Unvented cylinder in cellar pressure release valve advise

[RickyLee53]

Hello,

I have a 400l unvented cylinder to go in my cellar. But there seems to be conflict between plumbers/advise.

I have had 2 quotes to fit, and decided to position the cylinder myself. Both agreed this would be best as its a real headache.

However.
Plumber A said.

The discharge has to go outside, in a suitably sized pipe. (10 meters long under living room) with 200mm fall over that distance. As far as I know the regs state continuous fall, which I suppose can be achieved but not easily. It is also a little unsightly and there is no suitable drain outside for it to go into. This would mean more cost afterwards to add something.

Plumber B said the fall isn't great enough/too much hassle and it can vented to a space in the cellar (rubble/soil) under another room. So long as an audible alarm is fitted. 25m^2.

Plumber B's option doesn't seem "correct" but obviously is quote is more favorable, and he seemed the most confident/educated.
I called building control and they didn't really have an answer, and said it depends on what the inspector agrees on.

Plumber B was the guy in the brand new van, plumber A the guy in the 15year old transit.

I spoke to building control and they said as per manufacturers instructions, which obviously don't mention either method.

Regards
Ricky

 

[Dan Robinson]

Get your chosen fitter to contact the manufacturer or fit a pump. .

 

[RickyLee53]

Get your chosen fitter to contact the manufacturer or fit a pump. .

I thought the general consensus was no pumps can handle the heat, unless £1000+, do you have a link to any?

Neither plumbers knew of a pump suitable. I called the manufacturer personally before the plumbers came out to get a better idea and they more or less quoted from the instal book/building reg's.

 

[RickyLee53]

I have just been thinking. Can the Discharge from the cylinder rise before it goes into the Tundish?

If you buy a preplumbed cylinder they just use 1 Tundish for D1 and D2. One of which goes up before it comes down.

If we could go up say 200mm from the discharges, this would allow the Tundish to be installed higher, allowing a greater fall and clearing all obstacles to go with what plumber A suggested.

Logically I cannot see a problem, as it will only be 100mm above the top of the cylinder 0.01bar of pressure, and thats after a 6 bar T and P but you don't know how the inspectors will look at it.

 

[Dan Robinson]

The d3 pipe can not run up.

There is a specialist pump designed for the job.

 

[RickyLee53]

The d3 pipe can not run up.

There is a specialist pump designed for the job.

Do you have a link to the pump? I've seen a few mentioned on the internet but all seem to be in error or misunderstood.

I'm talking about before the Tundish, nothing mentions it, i've seen many of the discharge from the inlet group running up hill. Including manufacturers. I'm guessing its just the T and P, PRV that can't?

D3?

 

[Biggles..]

Dan you ********... What's D3?

Pump house do a pump suitable for starters.

No the tundish can't be above the cylinder .

Lots of ways to discharge it, plumber a and b both have methods, there are many others

 

[Dan Robinson]

Sorry driving and typing.

 

[RickyLee53]

Dan you ********... What's D3?

Pump house do a pump suitable for starters.

No the tundish can't be above the cylinder .

Lots of ways to discharge it, plumber a and b both have methods, there are many others

Hello,

Thanks for the help, that rules the easiest method out then.

Are you saying Method of one of the plumbers to vent inside the cellar area could be ok?

I'll give them a call for some pricing. It looks a little "home made". Something we could knock up at work in notime, but I don't know the legislation required.