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BSP fittings on gas hose


Question

From my measurements, this is a 3/8" BSP parallel male fitting, and I want to reduce it to 1/4" BSP male.

image.png.93a197851066de4954728bd9773ec446.png

It looks to me as though the gas seal should take place on the hemispherical compression surface surrounding the hole, but the reducers I've seen don't have any ball etc inside them to seal against, and they don't mention having a taper thread.image.png.b4ad08b12b675e6ceca9cc9aa9602a93.png

I could go out to a tail, and back, via some flexi hose but that looks a bit stupid.

 

image.png.eaf8b1d3894c456caceabb927863b733.png

How to I ensure a gas-tight seal?

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2 hours ago, Nippy said:

From my measurements, this is a 3/8" BSP parallel male fitting, and I want to reduce it to 1/4" BSP male.

image.png.93a197851066de4954728bd9773ec446.png

It looks to me as though the gas seal should take place on the hemispherical compression surface surrounding the hole, but the reducers I've seen don't have any ball etc inside them to seal against, and they don't mention having a taper thread.image.png.b4ad08b12b675e6ceca9cc9aa9602a93.png

I could go out to a tail, and back, via some flexi hose but that looks a bit stupid.

 

image.png.eaf8b1d3894c456caceabb927863b733.png

How to I ensure a gas-tight seal?

That`s the back of a welder you will find what you need here  https://www.r-techwelding.co.uk/welding-equipment/gas-regulators-flow-meters

If they don`t and you don`t want a reduced tail PTFE tape will do the job 

Edited by Long time lurking
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Does this look about right? https://www.ebay.co.uk/itm/Brass-BSP-straight-hose-adaptors-converts-1-4-female-hose-to-fit-3-8-male-torch-/262860558124

This will get you onto a cone but then you'd need a fitting to get onto a tapered thread or a BSP hosetail: https://www.weldability-sif.com/pages/view_product.asp?product_string=DA6003814SLH

 

I find it a bit of a mare trying to find correct BSP fittings as different suppliers use different terminology. It's easy to buy what looks right on the web and it turns up and it's wrong.

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1 hour ago, Nippy said:

Cheers, that's along the right lines. Surprised at their low prices, but they don't do 3/8 BSP female to 1/4 BSP male. Maybe I'm trying to do the wrong thing?

They are good to deal with to especially so for their machines 3 year warranty pick up and delivered free of charge and they use Siemens inverters on most if not all their kit 

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30 minutes ago, Bandit Banzai said:

I dunno mate, look a bit closer.

There's a ball in the other mating half, so this should seal onto the chamfer in the adaptor you suggested. Many of the reducers I found for myself on the internet had no seats for sealing, so they must have been relying on taper to seal (BSPT), which I didn't think would mate with parallel (BSPP). I don't need to experiment in that direction now.

image.png.5af2bcfdcb82098cc6bb4fa0f22aeb59.png

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On 19/08/2020 at 18:03, Bobthebuilder said:

Why do you want to reduce it to 1/4" ? What KW rating is the appliance? can enough gas flow through 1/4" pipework to ensure 20mb working gas pressure at the appliance burner?

You dont want to be burning gas under 20mb, the result is carbon monoxide, not very nice stuff.

 

The Gas man cometh. You know more about these things.

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