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I would add that check valves are common in oil pipelines at pump stations to allow direct flow to bypass the pumps and a pig to pass through. You definitely need to make sure that the check valve is thru-conduit and fully piggable however. If the proper type of check valve is used (and is...

Another good reason to have the inner ring - If this is in a pipeline that is pigged, - the pig can snag the inner winding of gasket (if it doesn't have the inner ring) and literally pull the whole winding though the pipeline. Then eventually you get a ball of wire coming out the other end of...

Hello all, Was wondering if anyone could share their inspection practices for mechanical float-type liquid level switches. We have some tanks fitted with a chain that can be used to pull the float up and test the signal, but there are concerns that the mechanical linkage may not go back to...

Thanks Biginch. Yes, I'm primarily dealing with liquid pipelines under DOT jurisdiction; I failed to mention that. I'm just not sure how industry has justified NOT having code stamps on pig traps and other applications such as strainers and meter provers (in jurisdictional systems). Seems...

thread378-208519 Hoping to continue discussion of the referenced thread. Specifically regarding pig trap doors and filter vessel closures, the DOT regs (49 CFR 195.124) state that closures must comply with the ASME BPV Code Sect. VIII Div 1. Sect. The BPV Code sect UG-115 appears to require...