Center Pivot Design Presented by the Irrigation Association
Center Pivot Design Presented by the Irrigation Association
Class Objectives • You will be able to design a center pivot system by the end of class • You will understand the proper steps and techniques for designing pivots for high efficiency
Agenda - day one • • Introductions and class overview Basic pivot concepts Site inventory and analysis Pivot hydraulics
Agenda - day two • • • More pivot hydraulics Nozzling the pivot Pumps and pivots Pivots and chemigation Refining and adjusting your design
Other class info • Ask lots of questions • Breaks will be frequent but short please! • There will be coffee in the a. m. and soft drinks in the p. m. • Lunch on your own • We will be doing lots of practice sessions and group work
Important! • Please turn off your pagers and cell phones • You will need a calculator • You will need a pencil or pen
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Understanding Basic Pivot Concepts
Understand Identify Center Pivot Components • • Drive system Guidance system The pivot Nozzle types and configurations
Understand Identify Center Pivot Components • Corner systems • Controls • Injection equipment
Back to the Beginning l l Patented by Frank Zybach in eastern Colorado in July, 1952 Business arrangement between Zybach and A. W. Towbridge began in 1953 to manufacture pivots in Columbus, NE Manufacturing rights sold to Valley Mfg. In 1954 Over 100, 000 now in operation
Valley - Model 1972
Hygromatic Raincat Olson Dowd
Center Pivot Manufacturers • Reinke • T&L • Valley • Zimmatic May also deal with Olson, Gifford-Hill, Lockwood, Pierce, Hygromatic, Raincat, and others.
You want to irrigate it center pivots can be designed to do the job
Multi-Purpose Machines Wetland enhancement Wildlife habituate Watering facility
Land Mark for NASA
Making Center Pivots Work Properly • • Minimize run-off Maximize uniformity Minimize energy costs Where pivots don’t fit
We will discuss how to use soil texture and topography information
Instantaneous Application Rates Above Soil Infiltration Rates
Irrigating Irregular Field Shapes
Pivots Operate on Undulating Terrain
How do we plan for wind?
Pressure Regulation
Spacing and Overlap
Distribution and application
Time of Application Peak Application Rate Initiation Time Raingage End Time
Lets look at some system components Look for definition of terms starting on Page 297
Pivot base
Center Pivot Lateral
End Tower and Super Structure
Pivot Height • Four Profiles – Low profile 5. 1 - 7. 2’ depends on pipe size – Standard Profile 8. 6 - 10. 7’ – High profile 11. 9 - 14. 0’ – Ultra high profile 15’ +
Low profile
Super Ultra High
- Slides: 34
