Safety Relief Valve Vapor Flow Capacity Formula
Safety Relief Valve Vapor Flow Capacity calculates valve vapor weight flow capacity for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (B_v, C_v, K_o, A_orifice, P_rel, M_gas, Z, T_in) are known and the assumptions behind the cited well performance relationship match the engineering case being checked.
Assumptions
- Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
- The declared units match the field-unit constants used in the formula.
- The cited formula applies to the selected petroleum engineering workflow.
Limitations
- The calculation does not replace a full engineering model or operating procedure.
- Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.
Common mistakes
- Mixing unit systems without converting the inputs.
- Using default example values as field recommendations.
- Applying the formula outside the source assumptions.
Default example
Using the default inputs, w_relief equals 31,447.114462 lb/h.
356
0.9
0.85
0.5
1200
18
0.9
540
Inputs
B_v
dimensionlessConversion Constant
C_v
dimensionlessSpecific-Heat-Ratio Flow Coefficient
K_o
dimensionlessValve Discharge Coefficient
A_orifice
in2Effective Discharge Area
P_rel
psiUpstream Relieving Pressure
M_gas
dimensionlessGas Molecular Weight
Z
dimensionlessGas Compressibility Factor
T_in
RInlet Temperature
Outputs
w_relief
Valve Vapor Weight Flow Capacity
A_orifice
Effective Discharge Area
P_rel
Upstream Relieving Pressure
Source and review
reviewedGas Conditioning and Processing, Campbell, J. M. (1992)
John M. Campbell. 1992. Gas Conditioning and Processing, Campbell Petroleum Series, Vol. 1, Page 296.
Source