Is it possible to perform helium testing on heat exchangers for leak detection without removing the head?

2020-07-13 View Original

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Question: Are there any standards or specifications that allow for helium testing of the welds on the heat exchanger tube sheet without removing the head, by using the nozzles to check for leaks in the welds between the tube sheet and the heat exchange tubes? Typically, according to standard NB/T47013.8, clause D5.4 requires that the distance between the suction nozzle and the surface to be inspected be kept within 3 mm; this constitutes fixed-point measurement. Is there a way to conduct only qualitative measurements?

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Is it possible to perform helium testing on heat exchangers for leak detection without removing the head?

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