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 Post subject: LPG leak
PostPosted: Mon Jun 15, 2015 4:52 pm 
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Joined: Wed Jun 16, 2010 5:45 pm
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Hi, I need advise ASAP. I was changing the gas filter and expected the system to vent the gas from the pipes when I undid the filter housing but the pressure release was much more than I expected and didn't stop. After a few minutes I retightened the housing but gas is still dripping from the filter housing nut and the housing itself has gone completely white with frost. I thought the tank solenoid was supposed to shut when the system was off but maybe it's faulty? Is there anything I can do apart from watching it drip and hoping it doesn't explode because the tank's full?

Any suggestions please.


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 Post subject: Re: LPG leak
PostPosted: Mon Jun 15, 2015 7:11 pm 
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It certainly does sound like your tank solenoid valve isn't working or someone has removed the plunger after having a problem in the past. There should also be manual shut off on the multivalve if you can get to it (I know what installs on an RRC can be like!).

It will vent for quite a while though. 1 litre of liquid becomes 270 litres of vapour so does vent for longer than you expect. They also go with quite a bang when you slacken the filter off too, the usual way is to slacken off the inlet pipe and let it vent from there before opening the filter housing. As long as the car is outside, the wind should disperse it, just be careful of any drains as Propane, being heavier than air, will pool in there.

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 Post subject: Re: LPG leak
PostPosted: Tue Jun 16, 2015 12:28 pm 
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Cheers for the reply Gilbert, my tanks are underneath so getting anywhere near the multivalves or solenoids is a nightmare but I eventually managed to get my hand wedged between tank and floor so I could tap on the solenoid with a bit of wood. Seemed to do the trick as it stopped dripping about 10 mins later (either that or the tank's empty).

Based on this experience I'd like to fit a manual shut-off valve in-line before the filter housing but I can't find one with the right size fittings (I'm pretty sure my pipes are 6mm) any sugestions?


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 Post subject: Re: LPG leak
PostPosted: Tue Jun 16, 2015 12:38 pm 
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That wouldn't offer the protection of properly working tank valves e.g. against pipework damage. I would advise biting the bullet and sorting them out.

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 Post subject: Re: LPG leak
PostPosted: Thu Jun 18, 2015 3:59 pm 
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Joined: Wed Jun 16, 2010 5:45 pm
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I agree completely rossko, I wasn't thinking of replacing the solenoids with a manual valve but adding the valve as well. It would be a back-up bacause the tank solenoids are impossible to get to, if there's a problem, without dropping the tanks.


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 Post subject: Re: LPG leak
PostPosted: Thu Jun 18, 2015 5:35 pm 
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The thing about fitting any shut-off valve in line (in case something goes wrong with a valve further downstream closer to the reducer), is that if something then goes wrong with the newer valve you're back to square one.. would still have gas leaking out the tank while trying to repair the more recently fitted shut-off valve. As others have said, from a safety and fail safe point of view you're better off fixing the tank valve. But an inline shutoff valve before your liquid phase filter should at least allow you to change the filter in future without losing all the gas in the tank - wouldn't need to be manual, you could fit an inline 6mm solenoid, or a filter solenoid (you might even remove the filter element).

Simon

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