Hemp and PTFE on iron..

[Jay The Plumber]

just for my own interest this.

I've always jointed screwed iron on heating systems with hemp and paste (boss white, green, jet blue, blah blah) but I worked with a guy recently that was running hemp onto the thread as normal but then adding a couple of wraps of PTFE, no paste.
I've never come across this before, anyone been taught to do it this way ?

 

[cr0ft]

You could bud but you would probably get a leak why take the risk

So hemp and jointing compound is considered the best way then? I love learning stuff

 

[ShaunCorbs]

So hemp and jointing compound is considered the best way then? I love learning stuff

is more the old school way

loc 55 or 557

 

[Ch4 plumbing]

So hemp and jointing compound is considered the best way then? I love learning stuff

Id say loctite 55 is the cleanest and most fallproof way.

 

[ShaunCorbs]

Aparently I was the cheapest so the company are pretty sure I will get the work. It's gone to the charity now who are basically the customer. Keeping fingers crossed, I think these things just take time.

Have booked onto my commercial gas course anyway now just in case, if not am sure it will open more doors anyway.

did they give you an idea of how much cheaper ?

 

[cr0ft]

They just said I was 'extremely competitive' but wouldn't divulge prices. Just waiting to see now, have to be honest I assumed before quoting that the charity would approve up to a certain amount :/

 

[king of pipes]

Commercal gas alot to take in but very rewarding good for you bud , gas screwed pipework i use loctite 55 or gas tight paste or weld it or i did ha ha

 

[zzzjim]

So it sounds like you need a Gooey sealant to soak into hemp, for long lasting seal?
(hence not happening with PTFE .. (DIYers favourite=Not messy)==Bad FAIL)

 

[king of pipes]

Screwed pipework has now taken a back seat as it to labour intensive , and costly crimp is the way its going carbon steel , copper ,stainless , pex theres a system for them all Gerberit and yorkshire are just the main ones regards kop

 

[Jay The Plumber]

yea ive done a load of crimping up to 54mm, its certainly quicker, less smelly and you dont need a ton of the same gear like the screwing machine, chain vice (though still useful) and all the other stuff that goes along with it.

another thing the chap does I worked with is leave all the hemp on the fitting wheras I would always get a hacksaw blade and clean the joint up completely, just the way I was taught.

when we did gas, we just used boss green IIRC.

 

[Last Plumber]

Boss white and hemp !
Can't go wrong, love the smell, especially in van on a hot day.

Is that sad ?

 

[rpm]

Depends on what else in the van is smelly I guess.

 

[Last Plumber]

Depends on what else in the van is smelly I guess.

Only a tin of stag that smells lovely !

There must be times RPM when you smell like a Plumber ?

 

[rpm]

Only a tin of stag that smells lovely !

There must be times RPM when you smell like a Plumber ?

lol, and more mate.

 

[Harvest Fields]

Yeh mate done my share and i dont miss one bit busting ya bs on a pair of 36,s or chains happy to stick to domestic now leave it to the youngsters

Me too. 2" is to big for me

 

[Jay The Plumber]

my van almost always smells of kero these days

 

[Harvest Fields]

 

[ShaunCorbs]

Screwed pipework has now taken a back seat as it to labour intensive , and costly crimp is the way its going carbon steel , copper ,stainless , pex theres a system for them all Gerberit and yorkshire are just the main ones regards kop

Only use carbon steel press on a sealed system else you will have it rotting through in about 5 years

 

[Ch4 plumbing]

Only use carbon steel press on a sealed system else you will have it rotting through in about 5 years

Or sooner if you drain and fill the syatem alot!

 

[Last Plumber]

my van almost always smells of kero these days [/QUOTE
I burn it off. ( if it's in my oil catching baking tray) then it doesn't stink mi van out.

 

[king of pipes]

When i worked on commercial projects its all we used the council and health authorities would not allow hotwork after a team of roofers burnt a school down in norfolk .

 

[Jay The Plumber]

When i worked on commercial projects its all we used the council and health authorities would not allow hotwork after a team of roofers burnt a school down in norfolk .

national trust also, no hot work, we have to press everything or push fit etc

 

[king of pipes]

Agree with you bud i did some servicing and repair work for them nice work and paid very well, but no hot work regards kop

 

[king of pipes]

My jointing methods are as yours screwed heating pipework up to 2" hemp and paste - then cleaned off with a hacksaw blade - 2 coats of red oxide primer - 2" or above welded or crimp , gas services Rocol gastite paste or locktite 55 up to 2" above welded cheers kop

 

[DAVE01]

just for my own interest this.

I've always jointed screwed iron on heating systems with hemp and paste (boss white, green, jet blue, blah blah) but I worked with a guy recently that was running hemp onto the thread as normal but then adding a couple of wraps of PTFE, no paste.
I've never come across this before, anyone been taught to do it this way ?

Hello jay I have been a Plumber for 40 years and have used Flax or Hemp and Boss White This was on 1/2 To 4 inch GB Not likely to have a leek but use that PTFE Tape and go back a 1/4 turn And it will Sod If you screw a thread on GB most of the time there is small gap on the screwed thread so if you flax and boss white this joint and screw on a fitting prove this for yourself unscrew the same fitting and if by magic the gap in the thread is gone this is what the hemp and boss white are supposed to do as well as give you a water tight joint

 

[Howie153]

I just wondered if anyone remembers a liquid jointing paste called heldite we used to put this on with hemp black or dark brown horribly sticky stuff but never any leaks mind you couldn't get apart very easily if you needed to .

 

[Jay The Plumber]

I just wondered if anyone remembers a liquid jointing paste called heldite we used to put this on with hemp black or dark brown horribly sticky stuff but never any leaks mind you couldn't get apart very easily if you needed to .

I use heldite still, cos I'm an oily

 

[king of pipes]

Brilliant stuff for oil would not use anything else