Expansion jointing of large double-sheet plate heat exchangers – first pressure test successful!
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The large-scale double-sheet stainless steel tube heat exchangers manufactured by our company utilize the expansion jointing technology provided by Shenghui Hydraulics; with a water pressure of 8 Mpa, the pressure test was passed on the first attempt. Manufacturers in China who need large double-shell and plate heat exchangers can communicate with each other. In the past, during the manufacturing of double-tube-sheet heat exchangers, leaks occurred after expansion, or the joints did not seal properly. This time, a professional technical company was hired to develop a customized expansion solution, and the results were excellent. I also learned a great deal about expanding double-tube-sheet heat exchangers, acquiring professional knowledge in areas such as tube insertion, positioning, tube expansion, and welding. The company is planning to manufacture several double-pipe-sheet heat exchangers made of duplex steel in the near future; we can discuss this further together later.
When manufacturing double-shell heat exchangers, does your company first expand-fit the inner shell or weld the outer shell first? What is the pressure testing sequence?
Of course, the inner tube sheet is expanded first; after it passes the pressing test, then the outer tube sheet is processed. Since you ask this question, it’s clear that your company has never done this before.
There are plenty of cases where things are done from the outside in first. If someone asks this question, there must be a reason for it
We have been manufacturing double-shell and plate heat exchangers for over 10 years; our clients are all from Sinopec and the oil industry, and they require the construction to be carried out first from the inside out, as this is also stipulated by the supervisors.
May I ask: Is there any difference between pressurizing the tube side and the shell side after the overall assembly is complete, and what you mentioned, which is to first expand the inner tube, verify that it meets the pressure requirements, and then install the outer tube sheet? Do I need to make tooling every time? Thank you