blow-off from basement boiler

[nick2312]

I have a new system boiler installed in my basement and cannot vent the PRV blow-off to atmosphere. Can it be connected to the nearest main drain?

 

[Boilerman2]

As long as you fit a Tundish to let you see that the PRV is discharging

 

[bengasman]

Depends on the boiler.

 

[simond]

The PRV outlet should not go uphill.

Reason being, first time it lets go the pipe fills with water which stays there forever and can freeze in the winter.

There are ways round this.

 

[Agile]

Its not totally correct but a common way to deal with the problem is to fit a new PRV on the ground floor with the outlet going to drain at that level.

The system water content is only 80 litres so depoending on the basement if only rough storage it would not be the end of the world if a few litres spilt on the floor. Terminated in a bucket would deal with most system losses in a practical world.

Tony

 

[simond]

We do the above and fit a 2.5bar PRV upstairs to outside, then fit a 150litre compact galvanised cattle drinking trough in the cellar.

Pump House systems now offer a pump suitable for boiler discharge and condensate, just fitted one on an ecoTEC 937 in a basement.

 

[BULKY]

Can't find Pump house systems on the web. Have you got a link or phone number?

 

[ServiceNumpty]

http://www.pumphousepumps.com/GroupInfo.aspx?Id=87

 

[adlplumbing]

other option is tee into the return pipe and fit another on return else where

 

[BULKY]

other option is tee into the return pipe and fit another on return else where

Yeah I was thinking of doing that at the lowest poin t where I can get gravity drainage, and also sticking a large vessel under the PRV on the boiler.

 

[gas112]

If you are fitting a prv elsewhere then the prv at boiler needs teeing into the return

 

[BULKY]

If you are fitting a prv elsewhere then the prv at boiler needs teeing into the return

OK. But in that case it will presumably never discharge, since the pressure will be more or less equal in the return to that in the boiler. Or am I missing something?

 

[picasso]

If you are fitting a prv elsewhere then the prv at boiler needs teeing into the return

OK. But in that case it will presumably never discharge, since the pressure will be more or less equal in the return to that in the boiler. Or am I missing something?

you have to install another prv teed in somewhere more convienient and set at a slightly lower pressure than the original.

 

[BULKY]

If you are fitting a prv elsewhere then the prv at boiler needs teeing into the return

OK. But in that case it will presumably never discharge, since the pressure will be more or less equal in the return to that in the boiler. Or am I missing something?

you have to install another prv teed in somewhere more convienient and set at a slightly lower pressure than the original.

Understood. Is that fully compliant with regs. or grey area?