Irrigation Engine Ratings Guide - Caterpillar

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Power EstimatorFor Top <strong>Irrigation</strong> System Efficiency...This selection guide will help you identify your irrigation power needsand choose the right Cat engine to meet those needs efficiently. Highreliability and low lifetime cost often make Cat engine power yourmost attractive option.First, follow these 12 steps to calculate the flywheel power yourirrigation system requires. Then match your results to the selectioncharts on the following pages to see which Cat engine offers thebest efficiency and economy. An automated Power Estimator is alsoavailable online at www.cat.com/irrigation.Determine Total Dynamic Pumping Head1. Static HeadVertical distance pump must lift water from pickup point todischarge.Pickup point is the draw-down water level in the well or thesurface of stream or pond from which water is pumped.Discharge level, in the case of a pivot or traveling system, isheight of the sprinkler at highest point in the field.2. Pressure HeadFor open discharge to pond or canal, pressure head = 0.For sprinkler system a fair initial estimate is 415 kPa (60 psi).Actual value varies from 275 kPa (40 psi) for a low pressure systemto about 550 kPa (80 psi) for a high pressure system. MultiplykPa x 0.102 to get meters pressure head (psi pressure x 2.31 = ft.pressure head).3. Friction HeadEstimate 1 m (ft) friction head per 100 m (ft) pipe run from pickuppoint to start of sprinkler system or to open discharge. Actual valuebased on pipe selection, bends, fittings.4 Total Dynamic Pumping HeadTotal of 1, 2, and 3.4i r r i g a t i o n E N G I N E
Power EstimatorCentrifugal Pump taking water frompond to open dischargeFRICTION HEADDISCHARGE LEVELSTATIC HEADPICK-UP POINT (PRESSURE HEAD = 0)Preliminary EstimateFinal Calculation____________ mft____________ mft____________ mft____________ mft____________ mft____________ mft____________ mft____________ mftr a t i n g S G U I D E 5
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Irrigation Engine Ratings Guide - Caterpillar

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