Diesel pipe thread sealer

[snarling bee]

We are re-plumbing a diesel bowser with bigger pump and bigger pipes etc. Has anybody got any recommendations for a thread sealant?

 

[Lincs Lass]

Is ptfe chemical proof

 

[milkloss]

I would use the white paste that plumbers use. Compatible with oils and water etc, cheap as chips and comes part when you want it to.

edit: jointing compound..... heldite is the kiddie.

 

[Richy12]

Rectorseal is what the professionals use

 

[sjt01]

Loktite 55 seals my most difficult threads

 

[Ukjay]

What kind of pipe and what diameter?

If metal pipes, would Loctite 577 suit you - as it is a liquid ptfe sealer with medium strength bond that holds very well and is suitable for Petrol / Diesel etc. IIRC, it can be used on pipes up to 3" diameter?

 

[Gadget]

When we did a couple of bowsers, we used Stag (red I think)

 

[Lakesdigger]

Stag or any other paste suitable for fuel oil etc more than likely wouldn't be any good long term by itself. I'd use ptfe tape and a small dab of paste

 

[C.J]

 

[massey765]

ive used ptfe tape with success .........the joints have to be bleddy tight

 

[4course]

thats the dogs proverbials ,used some today on a outside central heating pipe as had to change the in line filter and couldnt stop seepage , sorted usually use it when cleaning the aga fuel lines

 

[CORK]

thats the dogs proverbials ,used some today on a outside central heating pipe as had to change the in line filter and couldnt stop seepage , sorted usually use it when cleaning the aga fuel lines

Does it need spotless threads to seal properly?

Reason I ask is that I have a leaky diesel threaded joint which I want to seal but it will be difficult to clean free of diesel where it is.

 

[4course]

doesnt seem to need perfection if not under pressure

 

[pettsy]

Used heldtite/stag on oil boiler fuel line joints a fair bit

 

[GHuggins]

Changing the subject I know sort of, but would these also work good for hydraulic pipe seals where they're under pressure? I was going to try some of the gasoila sealer as it was handy at the store, but figured even if I had to order something it would be better than having to do it a third time as I've already tried the worthless ptfe regular sealer to no luck.

 

[ewald]

Another vote for Heldite (or ‘black sh..te’ as our plumbers describe it)

Ptfe tape always leaks after a while with diesel

 

[milkloss]

Changing the subject I know sort of, but would these also work good for hydraulic pipe seals where they're under pressure? I was going to try some of the gasoila sealer as it was handy at the store, but figured even if I had to order something it would be better than having to do it a third time as I've already tried the worthless ptfe regular sealer to no luck.

I would unhelpfully say maybe. The lines should really seal themselves..... have they been over tightened? It tends to wreck threads and the mating faces up.

 

[snarling bee]

Thanks for the comments. I think I'll get some Heldite. Whatever the manufacturer originally used was black, and that has been good for well over 10 years, so I'll use the same.

 

[GHuggins]

I would unhelpfully say maybe. The lines should really seal themselves..... have they been over tightened? It tends to wreck threads and the mating faces up.

Problem was I installed a third function and loader valve assembly that I got somewhere out of Russia I think. Instead of being the usual tapered pipe threads it's like their dies were worn or run in too far - one screwed in by finger all the way? The only way I could get the loader valve fittings to seal was machine some washers and install O-rings to create flat face type seals combined with sealer and using a 1/2 pull bar tighten the living daylights out of it. The third function valve assembly only leaks when it gets hot, but I absolutely hate leaks, so....

Apparently the heldite has high ratings and is recommended for fuel, oil, hydraulics and everything, so I ordered some of it. Says I should have it by March some time. I'll let you know how it goes, but looks like it should work good. Thank You.

 

[YELROM]

Problem was I installed a third function and loader valve assembly that I got somewhere out of Russia I think. Instead of being the usual tapered pipe threads it's like their dies were worn or run in too far - one screwed in by finger all the way? The only way I could get the loader valve fittings to seal was machine some washers and install O-rings to create flat face type seals combined with sealer and using a 1/2 pull bar tighten the living daylights out of it. The third function valve assembly only leaks when it gets hot, but I absolutely hate leaks, so....

Apparently the heldite has high ratings and is recommended for fuel, oil, hydraulics and everything, so I ordered some of it. Says I should have it by March some time. I'll let you know how it goes, but looks like it should work good. Thank You.

Self Centering Bonded Sealing Washers To Fit 1/8 inch BSP Simply Bearings Ltd

simplybearings.co.uk

It sounds like you want dowty washers to seal your pipe fittings