Acceptance specifications for PTFE-lined steel pipes
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I checked several acceptance specifications, and none of them mention whether vacuum or high-temperature tests are required; however, it is indeed possible for vacuum and high temperatures to cause damage to the lining. Which expert is aware of the relevant standards? Thank you!
It is only known that PTFE-lined steel pipes are inspected in accordance with the HGJ92-90 and GHJ33-91 standards; no relevant provisions can be found in the specifications. It is recommended to contact the relevant manufacturers to obtain the standards.
The Code for Design of Industrial Metal Piping GB50316 stipulates that the maximum temperature of the medium inside polytetrafluoroethylene-lined steel pipes shall not exceed 200 degrees.
1# Deep sea: This requires coordination with the manufacturer; if there are issues with the lining, it’s difficult to detect them on-site. The key is to have some form of control over the manufacturing process
Acceptance is generally done through spark testing. There are no requirements regarding vacuum; it depends on your operating conditions.