My system is open vented.
I'm concerned that to avoid "Rise and fall to any degree" would require the use of a theodolite.
I suppose I could pass a run of transparent polythene hose down the intended route, fill it with fizzy fluorescent yellow Gatorade and see which end bubbles drift toward, and whether or not they coagulate into CO2 pockets (assuming the ability to inspect the full length).
However, it seems it would be easier if someone could authoritatively state that a rise & fall in pipework of an open vented system (with say 1m head, and a 5m head circulator) only leaves residual air pockets at h cm, and is not liable to cause an air lock until H cm.
Given such figures I would then have an idea as to just how careful I'd have to be - or not (preferably).
I'm concerned that to avoid "Rise and fall to any degree" would require the use of a theodolite.
I suppose I could pass a run of transparent polythene hose down the intended route, fill it with fizzy fluorescent yellow Gatorade and see which end bubbles drift toward, and whether or not they coagulate into CO2 pockets (assuming the ability to inspect the full length).
However, it seems it would be easier if someone could authoritatively state that a rise & fall in pipework of an open vented system (with say 1m head, and a 5m head circulator) only leaves residual air pockets at h cm, and is not liable to cause an air lock until H cm.
Given such figures I would then have an idea as to just how careful I'd have to be - or not (preferably).