What are the causes of vertical crack leakage at the weld between the tube sheet and the shell of a tubular heat exchanger? (Equipment pressure: 4.0 MPa, temperature: 400
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What is the cause of vertical crack leakage at the weld between the tube sheet and the shell of a tubular heat exchanger? (Equipment pressure: 4.0 MPa, temperature: 400°C)
It is likely not caused by stress corrosion; at 400°C and 4.0 MPa, the cylinder is probably meeting the heat treatment requirements. Weld cracks are likely due to welding or heat treatment issues, or problems with the material of the tube sheet and shell
Was the welding sequence taken into account during manufacturing? Check whether the welding process is correct, and whether the actual welding is in line with the specified process
Let’s first take a look at what material it is And whether the welding specifications are correct
Should we consider the graphitization tendency of carbon steel, given that it is used at high temperatures of over 400 degrees for extended periods of time, under rather harsh conditions?