air Pollutants, Occupational; D004391:Dust; D013232:Steel; D007501:Iron; D002118:Calcium