Selection of metal wound gaskets for RF face flanges
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The upper flange of the spherical tank, designed for a pressure of 2.5 MPa, has an RF surface. According to information from Baidu Wenku, for flanges with pressures below 6.3 MPa and an RF surface, metal wound gaskets of type C or D can be used, either with an inner ring only or with both an inner and an outer ring； However, due to installation issues with the metal wound gaskets used in our safety valves’ inner and outer rings, multiple valves began to leak; after switching to fully flat metal wound gaskets, the leaking problem was resolved. Is this appropriate?
“Do you mean a \"flat metal wound gasket\" as the basic type of wound gasket (Type A gasket)? In principle, it can be used in that way. How do on-site workers determine the cause of the leak? Further exchanges are welcome.
What kind of “installation technical issue”? This is also worth discussing!
It’s not easy to align using type A, right? It should work though
It is related to the quality of the gasket; according to foreign standards, RF flanges can be used in a hydrogen-rich environment of 1500 BL. But domestic designs usually use RJ; it’s just that the manufacturing process isn’t good enough. In your case, it is best to use gaskets that match the flanges; as long as the quality of the gaskets is good, there will be no leaks. If there is no more leakage, production can be maintained temporarily; during the next maintenance session, the flange and gaskets should be replaced together.