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Comprehensive Comparison of Pumping Plant Fuel Options for Irrigation Systems

This guide by Clare Prestwich, an irrigation engineer with the Natural Resources Conservation Service, explores the pros and cons of electric, diesel, and gravity-powered pumping systems for irrigation. It evaluates system parameters for a 160-acre farm growing crops like hay, potatoes, grain, and beets, analyzing annual operating costs, investment costs, and potential returns. The study highlights the required horsepower, energy needs, and economic feasibility of different options, including the break-even point regarding energy escalation and pumping head economics.

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Comprehensive Comparison of Pumping Plant Fuel Options for Irrigation Systems

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

  2. Pressure …. • How do I get it? • Electric • Diesel • Gravity • What works Best? • What can I Afford?

  3. System Parameters • 160 acres • Grow - hay,potatoes, grain, and beets • System operates 1800 hours per season • applies maximum of .32”/ DAY - 36”/SEASON • Irrigated by a Center Pivot • 7 year Capital Recovery Period • 10% Interest rate on operating funds

  4. Pivot Layout Operating Pressure 50psi surface water no other pumping lift required

  5. Horse power - hour per Unit of Fuel Fuel type

  6. Electric Pump station

  7. Find Total Pumping Head Total head required 117.6’

  8. Find Horsepower and energy needed Need 35 hp pump and 52402 kw-h of fuel

  9. Operating Costs • Annual Cost of Fuel • Oil- for Motor • 4000 whp-hrs/gal • Repairs and Maintenance • $1/bhp-hr/1000 hr • Annual Cost of Labor • 0.02hrs/hr of operation • Center Pivot Operation • hp*hrs/1.2 BPH

  10. Annual Operating Costs Yearly operating cost of $4897

  11. Pump station Investment Costs Annual invest cost $2239

  12. Final Results

  13. Other possible cost • Phase Converter • Power Line

  14. With Phase Converter With 1/4 mile power line

  15. Diesel Pumping Station

  16. Find Horsepower and Fuel needs With extra horsepower to run Pivot 75 hp pump 8715 gals of fuel

  17. Investment costs Annual cost $3944

  18. Operating Cost • Annual Cost of Fuel • Oil engine • 900 whp-hrs/gal • Oil Gear Drive • 4000 whp-hrs/gal • Repairs and Maintenance • $3.75/ bhp-hr/1000/hr • Annual Cost of Labor • 0.02hrs/hr of operation

  19. Operating Costs Yearly Operating cost $8608

  20. Final Results

  21. All Things being equalwhere is is the break even point

  22. Effects of Energy Escalation

  23. Pipe Sizing • Is it cheaper to buy larger pipe and less pumping head or smaller pipe and more pumping head?

  24. Economic Pipe Size based on 950 gpmelectric @$0.06/Kw-hr, diesel @ $.73/gal

  25. Economic Flow ratebased on Energy Price Escalation10” pipe Diesel @$1.30

  26. How about Gravity Pressure?

  27. How far Can I afford to go? Based on • Annual cost of $7136 • 7 year pay off

  28. Instead of installing a electric pump station You can install how many feet of pipe… ? 5204’ of pipe But 140’ of fall is needed

  29. Pipe Length vs. Capital Recovery Period

  30. Head vs. Pipe Length

  31. Questions?

  32. Thank You!And Happy Farming

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