Discharging d2 into soil stack

[plumb_know]

Hello again everyone,I know you can install the d2 pipe work discharging into soil stack via a hepvo valve either in copper or polypropylene pipe work clipped every 300mm, the issue I am checking is that the cylinder I will be installing is only 45cm away from stack and I have not found any information stating if there is a minimum distance you can discharge d2 into plastic soil stack. I am just concerned about potential water temperature distorting soil stack if it was to discharge. I know you have to allow 3metres into guttering.Advice welcomed. Thanks

 

[AWheating]

the distance is fine, you just need to prove the stack can take temps of 99degrees.

 

[plumb_know]

Cheers AWheating,

its just a grey soil pipe? I guess I will have to try and find product number usually printed on the pipe and look it up on internet then to find its heat properties.

Thanks again

 

[Reg Man]

Contentious issue, some local authorities interpret the building regs to allow this, others don't.

 

[kris]

Soil pipe temps vary from manufacturer to manufacturer but they are usually around the 80° Max temp average.

 

[chris watkins]

I have alway taken the opinion that as AD Part G only states that -

"The discharge pipe should not be connected to a soil discharge stack unless it can be demonstrated that the soil discharge stack is capable of safely withstanding temperatures of the water discharged"
In practice how the hell are we to do that if it is a boxed in existing one?

So as long as the stack is all vertical, vented (No Durgo's), has other fittings discharging into it & is well supported, it will withstand intermittent discharge of water at 90-95 deg C. (IMHO)

I am therefore comfortable making a connection to it what ever the material (S/W or push fit).

Just a reminder to all, that this type of discharge connection is only to be used if there is no other sensible cost option available.

 

[plumb_know]

Thanks for advice

 

[townfanjon]

A long time ago when i subbied for kingspan. ( tribune ) i went to a site and saw a totaly distroyed soil stack by a dischargeing unvented. Ok , it might have been the cheapest soil pipe on the market but it was one hell of a mess.
I would try my best not to discharge into one , ever !!

 

[AWheating]

i would worry about a discharge into a floplast svp, but a polypipe, osma etc.... should be ok. you can download data sheets from Manu websites for there current ranges.

As chris said it should only ever run to waste if normal routes are a no go.

 

[Reg Man]

The D2 should be metal, if not it must be of a product capable of with standing the temperature and be clearly marked with the product standard for temperature. Most plastic soil and waste systems do not meet the requirements.

 

[sheff paul]

The D2 should be metal, if not it must be of a product capable of with standing the temperature and be clearly marked with the product standard for temperature. Most plastic soil and waste systems do not meet the requirements.

Reg man I thought osma push fit was ok on D2 ,but not solvent weld of any type.

 

[SJB]

Reg man I thought osma push fit was ok on D2 ,but not solvent weld of any type.

when I first took my unvented in 2007 it 100% had to be metal pipe work for a discharge, can't remember it coming up when I renewed it so I assume that's still the case

 

[sheff paul]

when I first took my unvented in 2007 it 100% had to be metal pipe work for a discharge, can't remember it coming up when I renewed it so I assume that's still the case

Retook mine in March rules have changed regarding plastics

 

[Reg Man]

Reg man I thought osma push fit was ok on D2 ,but not solvent weld of any type.

You may be write, but not everything is osma.

 

[lame plumber]

certainly changed since 2007, came up at my last renewal