What should I pay attention to when replacing the flange gasket?

What factors should be paid attention to when replacing the flange gasket?
The first is disassembly. When replacing the flange gasket, care should be taken to avoid damaging the surface of the flange connection.
When replacing the gasket, gaskets with the same material, specifications and sizes should be selected.
After replacing the gasket, a pressure test should be performed to ensure that there is no leakage after the gasket is replaced.
When using, check whether the flange connection is in good condition, and handle any abnormalities in a timely manner.