Pressure Relief Device / Fire Explosion Vent

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ASME SECTION VIII DIV 1
Dry saturated steam	note) For pressure up to 1500psig apply the above equation, and for dry saturated steam pressures over 1500psig and up to 3200psig, the value of WT, calculated by the above equation, shall be corrected by being multiplied by the following factor.
Gas / Air
Liquid

Glossary of Terms
W_T	Mass flow rate	(lb/hr)
A	Practical outlet area in opening rupture disc	(in²)
P	Whichever is greater in ‘(Set pressure × 1.10) + atmospheric pressure’ or ‘set pressure + 3psia + atmospheric pressure’	(psia)
P_d	Back pressure(pressure at outlet)	(psia)
M	Mol weight
T	Absolute temperature at valve inlet, °F + 460°F	(R)
C	Constant for gas or steam based on specific heat ratio
K	Release coefficient (design coefficient, in general apply 0.62 for rupture disc and practical measure × 0.9 in real measurement, but it shall be less than 0.875.)
Z	Compressibility coefficient related to P and T (if there is no available data, Z=1.0)
W	Specific weight of liquid under the condition for valve inlet	(lb/ft³)

99, Seobu-ro 1293beon-gil, Juchon-myeon, Gimhae-si, Gyeongsangnam-do, Korea FDC Co., Ltd. TEL : +82(0)55-337-0852 FAX : +82(0)55-337-0858