Issues regarding the design of LNG cryogenic pipelines
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There is a statement in the gas manual: For pipelines operating below zero degrees, 8-character blind plates should not be used; gaskets or plug plates should instead be employed ? Why? Additionally, for pipes of DN40 or larger, butt welding should be used, while socket welding is preferable for pipes smaller than DN40. I’ve also seen in some equipment that DN50 pipes use socket welding
It’s not only specified in the gas manual; GB50316 also contains this requirement. It’s not just the plug or gasket, but both the plug and the gasket