Pumping Plant Fuel Comparison By Clare Prestwich Irrigation Engineer Natural Resources Conservation Service

Jan 2002 Pressure …. How do I get it?How do I get it? –Electric –Diesel –Gravity What works Best?What works Best? What can I Afford?What can I Afford?

Natural Resources Conservation Service Jan 2002 System Parameters 160 acres160 acres Grow - hay,potatoes, grain, and beetsGrow - hay,potatoes, grain, and beets System operates 1800 hours per seasonSystem operates 1800 hours per season applies maximum of.32/ DAY - 36/SEASONapplies maximum of.32/ DAY - 36/SEASON Irrigated by a Center PivotIrrigated by a Center Pivot 7 year Capital Recovery Period7 year Capital Recovery Period 10% Interest rate on operating funds10% Interest rate on operating funds

Natural Resources Conservation Service Jan 2002 Pivot Layout Operating Pressure 50psi surface water no other pumping lift required

Natural Resources Conservation Service Jan 2002 Horse power - hour per Unit of Fuel Fuel type

Natural Resources Conservation Service Jan 2002 Electric Pump station

Natural Resources Conservation Service Jan 2002 Find Total Pumping Head Total head required 117.6

Natural Resources Conservation Service Jan 2002 Find Horsepower and energy needed Need 35 hp pump and kw-h of fuel

Natural Resources Conservation Service Jan 2002 Operating Costs Annual Cost of FuelAnnual Cost of Fuel Oil- for MotorOil- for Motor –4000 whp-hrs/gal Repairs and MaintenanceRepairs and Maintenance –$1/bhp-hr/1000 hr Annual Cost of LaborAnnual Cost of Labor –0.02hrs/hr of operation Center Pivot OperationCenter Pivot Operation –hp*hrs/1.2 BPH

Natural Resources Conservation Service Jan 2002 Annual Operating Costs Yearly operating cost of $4897

Natural Resources Conservation Service Jan 2002 Pump station Investment Costs Annual invest cost $2239

Natural Resources Conservation Service Jan 2002 Final Results

Natural Resources Conservation Service Jan 2002 Other possible cost Phase ConverterPhase Converter Power LinePower Line

Natural Resources Conservation Service Jan 2002 With Phase Converter With 1/4 mile power line

Natural Resources Conservation Service Jan 2002 Diesel Pumping Station

Natural Resources Conservation Service Jan 2002 Find Horsepower and Fuel needs With extra horsepower to run Pivot 75 hp pump 8715 gals of fuel

Natural Resources Conservation Service Jan 2002 Investment costs Annual cost $3944

Natural Resources Conservation Service Jan 2002 Operating Cost Annual Cost of FuelAnnual Cost of Fuel Oil engineOil engine –900 whp-hrs/gal Oil Gear DriveOil Gear Drive –4000 whp-hrs/gal Repairs and MaintenanceRepairs and Maintenance –$3.75/ bhp-hr/1000/hr Annual Cost of LaborAnnual Cost of Labor –0.02hrs/hr of operation

Natural Resources Conservation Service Jan 2002 Operating Costs Yearly Operating cost $8608

Natural Resources Conservation Service Jan 2002 Final Results

Natural Resources Conservation Service Jan 2002 All Things being equal where is is the break even point

Natural Resources Conservation Service Jan 2002 Effects of Energy Escalation

Natural Resources Conservation Service Jan 2002 Pipe Sizing Is it cheaper to buy larger pipe and less pumping head or smaller pipe and more pumping head?Is it cheaper to buy larger pipe and less pumping head or smaller pipe and more pumping head?

Natural Resources Conservation Service Jan 2002 Economic Pipe Size based on 950 gpm $.73/gal

Natural Resources Conservation Service Jan 2002 Economic Flow rate based on Energy Price Escalation 10 pipe

Natural Resources Conservation Service Jan 2002 How about Gravity Pressure?

Natural Resources Conservation Service Jan 2002 How far Can I afford to go? Based on Annual cost of $ year pay off

Natural Resources Conservation Service Jan 2002 Instead of installing a electric pump station You can install how many feet of pipe… ? 5204 of pipe But 140 of fall is needed

Natural Resources Conservation Service Jan 2002 Pipe Length vs. Capital Recovery Period

Natural Resources Conservation Service Jan 2002 Head vs. Pipe Length

Natural Resources Conservation Service Jan 2002 Questions?

Natural Resources Conservation Service Jan 2002 Thank You! And Happy Farming