Regarding the selection of heat exchange tubes
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There is a scenario in which liquefied natural gas with a pressure of 8.0 MPa and a temperature of -169 degrees Celsius is involved; according to the specifications, welded pipes can be used. Is it necessary to use seamless pipes instead?
Under such high pressure and low temperature conditions, it is necessary to use seamless tubes for the heat exchange tubes.
Hello, are there any relevant standards?
For typical high-pressure pipelines at ultra-low temperatures, seamless pipes are of course the choice
It is best to use cracking seamless pipes that meet the 9948 standard; do not even consider fluid seamless pipes of type 8163, let alone welded pipes! !
This temperature of 9948 isn’t good either, right? Should GB/T 18984 or the American standard A333 be considered?
Refer to ASTM A320