I have read conflicting advice about this on the Internet and would be grateful for a definitive answer regarding the correct layout of pipework to/from an F&E tank.
Firstly, please excuse the rather amateurish drawings. The large box at the bottom is the boiler and the circle is the pump. Hopefully the F&E tank is self-explanatory! The drawings purport to show a hypothetical layout of the feed and expansion pipes in a central heating system.
The system I currently have is a mess. The pump is in the flow. The cold feed enters the flow after the pump and the vent is on the return. We get pumping over and surges of very hot water into the F&E tank which leads to aeration of the CH system, hence I need to change the layout.
In the first drawing the cold feed/expansion pipe is immediately before the pump (which is in the flow) followed upstream (but less than 150 mm away) by the vent pipe. (I have also seen arguments put forward for having the vent next to the pump rather than the cold feed).
The second image shows the same configuration but in a vertical layout. Would this work? I’m not sure if it is ok to have a right-angle bend in the vent pipe though. I would prefer the second layout as it would be much easier to modify what we have and also I like the idea of having a greater head of water above the pump.
Any thoughts/ideas welcome. Thanks.
Gofer
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Firstly, please excuse the rather amateurish drawings. The large box at the bottom is the boiler and the circle is the pump. Hopefully the F&E tank is self-explanatory! The drawings purport to show a hypothetical layout of the feed and expansion pipes in a central heating system.
The system I currently have is a mess. The pump is in the flow. The cold feed enters the flow after the pump and the vent is on the return. We get pumping over and surges of very hot water into the F&E tank which leads to aeration of the CH system, hence I need to change the layout.
In the first drawing the cold feed/expansion pipe is immediately before the pump (which is in the flow) followed upstream (but less than 150 mm away) by the vent pipe. (I have also seen arguments put forward for having the vent next to the pump rather than the cold feed).
The second image shows the same configuration but in a vertical layout. Would this work? I’m not sure if it is ok to have a right-angle bend in the vent pipe though. I would prefer the second layout as it would be much easier to modify what we have and also I like the idea of having a greater head of water above the pump.
Any thoughts/ideas welcome. Thanks.
Gofer
View media item 91268
View media item 91269