Pig Launcher and Receiver
Pig Launcher and Receiver
(OP)
Guys,
I am aware that pig traps are designed based on ANSI B31.4 for pure liquid service and ANSI B31.8 for gas service. But I came across a vendor manual that informs that the pig trap was constructed according to ASME VIII, Vessel code. Has anyone encountered this? If yes, what are the differences between using the ANSI-31.4/31.8 compared to using the ASME VIII code.
I am particularly interested in knowing why would ASME VII code be used for the pig trap design/construction.
I am aware that pig traps are designed based on ANSI B31.4 for pure liquid service and ANSI B31.8 for gas service. But I came across a vendor manual that informs that the pig trap was constructed according to ASME VIII, Vessel code. Has anyone encountered this? If yes, what are the differences between using the ANSI-31.4/31.8 compared to using the ASME VIII code.
I am particularly interested in knowing why would ASME VII code be used for the pig trap design/construction.





RE: Pig Launcher and Receiver
In ASME B31.4 and B31.8 (it is ASME and not ANSI)the trap is considered to be a fabricated piping assembly.