We've just bought a flat that has a gas cooker and gas heaters (these
have not been used for 2 years).
I tried to light the cooker yesterday, the gas is turned on and is
making a noise from the one ring on the hob i tried, but this flow of
gas blows out anything I try to light it with (lighter, matches etc).
We plan to get the heaters checked out before use, but I assumed I
could light the cooker.
Could this be air in the pipes?
I only tried to light the cooker for about 2 minutes and I got a bit
paranoid that I'd blow myself and the neigbours up :)
The flat isn't in the UK so it won't be a CORGI engineer, but as I
mentioned I'll be getting an engineer to look at it (in the New Year).
Anyone know of a safe way to try to get the cooker lit?
The previous owner was at the place trying to light the heaters
yesterday, but I stopped her as something wasn't right and I don't want
to light the heaters until they have been checked out, but she was
furiously clicking away at the ignition switch of the heater, so I
turned off the gas.
The gas that was coming out of the cooker was extinguishing the flame
from the matches and lighter so I assumed there is air in the pipes
doing this, but I didn't want to leave the cooker on any longer until I
checked out exactly what to do.
What is the usual method used for clearing the pipes?
Turn on an appliance an let the gas force the air out...
When you turn a gas appliance on is there a smell of gas? Is there any
attempt at a flame post your ignition implement? Have you tried not having
your ignition implement not in direct line of the gas flow but slightly
below it? Have you tried lighting without the burning being full on?
As the pipes are remaining pressurised they must still be connected to a
supply of pressure. I find it highly unlikely that this is going to be
anything other than the gas supply. The pressure regulator might have
failed but I would half expect them to fail safe, ie off rather than let
the full supply pressure through. Is there a "hard" or "gentle" hiss when
you open a valve?
In an earlier contribution to this discussion,
You've obviously got air rather than gas coming out of the nozzle! You need
a decent flow of gas to clear the air out of the pipes. This may not be
possible with everything connected, because there is probably a flame
failure device in the cooker which only allows a trickle of gas until the
pilot is lit - so you have a vicious circle.
Gas off at the meter
Disconnect gas pipe where it enters cooker
Open doors and windows
Gas on at meter until gas rather than air comes out of the pipe
Gas off at meter
Reconnect pipe to cooker
Gas on at meter
Check with washing-up liquid that re-connected joint isn't leaking
Wait a few minutes for gas in room to disperse
Using common sense and plenty of ventilation, you're very unlikely to end up
with an explosive mixture of gas in the room. A professional would do
exactly what I've described above - there's no other way to purge the pipes
when a flame failure device is present.
If there *isn't* a flame failure device - i.e. if there's a good flow of
(air) from the hob rings, turn all rings full on for a couple of minutes -
or until you can smell neat gas coming out - with the doors and windows
open. Then allow time for the gas to disperse and have another go at
The use of washing-up liquid for gas soundness testing is very strongly
deprecated since the salt content can lead to corrosion, eventually
causing leakage. A proprietary gas leak detection spray (available from
Screwfix) should be used.
For reference the full formal gas purging procedure can be found here:
In message , Roger Mills
The definition of "unlikely" being?
I have a jar with 1000 jelly babies in it, 1 of them has cyanide in it.
Would you like a jelly baby from my jar?
You are unlikely to get the poisoned one.
The gas in the main pipe to the house has gone off and lost all its
flammability because it's been sitting in the pipe for 2 years. You'll have
to ask the engineer to rejuvinate the gas in the pipe under the street with
a FreshGas tablet otherwise it'll take hours to flush out all the expired
gas because the main pipe is very big, and that'll cost you a fortune.
That sounds interesting - is there some sort of cut-off device that shuts
off if the flow exceeds a certain volume?
This could be a life saver in areas where the theft of pipes is becoming
Our grill started playing up: on the low setting it lights and burns ok, if
I turn the gas up even slightly, or light it and leave it on full, there's a
bang that shakes the floors in the house and it blows itself out! Much fun
with just a tiny amount of gas. At first I thought it was the gammon steaks
I was cooking going pop until I realised that the 'pop' made the doors
We're not using it now :o)
I am just trying to work out what happened to all that natural fgas
under the North sea, that has been there for a few million years,.
Of course. The flammability has pooled at the bottom and soaked its way
to Saudi Arabia.
Its all so simple when you work it out!