Technical issues regarding convex face flat-welded steel pipe flanges
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Is it already clearly indicated in the technical specifications for convex-face flat-welded steel pipe flanges where the machining line should be located? ? ? I read on the forum that regarding the waterline issue, it is stated that there are no regulations set out in the new standards. Our construction drawings are based on JB/T81-94; would like to confirm this? Is it okay without a waterline? ? ?
HG20592 does not impose any mandatory requirements regarding the presence of fine grooves on convex flanges; in fact, most convex flanges in use do not have such fine grooves, and the absence of them does not cause any problems.
HG20592 has no strict requirements for machining serrated water lines; it only states that machining is possible. For raised-face flanges with PN≤4.0MPa, non-metallic flat gaskets are used ； When polytetrafluoroethylene-coated gaskets and flexible graphite composite gaskets are used, tight-pattern water lines can be machined, with the sealing surface code being RF (A)”