Leak on gas valve

[gregg1908]

Hi

Could anyone offer advice in relation to a recent call out i have recieved.

I gas tightness tested a clients system and detected a leak,after further investigation i singled out the boiler,
i tested the gas valves connections both inlet and outlet and they are gas tight leading me to think the valve is letting by.
Could anyone offer advice as to how to check the valve for gas tightness please.

 

[diamondgas]

'U' gauge on p1 turn iso to valve off and see if pressure drops gregg1908

 

[gregg1908]

Thanks for replying so quick i will test the way you suggested.

 

[diamondgas]

Thanks for replying so quick i will test the way you suggested.

You're welcome

 

[Mike Jackson]

Wasn't a glow worm ultimate ff was it? The gas valves on the earlier models were prone to letting by to the pilot.

 

[gregg1908]

A vokera linea plus

 

[GQuigley67]

what type of meter was it ?

if you have traced the leak to the boiler and it is less than say 4mbar over 2 mins on a U6 meter for example then its fine to leave.

 

[Backboiler]

Its not ok now he's identified the leak

 

[SafeGasInstall]

u sure u was not permanent light on

 

[GQuigley67]

but its not leaking into the room the gas valve is passing by which is why i thought we are allowed the drops in the first place, otherwise whats the point in it ? as it would be 4mbar on pipework and we know were not allowed that on pipework

 

[SafeGasInstall]

to me you are not cool to leave as gas valve must not pass gas as this could create a massive build of gas in boiler and BOOOOOOOOOOM

 

[Backboiler]

This has cropped up before and I was heavily involved in the thread. You are ok to leave a 4mbar or 8mbar (as the case may be) as long as you don't investigate the drop and furthermore identify it to a specific point. If Gregg has identified that the gas valve is passing it is ID

 

[gregg1908]

Thanks Backboiler allways best to be safe a leak is a leak and the valve will be replaced.

 

[gregg1908]

Should the permanent light once the gas supply is cut off close the valve ?

 

[gregg1908]

u sure u was not permanent light on

Should the permanent light once the gas supply is cut off close the valve ?

 

[SafeGasInstall]

no , it will keep go as there is lots of gas in the pipe to be on

 

[Backboiler]

Gregg. Cheers..... Nice web site. I'll be coming up your area in July to the Open. I'll shout to you across the Irish sea

 

[Pssst]

If the leak stops when the boiler isolation valve is shut then its clearly on the boiler. I'd whip the case off and check pilot light and main burner injectors/internal bits with a gas detector. I wouldnt leave a leak which is occuring into a boiler case due to the danger of explosion when the boiler fires up. This used to happen occasionally on for eg potterton netaheat 10/16s with white /rodgers valves which passed gas into boiler casing and went kaboom when fired. Seen a few U shaped cases.

 

[GQuigley67]

that's where the regs are not very clear, if you isolate boiler and test passes then its OK to leave

 

[SafeGasInstall]

yes if you isolate boiler you can leave Gas on so customer can cook or use fire , but not the boiler !

 

[GQuigley67]

so if its within the 4mb tolerance which GSR say is acceptable to leave as long as it is not on pipework, it says no where that you should decommision the appliance

 

[SafeGasInstall]

you can not leave a appliance on if the gas valve is leaking mate , it is a ID ....

remember main safety device is not working gas is leaking

 

[GQuigley67]

im talking about isolating a boiler not the gas valve, its deemed to be OK to leave

 

[bennygas]

I can see this getting to be a right can of worms...

 

[GQuigley67]

lol true, i dont leave any leaks at all but i dont understand how you can isolate boiler and if it passes and within tolerances its ok to leave, if you decided to investigate further it may well be an ID situation but your allowed to turn a blind eye to it ?