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In article .com,
"Aidan" says...

Ed Sirett wrote:
I reckon testing it dry using about 0.5-1.0 bar this will show up major
faults

Pressure testing with air is inherently dangerous. The BSI's panel of
experts who compiled the BS on pressure testing recommended against it.
Lots of people do it as routine, usually those who haven't seen a
failure under air pressure.

There was some programme in which a bunch of trainees had to build a
flat in a development. They got an 'expert plumber' in who tested their
non-expert plumbing by connecting his 50 psi B&Q compressor to it and
switching on. There were lots of leaks.

listening and by using gas leak detector.

Eh? Gas detectors use sniffer type things, don't they. Do you have an
ultra- sonic one (who from), or are you thinking in terms of gas pipes?

It's a spray-on foam that makes leaks easy to see.