Leak from indirect part of HWC

[Redhotferrari]

Hi Guys,

Recently fitted an indirect cylinder and on filling up the central heating and running for some hours have noticed a small buy damn annoying leak on the top connection of the coil, Its not from the cylinder, but seaping out of the female iron, about a drip every minute or so.

I now have to drain the system again to sort this out, any tips on ensuring that it does not happen? I assume PTFE on the cylinder thread might help, but am I missing something.

Its so annoying after spending hours cutting and replacing pipework where no soldered joints leak to have a thread leak!

Any advice greatly appreciated

 

[ChrisR]

I assume PTFE on the cylinder thread might help

Didn't you use any?

 

[Redhotferrari]

Sure did, maybe not enough though!

 

[Redhotferrari]

Any one with any suggestions, your advice greatly appreciated as always

 

[wiggikins]

Hemp and paste? Keith.

 

[namsag]

I HOPE you have not used IRON fittings on the cylinder as in a couple of years time they are likely to go PING followed by a big WOOSH as the water floods

 

[Redhotferrari]

IRON!! No used brass. Managed to cure it with a few more winds of PTFE and gobs a good un!

Thanks for your advice, Might try hemp next time

 

[Garfeild]

Use proper cylinder unions,ive never had one leak.