F and e tank question

[jitenbulsara]

Just wondered if anyone has worked on a back boiler and the f&e tank has backed up from the feed and not from faulty ball valve or filling up from expansion pipe ?..

 

[Last Plumber]

Not clear what you're asking ?

 

[jitenbulsara]

The vent pipe is for the expansion but is there a chance water can be pushed up from the feed instead ?....this is just for my knowledge

 

[Simon F]

the feed pipe and vent pipe will mostly be at the same level
water sort of does that!

when the pump is on things can be different, especially if the pump is set to high, blockages wrong pipe layout etc

 

[Leo21]

It'll take the easiest route, the open vent.

 

[Stigster]

The vent pipe is for the expansion but is there a chance water can be pushed up from the feed instead ?....this is just for my knowledge

The cold feed is really the main point of expansion with the vent being there as a fail safe if the cold feed is turned off or otherwise blocked. As Simon F said, the water in the tank and the level in the vent pipe will be level unless it's pumping over.

 

[Last Plumber]

The vent pipe is for the expansion but is there a chance water can be pushed up from the feed instead ?....this is just for my knowledge

It is a feed and expansion pipe you're talking about. Under normal circumstances, no water should exit the Vent pipe.

 

[PhoenixServices]

They can sometimes overflow through the feed pipe if the coil in the cylinder has a split and cold water storage tank is higher than the heating expansion tank.

 

[jitenbulsara]

Thanks
Just wanted a few opinions as the ball valve was the issue but water didn't look to clever he did ask to quote for a new system too.back boilers r still around but they have had more than there day !...