Gas pipe size?

[Stemar]

I have a bit of work to do on Jissel's gas installation. I'm entirely comfortable with making compression joints, etc for a safe installation, but I'm not familiar with pipe sizes.

The current pipe is 6.5mm OD. Can anyone tell me what nomial size that is for ordering bits & bobs, please?

 

[VicS]

I have a bit of work to do on Jissel's gas installation. I'm entirely comfortable with making compression joints, etc for a safe installation, but I'm not familiar with pipe sizes.

The current pipe is 6.5mm OD. Can anyone tell me what nomial size that is for ordering bits & bobs, please?

Are you talking about the copper tube.. If so its more likely to be 1/4" !

Metric is whole numbers of mm ie 4, 5, 6, 8 or 10 mm

Imperial sizes are 1/4, 5/16, 3/8 and 1/2"

I suggest BES for mail order fittings and tube etc. http://www.bes.co.uk/index.asp

 

[Spirit of Glenans]

There was a thread started on 16 Dec regarding dimension of pipe and tube in which David 2452 contributed the fact that tube was described by its OD and pipe by its ID.

 

[Stemar]

Thanks Vic.

That's what I thought, so I was a bit confused by my measurement!

According to this http://www.engineeringtoolbox.com/astm-copper-tubes-d_779.html, 1/4" pipe is 3/8" OD, which would be 9.5mm or thereabouts.

I was feeling well under par with the lurgy that's going around when I took the measurement, so it's always possible I misread. I'll have to take a bit of the pipe into my local chandlery who stocks a few bits to be sure.

 

[VicS]

Thanks Vic.

That's what I thought, so I was a bit confused by my measurement!

According to this http://www.engineeringtoolbox.com/astm-copper-tubes-d_779.html, 1/4" pipe is 3/8" OD, which would be 9.5mm or thereabouts.

I was feeling well under par with the lurgy that's going around when I took the measurement, so it's always possible I misread. I'll have to take a bit of the pipe into my local chandlery who stocks a few bits to be sure.

The tables in engineering tool box are for nominal bore .


What you are interested in are the OD sizes, which are what I quoted. Unless something weird has been done by a previous owner.

 

[Dave_Seager]

The external diameter of the pipe is what matters as this has to match the compression fittings. There is a description of BS pipe sizes at http://www.engineeringtoolbox.com/copper-tube-working-pressure-d_20.html

 

[Dipper]

I'll have to take a bit of the pipe into my local chandlery who stocks a few bits to be sure.

When I did my gas system, a local plumber's merchant had the relevant pipe which was to the British Standard recommended by the Boat Safety Scheme. (I can't remember what it was though). You can also buy a cheap pipe bending tool that will take that size if you need to go round sharp bends.

 

[Dipper]

When I did my gas system, a local plumber's merchant had the relevant pipe which was to the British Standard recommended by the Boat Safety Scheme. (I can't remember what it was though). You can also buy a cheap pipe bending tool that will take that size if you need to go round sharp bends.

Here we are

seamless copper tube which conforms to BS EN 1057 with copper or
copper alloy compression fittings

Sorry. Misunderstood your post as I have man flu. You don't seem to need pipe.

 

[VicS]

The external diameter of the pipe is what matters as this has to match the compression fittings. There is a description of BS pipe sizes at http://www.engineeringtoolbox.com/copper-tube-working-pressure-d_20.html

But only of metric sizes. It is far more likely that Jissel's gas system is in Imperial sized tube/ pipe.

I already looked but failed to find a similar table of Imperial sizes in Engineering Toolbox

 

[earlybird]

Copper tube of fractional imperial OD, eg 1/4" OD, is available from suppliers such as ASAP and others. They also sell compression fitting to suit, based on OD measurement AFAIK.
The OP's tube would appear to be 1/4"

 

[alahol2]

I already looked but failed to find a similar table of Imperial sizes in Engineering Toolbox

Here you go... http://www.engineeringtoolbox.com/astm-copper-tubes-d_779.html

 

[ffiill]

I tend to use 8mm fittings and pipe as these are readily available from anyone stocking plumbing fittings.

 

[VicS]

Here you go... http://www.engineeringtoolbox.com/astm-copper-tubes-d_779.html

Thats the table based on nominal bore that Stemar linked to earlier (#4)