Working on bath hot water pipe

[kirkgas]

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

i think the label on the flexi is confusing you, 22mmx 3/4" will refer to pipe size as 22mm and female end for the tap as 3/4"
so as you are competant with pipework what you need is to dump the flexi, and buy a 22mm compression straight coupling, a 22mm x 3/4" olive (which goes onto the old pipe instead of the one in the coupling) then get a 3/4" x 22mm tap adaptor and a small cutting of pipe, you could use the flexi but they are mince, haha, the tap adaptor comes with a fibre washer but some are not great and i do tend to use ptfe tape as well, a wee tip to put ptfe on an inside bath tap is to get a pencil and wrap some ptfe tape round it, then you can unwrap the ptfe onto the tap by turning the pencil round and round the tap ( guff description to be honest but try it and you will see what i mean)

 

[petercj]

If the OP is going to remove the flexi and use ptfe, he just as well use the original pipe-work and make the one joint.

 

[REDSAW]

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.

sounds like it!.

unless you live in london? for £40 best getting someone in as there may be problems later on.

otherwise, slap a push-fit to 3/4 flexi on it...

 

[Best]

Yes, to be honest, you are obviously well out of your depth. A proper 3/4" olive (better a heavy type) will seal no bother at all. If you used a 22mm olive, as it seems, then danger of it twisting on pipe & as said, if it's a copper olive, it can be crushed flat if overtightened. I would recommend paste also.
Water in the pipe is usually a valve passing, so either bung the c/w tank or drain all. I would add that a classic mistake for a diyer is to try to work at hot pipe when an immersion heater or boiler is heating the hot tank at same time & keeps expanding the water into the hot pipe!

 

[dido24]

Update
I replaced the gate valve on the hot water supply pipe which cured the water problem.

I then bought some imperial olives, used LSX above the olive and on the tap connector thread just to make sure. It's been two weeks and it's all dry as a bone!

Thanks very much to all of you who posted helpful suggestions - I really appreciate your advice.

 

[Barry98]

Dido are we to assume someone offended you but you putting helpful in bold ?

 

[mountainman]

School holidays are almost over!
Thank goodness.

 

[frankjames]

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.

This sounds like it could be it get and imperial olive,
good luck