RC,
I'm trying to make sure that I understnad you correctly. I don't want a pump that will do more than 800 gph correct?
Thanks.
It needs to do 800gph at the tank. So after all the pipe loss and the head loss, you might end up with a 1200gph pump. But after all the pipe and bends it's only going to be 800gph or LESS going into your tank. Thats your max you can get out of the overflow teeth.
You'll have to use those calculators to figure out how big a pump is required to get you 800gph back in the tank.
800gph in the sump doesn't mean diddly squat. It's got to be 800gph after all the pipe bends and head loss.
My Mag 7 return pump goes through 4' of head, (5) 90's, (2) 45's, (1) ball valve, (1) union and 1' of horizontal run. All in 1.5" pipe. By the time it gets to the tank, it's just a little over 400gph. Now consider that pump is rated at 700gph with no pipe or head loss. Thats what you get right on the outlet side of the pump.
But after all the pipe it's only 400gph.
Use the calculators and fill in the numbers. Draw your design up on paper and measure it all out. Count all the valves, 90's, Tee, unions, pipe and plug it into the calculator. That will tell you how big a pump you need if you want to get 800gph back in the tank.