Hi! I'm currently conducting a hydrostatic pressure test for hot water piping which consisted of a return and a supply line. The covered areas for the tested pipe is from Level 1 to Level 3. For this leak test, cold water is used as its fluid. Attached below is the basic pipe network of our building to give you the idea. At water pumping point is at 175 psi (Gauge No 1)while Gauge No. 2 at the end of Level 1 is at 170 psi. At Level 2 Gauge No.3 is at 145 psi and the Gauge No. 4 at Level 3 is at 140 psi. The specification stated that it should be tested at 175 psi. All 4 gauges have been calibrated. My question is, are there any explanation of whats going on here? I'm expecting the whole pipe network to be at 175 psi. Is it acceptable? If yes, whats the basis of accepting this test? Lastly, is there any formulae of calculating allowable leakage for pressure test with duration of 24 hours?
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