Unvented Direct Cylinder........

[Redhotferrari]

Do not know a lot about these, but hot feed pipe comes out of the top as normal, along and to a elbow down to the floor and into the bathroom next door.

The soldered elbow has a leak, not major, but enough to need it fixing!

Can you isolate the cold supply and work on these as normal cylinders? I seem to remember reading that you need to train on these before being allowed!

Not sure what the procedure would be to allow me to cut out the offending joint and replace.

Cheers

 

[hi-spec plumbing heating]

you need a g3 to work on unvented

your not working on the cylinder are you or touching the prv.

just shut the stopcock and change the elbow.

 

[Redhotferrari]

thats what I thought.

Not touching the cylinder, literally need to cut out the elbow and replace so its not leaking!

Assume afterwards I just restore the supply from the stop cock?

 

[hi-spec plumbing heating]

yep done in 15mins

 

[Redhotferrari]

Good man!

 

[Redhotferrari]

Mind you, it will take more than 15mins to remove the damn silver paint on the pipework

 

[Redhotferrari]

Sorry, one more question!

So cutting off the cold supply will obviously stop the hot feed, if I run the hot taps in the house to let any water lying in the pipes, when I cut into the 22mm will I be able to get it dry enough to solder successfully?

Thanks for all your advice

 

[ChrisR]

Mr Sod says that the water will hang in the pipe.
If you lift the pressure relief valve on the side of the cylinder, the water will come out via the tundish or the hot tap.
If for some reason it refuses, simply undo the compression joint on top of the cylinder - or put a hacksaw across the outside of the elbow to let air in!

Expect the hw to run for several minutes after you shut the cw supply off -- you know why ...?

 

[Redhotferrari]

'several minutes'! Assume its due to the pressure.

Would it be best then to isolate the cold, run the hot taps, and hacksaw into the elbow to let air in and wait for the pressure to drop? Not exactly the easiest place to get a bucket under the pipes so need to minimise the water flow when I cut into it!

Cheers