Originally Posted by beaslbob

Got that.

under power out it would seem the outside the tank part would drain down to "F". And if the over the tank part has no air leaks then it stays primed. So normal operation would return on power resume.

but if air does accumulate or if "G" has an air leak then the over the tank part breaks siphon. The in tank loop is at the top of "B" but the external loop is down to "F". So to restart the siphon the water in the external trap at "F" must be sucked up the pvc pipe. My fear is that there is not enough water trapped to restart the siphon.

In order to insure there is enough water traped to restart the siphon you could just raise the position of "F" to just below the top of "B". That way "F" traps much more water at a higher level. Helping insure the siphon is restarted.

To exaggerate my point consider placing the "F" near a sump in the basement. Say 15' below the tank. There would be a much greater cavitation potential. Greater check valve/aqua lifter failure. And not enough water trapped to reestablish the siphon. All of which is avoided by raising "F" to just below the top of "B"

just my .02