I would like to ask the experts: after repairing the liquefied gas-seawater heat exchanger, is it okay to test the pressure on the seawater side using liquefied gas?
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I’d like to ask the experts here. LPG has a high coefficient of expansion, so leaks can be seen with the naked eye; however, when testing with demineralized water, it is difficult to detect even tiny leak points. But isn’t it dangerous to use liquefied gas for pressure testing?
Generally, water is used for pressure testing, right? They don’t use liquefied gas for pressure testing directly, do they?
Our plant director said that liquefied gas should be used to pressure-test the seawater lines, adding that this has been the standard practice in the past; he also rejected the idea of using the readily available demineralized water lines nearby for testing. He said that the expansion coefficient of liquefied gas can reach 1000, and any leaks can be seen very clearly.