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I am doing hydro test in normal galvanized pipe. During hydro test the ambient temperature is 43 degree Celsius. Test pressure is 24 bar and holding time is 1 hour. The problem is when I set pressure in 24 bar after 1 hour of holding time it became 26.5 bar. Pressure increased 2.5 bar. Is there any scientific reason behind increasing 2.5 bar?
24/04/2019 A: Eric Vetters, ProCorr Consulting Services, ewvetters@yahoo.com
Ambient temperature is higher than the starting temperature of the hydro test water so the water undergoes thermal expansion. It has nowhere to expand so as it tries to expand it exerts more pressure on the pipe.