Water dripping through Tundish after 2 PRV replacements

[Dangee]

When water heats up, it expands by about 4% (I think). The pressure vessel allows this to happen as you can’t compress water. It’s a pocket of compressed air. When under no water pressure, the air inside should be pumped up to 3bar via the valve on the top. I would get a qualified engineer to check things over to be honest. If you put your postcode into the GasSafe register it will show nearby people but you have to check if they have the unvented cylinders or G3 element listed on their page.
Unvented cylinders are potentially explosive as you can’t compress water as it expands.

 

[Alex Burton]

Thanks for all the help, I gave someone a call who said it’s likely when they replaced the PRV the expansion vessel was not charged. He’s popping round tonight to sort it out. Got his details off check a trade and is all G3 registered.

 

[ianmcd]

Sounds like it’s full to me. I tried to upload a video but appears the forums don’t allow videos

upload your video to youtube the post the link on here

 

[ianmcd]

If you put your postcode into the GasSafe register it will show nearby people but you have to check if they have the unvented cylinders or G3 element

Engineers or plumbers can hold G3 qualis without it showing on the Gas safe register

 

[Gasguru]

If he's G3 why would he not bring the expansion safety valve plumbing up to standard...and why would anyone replace the pressure reducing valve and not check the vessel.
This all looks distinctly diy....

 

[Deleted member 267285]

which part is that? the braided silver pipe with the 2 black taps?

Yes that’s the one.

 

[Dangee]

There are many many “whys” with that airing cupboard.

 

[ianmcd]

I agree with @Chris_W first thing to do is check that valve

 

[Alex Burton]

The expansion vessel had no pressure at all for a start but the Prv also need replacing. Not major at the moment thankfully but will get it replaced as soon as poss