How to choose the method for conducting a leak test on containers?
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In accordance with the requirements of Article 11.3 of HG/T20584-2011, a leakage test shall be conducted if necessary. Leakage tests include airtightness tests and ammonia leak detection, among others. For the airtightness test, the test pressure is required to be the design pressure. Sometimes, the design pressure of containers is high, making it difficult to conduct airtightness tests; moreover, when ammonia is used for leak detection, it is hard to inspect the sealing surfaces. How do I choose a specific testing method?
In our company, ammonia leak testing is generally carried out when the test pressure in the tube side of the heat exchanger is higher than that in the shell side. You can also use blind plates to cover the flanges, then wrap a piece of white paper soaked in phenolphthalein around the outside of the welds; if the color changes, it indicates a leak.
Similarly, white paper can also be wrapped around the outside of the flange
Pressure-based airtightness testing is indeed quite dangerous to carry out; methods A and B for ammonia leakage testing can be considered.