standard to meet welding procedure?

[juliomendez]

wich kind of standard are mandatory to fullfill the welding procedure in piping system?.
Such as:gas piping,naphta piping and more.

 

[metengr]

ASME B31 Piping Standards should be used, when possible. Mandatory use is up to the Owner to enforce and/or local Jurisdiction or government body rules.