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Leaking Cylinder joint (fibre washer) at pipe outflow
Posted: Thu Jan 16, 2014 6:31 pm
by malcia
I have a leak at the central heating outflow pipe where it is coupled to the hot water cylinder. The fibre washer appears to have disintegrated.
See attached images
What steps need to be taken to replace the washer - and will this alone solve the problem?
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Re: Leaking Cylinder joint (fibre washer) at pipe outflow
Posted: Thu Jan 16, 2014 11:20 pm
by proptech
Hi
Looks like that's been leaking for a while. unfortunately any sealing washer is on the inside of the cylinder. I used to make a point of checking the nuts were tight on a new cylinder, they did need a bit of a tweek on occasions
What to do now - Well if I was doing it, I would drain the cylinder, back off the nut, and (being old fashioned) make up a grommet from hemp and joint compound. PTFE could be used, or at least worth a try.
This could well be a case of getting some professional help if you're not used to plumbing work, or haven't the tools. But don't be surprised to be told a replacement cylinder is the answer.
Re: Leaking Cylinder joint (fibre washer) at pipe outflow
Posted: Fri Jan 17, 2014 10:19 am
by malcia
Thanks - I do have the tools and some plumbing experience.
Are you saying that because the seal is inside the cylinder then replacing only the fibre washer is not enough? You suggest hemp and "plumbers mate" made into a washer to make a seal on the outside??
Where do I get hemp?
Re: Leaking Cylinder joint (fibre washer) at pipe outflow
Posted: Fri Jan 17, 2014 1:31 pm
by proptech
A proper plumber's merchants should be able to supply. But NOT Plumbers
Mate, you need an ordinary jointing compound such as Boss Green.
I would suggest winding hemp and compound around the thread, but keeping it as close to the cylinder as possible. The intention being to create a grommet that will compress onto the thread at the same time as against the cylinder.
That's a lot easier to do than it is to explain !
Best of luck with it, but, as I've said, you may end up with a new cylinder.
Re: Leaking Cylinder joint (fibre washer) at pipe outflow
Posted: Sun Jan 19, 2014 2:31 pm
by malcia
How long do I need to let the jointing compound dry before re-filling the cylinder?
Thanks for your help with this!
Re: Leaking Cylinder joint (fibre washer) at pipe outflow
Posted: Mon Jan 20, 2014 9:06 am
by proptech
You don't have to wait, Just do the job and hope for the best.
Re: Leaking Cylinder joint (fibre washer) at pipe outflow
Posted: Wed Jan 22, 2014 2:34 pm
by malcia
Thanks for your help - I have completed the job and it is not leaking - so success!
It saved quite a significant amount of work and costs as the cylinder is built into a cupboard which on one side is also a fitted wardrobe. While I needed to remove some internal shelving to access the cylinder bleed valve it saved me removing the entire floor to ceiling frame and doors which would have been necessary to replace the cylinder.