Pressure vessel pressure testing
Thread Content
The pressure in the tube side of the medium-temperature heat exchanger is 2.2 MPA, and that in the shell side is 2.3 MPA. Currently, there are leaks in this vessel, and pressure testing is intended to locate them. May I ask what the maximum pressure should be when filling the shell side with water? The internal heat exchange tubes are 19*2 stainless steel tubes. Is the pressure rating of stainless steel pipes 2.2 MPa or 0.1 MPa? :L :L :L
Just use the shell-side test pressure to check for leaks.
If what LZ is referring to is work pressure, the pressure during leak testing can reach around 2.5 MPa, so there’s no need to worry about the stress-bearing capacity of stainless steel pipes: lol.
It will be carried out on site just like that, and there should be no problems
Just use the shell-side test pressure for the test
When designing a container, there are design pressures and hydrostatic test pressures for the shell side; this test pressure takes into account the stress on the heat exchange tubes due to external pressures, so it should be based on the hydrostatic test pressure of the shell side.
Thank you all for participating! After cutting off the leaking heat exchange tube, referring to the tables on pages 4–7 of the \"Chemical Process Design Handbook,\" the design pressure for 19x2 tubes is less than or equal to 1.0 MPa. It was not clear whether the heat exchange tubes were designed based on differential pressure or pressure alone; as a precaution, compressed air at 0.6 MPa was used to test the shell side, and no leaks were detected. The situation is currently good. I hope everyone can give a clear answer as to whether the heat exchange tubes are designed using differential pressure or pressure design.
I guess it’s rare for designs to be based on pressure difference, right? The fact that it doesn’t leak at 6 kilograms of pressure doesn’t mean it won’t leak at 25 kilograms of pressure
It is best to consult the as-built drawings of the equipment; if the equipment is to be used again, the test pressure should be determined through calculations based on the actual measured wall thickness of the cylinder, and it must not exceed the test pressure specified in the as-built drawings. Since the leakage points are uncertain, both the tube side and shell side should be pressure-tested.