Construction sequence for leakage test and purging
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For industrial pipes that require a leak test, should they be purged first or have the leak test performed first? I see that some construction plans follow the sequence of [pressure test → leak test → purging]. If this sequence is followed, the leak test is carried out first (with all components in place), and purging takes place later; during purging, it is necessary to remove and replace instruments, valves, etc. (by installing splices), and these components are reinstalled after purging is complete. According to this approach, it is not economical for two reasons: first, components have to be removed and replaced, and second, the leakage can only be checked again during commissioning of the system. The ideal sequence is: [pressure test → purging → leak test conducted during combined commissioning]
The correct sequence of construction should be: first conduct a pressure test, then carry out purging, and finally perform a leak test in conjunction with the commissioning. Components need to be removed and replaced during purging, which affects the results of the leak test. Therefore, after the purging is completed, these components must be reinstalled, and then a leak test of the pipelines should be carried out in conjunction with testing to ensure the accuracy and completeness of the checks. This is indeed a relatively ideal sequence, as well as an economically sensible way of carrying out the work. .