Water Leak: PVC pipe connection.

two wheels good

I'm trying to solve a leak at my sister's house. After trying various solutions in vain I'm thinking the connection used might not be correct for a mains pressure Poly pipe. See photos.
Should I be using a connection with a barbed/ridged insert jammed into the pipe? Like a garden hose connector - but bigger obviously.

Problem(s) appear to be:
- I need to tighten to squeeze olive closed but then rubber o-ring deforms
- it seems unlikely the face of Poly pipe will seal against brass ring.

Various attempts with and without PTFE tape tried and failed. The o-ring looks okay but has had a deal of abuse now. It seems quite flimsy. Any advice gratefully received.

Edit: Err .. I meant Poly pipe

whizbang

Is the Olive cracked? It doesn't look like a compression olive to me, but it should not have a gap in it.

maybe try the plumbing forum..

Joe1919

I have used them fittings many times and they are considered good. They are especially used with water pumps. PTFE (white tape ) is not used. The fitting is normally not dismantled. The ring is split as shown, its purpose is to grip the pipe only. The seal is between the rubber ring and pipe. The rubber ring goes in first followed by the brass washer, then the split ring and finally the nut.
I would clean off the pipe and check that there is no damage, especially to area that will be in contact with rubber ring. It may be necessary to cut about an inch off the pipe to give a new clean surface if the pipe is damaged.
The rubber rings can also be got.
http://www.epswater.ie/fittings/alkathene-fittings-inserts-bsr.2658.html

PS The fittings and ring are designed for strong polythene pipe and must be the proper fit and match the gauge.

Calahonda52

Joe clearly knows more about this than I.

Did this ever work?
what follows is just looking at the setup.
Get rid of the tape, not required.
The poly should go way down into the fitting so as o ring is well up on the polypipe, as well as the brass washer and the split olive.
Is the poly a snug fit for inside of the pump side fitting: the seal here is the o ring compressed against the poly by the brass ring and the flange in the pump side fitting

two wheels good

Thanks all. Pushing "olive" further back on pipe worth another try.
I have trimmed the pipe end. O-ring and washer correctly installed. PTFE was final clutching at straws.
Will be weekend before another attempt.
(There's aplumbing forum?!)

Alun

two wheels good wrote: »

(There's aplumbing forum?!)

http://www.boards.ie/vbulletin/forumdisplay.php?f=1320

Joe1919

two wheels good wrote: »

.... Pushing "olive" further back on pipe worth another try........

Just to explain about these fittings. They have an extremely strong grip on the pipe. They are designed for use in situations such as on heavy submersible pumps in deep wells where mechanical strength and ability to take high pressure is important. Hence the split collar has a good grip but this can prevent the pipe from going in far enough, so its important to make sure that the nut is loose and the pipe is pushed in fully into the fitting before tightening.

two wheels good

Success! Rubber seal resting and "plumping-up" for a week; I moved the "olive" as far up the pipe as threads on nut would allow and didn't overdo the torque when tightening. All still good three days later.

I also managed to adjust the level in an awkward enclosed toilet cistern. My sister thinks I'm a natural-born plumber.

Thanks v much for responses and advice.