Method 2: Sizing for SUBCOOLED LIQUID AT THE PRESSURE RELIEF VALVE INLET liquid density at the PRV inlet (lb/ft3). lo = density evaluated at 90% of the saturation (vapor) 9 = pressure corresponding to the PRV inlet temperature Ps (lb/ft3). For multi component system, use the bubble To point pressure corresponding to for When To Ps. determining the flash calculation should be carried out 9, isentropically, but an insenthalpic (adiabatic) flash is sufficient. pressure at the PRV inlet (psia). This is the set = pressure (psig) plus the allowable overpressure (psi) plus atmospheric pressure. saturation (vapor) pressure corresponding to (psia). Pa = To For multi component system use the bubble point pressure corresponding to To. volumetric flow rate (gal/min). Q = total backpressure (psig). Pa = relieving temperature (R ). To =
Method 2: Sizing for SUBCOOLED LIQUID AT THE PRESSURE RELIEF VALVE INLET lo = liquid density at the PRV inlet (lb/ft3). 9 = density evaluated at 90% of the saturation (vapor) pressure Ps corresponding to the PRV inlet temperature To (lb/ft3). For multi component system, use the bubble point pressure corresponding to To for Ps. When determining 9, the flash calculation should be carried out isentropically, but an insenthalpic (adiabatic) flash is sufficient. = pressure at the PRV inlet (psia). This is the set pressure (psig) plus the allowable overpressure (psi) plus atmospheric pressure. Pa = saturation (vapor) pressure corresponding to To (psia). For multi component system use the bubble point pressure corresponding to To. Q = volumetric flow rate (gal/min). Pa = total backpressure (psig). To = relieving temperature (R ).