Pressure vessel interface flange
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There is a problem with the flange on the pressure vessel itself; can the original flange be cut off and then a new one welded in its place?
It can be calculated; it can also be treated as a non-standard case.
Yes, but the maintenance and modifications must be carried out in accordance with the requirements specified in the regulatory standard TSG21-2016
For the post-4.0 waste heat boiler, the discharge port has a DN50 600LB flange; the graphite-wrapped gaskets used there tend to leak. I’m thinking of cutting away that convex flange and replacing it with a flat flange along with metal gaskets – I’m not sure if this is feasible
Repair and modification, qualifications and capabilities, weld evaluation, welders
Repairing pressure vessels is quite troublesome; first, it requires a qualified entity to carry out the assessment, repair work, inspection, and preparation of a report
Is the leakage caused by high temperatures, which lead to the oxidation of the graphite and thus leakage?
Follow the prescribed procedures; pressure vessels are considered special equipment