PRV outlet pipe: recommended fitting practice?
Posted 30 October 2013 - 07:55 AM
Posted 30 October 2013 - 08:25 AM
If the pipe is the condensate drain then it should either run to the drainage system or run down the wall to a small soakaway lined with limestone chippings (because the condensate from a boiler is slightly acidic and is best neutralised with something like limestone).
From your description this sounds as if it's the pressure relief pipe, and the plumber is right, it shouldn't point outwards like an overflow from a cistern or water tank, it should run downwards, although it shouldn't really be pointed at a wall it should point down at the ground. As this is on a flat above you then the pipe should run down the wall to a safe discharge point just above ground level, as quite apart from the water damage risk you've encountered, a high level discharge of scalding water is a potential hazard to anyone passing underneath it.
Edited by jsharris, 30 October 2013 - 08:26 AM.
Posted 30 October 2013 - 08:26 AM
I have more concerns though:
Why is the wall not waterproof? unless it's an old solid brick wall, water should not get through.
Why is the pipe venting so often?
Why does it discharge so high above ground level? would it not be better to extend it down your wall to vent it lower?
Is this a metal or plastic pipe?
Posted 30 October 2013 - 08:38 AM
So, from that there's no requirement for it to face a wall but there is a requirement to ensure that the discharge cannot cause harm or damage.
Posted 30 October 2013 - 08:43 AM
1) Discharge pipe from a sealed system boiler (such as a combination boiler). In this case the pipe can come through the wall and turn 90°. Although any water discharged from tis pipe will be hot the volume will amount to less than a cupful.
2) Discharge pipe from an un-vented mains pressure cylinder. The water from such a discharge can be at 90°C plus and can run continuously. There are a number of options for routing the pipework all requiring a safe discharge point. In this case the pipe must be bent back towards the wall.
3) Overflow from header tank. No need for the pipe to be bent back to the wall.
4) Other overflow again no need for the pipe to be bent back to the wall.
As the plumber has suggested that the pipe must be bent back to the wall then it is likely that the discharge is from a cylinder rather than a boiler.
Posted 30 October 2013 - 08:58 AM
Who paid for the damage? If you claimed on the neighbours insurance I would write to them and point out that this is a safety risk and ask them to consider sorting it to avoid a future more serious claim.
Posted 30 October 2013 - 05:01 PM
The only problem with this post is the porous nature if your wall!!! How can water get in so freely? Time to get your pointing sorted out as that is the ONLY problem here ( unless the discharge pipe is DIRECTLY above an opening window or door then you can ask for it to be moved as its against manufacturers installation guidelines ).
Edited by joiner, 02 November 2013 - 03:03 PM.
Posted 30 October 2013 - 05:05 PM
Posted 30 October 2013 - 08:15 PM
Take your point about the filling loop being left open, should not happen as filling loops should be disconnected but we know that does not always/often happen.
Posted 30 October 2013 - 08:38 PM
( Point for this post stays the same for me though, POINT YOUR BRICKWORK. nothing wrong with boiler install up stairs I'm afraid. )
Posted 02 November 2013 - 07:42 AM
Posted 02 November 2013 - 08:36 AM
Edited by jsharris, 02 November 2013 - 08:36 AM.
Posted 02 November 2013 - 08:41 AM
Posted 02 November 2013 - 05:57 PM
Does the pipe discharge directly over a window?
Posted 03 November 2013 - 06:26 AM
Posted 03 November 2013 - 03:39 PM
Posted 03 November 2013 - 03:54 PM
Posted 03 November 2013 - 03:56 PM
Posted 04 November 2013 - 09:08 AM
You have to have a tundish with an un-vented cylinder within site of the cylinder (Building Regs part G3 Section 3 diagram 1). Not required with a boiler as you have said.
Posted 04 November 2013 - 10:06 PM
Tundishes can be used on boilers in extraordinary circumstances, but its most definitely not the norm.
Just done a conversion of a nursing home into 6 self contained flats which had long discharge pipe runs but I made sure they all terminated just either side of the main entrance door to be sure any water run off would be visible to all.
I increased the pipe to suit and didn't bother with tundishes as tenants probably would just think it was a nice water feature, whereas the outside pipes could be checked by the landlord/agent easily.
All unvented cylinders I have fitted, come with the correct tundish supplied as standard.