API Piping Design Formula

[Joli21]

What is the Maximum Allowable working pressure formula for the API pipe?

 

[XELR8]

P = (2*S*E*t)/(D-2*y*t)

There are many design examples on the web.

 

[Joli21]

This formula is set forth in ASME B31.3 para 304.1.2 , I am looking for API formula.
By the way, S (Allwoable STress Value) must be selected as 0.8 X Minimum Yield strength or only Minimum Yield strength . please refer me to the clause of the code.
tnx

 

[BigInch]

Joli21,

Allowable stress is as tabulated for the listed approved materials. It is NOT = 0.8 * SMYS

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[stanweld]

Joli21,
You are confusing lacation safety factor F with API design factor. Under the alterantive rules provisions of Part 192 F may = 0.80 maximum. Use ASME B31.8 for design if gas. It must be understood that when one designs with F = .80, additional testing and inspections of pipe, pipe line welding and the pipeline during service are mandated.