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Thanks guys. Hitokiri you are correct the 'unless otherwise agreed' clause exempts gas (as does the compressibility of gas as you would have to overpressure piping to overpressure valve cavity...) - classic vague code where they say fluid but gas is essentially always exempt. Hitokiri, there...

Do DIB-1 valves ALWAYS require a means of relieving cavity pressure (either automatically or manually as per API 6D)? My confusion is, for liquid service there should always be an LRK as thermal expansion is likely, but in gas service, is a means of relief required? API 6D is kind of vague as...

Hello, Could anyone provide insight into the operability of process monoflanges used for DBB PIT isolation (to replace 2" DIBs or the typical three-valve config.). Also, could someone suggest any preferred suppliers? I know Shell uses the Multi-instruments brand, and my ASME B31.3 instructor...

Hello, Could anyone tell me why an RTJ flange would be the preferred option for a molecular sieve in a sour gas plant, or allude to any other applications for these flanges besides the typical #2500 class and greater applications specific to sour service? Thanks!

Sorry folks....can anyone tell me how to start a thread? May sound ridiculous by I have absolutely no idea how to start a new thread/ask a question on this website. Thanks