Discussion on ammonia leak testing for heat exchangers
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Regarding the three testing methods mentioned in HG/T20584-2011, if the third method is used for testing, the document only specifies that the test pressure should be 1.05 times the design pressure; so, does this design pressure refer to the shell side or the tube side?
It should be the side with higher pressure that is followed
An ammonia leakage test is conducted on the shell side, with the test pressure being 1.05 times the design pressure of the shell side; of course, it’s the shell side that is under test.
Since it is about detecting leakage points, this area is subject to two types of pressure. Naturally, it is necessary to consider the performance under severe conditions; therefore, the pressure on the highest side should still be chosen； If one side is under negative pressure, then the test pressure should be the effective sum of the pressures on both sides