Surrey Dave
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| posted on 18/5/07 at 06:55 PM |
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Gas connection Solder or Compression?
If I where to fit a copper 22mm pipe onto my old gas barrel pipe , (which I wouldn't 'cos it's illegal).
Does it have to be soldered at the 1st joint , I have an adaptor that screws onto the old pipe and has acompression fitting for the new copper?
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JoelP
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| posted on 18/5/07 at 06:57 PM |
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compression fittings on gas pipes must be accessible. Threaded fittings need gas paste on both sides. Do you know how to pressure test the system?
Worth buying a U tube if you do intend to fiddle with it.
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coozer
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| posted on 18/5/07 at 07:02 PM |
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Solder, then a pressure/leak test.
1972 V8 Jago
1980 Z750
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Chippy
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| posted on 18/5/07 at 07:09 PM |
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Soldered fitting on gas are NOT acceptable, all fittings MUST be compression. I think that it has something to do with the natural gas having a
detrimental effect on solder, (in other words they leak). As far as I am aware, (may be wrong), but you are perfectly legal in carrying out work on
your own gas instalation, but would recommend that you have a CORGY reg'd fitter check it afterwards. This is how it used to be, may have
changed since I was involved with it, but somebody will come along soon and give the word according to the present law.  Ray
To make a car go faster, just add lightness. Colin Chapman - OR - fit a bigger engine. Chippy
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JoelP
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| posted on 18/5/07 at 07:19 PM |
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not so mate, solder is fine. Just be sure, if soldering, to use a flux that isnt acid based, since unlike water pipes it will never be washed out. 
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owelly
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| posted on 18/5/07 at 07:20 PM |
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Oh dear! I have installed tons of gas gear with soldered copper.........
As previous, all comp fitting must not be hidden or buried. Soldered are fine as far as I'm concerned.
http://www.ppcmag.co.uk
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Chippy
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| posted on 18/5/07 at 07:27 PM |
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OK so I'm wrong, but thats what it used to be, but haven't been involved with gas fitting for, Erm! zzzzzz years.  Ray
To make a car go faster, just add lightness. Colin Chapman - OR - fit a bigger engine. Chippy
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Surrey Dave
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| posted on 18/5/07 at 07:33 PM |
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CORGI
Yes I will have it checked by a CORGI person
Are we saying I can use compression fittings all the way on the gas , as long as I use the correct gas fitting paste ?
What is the paste called?
As I understand it there is a permitted amount of pressure drop from the meter to the appliance , what is it and how do I measure it with a u tube.
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JoelP
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| posted on 18/5/07 at 07:44 PM |
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you dont have to worry about pressure drop in my limited experience, so long as you pick the right size pipe and the length isnt excessive. Gas paste
isnt needed on compression fittings, i meant literal threaded fittings like onto a hob etc.
what are you fitting? Pick either 22mm for a boiler or 15mm for most other things and you will *probably* be ok on pressure.
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millenniumtree
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| posted on 18/5/07 at 07:56 PM |
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Ok, so I read this whole thread and when I got to the last post, I sat there for a second and then thought to myself...
"You stupid yank, GAS means NATURAL GAS".
You'd be talking about petrol otherwise... Durrrr...
In the states, as far as I know, you can NOT use soldered connections in a gas line. Must be threaded black steel or compression fittings.
When your house starts on fire and the solder melts... Big boom.
We had a small leak in our gas line when we bought the house - they bodge fixed it with JB Weld or similar. Then I put some plastic pipe hangers on
the 5m of pipe in the basement that was totally unsupported...
Did I mention the previous owners were clueless?? They lived there 30 years and didn't get around to fixing the most basic, and most dangerous
things.
Sewer gas in the basement, open electrical boxes with guts hanging out, unsupported leaky gas lines, main water supply literally spraying all over the
wall... Basement nightmare!!
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flak monkey
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| posted on 18/5/07 at 09:17 PM |
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Soldered gas fittings are fine as Joel says. The gas main into our house is all soldered and was installed to Corgi standards *cough*.
Our gas fire and hob are run off 15mm pipes, the boiler has a 22mm one IIRC. It was 10 years or so ago they were fitted.
David
Sera
http://www.motosera.com
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Deckman001
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| posted on 18/5/07 at 10:26 PM |
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Dave, give Paul (gasgasgas) a u2u about it, he's a free agent now so can do any testing you need done, he's fully corgi'd, but is on
Hols as of this weekend for two weeks
Jason
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MkIndy7
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| posted on 18/5/07 at 11:41 PM |
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quote:
Originally posted by Surrey Dave
Are we saying I can use compression fittings all the way on the gas , as long as I use the correct gas fitting paste ?
What is the paste called?
As I understand it there is a permitted amount of pressure drop from the meter to the appliance , what is it and how do I measure it with a u tube.
Either compression or solider fitting are fine provided compression are exposed and vented or the Flux is cleaned off afterwards if soldiered (massive
problem on new build properties!).
The Paste is called Gas Paste.. or any that says it is suitable for use on Natural Gas on the Label (presuming it isin't LPG)
The permitted pressure drop is 1mbar, it must be atleast 21mbar running pressure when tested at the meter with the U Guage on the test nipple and
atleast 20mbar WITH the appliance running when tested at the inlet (test Nipple) of the appliance (usually its own gas valve).
Hope that helps, ( I am CORGI registered not just guessing!)
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Surrey Dave
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| posted on 19/5/07 at 12:20 AM |
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thanks
Thanks for the info.
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