I also have a question about the flange sealing surface
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The tubular direct heating furnace used in crude oil transportation, with a design pressure of 10 MPa, should it be classified as a high-pressure pipeline? So, for flanges of type HG 20592, which are necked butt-welded steel pipe flanges, should an annular joint surface be chosen to address sealing issues? Should octagonal or oval gaskets specified in HG20612-97 be chosen for the gaskets? Please give me some advice. Thank you
Since the design pressure reaches PN10.0 MPa, the pipeline series is of the European system; the flanges comply with HG20595-97, the sealing surfaces are ring-type connections, and the gaskets used are octagonal or elliptical gaskets as specified in HG20612-97. The pipeline series follows the American system; the flanges are in accordance with HG20617-97, the sealing surfaces are ring-type connections, and the gaskets used are octagonal or elliptical gaskets as specified in HG20633-97.