Gas Cooker hose.

[derekgillard]

I have fitted a new flexible braided gas hose to the cooker on our Sadler 29.
I used new copper olives on the new pipe and it does not appear to leak; However being very paranoid with gas, can any one tell if I should have used PTFE on the threads or any type of sealant on the connections.

Thanks

Derek

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[VicMallows]

Definately no PTFE tape on compression fittings. Tape would only be used on a threaded pipe fitting, but then must be gas-grade PTFE, though I prefer the modern pipe sealants. Your could smear the pipe/olive with a suitable jointing compound if you really want, but should not be necessary. Be careful not to overtighten the compression nut. As long as you test with soapy water, or ideally with a pressure gauge (easilly home made with a bit of plastic tube) all should be fine.

Vic
(in view of the subject; no responsibility can be taken for above. Seek professional advice if you have any doubts or concerns).

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[poter]

I agree with Vic.......... but the end connecting to the cooker is usually a threaded nut onto male thread.... if your connection is the same then it is a parallel thread and should have joint sealant or a washer, you can get from good plumbers merchants. BUT do check that the sealant is for gas. Vic is correct with regard to PTFE in that the tape for gas is not your ordinary tape available from DIY stores, but is single wrap PTFE tape.

You should always check ALL installations for leaks (especially enlosed LPG installations), with a U tube Gas test Guage.
Maybe your local corgi engineer can help.

Its advisable to fit a gas cock local to the cooker, again a 1/4 turn gas valve (valve with yellow handle) would be available from your local plumbers merchant.


poter.

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[mhouse]

There is a thread sealant called calortite , i got mine from a caravan shop.

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[Cloven]

Can I also suggest fitting a bubble leak gas detector. This is not too expensive and will tell you at a moment's notice if there are any leaks in the system.

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[Cloven]

Can I also suggest fitting a bubble leak gas detector. This is not too expensive and will tell you at a moment's notice if there are any leaks in the system. Full details in back issues of PBO.

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[l'escargot]

Guidance <A target="_blank" HREF=http://www.calormarineshop.co.uk/installation/hoses_pipework_joints.htm>here</A>

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[muchy_]

Gas PTFE is fine, although I only use bosswhite jointing compound. You are not supposed to use washing up liquid to test joints because it contains salt which as we all know is corrosive. However, this is a fairly new regulation and we have been using washing up liquid for years and nothings ever blown up because of it as far as I am aware. Just use a smear of jointing compound on all joints and just nip compression joints up until tight. DO NOT OVER TIGHTEN THEM, this is where most people go wrong. Just nip it up and test for leaks with a proper leak detecting fluid. If it leaks just nip it a little more, repeat until the joint is sound. There should be a test point somewhere, connect a u gauge to this and make sure there is no drop in pressure over a period of time.

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[chriscallender]

I would go a bit further than saying its not necessary - any compression joint that is depending on a jointing compound or PTFE is a badly made joint - they are designed to seal by the olive alone making metal to metal contact.

If you need sealant you did something wrong - and far better to find that out at first test than have the fault covered up for a while by the sealant only to start leaking when you don't expect it.

So the original poster did exactly the right thing by not using any PTFE or sealants and shouldn't worry! If he had used some kind of sealant I would recommend to him that he remade the joints.



Chris


PS This advice is my opinion and worth exactly the amount I was paid for it... I'm no way a gas fitter but I've made a few compression joints in my time on water pipes (and maybe gas!)

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[GARYOFFSHORE]

I don't mean to offend but as qualified marine gas installer I am very concerned that you are taking this job on yourself. The gas on boats is highly dangerous as you should know!! In household installations when the monometer test is done there are acceptable levels of leakage but on a boat there is none!!! Soapy water is not an option!!
Please do consult a professional at least to test your work.

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