How can pressure testing be used to locate the leak?
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One of the heat exchangers in our hydrogen peroxide processing unit is leaking, but no leak could be found despite attempts to locate it during shutdowns. The leakage reappeared once the unit was put back into operation. Does anyone know how to identify the source of the leak? (The working fluid has a quite strong ability to penetrate.)
I’ve tried using both water and air, but it still can’t be found; leaks will reappear soon after it’s integrated into the system.
Gases should be used, as gas molecules are small. The gas pressure can be increased and maintained for a while, or helium with smaller molecules can be tried. I wonder what the operating conditions are under your setup? It is possible to simulate the operating conditions, such as the temperature under those conditions. Small leaks of gas may be difficult to observe; using soapy water is a simple, inexpensive method that makes it easier to detect them. A leak detector can also be used; it detects the location of leaks by taking advantage of the specific noise frequency that occurs when gas leaks.
There is a leak in the tubes; there are over 1,100 tubes in total.
Try helium testing or ammonia testing; they have high sensitivity and work quite well
Same as 6L; I just saw the standards for helium testing today!