Slow leak testing

[Rob White]

.

Also be aware that some leaks, leak more as the pipe expands or
contracts, when it heats up or cools down. Sometimes, some small
leaks only show when the system is running.

And as stated above by Sterl 150psi is only about 10 bar and R22 at
10 bar has a saturation temp of only about 26 degC, in the UK we work
to saturation temps of upto 55 DegC which gives working pressures of
21 bar ish (300 psi) and then we can go above that to prove the system.

If you can't find a leak at lower pressures you need to increase the pressure,
but only to the maximum your standards work to.

Rob

.

[redroge]

.

Also be aware that some leaks, leak more as the pipe expands or
contracts, when it heats up or cools down. Sometimes, some small
leaks only show when the system is running.

And as stated above by Sterl 150psi is only about 10 bar and R22 at
10 bar has a saturation temp of only about 26 degC, in the UK we work
to saturation temps of upto 55 DegC which gives working pressures of
21 bar ish (300 psi) and then we can go above that to prove the system.

If you can't find a leak at lower pressures you need to increase the pressure,
but only to the maximum your standards work to.

Rob

.

Had a small tosh. R410a unit with a very slow leak, twelve months before noticable lack of performance that only held 0.7kgs could never find a leak when pressure tested at 500 psi ,eventually found leak when running in cooling mode with soapy suds on outdoor suction flare a bubble every now and then.