Reduce the water pressure in the heat exchanger
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The plant is testing the shell-side water pressure of the heat exchange tubes; the pressure is 3.13 MPa. After maintaining this pressure for half an hour, it drops to around 3.06 MPa. The volume of the shell side is 0.25 m3. I tried two units and both behaved in a similar manner; there was no sign of leakage on the surface. I would like to ask the experienced technicians: could it be that my pressure retention device is faulty, or is there actually a leak?
Check whether the pressure testing pump is returning water, and consider whether the equipment is filled with water (whether there is any gas present) With such a small volume, even a small leak will cause a drop in pressure.
It is possible that there is air inside; when compressed, the temperature of the air rises, and when the pressure is held constant, the temperature drops, causing the pressure to fall as well. Also, the check valve is leaking.
Open the shell-side vent plug to vent air when water is introduced； Pressure drop may also be caused by a leak in the pipeline from the booster pump to the heat exchanger.
The plant is testing the shell-side water pressure of the heat exchange tubes; the pressure is 3.13 MPa. After maintaining this pressure for half an hour, it drops to around 3.06 MPa. The volume of the shell side is 0.25 m3. === It could also be due to the influence of ambient temperature: if the temperature of the water used for the pressure test is higher than that of the surrounding environment, this phenomenon will occur.