Double-tube plate heat exchanger
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Dear Puritans, once the inner tube sheet of a double-sheet plate heat exchanger has been expansion-welded, how can one accurately determine whether there are leaks or not? Thank you!
It’s possible to do it using hydraulic pressure or airtightness. The double-shell plate structure is mainly used because the media in the tube side and shell side cannot mix, so the inner shell plate can only expand under stress. If it’s convenient for you, seal the shell side hermetically, and then spray soapy water outside the inner tube sheet – this is the most straightforward method. . . 3-4 kilograms of airtightness is sufficient
Conduct hydrostatic or airtight testing on the shell side
If the size is small, air-tightness testing in the hanging water tank can detect leaks.
Conduct a gas-tightness test or leak test