Production EngineeringWell Performance
ASME Separator Pressure Criterion - Internal Radius Formula
ASME Separator Pressure Criterion - Internal Radius calculates allowable separator pressure for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (S, E, t, R_i) 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, P equals 664.0625 psi.
Spsi
20000
Efraction
0.85
tft
0.08
R_ift
2
Inputs
S
psiMaximum Allowable Stress
E
fractionJoint Efficiency
t
ftShell Thickness
R_i
ftInternal Shell Radius
Outputs
P
psi
Allowable Separator Pressure
t
ft
Shell Thickness
R_i
ft
Internal Shell Radius
Source and review
reviewedJohn M. Campbell. 1992. Gas Conditioning and Processing, Campbell Petroleum Series, Oklahoma, Vol. 2, Page 64.
SourceRelated formulas and calculators
Effective Wellbore Radius of a Well in Presence of Uniform Flux Fractures
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Effective Wellbore Radius of a Horizontal Well – Method 1 (Anisotropic Reservoirs)
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Effective Wellbore Radius of a Horizontal Well – van der Vlis et al. Method
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