Laserfiche WebLink
Table 3. Organic Vapor Criteria and Responses. <br /> Concentrations Response <br /> <20 ppmv Organic Vapor(OV) Limited hazard,no special action. <br /> 20-100 ppmv OV Benzene detector tube measurements taken every 30 minutes <br /> 100-1000 ppmv OV Half-mask or full-mask OV respirators worn by all in work area. Benzene <br /> detector tube measurements taken every 30 minutes. <br /> >1000 ppmv OV Work stops;procedures taken to subdue excessive vapor levels(such as <br /> sprinkling cuttings with water or use of nitrogen gas flush). <br /> >20%LEL Work stops;procedures taken to subdue excessive vapor levels(such as <br /> sprinkling cuttings with water or use of nitrogen gas flush). <br /> >1 ppmv Benzene Half-mask or full-mask OV respirators worn by all in work area. Benzene <br /> detector tube measurements taken every 15 minutes until levels are below <br /> 1 ppmv(parts per million by volume). <br /> >10 ppmv Benzene Work stops;procedures taken to subdue excessive vapor levels(such as <br /> sprinkling cuttings with water or use of a nitrogen gas flush). Benzene <br /> detector tube measurements taken every 15 minutes until concentrations <br /> are below 1 ppmv. <br /> Note: Organic vapor(OV)measurements are to be taken in the breathing space within the work zone. <br />