What are the causes of expansion joint failure?
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What are the main reasons for the fracture in the expansion joint at the regenerator outlet? What should be noted during operation?
Uneven circumferential corrosion or manufacturing defects, misalignment during installation
If the cracking is mainly due to corrosion, it is because the wall temperature is too low. Use expansion joints with external insulation.
First, determine whether it is stress cracking or corrosion cracking; if so, it is a combination of the two. Factors such as the device itself, installation, sulfur content in the flue gas, and outer wall temperature need to be considered; the key is that determining the cause of cracking is a prerequisite for solving the problem. Relevant experience can be found on CNKI or in petrochemical industry journals.
Agree with what was said above; we should first find out the cause of the cracking – is it corrosion or stress? If you have already stopped, it’s actually quite easy to check. If it’s running, I believe there will be more than one expansion joint at the outlet; check similar locations to see if there are any issues. If it’s due to corrosion, there should at least be some thinning (if thickness can be measured). If it’s caused by stress or material problems, then the situation is even worse. Address the issue promptly if it exists; otherwise, just report that everything is fine! Perhaps there is a defect in the installation or in the material itself; that would be the best solution (in that case, other expansion joints can be trusted). If it’s caused by issues such as vibration, then find a way to address that problem! !
Breakage of expansion joints is rare. There are many reasons; improper installation, corrosion, severe impacts, and so on, are all possible causes.
The fracture of expansion joints is caused by both corrosion and erosion as well as stress.
Is it possible for uneven heating to cause deformation first and then cracking?
1. Uneven heating, 2. Corrosive erosion, 3. Improper installation
It’s mainly due to stress; I just heard that the expansion joints at Shandong Huifeng Petrochemical have cracked. It’s the issue with stress installation.
There are cracks in the expansion joint here, and water is seeping out; it’s likely caused by hydrogen sulfide corrosion