ᐅ Water Pipe Leak Test – How Long Should Pressure Be Maintained?

Hello,

Yesterday, our plumber seems to have completed the rough-in installation. There is a pressure gauge installed at the washing machine connection that showed 2.9 bar (42 psi) last night. Today it was only 2.6 bar (38 psi). The pipes are Mepla tubing. I assume he performed a pressure test using compressed air. Is it normal for the pressure not to hold for that long?

But the pressure must still hold for one or two weeks afterward. We tested with five bar, and it remained stable from the time the pipes were installed until after the screed was poured and the plumber came back... Definitely keep an eye on it...