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Compression Joints


 
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telsokari

from United Kingdom

Joined: 19 Feb 2010
Posts: 14
Location: London,
United Kingdom

PostPosted: Mon Oct 31, 2011 10:00 am Reply with quote

Hi there,

Was undertaking some plumbing work over the weekend and have found that one of my compression fittings is leaky no matter how much i tighten it.

i have a flexi pipe coming from the original copper pipe connected to a smaller copper pipe which then fits to the tap connector. its those last two compression fittings that are leaking.

Is it possible to remove the middle shorter copper pipe and use something like this to connect the two flexi pipes together

http://www.diy.com/diy/jsp/bq/nav.jsp?action=detail&fh_secondid=11477773&fh_location=//catalog01/en_GB/categories%3C{9372015}/categories%3C{9372046}/categories%3C{9372180}/specificationsProductType=central_heating_fittings/specificationsSpecificProductType=sockets

also, this says its size is 19mm, does that mean the outer socket size is 19mm but would work well for the 15mm flexi male or is this for a 19mm pipe?

i'm its not ideal to have the two flexi hoses together but it was all i could and it was my first ever time pluming

Thanks

T
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Darren1234

from United Kingdom

Joined: 29 Aug 2010
Posts: 22
Location: United Kingdom

PostPosted: Mon Oct 31, 2011 6:23 pm Reply with quote

As you said 'Both' are leaking are you missing a washer or something from each connection?
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danplumb

from United Kingdom

Joined: 30 Mar 2011
Posts: 111
Location: Manchester,
United Kingdom
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PostPosted: Wed Nov 02, 2011 12:33 am Reply with quote

Not so much a disaster so would of been better posting in plumbing and heating, But just undo your fittings again and apply a couple of turns of PTFE on the olives then retighten, should solve your problem.
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jadzy

from United Kingdom

Joined: 23 Jan 2009
Posts: 42
Location: Suffolk,
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PostPosted: Sun Dec 04, 2011 8:18 pm Reply with quote

don't over tighten your compression joint. that'll make it leak too. i always coat the inside of mine with boss green jointing compound.
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croydoncorgi

from United Kingdom

Joined: 06 Jun 2004
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Location: London,
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PostPosted: Wed Dec 14, 2011 2:44 pm Reply with quote

[Yawn]

Why is it that no-one reads the instructions and data-sheets carefully prepared by makers of compression joints such as Conex and Kuterlite?

I think it's correct that ALL specify that joints under 42mm should be assembled without any additional sealants. Mineral oil lubricant only.

If you follow the assembly instructions and the joint components match (ie. are all the same size!), they will be watertight. End of.

And especially if you start decorating your joint with PTFE tape, it may not leak immediately but probably will later. Worse, because it seemed tight when it maybe wasn't, you run the risk of the whole joint coming off the pipe, with disastrous results.

Do what the manufacturers specify and even if a joint does fail, most of them in fact include an automatic warranty against failure of a properly-made joint. If you choose to do different, you're on your own! Even your insurance will be invalidated by your 'negligence'.
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skotl (2 Jan 2012)
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handyman77

from United Kingdom

Joined: 08 Nov 2011
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Location: London,
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PostPosted: Thu Dec 15, 2011 7:00 am Reply with quote

Depending on how old your pipework is it could be an imperial size pipe 1/2 inch rather than 15mm, you can get imperial olives from a plumbers merchants. icon_cool.gif
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mattylad

from United Kingdom

Joined: 26 Apr 2008
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PostPosted: Thu Dec 15, 2011 8:09 am Reply with quote

croydoncorgi wrote:

Why is it that no-one reads the instructions and data-sheets carefully prepared by makers of compression joints such as Conex and Kuterlite?


Perhaps because in 30 years of DIY I have never ever - ever been given any form of instruction/data sheet when purchasing compression joints from a plumbers supply shop, so I suspect the same is of the OP.


I am afraid that you are off your rocker if you think this information comes as standard when purchasing compression joints.
icon_lol.gif
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jadzy

from United Kingdom

Joined: 23 Jan 2009
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Location: Suffolk,
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PostPosted: Thu Dec 15, 2011 8:26 am Reply with quote

was thinking similar... never seen an instruction with a compression joint. obviously buying ones that aren't posh enough :p
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mivy2006

from United Kingdom

Joined: 30 Dec 2011
Posts: 40
Location: Gwent,
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PostPosted: Fri Dec 30, 2011 8:37 pm Reply with quote

As mentioned above, if you have over tightened this will cause the leak, the olive will be crushed if you have done this as a result... remove olives with pref olive puller if you have one, or very carefully with hacksaw (dont damage pipe, if you do damage pipe cut of damaged section) and use new olives, tighten up then do 1/4 of turn more, turn back on water, tighten tiny bit more if required... If they on hot feed, they most likely to leak when cold, so check for leaks when cold.....
If you really not having any luck, try the old "speed fit", which hard to do wrong, but cost more.....
Good luck!
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conny

from United Kingdom

Joined: 30 Jun 2008
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Location: Liverpool,
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PostPosted: Sun Jan 01, 2012 11:44 pm Reply with quote

mivy2006 wrote:
As mentioned above, if you have over tightened this will cause the leak, the olive will be crushed if you have done this as a result... remove olives with pref olive puller if you have one, or very carefully with hacksaw (dont damage pipe, if you do damage pipe cut of damaged section) and use new olives, tighten up then do 1/4 of turn more, turn back on water, tighten tiny bit more if required... If they on hot feed, they most likely to leak when cold, so check for leaks when cold.....
If you really not having any luck, try the old "speed fit", which hard to do wrong, but cost more.....
Good luck!

If you use the speedi fit make sure you twist the locking collar fully. Otherwise you have done it wrong!
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