Vented Hot Water Cylinder

[Invisible-Man]

Hi,
Could anyone tel me how important the run of the 22mm vented pipe up to the cold water storage tank in the loft is, the vent would be running from the top of a Surrey Flange as the hot is pump fed.

What I really needed to know was, is it important for the 22mm vent pipe to be run as straight as possible up to top of the cold water storage tank, or does it not have any great difference, it would be run vertical or at a 45 degree initially from the airing cupboard but once in the loft it would run horizontal for a bit.

Hope this makes sense

Many thanks

 

[lkuya]

would combining your cold feed and open vent beat any horizontal runs?


and how far is abit?

 

[seco services]

would combining your cold feed and open vent beat any horizontal runs?


and how far is abit?

he's talking about the cylinder vent

 

[LUNAT]

HI

due to the pipe size which is 22mm it does not matter if you use elbows or run the pipe horizontal.
although best way to do is to avoid unnecessary elbows

 

[Invisible-Man]

HI

due to the pipe size which is 22mm it does not matter if you use elbows or run the pipe horizontal.
although best way to do is to avoid unnecessary elbows

Hi, thanks for that, I was not sure that if it were not run vertical within reason, it may aid sucking in air at the pump.

In the loft I will try and use a 45 degree angle as much as possible rather than 90 degree horizontal.

Many thanks

 

[Kes]

As it is a combined vent and expansion pipe it should be run so that any air, and indeed any water that is pushed or blown out of the h/w cylinder, can freely pass up through the pipe and out over the feed tank. Vertical is best, 45 deg OK, horizontal a no-no. Trapped air will cause noise and possibly a violent discharge of hot fluid (just like an evening in A&E).

 

[holty]

as you come off the surrey flange dont go straight up as this would cause one pipe circulation, instead a recommended measurement is 450mm min horizontal off the cylinder with a steady rise. then straight up.