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Post by ken778 on May 25, 2016 22:22:21 GMT
I read that if you make up a new compression fitting with ptfe round the olive, the fitting can initially be watertight but can blow off at a later time!  Is that actually true? Have you guys ever seen that happen? I had a leak under the bath, solder joint on 15mm to the cold tap (mains pressure) was weeping. I managed to replace the pipe with new copper and fit a new tap connector, all compression fittings. Been watertight for a couple of days now. I didn't want any leaks (as it's a total pain to work under the bath!  ) so I wrapped some ptfe round all the olives in my new fittings. Gave em the usual 1/4 turn and all seems ok, but do I need to go back and replace them!? Thanks in advance!  |
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Post by jcplumb on May 26, 2016 1:20:52 GMT
Never used prfe or paste on new compression fittings, some do, some don't. I do use it if I'm re-using a fitting or part of a fitting though. Apparantly if you don't use anything the joint can weep a teeny weeny bit, never been an issue for me though as far as I know. You just get used to how tight they need to be, also I use copper olives whenever I can. There's another school of thought that you should always use brass olives on hot, but I think it's a load of pish They'll be reyt mate, don't worry about them. |
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Post by pipeslice on May 26, 2016 9:37:28 GMT
The most common problem with using compression fittings is movement of the pipe work , if you have badly fitted pipes that move about when you open a tap any compression fitting will leak , if this is the case you would be better to use some push fit fittings such as speedfit or Hep , failing this try to secure the pipes as best you can using cable ties to try and prevent them moving around , if on the other hand your pipes are securely fixed then you will not have anything to worry about and using a bit of teflon tape won't do any harm although it's not really needed.....  |
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Post by tomplum on May 26, 2016 15:15:28 GMT
I went on a course provided by conex in the 1980's their take on this was, screw the nut up hand tight then give a quarter turn with a spanner and that's enough, no need for tape or paste, thats all fine and well on conex fittings ( considered quality stuff) and yorkshire or wedsbury pipe, but some of the shite fittings and pipe about today its worthwhile using a bit of paste, I never use ptfe on compression, |
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Post by rocketmanbkk on May 26, 2016 16:34:24 GMT
Talking of compression fittings
I've used ISO that are not Wras & then bought wras ones. More expensive but sealed do easily, didn't need to use any muscle.
Any opinions?
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Post by tomplum on May 26, 2016 17:44:19 GMT
same old thing rocketman, you only get what you pay for,, |
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Post by rocketmanbkk on May 26, 2016 19:53:26 GMT
The wras ones were unbelievable & so easy to seal
I'll never use a cheapie again
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Post by ken778 on May 26, 2016 21:26:04 GMT
Thanks for the advice guys! Glad to know ptfe tape won't actually do any harm. But if I need to use any more compression fittings in the future I'll get some paste. Good point about movement in the pipe work, I've made sure the taps are tight on the bath so the pipes/fittings shouldn't be moving at all. |
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Post by tomplum on May 26, 2016 21:36:00 GMT
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Post by chelsearob on May 28, 2016 11:50:49 GMT
Little bit of paste and copper olive, does for me every time. PS lovely macerator job today....... Nice _t4MrEZkt3xFthuI5pxo
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) so I wrapped some ptfe round all the olives in my new fittings. Gave em the usual 1/4 turn and all seems ok, but do I need to go back and replace them!?
