Problems with hydrogen pipeline fittings
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There is currently one hydrogen pipeline with a diameter of DN40 and a pressure of 5.0 MPa. At a junction point, instead of using a tee fitting, a hole was made and welded directly. I would like to ask the experts whether this approach is acceptable? Are there any relevant standards that specify the use of fittings instead of openings?
There really is such a rule; I can’t remember it right now. See if by checking the contract, we can find the standard he is relying on.
Thank you; could you please think again about the specific specifications so that there is a basis for them?
Generally, when signing a contract, there should be relevant reference documents; check the facts. Hehe, I’m retired and at home now; the original documents are no longer available. Sorry. Oh, try searching on Baidu for information on the installation standards for chemical pipelines; it’s worth giving it a try.
It is recommended to use a tee; welding directly is not reliable
According to 5.1.7.3 of GB20801.3, when a branch pipe is welded directly to the main pipe, pressure design (reinforcement calculations) shall be carried out.
A three-way valve costs just a few dollars; the pressure is as high as 5 Mpa, and hydrogen is such a dangerous medium. It’s not worth leaving potential problems behind
This pipeline was constructed by the original team, and this issue was raised during the renovation; efforts are currently being made to resolve it