which return to feed a large tank from basement sump

[kevensquint]

Hi, so it needs to be electrically efficient and get a decent flow up about 12'. Also, what kind of gallonage does a sump need to be to avoid this type of pump running it dry before the display water gets back downstairs to refill?

 

[woodnaquanut]

I don't know about the pump but the flow is constant. There is no 'gets back to refill'. Same amount of water comes in as goes out. An open loop.

I notice you have thousands of posts and perhaps I misinterpreted your questions? Please excuse if that's the case.

 

[ca1ore]

12' is a lot of head pressure so you're going to need a good sized pump. None of those DC pumps are going to cut it. I use a PanWorld 150 to pump up about 10' and it loses about a third of its zero head rated capacity.

Depending upon the size of the tank and net flow, you can probably calculate how much water is going to drain down when the pump is off. It is that same amount of water that will draw down the sump level when the pump is re-energized. For example, my 265 drains down such that the level in my 75 sumo rises by 6 inches or so. This them returns to the equilibrium level once the pump is back on.

 

[hobbzz]

You're going to need a pressure rated pump. Panworld, blue line, or iwaki.

 

[Bono]

Sequence pump worked for me when I had a basement. I think I used the 3600 but its been a few years.

 

[Dmorty217]

What size tank are you feeding? What size is the sump and drains?

 

[kevensquint]

1 ~1" return and 2~1.5" overflow pipes. Electrical use is a concern so I might go with a panworld 150 or 200. There is a no name 1/10 HP swimming pool pump right now. Very loud and 3-4 amps

 

[kevensquint]

In my area its either reeflo or panworld or DC.
The sump is too small and will be upgraded, I think a 60 gallon or more DIY. But, I'm trying to figure how much water needs to be in it to insure for the first 30 seconds after start up, the return pump doesn't run dry

 

[dave.m]

But, I'm trying to figure how much water needs to be in it to insure for the first 30 seconds after start up, the return pump doesn't run dry

You need to figure out how much excess water will drain into the sump whenever the power goes off. Obviously you need this much spare room in the sump to accommodate it. Include the volume in whatever piping is involved in the return.

If you have a shut-off valve on the return that is close to the sump (even temporarily) you could prefill the display tank and return piping to what you believe will be operating height, then open the shut-off and measure how much higher the water rises in the sump (leave plenty of room).

Dave.M