1/2" BSP connection

daveaspy · 16 Jul 2020

I have a 1/2" BSP bush I want to connect to some 22mm pipework, but not sure on the right thing to get a good seal. I have a 22mm tee with a 1/2" pipe connection but the threads are parallel and the bush just goes all the way in, and doesnt bottom out either so not really an option for a washer (and the bottom of the 1/2" female isnt really wide enough to support a washer)

I was thinking a load a PTFE might be enough?

Alternatively, I have a 1/2" tap connector which has a rubber washer that would seal against the flat bottom of the bush, however the tap connector has a bit of pipe protruding past the washer and the hole in the bush is not wide enough to go over it. I could drill the hole out on the bottom side of the bush to 15mm to make it fit, but don't currently have a bit that size so need to either order a bit or better still a fitting that would work - is there anything??

Terrywookfit · 16 Jul 2020

What goes into the bush

daveaspy · 16 Jul 2020

1/8 NPT pressure sensor goes in the other end

Terrywookfit · 16 Jul 2020

Loctite 55 cord would be my choice.

Gasguru · 16 Jul 2020

Just wind PTFE tap round the thread and form a taper...with the right no. of turns and taper the thread won't bottom out...or Loctite 55 cord.

oldbuffer · 16 Jul 2020

Or Flomasta Pipe Seal. Good stuff and easy to use.

daveaspy · 16 Jul 2020

Thanks all, will give the PTFE a chance then get some Loctite if it fails

Jackrae · 16 Jul 2020

Why not buy the correct part for the job and avoid the botch-up of forcing taper into parallel
Maybe this https://www.ebay.co.uk/itm/Male-Bsp...376068?hash=item1a743e17c4:g:F-sAAOSwrWNcWplh

Edit just noticed it's NPT on the 1/8" side

Edit 2 1/8BSP is 28TPI whereas 1/8NPT is 27NPT As long as you can get at least 3 threads to mate, with sealant or tape, then you should get away with it

daveaspy · 17 Jul 2020

Jackrae said:
Why not buy the correct part for the job and avoid the botch-up of forcing taper into parallel
Maybe this https://www.ebay.co.uk/itm/Male-Bsp...376068?hash=item1a743e17c4:g:F-sAAOSwrWNcWplh

Edit just noticed it's NPT on the 1/8" side
Edit 2 1/8BSP is 28TPI whereas 1/8NPT is 27NPT As long as you can get at least 3 threads to mate, with sealant or tape, then you should get away with it

I could swap my bodge for your bodge

Thanks for looking though

I've got a good seal on my parts with tape at 6 bar so should be good enough

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1/2" BSP connection

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