Can a weld joint be exempted from the hydrostatic (strength) test?
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This post was last edited by ZHANGZHANTJ on 2015-9-14 18:04. Medium: Natural gas. Operating pressure: 5.0 MPa. Flange pressure rating: 600 LB. Pipe size: 6". There is only one weld joint between the pipe and the flange; is it necessary to conduct a hydrostatic (strength) test? Is it okay to just do flaw detection?
This should be possible while ensuring quality.
With the approval of the owner and designer, 100% flaw detection can be used as a substitute
According to the regulations, flaw detection must be successful first before a hydrostatic test can be carried out.
Flaw detection is used to identify defective welds, while hydrotesting assesses the overall safety of the pipeline, not just the weld areas. A hydrostatic test is essential, right? .
With the approval of the designer and supervisor, 100% non-destructive testing can be used as a substitute.
It’s possible, but flaw detection must be carried out
It is okay to do only flaw detection. . . . .
For flaw detection, using radiation is the best option; it provides photographic records and offers high precision
I would like to ask everyone: Since the strength of the flanges and pipes is specified at 600 LB and only flaw detection is performed, does that mean it’s sufficient to ensure that there are no issues with the welds?
Such high pressure, and it is a flammable and explosive medium: a pressure test is necessary