vinny1275
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| posted on 7/4/10 at 11:36 AM |
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OT: Cooker gas fixings
Hi all,
I'm stripping out my old kitchen atm, getting ready to fit the new one, and I've pulled the old cooker out to have a look - the hose seems
to be threaded at the cooker end, and a bayonet at the other. The threaded end has been sealed with some kind of gunk - it hasn't set rock hard,
even tho the cooker has been in ages.
As a hypothetical question, as of course gas fittings should be changed by a gas safe engineer, are these bayonets self sealing at the wall - so, with
the hose removed, can I turn the mains back on and have the heating on? If I were to put in a new hose when I come to fit the new hob, would I need to
use that gunk on the threaded end, and if so, any ideas what it would be?
Thanks all,
Vince
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UncleFista
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| posted on 7/4/10 at 11:42 AM |
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You don't need to ask hypothetical questions, you only have to be gas-safe if you're doing it for reward.
If it's on your own property you only need to be "competent"[1]
[1] Obviously if the street dissapears in a big blue explosion one night it's going to be difficult to argue you're competent 
[Edited on 7/4/10 by UncleFista]
Tony Bond / UncleFista
Love is like a snowmobile, speeding across the frozen tundra.
Which suddenly flips, pinning you underneath.
At night the ice-weasels come...
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craig_007
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| posted on 7/4/10 at 11:48 AM |
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If your fitting a gas hob it needs to be hard piped with a gas cock before it connects to the hob.
If your fitting a free standing cooker buy a new cooker hose a roll of PTFE gas tape and wrap that around the male end of the hose and screw that into
the cooker,Also if it's a free standing cooker I would be inclined to fit a safety bracket/chain.
Regarding the bayonet fitting,I have seen them pass in the past,I would remove it and fit a blank end.
Any questions just fire away mate.
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m8kwr
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| posted on 7/4/10 at 11:52 AM |
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I fitted my own gas cooker....
My fitting at the wall was self sealing
I got a similar product to this,
Link
I was told you can use PFTE tape on the threaded end, but when I had to get another threaded bit to make the something a bit longer, I was told to use
this compound, that I can not remember the name of, but stinks.... there is other stuff you can get.
To be honest, a real easy job; glad i never got a pro to do it.....
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vinny1275
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| posted on 7/4/10 at 11:59 AM |
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Thanks for the replies chaps - special thanks to UncleFista for making me grin like a loon.. 
Craig, you've got a u2u 
Cheers,
Vince
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v8kid
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| posted on 7/4/10 at 12:32 PM |
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I had the devil of a job tracing a leak after I fitted a gas fire in my hall. Natrually I assumed that the leak was in the section I had fitted and as
the pressure drop was very slow assumed it to be a dry joint.
To cut a far too long story short I eventually traced the leak to the cooker circuit and in particular to the bayonette fitting which had a hardened O
ring. One O ring later and there was still a pressure drop allbeit a slower one!!
Got it first time it was the tapered BSP fitting from the flex into the cooker which was sealed with ordinary PTFE not the required one wrap. It did
not show up on the tracer fluid first time so it must have been disturbed. Easily sorted but I'm ashamed to admit it took me 3 hours to find all
the faults.
As a matter of interest I remade all the connections on the existing installation after this as I had little confidence in whoever fitted them.
Don't have much faith in bayonette fittings now either! I'd look at alternatives if I was rteplacing the installation, possibly a gas
stopcock with tapered BSP fittings either side of the flexible section.
Cheers
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JoelP
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| posted on 7/4/10 at 08:03 PM |
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a bayonet is fine left open in the short term, though it should be remembered that they do occationally not seal completely, and more likely if they
point upwards. In the long term if no cooker is fitted then it should be capped.
You can use gas paste or gas PTFE. I would use paste myself, but the gasman i use weekly uses the tape. Personal preference i suppose.
You can get a pressure tester for about a tenner, just a U tube full of water.
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