Are you allowed to run a discharge pipe from a cylinder into a soil pipe?

[uwantsome]

as above, cheers

 

[Meady]

I'm pretty sure you are as the company I work for does it on site, but we run high temperature pipe to it straight from the soil and have a hepVo trap (one of the dry traps) connected to the tundish.

 

[plumber0808]

A unvented cylinder yes.

 

[uwantsome]

yes thats what i thought. Ive been running them in on site for ages now. Straight out of the unvented cylinder using a hepvo valve, into inch and a quarter push fit and then connected to a soil pipe. An old guy at my firm says you are not allowed to do this though, he's adamant of it

 

[plumber0808]

It is permitted. Stick it to him

 

[AWheating]

yes but you should only be doing it if there is no possible route to outside. As mentioned it needs to run throught a hepvo valve as detailed in its instructions and i think in the building regs.
You did need to ask LBC permission to route to waste but i think thats changed now. You also need to be able to prove the waste system can take the high temps from such systems.

 

[uwantsome]

well its site work so there is always a route to outside with copper. Most of the houses i do now are 3 story and the cylinders are on the top floor and that would mean taking a copper pipe through each floor and core drilling a hole, thats fine but when the soil pipe is about 4 metres away its easier and at less cost to connect it into a soil pipe. Also a neater job, i just hope what i have been doing is right

 

[AWheating]

ask your local building control or the nhbc inspector. Normally cost should not be a factor in the way the discharge is run tbh.

the waste pipework needs to be of a material (normally pushfit) type capable of a working temp of above 100 degrees i think, have a read of part g.

if its on the drawings as youve fitted it then your covered and i would not worry.

 

[uwantsome]

cheers, yeah it is push fit and the nhbc guy has passed every single house I've done and the site wins awards. obviously the old guy is talking rubbish.

thanks for the replies

 

[plumber0808]

I wouldn't point it out to the NHBC inspector as they are now done. Just incase he did decide to make you change them based on it can go outside. If your 3 floors up with a soil stack 4 meters away its going in there every time.
would save a lot of money on materials and labour.