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Dry saturated steam |
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Gas / Air | ![]() |
Liquid | ![]() |
WT | 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) |
Pd | 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
← → Scroll left and right ![]() |
|
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) |
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