Working on bath hot water pipe

[dido24]

I changed my bath shower mixer tap in my upstairs bathroom at the weekend but my pipework is imperial three quarter inch and I couldn't stop the tap connector from leaking. The access is really tight so I couldn't get the PTFE tape to the threads despite trying for hours. I spoke to a friend who recommended cutting the pipe down and using a flexi tap connector how stupid was I to take that advice the compression joint to the pipe appears to be ok but when I turn the water back on it still has a very slight leak. I tried PTFE around the olive which worked but then the water very slowly seeped out of the top of the nut. I read this forum changed the olive and bought some LSX. Now the slight leak is back at the olive. I will probably go back to using copper pipe but my problem is that since I cut the pipe there has been water which sits at the top of the cut and if I soak it up the water goes down the pipe for a second then comes back so I have to work with a bath towel and various cloths which become saturated really quickly. This seems like a gravity problem but I don't understand why there is so much water. I have made sure that the hot and cold valves on the cylinder are turned off completely and have left all the hot taps in the house open but it makes no difference. Does this mean that my shut off valve isn't working properly or could something else be going on.

[SimonG]

I honestly think you should bite the bullet and get a plumber in. Post your location, somebody on here may be close enough to help.

[dido24]

Thank you for your reply but I am not in a position to do that. I am quite competent at pipework and changing taps and valves. I just need to understand what is going on with the water in the pipe.

[steveb]

it does sound like your gate valve on the hot side is letting by

[SimonG]

Best of luck.

[Bernie2]

Hmm! Are you using an imperial ring when you connect the metric fitting on to the imperial pipe? I know metric nuts and rings fit on imperial pipe but you have problems with leaks like you seem to be having. Some compression fittings you may have to change the back nut as well.

[Paulus]

Have you opened your downstairs taps to drain off the water retained in the pipes?

[dido24]

Hi, thanks for your reply. I am using a 22mm to 3/4 inch flexible tap connector and the olive is therefore imperial size.

[dido24]

Yes I opened all the hot water taps upstairs and downstairs. Thanks anyway.

[dido24]

Thanks for your reply. I did think that this might be the problem but hoped that it was accumulated water in the pipes somehow being caught in a vacuum and that there might be a solution.

[dido24]

it does sound like your gate valve on the hot side is letting by

Thanks for your reply. I did think that this might be the problem but hoped that it was accumulated water in the pipes somehow being caught in a vacuum and that there might be a solution.

Read more: http://www.ukplumbersforums.co.uk/pl...#ixzz22lRCSR7f (Working on bath hot water pipe)

[JCplumb]

Hi, thanks for your reply. I am using a 22mm to 3/4 inch flexible tap connector and the olive is therefore imperial size.

The olive in a 22mm to 3/4" tap connector is on the 22mm side and therefore not imperial. The 3/4" bit is the part that connects to the tap and has a washer in, not an olive.

[petercj]

Have you opened up any showers on the system - put the shower head in the tray or the bath so that it drains.

Also, have you tried opening and closing the valves several times - gate valves in hard water areas are buggers for letting water pass when they haven't been used for a while.

If you've done all of the above with no success - switch off at the main stopcock and drain the system.

As for the leaking olive, I'd be inclined to start again with a new olive - clean the pipe with some wire wool, make sure the surface is good, and then wack it up tight with a new olive and forget the tape.

If that fails, go for a good quality 3/4" push fit.

[dido24]

The olive in a 22mm to 3/4" tap connector is on the 22mm side and therefore not imperial. The 3/4" bit is the part that connects to the tap and has a washer in, not an olive.

The olive was a very snug fit on the pipe before compression. Once compressed I undid the connector to check that the olive was properly compressed and it was. Thanks anyway

[dido24]

Have you opened up any showers on the system - put the shower head in the tray or the bath so that it drains.

Also, have you tried opening and closing the valves several times - gate valves in hard water areas are buggers for letting water pass when they haven't been used for a while.

If you've done all of the above with no success - switch off at the main stopcock and drain the system.

As for the leaking olive, I'd be inclined to start again with a new olive - clean the pipe with some wire wool, make sure the surface is good, and then wack it up tight with a new olive and forget the tape.

If that fails, go for a good quality 3/4" push fit.

Thanks, I'll give this a try