Solder joint

[Ermintrude]

Messy and not needed. Jet blue is fine for compo.

 

[Julian_P]

Why not loctite 55 on ALL threads not just rad valves?

Because the thread is not the seal. The seal is provided by the olive, the thread just provides the mechanical force to compress the olive onto the pipe and force it onto the taper.

As far as domestic plumbing is concerned you don't need anything on the thread at all.

Julian

 

[ma701ss]

Because the thread is not the seal. The seal is provided by the olive, the thread just provides the mechanical force to compress the olive onto the pipe and force it onto the taper.

As far as domestic plumbing is concerned you don't need anything on the thread at all.

Julian

Ok but why are others on here suggesting to use jet blue on threads and around olives?

 

[LPC]

First up, Ring a plumber before you bring your ceilings down or something. You don't know what you're doing.

But: Always heat test your joints too (aka put the heating on full). The flux in the joint can actually hold pressure when the water is cold. Heat the system, flux melts, new leak.

I use 12 wraps of PTFE with a small smear of LSX on valve spigots. If you want to be foolproof, get some 'one wrap' ptfe which is thicker and put 1 wrap of that round, with a bit of an overlap. Wrap the PTFE in the direction of thread, and I like to run it into the thread with my nail all the way up so it doesn't back up.

LSX on the olive, it will never leak. You don't need anything on compression joint threads, because it won't do anything. Number one sign of a clueless DIYer is PTFE on a compression thread.

 

[ma701ss]

First up, Ring a plumber before you bring your ceilings down or something. You don't know what you're doing.

But: Always heat test your joints too (aka put the heating on full). The flux in the joint can actually hold pressure when the water is cold. Heat the system, flux melts, new leak.

I use 12 wraps of PTFE with a small smear of LSX on valve spigots. If you want to be foolproof, get some 'one wrap' ptfe which is thicker and put 1 wrap of that round, with a bit of an overlap. Wrap the PTFE in the direction of thread, and I like to run it into the thread with my nail all the way up so it doesn't back up.

LSX on the olive, it will never leak. You don't need anything on compression joint threads, because it won't do anything. Number one sign of a clueless DIYer is PTFE on a compression thread.

Awww, come on everyone's got to learn! You could argue everyone else who gave advice on this post that differs to yours also doesn't know what they're doing ;P I might not be a plumber but I'm usually pretty thorough with everything I do around the house. I managed to hang the rad, cut the old pipe, bend new tails, solder them together and fit the valves all with no problems except for one slow leak on a solder joint and at both sides of the rads. I bought some Loctite 55 and jet blue today so will give that a go. I'll make sure I wrap loads of PTFE tape around the compression threads just to annoy the next plumber who comes along! If the ceiling comes down I'll claim on the home insurance haha!!

 

[Gray0689]

Awww, come on everyone's got to learn! You could argue everyone else who gave advice on this post that differs to yours also doesn't know what they're doing ;P I might not be a plumber but I'm usually pretty thorough with everything I do around the house. I managed to hang the rad, cut the old pipe, bend new tails, solder them together and fit the valves all with no problems except for one slow leak on a solder joint and at both sides of the rads. I bought some Loctite 55 and jet blue today so will give that a go. I'll make sure I wrap loads of PTFE tape around the compression threads just to annoy the next plumber who comes along! If the ceiling comes down I'll claim on the home insurance haha!!

Everyone does it there own way
15 to 20 turns ptfe
And a bit of jointing compound of your own choice
No ptfe on threads no need just looks silly anyway lol
insurance company's are cracking down on DIY insurance claims

 

[Julian_P]

Ok but why are others on here suggesting to use jet blue on threads and around olives?

As LPC says: ''Number one sign of a clueless DIYer is PTFE on a compression thread.''

Put some around olives if that makes you feel better, but I've always found a joint with an olive to be perfectly water tight provided you tighten them properly - that's the bit that the DIY'er often fails on I think.

Julian