PRV Correct setting and cons advice

[BobbyJoe]

Hi everyone,

Just wanted some confirmation regarding a PRV fitted to the mains supply in my building. All 6 flats in the building are now connected to the mains water feed supply and the water tanks in the attic have been disconnected (each flat has a combi gas boiler).

My question is the PRV's on the pipes are set at 1.5 bar is that correct they shouldn't be any lower or higher?

What are the benefits of having PRV'S fitted and if they fall below 1.5 bar then what would happen to the water pressure in the flat would it be weaker? Also what would happen if the PRV was set too high what would happen to the water in the flat then?

Thank you for reading and I would be grateful for your advice

 

[John.g]

Is it just one PRV on the mains or separate PRVs to each flat and how high is the highest flat?.

 

[ShaunCorbs]

Evens the pressure out for all the tenants can I ask is there a problem?

 

[BobbyJoe]

Thanks for the reply, from what I can see there are 4 PRVS in total connected to the pipes (could be 6 in total but I just saw 2 prvs on 2 separate pipes on my side of the attic and two on the other side of the attic, I am on the top floor and there are two flats below me.
I would say my flat is around 10 metres high from the ground up. I was the only person in the building connected to the mains water feed for all my water, and recently everyone else got connected. The water pressure is still the same which is good pressure but now I notice when I run my basin mixer tap, the water and temperature fluctuate if my neighbour is using there bathroom tap is this normal?
Also there is no chance of back flow or water mixing since we are now all connected to the mains feed?
Thank you once again

 

[ShaunCorbs]

Yes normal

 

[BobbyJoe]

1.5 bar for all flats pressure is normal?

 

[ShaunCorbs]

Yes you shouldn’t need much more as it’s a flat

 

[BobbyJoe]

If the pressure is too high or too low what happens to the water then?

 

[ShaunCorbs]

You mean if the prv fails

If to low you will notice you can pee faster if to high you could get water hammer or depending on your water pressure pre you could pop joints

 

[BobbyJoe]

Thank you I understand better now. If we are all now using mains water can cross contamination or bacteria occur, for example can the water in my flat mix with my neighbours through the pipes or vice versa? How would I know if water was being mixed?

PRV's and isolation valves are on the water pipes in the attic