Combining feed and vent piping from F and E tank

[Rudolph_Heller]

Thank you all for your replies and advice. I will go with the combined method (with inclined feed pipe) for now and see how it works out.
I do however have a question on the "traditional right way" as Last Plumber reccommended. What difference does it make if the feed enters the pipe to pump from the bottom rather than top?
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I think I have the answer to my own question....so that any transient air bubbles escape through the vent rather than feed..

 

[townfanjon]

Not all manufactures advise combined F& E pipes .

 

[Warmiger]

Can you not do away with the tank and pressurise the system? Less corrosion and no tanks to worry about. We generally take the tanks out these days.

 

[SJB060685]

The loop you mention is to limit the amount of heat lost up the cold feed.
Sealed systems can still sludge up if not installed properly and without the neccessary means to vent trapped air and dissolved oxygen within the water

 

[John.g]

Agree with improper installation especially the expansion vessel which is often installed with the filling pressure equal to the pre charge pressure thus leaving no reserve and leading to frequent top ups but also encouraging IMO,that friend of the rad manufacturers, the Auto fill PRV where one has no idea of any developing leak.
Of course the same can be said of the F&E tank with ballcock fill, I have a isolating valve on mine and keep this permanently shut except to check for any leaks by opening it a few times per year and in over 40 years I have yet yo hear it adding a drop of water, strange?. I also have a combined cold feed and vent installed when new, the vent is carried on up over the tank, I still have some of my original installed rads.

 

[Rudolph_Heller]

Not all manufactures advise combined F& E pipes .

The manufacturer's install manual actually shows it as combined, albeit a quite rudimentary diagram, but thanks for your input.