Unvented cylinder discharge pipe

[kay-jay]

There's no point in having a tundish if it isn't sited where it can be seen. The point is so that the discharge is apparent. Having said that, I've been to customers with BG contracts and the BG engineers haven't bothered to check the discharge pipe outside when a loss of system pressure has been reported.

i agree that the tundish should be sited where discharge will be seen, however the main point of the tundish is to provide an airgap to prevent backflow. what would happen if someone didn't observe the g3 regs and the bend on the discharge was too close to the valve causing discharge to slow up to the point the tank still exploded...............the tundish provides egress for expanding 100 plus degree steam in emergency situations in which a baddly fitted pipe causes a hinderance.

KJ

 

[Toddyplumb]

And what is the tundish made of on most unvented cylinders ...........plastic.

 

[Peshi]

Want to use the HEPvo but need to know if possible.

I have already solvent welded a boss adapter to stack. Can this be used or how do i get it out to change to rubber one? Already plastered and boxed in so limited space.

Also need to connect small basin and washing machine into the same pipe. I know the instruction said you need separate pipe just in case of blockage, I could run another pipe along the wall and tee in right next to boss adapter.
Is that possible?

Info: (new build, 150ltr or 180ltr tank)
Total pipe run from util area to stack is only 2m, hot tank next to washing machine then wc to stack. (no drain out side to discharge to)

If cant do above will have to go back to original plan and use Gledhill Pulsacoil (allot more money)

 

[tamz]

If you are running the discharge pipe in plastic it must be done in high temp plastics (polypropylene) and cannot have anything else using the same pipe.
You will need to put another strap on boss onto the stack to take the basin and washing machine.

 

[oldplumber]

you can only follow the MIs that the cyl comes with and if they are not updated how can you do something different, if there was an insurance issue later on I bet I know who would be the patsey and it will all fall down hill onto the installer.

 

[kirkgas]

As far as I am aware kirkgas the MI's for most cylinders and my own training state to comply with building reg. G3:
"ensure the discharge from any safety device is conveyed to where it is visible"

Ideally but not the only option is discharging between 70-100mm from ground into a drain.

Only if there is no other reasonable option alternative arrangements may be carried out for the discharge termination. In my opinion lifting a few boards would not be classed as a reason not to comply with the above.

bpec training notes say EITHER the tundish or the termination point MUST be visible

 

[kirkgas]

GrahamM has a point. If no-one knows that the regs have changed or altered and even the Cylinder MI does not include the fact that you can now dishcharge into a soil stack. Something is massively wrong with our training/systems etc etc.
Must admit I didn't know that you can now discharge UV into a soil stack with HEP2o stuff. Now I know why I must have lost a job a couple of weeks ago. You live and learn!

with all due respect to all those who are damn busy doing a fine job day in day out, but it is the duty of the responsible person for the company to ensure all working practices meet current standards, whether that is a massive construction company or self employed, the info is out there, it is the same with gas regs that change, it amazes me the number of guys coming in for re-assessment who dont know about FSD's for appliances in multi occupancy dwellings, and that has been out for yrs, the latest edition of unvented training has all this info in it, ok you trained 4yrs ago and are not due to come back till next yr but you may be working to the old standards and costing yourself time and money or actually losing a job by not knowing you can now do something sa different way, ie terminate unvented via the hep2o

 

[pauls]

before i got to page 2 i was saying to myself soil pipe not a problem tundish in a visible position will show discharge.

 

[markproperjob]

it is definitely perfectly acceptable to vent into the soil stack, new build townhouse apartments do it all the time!!
but you MUST incorporate a VISABLE/AUDABLE WARNING to indicate all is not well... this can take the form of an external vent pipe chucking water down the wall, or in your case, a correct-for-purpose tun dish built into the discharge pipework to provide this warning.
WRAS regs.

 

[tamz]

it amazes me the number of guys coming in for re-assessment who dont know about FSD's for appliances in multi occupancy dwellings

What is a multi occupancy dwelling? Is that one of these student hives places🙂😀

 

[vaughan]

My home work from college week before last, was to learn the building regs g3 doc that we was given (this was the old doc) which I did; and this week we have been given the new building regs part g doc and have to find out whats new and whats changed .

 

[tamz]

Well take it to bed and have a read through it in fact read both, or would you like me to tell you so that you can get a good sleep?

 

[vaughan]

Its a very good read and helps if you suffer from sleepless nights.

 

[payney1974]

The key is to have the tundish so the discharge can be seen...

Thats what i thought

 

[buckley plumb]

Thank you all. In the event the joists went the right way and they have put the discharge externally without too much trouble. My brother in law works for the NHBC and one of his top guys didn't know the up to date rule about discharge pipes into stacks so it is clearly a complex subject.

what pipe and fittings was correct was it pushfit