PTFE tape or liquid airline sealant or something else

[Rig Pig]

The drawings above show the normal shoulder and thead seal, it is possible to end seal if the fittings are designed to do it.

The fitting in the picture is a plumbing fitting, probably parallel.

 

[Rig Pig]

It makes life a lot easier if you spec taper fitting as you can tweek them to line things up.

 

[123hotchef]

The drawings above show the normal shoulder and thead seal, it is possible to end seal if the fittings are designed to do it.

The fitting in the picture is a plumbing fitting, probably parallel.

i THINK THE CHINA doh fitting is BSPT that is my problem, the fitting in the uk seem more expensive now i know why

 

[123hotchef]

It makes life a lot easier if you spec taper fitting as you can tweek them to line things up.

where is the best/cheapest place for such fittings?

 

[Rig Pig]

where is the best/cheapest place for such fittings?

I buy any I need from my local hydraulic suppliers.

 

[123hotchef]

are the normal pcl qr fittings from screwfix BSPP

 

[Rig Pig]

are the normal pcl qr fittings from screwfix BSPP

Sorry I don't know, ask before you buy!

 

[CKJDJK]

Loctite 572 is also very good as its liquid ptfe. It does not set as hard as 577 so is easier to dismantle if required. I use this on all sorts of joints as an anti vibration and sealant on sump plugs and pipe joints. clean dry joints are required normally. Leave to set for 15 minutes. A small ring of 572 in the gap between the washer and the fitting is usually enough.

 

[123hotchef]

Sorry I don't know, ask before you buy!

they are taper! http://www.screwfix.com/p/pcl-airfl...et/4118h#product_additional_details_container

do they sell a BSPP to BSPT adaptor?

 

[rcx132]

123Hotchef, you always move subjects that I'm interested in! I've never had leaky joints and when I assembled my air filter assembly they all leaked!

Are the fittings correct? You're not trying to fit taper and parallel or parallel x parallel together With tape? A lot of problems come from mixing threads, they bottom out or run out of threads before the threads bind and deform to form the seal.

So which joints can come together? I would have thought that tapered vs parelled is ok as you still have a tapered side which will tighten against the parallel joint.

Is that the thicker one designed for 2 wraps, i dont use it and stick to the traditional thinner original ptfe tape.

The gas PTFE stuff isn't good. When I worked as a plumber, two decades ago, we were told not to use gas PTFE even on gas fittings because it doesn't seal properly. One of the many regulations that we were told to ignore.

Loctite 572 is also very good as its liquid ptfe. It does not set as hard as 577 so is easier to dismantle if required. I use this on all sorts of joints as an anti vibration and sealant on sump plugs and pipe joints. clean dry joints are required normally. Leave to set for 15 minutes. A small ring of 572 in the gap between the washer and the fitting is usually enough.

I was going to ask this as well, so Loctite 572 is semi-permanent? Will it mean that my valves and garden tap will stop turning around in it's flange if I use 572 instead of PTFE?

 

[gordon stephenson]

You can also get liquid PTFE, I't pretty good on difficult sealing jobs, Or good old boss white and hemp string,

 

[8ob]

are these BSPP OR BSPT? http://www.toolstation.com/shop/Plumbing/d20/Compression/sd2697/Brass+Socket/p24305

That is a parallel thread Mr Chef, normally used on a running nipple with backnuts.

Bob

 

[123hotchef]

I just ordered some 577. Don't talk about garden taps lol

 

[123hotchef]

That is a parallel thread Mr Chef, normally used on a running nipple with backnuts.

Bob

Thanks I have used those with the reducing bushes on my compressors with no leaks I think they are not compatible with the China Ts in bspt

 

[Wightsparks]

For pipe/threads/joint sealing I am a devout LSX user. Stuff is just great. https://www.fernox.com/plumbing-consumables/ls-x-external-leak-sealer-50ml

 

[bricol]

A taper male thread will seal in a parallel female.

I'd use more tape . . . or loctite pipe seal 565 or 567 . . . I have been known to use both to seal 22Bar water fittings when one was NPT and one BSP . . . but I wouldn't put that on a drawing . . .

 

[zx9]

For pipe/threads/joint sealing I am a devout LSX user. Stuff is just great. https://www.fernox.com/plumbing-consumables/ls-x-external-leak-sealer-50ml

LSX is good stuff but the OP asked about fittings on an air receiver, LSX is cured by moisture so more suitable for water connections.

 

[123hotchef]

For pipe/threads/joint sealing I am a devout LSX user. Stuff is just great. https://www.fernox.com/plumbing-consumables/ls-x-external-leak-sealer-50ml

I have some of that in my box

 

[HockeyNomad]

One problem I had was that all my fittings were bspt, and my hose was bspp but with 60 degree taper sealing face, so no amount of tape or loctite would seal that, in the end I got a bspp 60deg to bspt adapter. All good after that, it was only a couple of quid on ebay for the fittings

http://m.ebay.co.uk/itm/Bspt-Male-t...%3A928f205e15c0abc2cca232fefffd04ba%7Ciid%3A2

 

[Bill Edwards]

You really can't beat having the correct fittings!
But a few wraps of PTFE or some of the alternative products available (given time to cure) can quite often do the job, but you may be relying on luck.