PRV Termination

[raffuk]

On a condensing boiler is there anything wrong with terminating the copper prv pipe into plastic soil pipe. Both Condensing pipe and PRV have been terminated at nearby soil pipe.

 

[dancinplumba]

yes its wrong there isnt a visual way of checking that prv is blowing off

 

[PlumbBobBob]

you have to visually see if the prv is passing as dancinplumba said

 

[raffuk]

Thanks guys. If it did blow out, does it blow at a temperature that could melt part of the plastic soil pipe? Is it worth calling back the plumber to correct it, installation was done 3 weeks ago

 

[ecowarm]

It could pass through a visible tundish on the inside if no other option maybe

 

[dancinplumba]

Thanks guys. If it did blow out, does it blow at a temperature that could melt part of the plastic soil pipe? Is it worth calling back the plumber to correct it, installation was done 3 weeks ago

as eco says but requires a trap after tundish. do you have any pictures you can upload, carnt understand why your "plumber" has done this ?

 

[AWheating]

would be best to put a tundish and hepvo valve in and use push fit not solvent waste.

 

[kirkgas]

would be best to put a tundish and hepvo valve in and use push fit not solvent waste.

im not doubting what you are saying, but why cant you use solvent for blow off, it is designed for use as sink wastes and quite often boiling water gets put down there

 

[dancinplumba]

would be best to put a tundish and hepvo valve in and use push fit not solvent waste.

edited

 

[tweakyboy]

You can't use ABS solvent weld for high temperature blow offs, I know Osma's push fit range is suitable for high temperatures. Any waste pipe/fittings taking high temperatures must comply to BS 5254 or BS EN 1451 also it must be clipped at maximum 300mm apart!

 

[dancinplumba]

lol shouting at me, i stand corrected

 

[gas-mark]

if PRV terminates in a soil stack woulnt it be NCS, i was told soil stacks coulnt hold that temp? sorry if Dumb question

 

[AWheating]

im not doubting what you are saying, but why cant you use solvent for blow off, it is designed for use as sink wastes and quite often boiling water gets put down there

i know what your saying Kirk, im just going on whats required for unvented discharges and thinks its advisable to stick to these rules for any prv. Building control requires you to use a waste system that can withstand a constant temp above 100*c, most solvent weld systems are not rated at above this temp.

 

[AWheating]

if PRV terminates in a soil stack woulnt it be NCS, i was told soil stacks coulnt hold that temp? sorry if Dumb question

NCS is relevant to gas regs/fittings so would a incorrectly installed discharge pipe be a gas related issue? as its not part of the gas regs but possibly under the building regs.

 

[GrahamM]

As mentioned, if the Manufacturer confirms a tundish set up may be used, you then have to confirm the drainage set-up is capable of withstanding the temperatures of the discharge as the Standards state the PRV discharge should be metallic pipe.

My first course of action would be to enquire as to wither a remote PRV can be put in anywhere discharging to outside as per standard.

 

[AWheating]

im unsure if its relevant to non unvented discharges but with unvented systems you normally need written permission off building control before being able to install into a waste system. not sure if its the case with a combi/system prv tho?

 

[Simon F]

On a condensing boiler is there anything wrong with terminating the copper prv pipe into plastic soil pipe. Both Condensing pipe and PRV have been terminated at nearby soil pipe.

is the soil pipe internal or external?
is there some reason why the prv pipe can't be through the wall as usual?
BS 6798:2009 go into detail about the position of the condense pipe
check what the manufacturers instructions say about the termination for both pipes.

 

[gas-mark]

if it was a combi it would be classed as NCS?

 

[AWheating]

if it was a combi it would be classed as NCS?

as i mentioned above, i believe its a building reg not a gas regs so i would say no its not NCS.