center pivot design presented by the irrigation association
TRANSCRIPT
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
© Irrigation Association
Irrigation, Sixth Edition
Over 1500 years combined knowledge and experience summarized in 1100 pages
Member price $134.00
Non-member price $179.00
IA Bookstore
Order online www.irrigation.org
Understanding Basic Pivot Concepts
Understanding Basic Pivot Concepts
Understand and Identify Center Pivot
Components
• Drive system• Guidance system• The pivot• Nozzle types and configurations
Understand and Identify Center Pivot Components
• Corner systems• Controls• Injection equipment
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
Back to the Beginning
Valley - Model 1972
Hygromatic
Olson
Raincat
Dowd
Center Pivot Manufacturers
• Reinke• T & L• Valley• ZimmaticMay also deal with Olson,
Gifford-Hill, Lockwood, Pierce, Hygromatic, Raincat, and others.
You want to irrigate itcenter 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
Raingage
End Time
Time of Application
Initiation Time
Peak Application
Rate
Lets look at some system components
Look for definition of termsstarting 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