hot water cylinder

[emmkat]

I have installed a hot water cylinder. I had to put 28mm x 1" female couplers on the heating coil threads. I put some ptfe on and wound right down to the back nut that is on the wall of the cylinder. but I am getting a very slow drip from each fitting. should I have put more ptfe tape on so as not to be able to reach the back nut. I cant tighten it anymore as they are too close to get a spanner on each nut. appreciate any advice. Thanks.

 

[emmkat]

 

[emmkat]

anybody ?

 

[jackthom]

I can't see what else you can do unless it's a very very slow drip and you live in a hard water area which may eventually help seal the threads.

It is a pain if you have to drain down again, we've all been there.

 

[emmkat]

but do I need to screw the fixing right down to the nut or put enough ptfe on it so it tightens before it reaches the bottom. or is there a better type of thread seal I could use ? . thanks for replying

 

[HERTS P&D]

More ptfe tape is needed.

Andy

 

[Hugh Jaleak]

Good application of PTFE and smear some jointing compound on for good measure. Should tighten before you run out of thread.

 

[Madrab]

If you use gas grade PTFE tape, it's thicker and will allow it to seal easier.

 

[emmkat]

Thanks

 

[Tibbot]

The heating coil should be joined to your pipework using proper cylinder union connectors, not female iron couplings.

 

[emmkat]

they are proper cylinder union connectors perhaps I described it wrong, but thanks have cured drip now but another problem. No hot water! flow pipe hot return cold, thinking an air lock but no vent how best to get the air out.

 

[halfway]

they are proper cylinder union connectors perhaps I described it wrong, but thanks have cured drip now but another problem. No hot water! flow pipe hot return cold, thinking an air lock but no vent how best to get the air out.

I hope I am wrong, but it could be that while doing the other work, you allowed the cylinder fitting to twist, thus causing the internal coil in the cylinder to kink.
A tip to avoid this is to fit the fittings together without any sealing and count the turns until it bottoms out. Then when refitting with sealing tape/compound, count your turns so as not to over do it.

 

[emmkat]

I was very careful not to do that but wouldn't I not get any heat to the rads?

 

[emmkat]

Also if it has kinked would I be able to fix it without replacing tank.

 

[halfway]

Your rads would still work. It used to be possible to do it in days past. Not sure if it would be feasible nowadays.