.... hydraulic fracturing proppant worker exposure fracturing materials respiratory protection particle crystalline silica fracturing fluid exposure flow rate exposure assessment national institute upstream oil & gas us government occupational exposure occupational safety and health...

... an appropriate media. Personal sampling pumps are small, battery-powered, vacuum pumps which can be calibrated to a specified flow rate, typically between 0.05 and 4 liters per minute (LPM), and can either be worn at the waist of a worker or set in the general area around a worker. High volume sampling pumps...

...) at constant pressure. T1 and V1 are temperature and volume in a fume hood during a general process at ambient conditions. T2 and V2 are temperature and volume in the fume hood exhaust duct during a hot process, whose change in volume flow rate matches the volume generating process. T2 = 2 1 1V V T× at STP (T1...