PIG LAUNCHER AND RECIEVER

[shamnas]

Dears,

which code and spec to follow PWHT for Pig launcher Materials,

As per ASME B 31.3 for Hydrostatic test pressure what is the equation we have to follow,
I have seen two equation,
Test Pressure = 1.5 design pressure
or
Test pressure = (1.5 x design pressure x allowable stress at test temperature) / Allowable stress at design temperature.

which test pressure we follow as per UG 99

Thanks and Regards

 

[BigInch]

Pig launchers are for pipelines and therefore not covered by B31.3
See B31.4 or B31.8
B31.4 and B31.8 requirements for pig launchers are not the same.

 

[LittleInch]

I agree, you should not be designing your pig trap as a pressure vessel. This way will lead to thicker wall than the pipeline and increased potential for the pig to get stuck on launch or receipt.



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