Gas Leak

[Galena]

So I lost a full bottle of CO2 left turned on and connected to 3 cornies.
I regularly check for leaks by spraying with Starsan to all John Guest fittings, connections, cornie seals, regulator connections etc and have never seen so much as a bubble, and yet leak it did.

So with a new full bottle I am too paranoid to leave it tuned on and am wondering if I have a leak by the issue in the attached picture.

The two regulated valves stay constant, maybe drop a little on a newly kegged beer as I would expect, it is the bottle pressure valve that drops down to zero everytimes.
Occasionally within a short time, occasionally a few hours but drop it does.

My question is, what part of the system might the leak be if only the main cylinder gauge is dropping?

 

[Larse]

Trial and error might be the best way forward. Start disconnecting things. I'd start with the second regulator. Turn that off and if no change, then by elimination it must be the first one. Also check all the regulator fittings including the bottle connection and especially the nylon washer. They're supposed to be changed every time the bottle is replaced (I doubt anyone does this, but maybe every few months).

 

[Galena]

Trial and error might be the best way forward. Start disconnecting things. I'd start with the second regulator. Turn that off and if no change, then by elimination it must be the first one. Also check all the regulator fittings including the bottle connection and especially the nylon washer. They're supposed to be changed every time the bottle is replaced (I doubt anyone does this, but maybe every few months).

Thanks, logical idea I'll start with that.

 

[Larse]

Just to answer your question as I hadn't noticed it earlier. The regulated pressure will stay the same until the bottle is empty. If there's a leak anywhere, this won't change as the regulator will keep feeding pressure to the set amount into the lines whether it's leaking or not. So the main pressure will drop because the bottle is being emptied as the regulator(s) try to keep up with demand from the (leaking) system.

 

[Galena]

Just to answer your question as I hadn't noticed it earlier. The regulated pressure will stay the same until the bottle is empty. If there's a leak anywhere, this won't change as the regulator will keep feeding pressure to the set amount into the lines whether it's leaking or not. So the main pressure will drop because the bottle is being emptied as the regulator(s) try to keep up with demand from the (leaking) system.

But if the cylinder valve is closed and the gauge drops to empty, but the 2 regulator valves still show pressure?

 

[Larse]

But if the cylinder valve is closed and the gauge drops to empty, but the 2 regulator valves still show pressure?

There will still be pressure in the system. The pressure in the kegs will be pushing back on the regulator.