Cracks in the heat exchange tubes of coiled tube heat exchangers
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The heat exchange tubes of a coiled tube heat exchanger have cracked; are there any experts in this field? Help analyze the reasons together
What are the materials for the tube side and shell side of the heat exchanger? What are the design pressure, temperature, and the types of media generally used in the tube side and shell side? Is there a possibility of intergranular corrosion caused by chloride ions? Check whether the cracks are mainly in the straight pipe section; are there any cracks in the coiled pipe section? What is the temperature difference during operation in the shell and tube sides of a heat exchanger? Should a metallographic analysis be done if possible?
The cracks are mainly found in the straight pipe sections; it is necessary to investigate the reasons from a process perspective to determine whether severe fluctuations in pressure or temperature during operation caused the cracking. :lol
Because the possibility caused by scaling is very high. It is caused by local temperature changes; I’m not sure about the temperatures of the fluids in the tube side and the shell side.
Material, medium, operating conditions?
Study*study*, whose coil is this?
Judging from the shape and location of the crack, it appears to be a fatigue crack; were there any severe temperature fluctuations during the production process? More actual operation data is needed to determine the specific reasons.
We are a manufacturing factory, but we didn’t produce this winding tube; someone else came to us for help in fixing it
Tearing is unlikely, as the coiled tube functions like a spring itself
Preliminary judgment: Damage occurred during the manufacturing of the straight pipe section; vibration-induced damage may be present here