1/2" barrel joints

[brk1]

What is the best joint sealant for tapered steel joints. The Pipe will be chased into a wall so will be permanent and not really accessible . What is the best method and reasons why. I've done lots of reading and all have there benefits or downfalls, one post went on for 9 pages once the bitching started so short simple answers will be good.

Jet Blue - semi permanent gasket type joint that sets and is suitable for virtually anything that runs inside it -maybe best for permanent solutions

Boss Wite or Similar paste - easy to apply non setting compound bit old in the tooth but lasted safely for ages

Gas ptfe - easy one wrap solution -reported maybe degrades with gas -not really proven anywhere but joint would become loose if it did

Gas Ptfe and Paste - again complete seal but supposed reaction between tape anf paste making unsafe for permanent situations

Loctite 55 - One of the latest non setting solutions that passes all the tests with flying colours, just not readily available off the shelf locally


So any advice for the best permanent solution, the pipe will be behind kitchen units and tiles etc so could be got at but would require a lot of work to expose it

 

[denso13]

What's the pipe for?

 

[doitall]

Loctite 55 string is available at any merchant as far as I know.

For most uses you wont beat it.

 

[Dan Robinson]

I used loctite 55 - it rocks.

PTE sucks great big hairy donkey balls.

Liquid ptfe is good if used properly.

 

[boabcelt]

Another vote for Loctite55, I use the stuff near every day and have done for the past 3 or 4 years.

 

[brk1]

Thanks for the replies , sorry pipe will be holding gas, it's going to be done in barrel for the simple reason that my house only has a party wall that's solid 4" red brick (fact not a guess), it might well be overkill at the moment as my neighbours house is complete their side of the wall with a hob , extractor above it and fully tiled behind the hob, but who knows what might be done in the future, virtually the same set up will be my side of the wall when all works are finished, but you never know what DIY specialist might get drilling in the future I know my gas supply will be virtually 100% safe if its in 1/2" barrel, they'd physically have to drill 4" through from their side then change to a sharp metal drill to be able to puncture the barrel, but from the setting out of both houses that's the only place an oven or hob could go there's a window on the opposite wall. and if someone was stupid enough to drill from my side above a gas bayonet then they would hit the barrel within 20mm of drilling and would know something was not right instantly

Haven't had a chance to look round for Loctite 55 yet, but even the "Shop" link sends you to screwfix, they don't have it anywhere at the moment, locally or online, same at toolstation, don't stock it so will have to keep my eyes open ,haven't tried local merchants yet

 

[doitall]

Screwfix and tool station stock it, always have.

In fact screwfix were doing free sample rolls not long ago.

This is the small roll.

http://www.screwfix.com/p/loctite-55-pipe-seal-cord-50m/42142

 

[brk1]

Should stock it, follow your own link and see what it says, from my end it come up as not available to order online and nowhere in a 20 mile radius of me has any in stock and the whole of toolstation doesn't stock it, most online retailers want more to post it than it costs in the first place

 

[doitall]

Thats mad.

If you haven't got a merchant close use these.

http://www.bes.co.uk/products/213.asp

 

[brk1]

Thank you doitall ,I've just found a fleabay seller doing 150m rolls for £7 delivered, by the time I've driven about and located a small roll ,I'll be no better off, might as well let it come to me

 

[denso13]

Ok, I have to ask, you're putting a steel gas pipe embedded in a party wall with joints which will not be accessible, behind kitchen units and tiles? Are you doing it? Are you sure that's the best approach?

 

[swbjackson]

It's the way it's been done for years. It's not unusual to have a gas carcase buried in the walls in a 1940s house still in good condition.

 

[denso13]

gas carcase buried in the walls in a 1940s house

as were pipes for gas lamps etc. but would you seriously do that on a job now?

 

[doitall]

I assumed the chasing in the wall bit was a laugh.

No way can you cut 50mm out a a 100mm party wall.

 

[brk1]

Your welcome to ask, I have nothing to hide, no I'm not doing the work, I'm just getting all the stuff for the best possible job that I can, not every gas regged plumber carries around the equipment to be able to thread 1/2" steel, yes they can all get it done for you,I've gone the other route of supplying custom made parts ready to use, all cut and threeaded at a proper heating company. I have cut the chasing myself all to less depth than building regs say is the maximum depth permitted, perfectly upright, building regs allow you a third of the wall for upright chasings, so I'm allowed 33mm, I'm actually only in there 28mm to take a 21mm O.D steel pipe.

Yes I would go to the bother of chasing it into a wall, would you want 2m of surface mounted gas pipe in your new kitchen, or drop it down in a cupboard and have meters more of surface mounted pipe showing

The pipe will be solidly fitted into the wall with sand and cement then plastered over so it''s totally sealed, the pipe is basically to replace the old original lead pipe that is suface mounted next to it, It's only in steel because of the thin party wall, lets face it, gas pipe is often just normal soldered copper pipe that sits in a plastic sleeve, much easier to damage than what I'm having fitted ,the top joint will actually not be under the plaster, but above the ceiling height and will be going into a vented space that goes straight outside, the bottom joint will be plastered in and finished from the 1/2" steel bend straight into a brass bayonet fitting, I'm not into a cavity so will not have gas escaping into unvented voids,that's why I asked what was best for a permanent joint, whether to have it done with a permanent setting type compound like Jet Blue rather than non setting type sealants, nothing can be hit to make the joints go loose. I will actually get an increse in gas pressure when its done as there must be a few meters of old lead pipe twisted up in the ceilings that will be removed once the new cooker feed is in, there is already a 22mm gas main 2m away that feeds the boiler from where the cooker point will be, so actually about 4m of new piping will be added, and probably at least 7m of old bent lead mains being removed,maybe even more

Although I'm not doing the work myself I have prepared everything ready for whoever I decide is doing the work, whether it be my old mate Roy who is fully gas regged or one of the plumbers where I'm working at the moment. all who are fully gas regged as well. I'm competent myself but will not do the gas work myself, I fitted my whole central heating system myself, then got a gas regged plumber or Corgi as they were in those days to do all the Gas work to it, pressure test and commission it etc, I have totally gutted my bathroom, fitted a new suite, renewed my mains stopcock and altered the kitchen plumbing to suit and all without one single leak,