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-   -   Sump Pump discharge question (http://www.diychatroom.com/f7/sump-pump-discharge-question-138675/)

hubaseball02 03-29-2012 07:10 PM

Sump Pump discharge question
 
I'm going to be installing a Triple safe sump pump from Zoeller. The system will have a 1/3HP and 1/2HP pump along with battery backup. Will these pumps be enough to pump the water out through the discharge line which will run under the floor about 30' and up 10' to the outside?

Thanks

oh'mike 03-29-2012 07:28 PM

I suggest you call Zohler--that is a long run--is the discharge pipe under the basement slab --then up 10 foot?

Jackofall1 03-29-2012 07:35 PM

Hello and welcome HU, to the best darn DIY'r site on the web.

Are both pumps intended to run together?

What is the GPM rate and TDH of the pumps?

What is the size of the intended or current sump line?

With those questions answered a calculation could be performed to see what the head loss would be, resulting in a pump performance expectation.

Mark

hubaseball02 03-29-2012 09:16 PM

Quote:

Originally Posted by oh'mike (Post 888117)
I suggest you call Zohler--that is a long run--is the discharge pipe under the basement slab --then up 10 foot?

It is running in the trench that will be dug for the drain tile.

oh'mike 03-29-2012 09:29 PM

What size pipe?

hubaseball02 03-29-2012 09:30 PM

Quote:

Originally Posted by Jackofall1 (Post 888126)
Hello and welcome HU, to the best darn DIY'r site on the web.

Are both pumps intended to run together?

What is the GPM rate and TDH of the pumps?

What is the size of the intended or current sump line?

With those questions answered a calculation could be performed to see what the head loss would be, resulting in a pump performance expectation.

Mark

Only one pump runs at a time unless the water fills up faster then the first pump can pump. In that case the second pump will kick in to assist.

The line will be 1 1/2" pvc

TDH?

Here is what I found for some of the specs. Not sure exactly what everything means but hopefully someone will be able help out.

Float Type:Vertical FloatGPH @ 0 feet:2680 GPHGPH @ 5 feet:2680 GPHGPH @ 10 feet:2040 GPHGPH @ 15 feet:1140 GPHGPH @ 20 feet:OffDischarge Port Size:1-1/2 InchBuilt-in check Valve:No

hubaseball02 03-29-2012 10:09 PM

Quote:

Originally Posted by oh'mike (Post 888191)
What size pipe?

The pipe will be 1 1/2"

Jackofall1 03-30-2012 04:17 PM

Quote:

Originally Posted by hubaseball02 (Post 888192)
Only one pump runs at a time unless the water fills up faster then the first pump can pump. In that case the second pump will kick in to assist.

The line will be 1 1/2" pvc

TDH?

Here is what I found for some of the specs. Not sure exactly what everything means but hopefully someone will be able help out.

Float Type:Vertical FloatGPH @ 0 feet:2680 GPHGPH @ 5 feet:2680 GPHGPH @ 10 feet:2040 GPHGPH @ 15 feet:1140 GPHGPH @ 20 feet:OffDischarge Port Size:1-1/2 InchBuilt-in check Valve:No

TDH = Total Displacement should have been Dynamic Head measured in Ft of water column.

Pump performance 15 ft 1140 Gallons per hour (19 GPM) means it has the capacity to overcome 15 of head loss (this doesn't translate to feet of pipe, this is pressure loss).

The information you have given is for only (1) pump, but at 19 GPM I ran the calc assuming 80 ft of pipe (this allows for 3 x 90* elbows plus vertical rise and some extra to boot. The total loss is only 2.1 ft of head, pump is suitable, find the info for both pumps and I will run the calc for both running together.

Mark

Daniel Holzman 03-30-2012 04:29 PM

Jack, TDH stands for total dynamic head, not total displacement head. Total dynamic head is the combination of static head (the elevation difference between the intake pipe and the discharge pipe) and the dynamic loss due to friction from flow through the pipe. Dynamic loss is typically figured in equivalent static feet, to make it easy to add the dynamic losses to the static head difference. The pump curve always tells you the flow rate at a given total dynamic head.

The pump curve will tell you how many gallons per hour the pump produces at a given total head. In your case, with 30 feet of line, you are not going to have more than a few feet of friction losses, so figure your total dynamic head at around 13 feet, so you will pump somewhat more than 1140 gallons per hour, and Jack's calculations are correct. What is not so clear is how much inflow you will get, no one on this forum can tell you that, it is a function of the groundwater table and how you are collecting the water.

Jackofall1 03-30-2012 04:55 PM

Yes you are correct, this is what happens when you try and do 3 things at once, dynamic is correct, perfect definition.

Mark

hubaseball02 03-30-2012 06:08 PM

I wanted to thank everyone for the replies and input. I got in contact with Zoeller regarding the setup and they had confirmed that both the 1/3hp and 1/2 will be able to handle the setup.

Thanks again.

Jackofall1 03-30-2012 06:56 PM

The next question is, you mention across the floor, up the wall and out, how far out away from the house?

Mark


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