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Leaking elbow connection on hot water cylinder


 
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DJS1

from United Kingdom

Joined: 21 May 2009
Posts: 24
Location: Wiltshire,
United Kingdom

PostPosted: Fri Jan 29, 2010 3:48 pm Reply with quote

I replaced my vented hot water cylinder last year because the coil was leaking into it. The elbow connector that joined onto the thread of the prefitted coil was vertical when fully tightened on the old cylinder, but on the new cylinder it's a few degrees past the vertical (nearer the 11 o'clock position rather than 12.00) and over time has worked loose and is leaking(I guess its because the existing pipework pulled it back to vertical). Can I put a felt washer on the joint so that's it's tight when vertical and is there any jointing product I can use in case of weeps?

Thanks in advance for any help.
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Gasop

from United Kingdom

Joined: 25 Oct 2009
Posts: 251
Location: Southampton,
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PostPosted: Fri Jan 29, 2010 5:49 pm Reply with quote

You will have to remake the joint with PTFE tape or thread sealing string .

You cannot use a sealing washer on the kind of joint you have on your cylinder.

Applied correctly there will be no weeps or leaks.
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Hugh Jaleak

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PostPosted: Fri Jan 29, 2010 6:22 pm Reply with quote

You need to redo the joint as described, and then adjust the pipework to fit. Trying to 'force' pipework to fit is asking for trouble IMO.

I changed a cylinder that had split recently as previous installer had forced return to fit it. The pressure on the primary return tapping has split the cylinder at this point. I cut it off and realigned it to fit correctly.
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DJS1

from United Kingdom

Joined: 21 May 2009
Posts: 24
Location: Wiltshire,
United Kingdom

PostPosted: Fri Jan 29, 2010 8:09 pm Reply with quote

Thanks for your replies.
I made the original joint in PTFE, then tried to remake it bulking it out with further PTFE in order to get the joint tight and vertical - which obviously failed in the end. Am I likely to be able to achieve this with the sealing string or am I just going to have to redo the original pipework? If I have to do some pipe bending I will, but I'd rather not have to right now.

Cheers again
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lilleville

from United Kingdom

Joined: 28 Jan 2010
Posts: 30
Location: Hertfordshire,
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PostPosted: Fri Jan 29, 2010 10:56 pm Reply with quote

You really need boss white and hemp on cylinder joints, PTFE is too lightweight! You need to re-do the pipework so it sits comfortably. Its no good forcing the pipes, as matey said, you're asking for trouble. Sometimes the only way through it is through it! Sorry!!
Beware not to crack the weld holding the coil in place by forcing it or over tightening it! Got the tee-shirt for that one!!
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The following user says thank you to lilleville for this useful post:
Nige F (30 Jan 2010)
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kirkgas

from United Kingdom

Joined: 26 Dec 2007
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Location: Lanarkshire,
United Kingdom
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PostPosted: Fri Jan 29, 2010 11:01 pm Reply with quote

lilleville wrote:
You really need boss white and hemp on cylinder joints, PTFE is too lightweight! You need to re-do the pipework so it sits comfortably. Its no good forcing the pipes, as matey said, you're asking for trouble. Sometimes the only way through it is through it! Sorry!!


i thought boss white and hemp was banned years ago on all but heating pipes, loctite 55 is the way forward for this type of joint, you can tighten the fitting then back it off if required to line up with fitting, as others have said best to alter pipework rather than strain the cylinder
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1oldspindle

from United Kingdom

Joined: 18 Jan 2010
Posts: 9
Location: Worcestershire,
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PostPosted: Sat Jan 30, 2010 12:37 am Reply with quote

Hold it chaps,,,,,,
Why are any of you struggling with these joints at all.
If the correct cylinder unions were being used you would not have a target position to have to re-set in the first place.
Cylinder unions have a tapered fitting on the end that slightly enters the coil tapping then the nut just tightens onto the thread. No jointing compound on the thread at all. icon_wink.gif
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1oldspindle

from United Kingdom

Joined: 18 Jan 2010
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Location: Worcestershire,
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PostPosted: Sat Jan 30, 2010 1:44 am Reply with quote

bes.com
Cylinder unions.
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Nige F

from United Kingdom

Joined: 28 Jun 2005
Posts: 15954
Location: United Kingdom
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PostPosted: Sat Jan 30, 2010 9:51 am Reply with quote

kirkgas wrote:
lilleville wrote:
You really need boss white and hemp on cylinder joints, PTFE is too lightweight! You need to re-do the pipework so it sits comfortably. Its no good forcing the pipes, as matey said, you're asking for trouble. Sometimes the only way through it is through it! Sorry!!


i thought boss white and hemp was banned years ago on all but heating pipes, loctite 55 is the way forward for this type of joint, you can tighten the fitting then back it off if required to line up with fitting, as others have said best to alter pipework rather than strain the cylinder
Is the coil not a heating pipe icon_wink.gif Locktite, schmocktite icon_rolleyes.gif .If the OP sends me his address, I`ll post him a lock of hemp in an envelope= OR I could start selling it on eBay icon_idea.gif
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