LNG pipeline pressure testing
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Can compressed air be used for strength testing of LNG pipelines with a design pressure of 1.0 MPa? CJJ33-2005 stipulates that pipelines with a design pressure greater than 0.8 MPa must undergo strength testing using clean water. But many posts online say it’s very difficult to purge and dry LNG pipelines using water for pressure testing. Would using air for the test violate the specifications?
Refer to page 35 of the standard GB 50184-2011 for pneumatic testing
Tests should be conducted using clean water; if compressed air is to be used for testing, permission from the owner must be obtained first.
It’s difficult to dry them out; it’s all just excuses. It’s the construction teams who don’t want to carry out the drying process and thus try to deceive the homeowners. Gradually, many people came to assume this as the norm. Ask that construction team whether they actually have drying equipment for drying It’s really hard to believe when lying to laypeople – how come so many designers say the same thing these days!