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· Registered
39 Posts
To consider your problem, there are a few pieces of information required.

What is the the dailywater flow (gals/day)
How many of each type of animal will be there?
What is the head?
What is the elevation change from the pond to the end point?
What is the proposed pipe length, in feet?
What is the nameplate information on the pump itself?
(goal: to look up the pump curve)
What will be the storage mechanism for the water for the animals?
What will be the control strategy for level in the tank?
The plan is for warm (not freezing weather) use?

I'm sure others have ideas ... fordy??


· Registered
39 Posts
Alex's posting was spot on.

You need to consider the nature of the pump design for the application you have. While there are many, many types of pumps, there are a specific few that might have merit depending upon your situation.

Three issues are relevant there in terms of pump design.


I believe i understood that your pump was getting its water directly from a pond.

Is this correct?
A Will your pump be inserted below the water line of your supply under all conditions?
B Will your pump have to "suck up" water from the water line?
C Is you water human drinkable quality or will it have particles (say, sand or silt)? Affects pump clearances and internal materials. Centrugal pumps are normally not "in the water", but submersible pumps are. They don't go dry when a "self priming" style is selected.


If you look up pumps, you might want to start at the Gould's pump catalog.

Once registered, you go for the pump selection, selecting all types and all speeds, and the flow rate (5 gpm) and the head (102 ft) and you will get a series of pumps.....

Three without flags

MULTISTAGE 1HMS 3500 1HMS3 144 32 2 0.568-
MULTISTAGE 1SV_8-16 3450 8 Stage 3 HP 365 27 2.24 1.62 --- ---
MULTISTAGE 2HMS 3500 2HMS3 126 30 3 0.53 --- ---

if you examine the two whose hp rating is about 1/2 HP (the 3 hp is too much for what you need)

Then you can exanine the pump curve.

Lets say you are looking at the 2HMS3 (and later the 1HMS3)
You can use the pump curve in several ways... from the design point of 102 ft and 5 gpm, you could go up to see how much head it could provide at 5 gpm (roughly 127 ft by my eyeball) or, if you had a presure drop of only 102 feet, move horizontally to the right for a flow of someting like 20 gpm.

But what is the REAL flow? Well, there is something called a system curve, which Alex described. As the flow goes up the pressure loses increase (that is the HEAD, in feet, increases). The pump curve goes from upper left down to lower right. The system curve goes from lower left to upper right ....So,if we plotted the system curve over the pump curve, the intersection is the operating point.

You can google/ look up Hazen -Williiams equation and caclulate your system flows, if you're careful. Follow Alex's lead. For the design conditions here, we get about 6.7 gpm at something like 125 ft of that point, we look down on the pump curve and note the hp rating and the NPSHr. Its higher than the .53 hp in the selection table... but far less than 1.0 hp... also your NPSHr is only 3 feet .. I'll let Alex describe that ....

Do this for the other pump. You may well want the one with a larger head capacity .... This is all part of the process...

best fortune


· Registered
39 Posts
Leaks come form freezing, from driving over, uv attacks on pipe. Underground is better. There are different grades and types of plastic pipe....guess what , the more it costs the better it often is ....

"Currently, my first 800 feet is 1.5 inch poly pipe. Maybe I should do 1.5 for another few hundred, then 1.25 for the next thousand, and then 1 inch pipe the rest of the way ???"

I think the material cost of the pipe is really not the biggest cost you will experience ... Over five years, your electrical costs might be range from $75 to 150. Your pump costs might be 20% higher. A real designincludes a lifecyle analysis... This may be a matter of over engineering going on here. Alex has another good point .... what do you have more of: time and calculation capability OR money?

There are (at least) two schools of the "just do it" kind.

You could do the bigger stonger better theory. Not efficient, but very reliable


Build it cheap, fix what breaks. Not very reliable, but if you're sorta close the first time, then you won't have to replace everything a second time.


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