New ball valve fitted to cold water tank - question.

stupot101

keystone wrote: »

It ain't safe if the end of the pipe finds itself below water level thats for sure. But drop the water level then it will probably be fine. I'd be tempted to lop a bit off so that even if the water level does actually rise to the point that it overflows there is no danger of the open end of the vent ever being submerged.

Purely as a matter of interest how high above the water level in the tank is the underside of the topmost part of the vent?

Cheers

I'm not sure what you mean. The end of the vent pipe is about 3mm above the water level. The topmost part of the vent runs along the rafters:

xxxx://commons.wikimedia.org/wiki/File:Cold_water_tank_vent.jpg

Apologies if I'm being thick!

keystone

Canucklehead wrote: »

Vent pipe should terminate 150mm + 40mm per metre of system height, above the water line.

On the basis that the termination is the open end of the vent I don't think thats correct. Surely the 40mm per metre plus 150mm calculation is the correct height for the highest point of the vent above the lowest point in the system. Or have I misunderstood you?

Cheers

stupot101

Canucklehead wrote: »

Hi.

This is what we are supposed to be aiming for......

Correct installation of a cold water cistern

All pipework should be insulated including the open vent and the warning pipe (overflow)

Vent pipe should terminate 150mm + 40mm per metre of system height, above the water line.

GSR.

Yikes, I won't relay the contents of that story to the fiancee. She'd sleep downstairs!

So change to a type 2 valve and increase the clearance of the vent and I should be OK?

southcoastrgi

i always put the highest point of vent normally the bend before it bends down to the tank at 12" above the water level

keystone

stupot101 wrote: »

I'm not sure what you mean. The end of the vent pipe is about 3mm above the water level. The topmost part of the vent runs along the rafters:

xxxx://commons.wikimedia.org/wiki/File:Cold_water_tank_vent.jpg

Apologies if I'm being thick!

No its probably me not explaining myself properly. Its the height difference between the point where the vent makes that sharp bend downwards right up in the roof and the water level in the tank. If your image wasn't so infernally large I'd have annotated it by now and uploaded it again to show what I mean. Be another couple of mins on that methinks with my old steam driven PC.

Edit: Here it is:




Cheers

Canucklehead

Hi.

You need to make sure the vent can't fall out of the clips and dip into the cistern water.

GSR.

southcoastrgi

Canucklehead wrote: »

Hi.

You need to make sure the vent can't fall out of the clips and dip into the cistern water.

GSR.

from that pic it looks too late it doesn't look like it's in the clips anyway

keystone

Canucklehead wrote: »

Hi.

You need to make sure the vent can't fall out of the clips and dip into the cistern water.

GSR.

Any chance you could clear up any potential misunderstanding as highlighted HERE ? Thanks.

Cheers

Canucklehead

keystone wrote: »

Any chance you could clear up any potential misunderstanding as highlighted HERE ? Thanks.

Cheers

Hi.

No. I'm sure you can manage


GSR

keystone

Canucklehead wrote: »

No. I'm sure you can manage

Don't be silly of course I can manage. I wasn't asking for my benefit but you knew that.

Cheers