Gas pipe thread size?

[BouncyBoatFolk]

Hello all, I am trying to convert my single regulator to a dual manual switchable type. I specifically want the manual type as being empty headed I will eventually end up with two empty cylinders . The metal feed pipe to the vans gas manifold is shown in picture one, alongside the Gaslow cylinder I have converted to a standard POL fixing.
Photo 2 shows a vernier measurement in imperial size of the male thread of the flexi pipe that fits into the vans metal supply pipe.
What size is that threaded male connector in BSP? I think will need some sort of adaptor to attach the new switchable regulator to the vans metal union pipe.
This is the regulator I had in mind for the job, this has a 3/8" BSP female connection on the bottom as standard.
<Broken link removed>

Thanks in advance for any help.
Mike.

 

[Lenny HB]

This was the setup on our 1st motorhome, a metal T piece with the hoses connected to it and a separate regulator on each cylinder.

 

[donkey]

If you Google BSP threads it will give you all the dimensions you are seeking.

Geoff

 

[BouncyBoatFolk]

This was the setup on our 1st motorhome, a metal T piece with the hoses connected to it and a separate regulator on each cylinder.

View attachment 573820

Thanks Lenny, Yes in the absence of any other alternative I may well end up with same set up.

 

[BouncyBoatFolk]

If you Google BSP threads it will give you all the dimensions you are seeking.

Geoff

Thanks, yes I did try that, but nothing matched the measurement shown on the vernier?

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[BouncyBoatFolk]

This was the setup on our 1st motorhome, a metal T piece with the hoses connected to it and a separate regulator on each cylinder.

View attachment 573820

Sorry, just a thought, with that set up would you have shut down both bottles if one was removed?
I have seen a just a manual switchable valve on EBay, so could add a regulator to each of the flexi hoses, but decide between active bottle or both off from the valve.
Manual selection valve,
<Broken link removed>
Mike

 

[dazandandrea]

is that of any use?

 

[TheBig1]

Personally I would fit a new bulkhead regulator with a manual changeover and standard w20 to POL pigtails

 

[TheBig1]

<Broken link removed>

 

[Manic]

I‘ve got a regulator on each bottle into a Y piece, similar to Lenny HB first van set up, works for me.

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[BouncyBoatFolk]

Thanks for looking, I wonder if my trusty verniers are on the blink, I'm unable to reconcile any comparison to the reading on them of the threaded male insert shown in my photo to any BSP dimension??
I'll pop in the local plumbob shop tomorrow, they should be able to give me a steer.
Mike.

 

[TheBig1]

Thanks for looking, I wonder if my trusty verniers are on the blink, I'm unable to reconcile any comparison to the reading on them of the threaded male insert shown in my photo to any BSP dimension??
I'll pop in the local plumbob shop tomorrow, they should be able to give me a steer.
Mike.

looks to be half of an 8mm compression fitting.

 

[donkey]

It may not be BSP. Loads of metric threads out there.

Geoff

 

[BouncyBoatFolk]

<Broken link removed>

Many thanks, I found similar, but run into the same problem, until I can identify my vans gas supply pipes [ shown on the right in photo one ] female union nut size, I'm not able to order the double male reducer required to attach the 3/8" female end of the regulator to the van. Every thing else is straight forward, I think!
Mike.

 

[mitzimad]

It may not be BSP. Loads of metric threads out there.

Geoff

not usually on pipework its nearly always bsp unless its american

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[dazandandrea]

Your measurement of 0.548 is a bit off.
1/4" Bsp is 0.528
3/8" is 0.656

 

[donkey]

not usually on pipework its nearly always bsp unless its american

I agree, so do not understand why the OP is having such a problem identifying it, he only has a very few to choose from.

Geoff

 

[BouncyBoatFolk]

Your measurement of 0.548 is a bit off.
1/4" Bsp is 0.528
3/8" is 0.656

Brilliant, that looks close enough, so It looks like I need a 3/8" BSP, to 1/4"BSP reducer as a connector for the regulator to my vans union pipe.
Mike

 

[Two of usI]

It looks to me like your vernier is measuring across flats of nut and not Diameter of thread !!!

 

[BouncyBoatFolk]

It looks to me like your vernier is measuring across flats of nut and not Diameter of thread !!!

No, it was across threads, [ across and along] the appearance is just because I laid it out flat on the table to photograph.
It's possibly as I mentioned, my old verniers might need a recalibration for more accuracy.
Mike.

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[dazandandrea]

Digital verniers just need closing up and zeroing out.
Unless wet they very seldom give crappy reading.
If you need any more help with the thread size , giz a shout .

 

[BouncyBoatFolk]

So, a trip to the plumbing shop proved unfruitful, in as much as it isn't BSP. Some careful scrutiny of the hose connection revealed some information held on it, after a good clean. That information links it to being a 1/4 lks thread, anybody else heard of this fixing thread?
I'll need to do some more homework to find an adaptor to get me to 3/8"BSP, joy

 

[dazandandrea]

Ive never heard of that before and im making threaded parts everyday.
Ill doba search for it see if i can find anything

 

[dazandandrea]

The Din 4815 as far as i can see relates to the flexible hose .

 

[BouncyBoatFolk]

More info, GOK is the brand name on the hose, they are a German gas products manufacturer/supplier. I have found a stockist in Sunderland. Intergas UK. I have sent them some sizes and photos to hopefully find an adaptor that gets me to something BSP.
The rather unpalatable alternative is to cut my existing hose just above the odd sized union and put an 8mm barbed 3/8" BSP connector in.
I can then order some off the shelf replacement parts to get me to where I hoping to be.
Fingers crossed they can supply a straight forward male GOK thread to a male 3/8" BSP.
Mike.

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[jockaneezer]

BouncyBoatFolk, I'm wondering if it's one of these metric fittings ?
0.548" is near enough 14mm, is the pitch of your thread (peak to peak) 1.5mm ?

 

[SandraL]

The fitting you are measuring in first post, is this to conect to a steel or copper pipe with an olive? ie a compression fitting.
If so the nut to contain the olive would be supplied as part of the fitting. It would not need to be any particular thread, as long as it matched the fitting.

When valves and fittings are supplied to fit to other threaded fittings then the thread is specified.

But a compression fitting, which I think this is, is supplied complete with nuts with out a need to specify the thread, or match another fitting.

I,m not a gas fitter so this is my untutored take .

 

[BouncyBoatFolk]

BouncyBoatFolk, I'm wondering if it's one of these metric fittings ?
0.548" is near enough 14mm, is the pitch of your thread (peak to peak) 1.5mm ?
View attachment 574112

Thanks, I'd say it was damn close. Needs to be a male fitting into anything BSP.

 

[jockaneezer]

Next question, I'm viewing on a tablet and the pic isn't showing up too well, but does the flexible pipe in the van have a compression olive on it ?

 

[BouncyBoatFolk]

Next question, I'm viewing on a tablet and the pic isn't showing up too well, but does the flexible pipe in the van have a compression olive on it ?

It looks like an "O" ring, that slides into hollow part of the male fitting. I'll try and get a better photo. Ignore the "Gaslow" filler pipe behind the pipe in question.
Mike.