John Stumbles wrote:
On Tue, 05 Feb 2008 12:33:24 +0000, Tim Downie wrote:

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?

For pipework it's no observable drop, which IIRC is stated somewhere
to be less than 0.25mbar (over 2 minutes test).

Just tested the system "appliances isolated" and the good news is that
there's no drop. Still no drop with CH boiler connected. A small drop
(0.5mbar over 2 minutes) with the cooker & tumble dryer connected.

I rather suspect that these bayonet connections account for most of the
leak.

With that pressure drop (& no smell of gas) should I stop worrying?

Tim