"dennis@home" wrote in message
...


"Tim Downie" wrote in message
...
I was recently told when a plumber cut off a dead leg in our gas pipework
that we had a small (but allowable) leak in our system.

Clearly he wasn't wild about chasing the leak but I'd rather there wasn't
one. Before I start hunting, what's the acceptable leak level in
mbar/min?

Zero!

No such thing as zero. That would mean waiting infinitely long to prove
that there was no leak.

Unless you know the gas is being vented to the outside air how do you know
it will not go *BANG*?

Funnily enough, I have a nose. It's proved a lot more reliable than BG gas
fitter's testing proceedures.

It may take weeks or months to build to an explosive mixture but how do
you know it hasn't?

If we were talking about LPG, I would worry more but natural gas has a lower
density than air, so it's less inclined to lurk.

Tim