Safety relief valves sizing in vapor services
Input(s)
C: Specific Heat Ratio (dimensionless)
\(\mathrm{K}_{\mathrm{o}}\): Valve Discharge Coefficient (dimensionless)
A: Effective Discharge Area (in. \({ }^{2}\) )
B: Conversion constant (dimensionless)
P: Upstream Relieving Pressure (psi)
M: Gas Molecular Weight (dimensionless)
Z: Compressibility Factor (dimensionless)
\(\mathrm{T}\): Inlet Temperature (R)
Output(s)
w: Weight Flow Through Valve (lb/h)
Formula(s)
\[
\mathrm{w}=(\mathrm{B}) * \mathrm{C} * \mathrm{~K}_{\mathrm{o}} * \mathrm{~A} * \mathrm{P} *\left(\frac{\mathrm{M}}{\mathrm{Z} * \mathrm{~T}}\right)^{0.5}
\]
Reference(s)
John M. Campbell, Gas Conditioning and Processing, Campbell Petroleum Series, Oklahoma, 1992, Vol. 1, Page: 296.