offset Posted March 27, 2011 Share Posted March 27, 2011 I need to find out how far away a 1.5HP bore pump deliver water without losing to much pressure at the moment it gives about 120 ltrs per min at the top of the bore hole and the furthest I need to get it is about 400 mtrs away Link to comment Share on other sites More sharing options...
WatersEdge Posted March 27, 2011 Share Posted March 27, 2011 Here's the Short answer followed by the exact Solution. Use not less than 2" Pipe Now for the Exact Solution; Download my Irrigation Calculator from this link Plug in the information required in the Yellow Color Cells. Couple more pieces of information needed. You know Volume Flow is 120 lpm, put that in Cell D11 You know your Length of Pipeline is 400 meters Put that in Cell D24 Water Level below Pump while pumping Elevation difference between Pump and Destination Add those two and put in Cell D25 What is your electricity rate? Put that in Cell D50 How many hours per year will you run? Put that in Cell D51 The answers then come out in the Blue Cells If you run a lot, you need 3" Pipe If you run only a little then 2" If you have any further questions, Here I am. Link to comment Share on other sites More sharing options...
offset Posted March 28, 2011 Author Share Posted March 28, 2011 Watersedge thanks for the chart it shows me that I might be OK with a 1.5 HP pump but it might be a bit small I have another bore hole with a smaller pump in it is it OK to run 2 pumps into the same system but with different HP Link to comment Share on other sites More sharing options...
WatersEdge Posted March 29, 2011 Share Posted March 29, 2011 (edited) Yes, That's OK If you can run one pump more hours it's best. Details almost always matter. The general concept is allowable but some careful thought is necessary for good efficiency. Ideally the two pumps are of similar pressure capability, and are located at similar elevation. Otherwise there will be increasing mismatch Each pump has a performance curve peak. Operating off that peak is a waste of energy, just as line friction is. It's possible that one pump could run at it's peak pressure, but pump very little water, and therefore just waste electricity. If it's any comfort, the amount of electricity wasted spinning on idle against excessive line pressure, would not be as much as would be consumed under full volume load. You will know that a pump is not moving water if the case is hot.... the water isn't passing through, so just sits there and absorbs heat of friction as the pump spins. For any irrigation system you need to take all those spreadsheet parameters into calculation. As you complicate the system beyond bare bones, you also have to deal with consequence. Edited March 29, 2011 by WatersEdge Link to comment Share on other sites More sharing options...
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