When the plate heat exchanger is used for a certain number of years, the problem of heat exchange efficiency or leakage will occur. Internal leakage is a relatively common problem in plate bai heat exchangers. If two media are in series with each other, 99% of them may be caused by plate perforations. How to detect and determine whether the plate heat exchanger is leaking?
(1) Method of water leak test for heat exchanger
The water leak test is to inject water into the heat exchanger, and then press the water in the plate heat exchanger with a water pump to make it reach a certain pressure to check the heat exchanger for leaks. If there is no external leakage, but the pressure keeps dropping, then it can be judged that the internal leakage of the plate exchange has occurred. In the case of external leakage, the pressure and drainage shall be released after the mark is made after the leak detection. Please take out the leaked plates and check whether the gasket is deformed, displaced, or the plates are perforated or deformed
(2) Air pressure leak test method for plate heat exchanger
The plate is immersed in the water so that the air is pressed into the plate heat exchanger through the hose, and it is observed whether there is any air bubbles escaping from the heat exchanger. The air pressure in the heat exchanger should be l-2atm (1atm=101325Pa), and the time should be no less than 1min. After checking one side, turn the heat exchanger over and check the other side. After the heat exchanger leaks, use nitrogen for pressure charging and leak testing.