Gas Pipe Size

[chrisinplymouth]

hi.... can anybody tell me how to tell if the pipe from regulator to gas distribution manifold is 8mm or 10mm. Mine is plastic coated copper.... do you measure the diameter including the cover, just the copper, or the internal diameter?

TIA

Chris

 

[Landy Andy]

Measure the copper externally. NOT including plastic

Mine was 10mm

 

[chrisinplymouth]

Thanks Andy

 

[Silver-Fox]

You could just cut a bit of the plastic of and measure the od. If it’s 10 mm then it’s 8 mm pipe.
Or just measure with plastic on if it’s 11 ish mm its 8mm pipe

 

[chrisinplymouth]

Cheers

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[Wagoneer]

You could just cut a bit of the plastic of and measure the od. If it’s 10 mm then it’s 8 mm pipe.
Or just measure with plastic on if it’s 11 ish mm its 8mm pipe

I always thought the size of the copper pipe was related to the outside diameter (without the plastic protection layer, if present).

The reason being, any couplings or olives are sized to fit the outside diameter of the pipe.

 

[TinaLes]

I thought the gas pipes on our Carthago were plastic coated copper pipe also. However closer inspection revealed they were steel pipes with a plastic coating. The end of the 3 way Truma gas manifold valve under the worktop supplying all the appliances had an end plug which I have used to feed a new external BBQ point. On removal of the end plug I discovered that the pipe outlet was 10 mm, not 8mm as I thought it would be. This led to me having to get hold of 10mm to 8mm reduction olive kits, when having fitted I was not happy with.
I then had to have a brass reducer pipe manufactured only 65mm long but going from 10mm to 8mm OD size.
Lesson learned, Truma make distribution manifold valves with 8 or 10mm outlets with the main feed being 12mm in some cases. Carthago fit the 10mm outlet size due to the pipe length to supply heavy usage items like boiler and FF.
Good luck with your install, I was pulling hair out with mine at the time as I could not get to the manifold to fully remove it and replace with a 4 way, which would have been the simplest method.
Les

 

[eddie]

hi.... can anybody tell me how to tell if the pipe from regulator to gas distribution manifold is 8mm or 10mm. Mine is plastic coated copper.... do you measure the diameter including the cover, just the copper, or the internal diameter?

TIA

Chris

What are you trying to do?

 

[chrisinplymouth]

What are you trying to do?

Order a basic spare regulator

 

[jockaneezer]

As an aside, "pipe" is generally measured and specc'd by it's outside diameter, whereas "tube" is usually specc'd by it's internal diameter or bore.

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[eddie]

Order a basic spare regulator

Ah Thought that you were cutting the pipe to add something, which I was going to advise you against lol

 

[Silver-Fox]

I always thought the size of the copper pipe was related to the outside diameter (without the plastic protection layer, if present).

The reason being, any couplings or olives are sized to fit the outside diameter of the pipe.

You are correct

Must of had brain fade earlier
Apologise for the misinformation.
I’m off to put the dunces hat on and stand in the corner

 

[Landy Andy]

To reduce size from 10mm to 8mm I would have just used a solder fitting. Solder fitting are available in all the above mentioned pipe sizes.

 

[tonyidle]

To reduce size from 10mm to 8mm I would have just used a solder fitting. Solder fitting are available in all the above mentioned pipe sizes.

Me too.

 

[chrisinplymouth]

Ah Thought that you were cutting the pipe to add something, which I was going to advise you against lol

@eddievanbitz No just a spare regulator this time, but in the future was going to get a bbq point fitted. Would this involve a manifold change then? Existing one is a 3 way with no spare outlet.

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[eddie]

@eddievanbitz No just a spare regulator this time, but in the future was going to get a bbq point fitted. Would this involve a manifold change then? Existing one is a 3 way with no spare outlet.

It would be easier and safer in my opinion to change for a four way manifold so you have safe and easy shut off for the BBQ point. Having said that I have given up fitting external BBQ points as I always find that they end up in the wrong place.

I use my BBQ under the awning sometimes, sometimes in the Sun, sometimes in the shade of a tree, sometimes carried around to my mates van, all over the place, determined by the weather, what I am cooking and the company. Gas pipes are only supposed to be 1m and even if you double or triple this, I found the BBQ always in the wrong place

So I am back to carrying a small lightweight bottle, so I can BBQ where I want not where I have to be!

 

[chrisinplymouth]

It would be easier and safer in my opinion to change for a four way manifold so you have safe and easy shut off for the BBQ point. Having said that I have given up fitting external BBQ points as I always find that they end up in the wrong place.

I use my BBQ under the awning sometimes, sometimes in the Sun, sometimes in the shade of a tree, sometimes carried around to my mates van, all over the place, determined by the weather, what I am cooking and the company. Gas pipes are only supposed to be 1m and even if you double or triple this, I found the BBQ always in the wrong place

So I am back to carrying a small lightweight bottle, so I can BBQ where I want not where I have to be!

Actually...... that’s a very good point.....

 

[Lunaman]



I have this regulator which has a 10 on it, so I thought it would be a 10mm one. Is this correct as the pipe seems to look more like 8mm.Thanks for any advice.

 

[Odd-no-more]

To reduce size from 10mm to 8mm I would have just used a solder fitting. Solder fitting are available in all the above mentioned pipe sizes.

Soldered fitting should not be used on vehicles the vibration can cause them to fail

 

[PeterCarole29]

Soldered fitting should not be used on vehicles the vibration can cause them to fail

I dont dispute that at all . i find that suprising compresion joints are considered better. Do you have any reference to that as i may have to change a joint

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[Odd-no-more]

Compression joint should only be used on accessable positions as they may come loose. I don't have any reference material regarding soldered joints to hand, I have been retired for a while now. I will see if I can find anything tomorrow.

 

[Basildog]



I have this regulator which has a 10 on it, so I thought it would be a 10mm one. Is this correct as the pipe seems to look more like 8mm.Thanks for any advice.

View attachment 779763

That’s the year of manufacture
So it’s now 13 years old and should have been replaced at 10 years maximum.
Basically it’s now scrap

 

[Basildog]

Compression joint should only be used on accessable positions as they may come loose. I don't have any reference material regarding soldered joints to hand, I have been retired for a while now. I will see if I can find anything tomorrow.

You can only hard solder on leisure vehicles so normal soft soldering is not acceptable, the problem is the vibration can cause the soft solder to migrate from the joints.

 

[Odd-no-more]

You can only hard solder on leisure vehicles so normal soft soldering is not acceptable, the problem is the vibration can cause the soft solder to migrate from the joints.

I remember something in the exams but as we never worked on motorhomes I forgot almost all of it until the next exam

 

[olley]

I silver soldered my pipework to the BB.

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[Lenny HB]

Soldered fitting should not be used on vehicles the vibration can cause them to fail

I dont dispute that at all . i find that suprising compresion joints are considered better. Do you have any reference to that as i may have to change a joint

You shouldn't use soldered joints on wiring in vehicles either.

 

[BouncyBoatFolk]

You are correct

Must of had brain fade earlier
Apologise for the misinformation.
I’m off to put the dunces hat on and stand in the corner

It happens, I know!!!
Mike.