How many times should a hydraulic pressure test be conducted on the heat exchanger during maintenance?
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What potential safety hazards arise from using only pipe management?
Twice, usually once on the cooling medium side and once on the side being cooled
1# liww8086, twice – you must be referring to a shell-and-tube heat exchanger; both the shell side and the tube side need to be pressurized tested
First, test the shell side, then the tube side. When testing the shell side, it is also necessary to check the welds between the heat exchange tubes and the tube sheet; when only the tube side is pressurized with water, it becomes more difficult to inspect the welds between the heat exchange tubes and the tube sheet
Only the tube side should be tested; it’s not possible to inspect the welds at the tube ends, so it’s best to conduct a hydrostatic test on the shell side