Are there any guidelines for leak testing of heat exchangers? This is not for code strength repairs, but more for product contamination. I believe that they should be tested at some factor of operating pressure, but less than MAWP or design pressure. We have found that 1.1 or 1.5 time design pressure is excessive for the intended purpose. In addition, are air-cooled exchangers treated differently? Could the test be performed with nitrogen instead of water?
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