Pressure relief valve

[mickeyuk]

Hallo just after some advice and your thoughts on this one. Yesterday went to service a condensing combi and i have to say it was a very good installation in a flat above a shop . However they have run the prv pipe into the internal vent stack just above the condensate pipe is this a no no or is it ok .It would be a nightmare to change and run external with the shop front windows and doors etc .What do you think ?

 

[mikegas]

its not allowed, ive seen a few discharge into 1.5" waste under kitchen sinks

 

[mickeyuk]

Thanks mike would you say this was a safety issue and if it is why ?

 

[Barry98]

yes , you need to be able to see when it discharges

 

[mickeyuk]

Thanks Bod although i personally would think it would be safer to discharge the boiler contents internally rather than outside and after all you would be looking at the pressure gauge to tell you its discharged

 

[Gray0689]

Thanks Bod although i personally would think it would be safer to discharge the boiler contents internally rather than outside and after all you would be looking at the pressure gauge to tell you its discharged

If you can't change it put a tundish in

 

[cdodds2004]

agreed its not acceptable!

 

[mickeyuk]

Hi Gray so the regs state it has to be a visible discharge thanks !!

 

[Gray0689]

What I'm saying is if you can't change it put a tundish in so
It's visible but it's still not right

 

[mickeyuk]

Thanks Gray for your reply.Would this be NCS or AR in your opinion ? thanks !!

 

[Rossi46]

Atag specify this method. Ncs at worst.

 

[Gray0689]

NCS as said nothing more

 

[mickeyuk]

Why do they say that! just curious.

 

[gaspastemania]

Well i worked on a site where about 150 prv's were terminated internal into a hepvo dry trap, building control passed it and gas safe inspected a few of us on that job and they never mentioned it ,and on recently enquiring about enquiring about a prv discharge to gas safe they refered it to more building control than a gas safe issue.

Whilst on this subject i have a prv to discharge where if i go out through wall it will terminate over =the neighbours slate roof , turning it back will be issue as will have to erect ladder in neighbours garden then get roof ladder to get up on the neighbours roof .What does anyone think about just letting it blow out onto roof and letting it run down tiles into gutter??

 

[Barry98]

id ask permission from neighbour and double it back , i wouldnt let it go straight out. IMO

 

[dontknowitall]

This is the trouble with these regulations. Those who set them in concrete:

a) Never have the brains to work out what to do when circumstances dictate otherwise
b) Pass the buck as soon as there's a tricky installation
c) Pass the buck on to the lowest common denominator (the poor old plumber who's doing the work on the lowest wage of the whole building scheme)

 

[Gray0689]

Well i worked on a site where about 150 prv's were terminated internal into a hepvo dry trap, building control passed it and gas safe inspected a few of us on that job and they never mentioned it ,and on recently enquiring about enquiring about a prv discharge to gas safe they refered it to more building control than a gas safe issue.

Whilst on this subject i have a prv to discharge where if i go out through wall it will terminate over =the neighbours slate roof , turning it back will be issue as will have to erect ladder in neighbours garden then get roof ladder to get up on the neighbours roof .What does anyone think about just letting it blow out onto roof and letting it run down tiles into gutter??

If you have no other way to do it I would drill a bigger hole and solder on a small street 90'and push through so if it blows off it will
Be pointing down at least

 

[mikegas]

Well i worked on a site where about 150 prv's were terminated internal into a hepvo dry trap, building control passed it and gas safe inspected a few of us on that job and they never mentioned it ,and on recently enquiring about enquiring about a prv discharge to gas safe they refered it to more building control than a gas safe issue.

Whilst on this subject i have a prv to discharge where if i go out through wall it will terminate over =the neighbours slate roof , turning it back will be issue as will have to erect ladder in neighbours garden then get roof ladder to get up on the neighbours roof .What does anyone think about just letting it blow out onto roof and letting it run down tiles into gutter??

could fit one of these Central Heating Sealed System Equipment

 

[Gray0689]

could fit one of these Central Heating Sealed System Equipment

Never saw one of those before looks like could do the job but might to a bit restrictive and not let it out quick enough

 

[GrahamM]

Unless the manufacturer specifically states otherwise, the discharge pipe must be metallic and terminate in a visible, safe, position. Simple as that. If this must be out of site such as onto a roof then that cannot be helped. You will have done everything to reasonably comply with the regs/standards.

Never saw one of those before looks like could do the job but might to a bit restrictive and not let it out quick enough

Quite a few of these fitted around the place now. Would not say they are restrictive the holes that channel the discharge onto the cowel are big enough. It does the job and does look a bit neater.

 

[Gray0689]

Quite a few of these fitted around the place now. Would not say they are restrictive the holes that channel the discharge onto the cowel are big enough. It does the job and does look a bit neater.[/QUOTE]
Good to know thank you