Pivot_specs_15.doc

IRRIGATION SYSTEM SPECIFICATIONS

GENERAL SPECIFICATIONS

Equipment manufacturer shall have a continuous production record of center pivot irrigation systems for a minimum of 15 years.

The center pivot system provided by the manufacturer shall be of their latest and proven design.

All structural members of the center pivot systems including the pipe, shall be hot-dipped galvanized on all surfaces. Certain nominal items/brackets may be painted.

System should be of standard height with a minimum 105” ground clearance at the lowest truss. Wheel base shall be minimum 150”.

The center pivot system shall be equipped with 11.2 x 38” inch tires and appropriately sized wheels.

The center pivot systems shall be a minimum of seven towers, overall length of approximately 1296 feet. Typical ¼ section center pivot, site visitation is encouraged to ensure that pivot is optimally sized to maximize irrigated acres.

Pivot foundation pad shall be constructed by the successful bidder and comply with all requirements of the manufacture of the center pivot system.

Pivot water supply pipe to be included in bid and installed by the successful bidder. Supply line shall include a butterfly valve, an 18” flanged blank spool; a chemigation valve and a McCrometer flow meter.

The new center pivot systems shall be operated continuously for one field revolution before the successful bidders assembly responsibilities are concluded.

One copy of all pertinent instruction and/or operation manuals shall be provided with each center pivot installed.

Materials, equipment, and services not specifically mentioned in these specifications, but obviously required for the completion of the installation, shall be provided or installed by the successful bidder as though fully specified and shown.

SYSTEM CONTROL FEATURES:

Travel direction and application depths controlled at pivot point.

Application depth changes automatically by field position.

Endgun, stop in slot, and auto reverse controlled and set from pivot point.

Automatic start up on water pressure.

Beacon light located at pivot point indicating operation status.

SPRINKLER PACKAGE:

The system shall be designed and installed to meet the following criteria:

Design flow of 5.6 GPM/ACRE

Top inlet pressure 30 to 35 PSI, End pressure 20 to 25 PSI.

Sprinkler package – Standard outlet spacing for the system. A Nelson rotator sprinkler with orange corn pad. Rigid drops with 15 LB regulator. Nozzle flows should be computer designed.

A Nelson SR-100 (or equal) end gun with pressure booster pump, sized to match water distribution of main spans.

One copy of sprinkler package design printout shall be provided for each pivot The systems will be used on primarily level upland Hastings and Crete silty clay loams.

Specifications for Hydrostatic drive center pivot systems:

Hydrostatic drive systems shall meet all the structural, control features and general specifications previously described and the following:

Irrigation system should be equipped with swivel pivot point.

It is anticipated that likely power source for well and pivot will be 480 volt 3 phase. Hydraulic pump drive motor and appropriate control features to be included in successful bid. A separate or attached concrete pad shall be installed by the successful bidder for mounting of hydraulic pump.

All necessary hydraulic and electrical hookups shall be made by the successful bidder.

Specifications for electric drive center pivot systems:

Electric drive systems shall meet all the structural, control features and general specifications previously described and the following:

All electrical controls and installations should meet or exceed NEMA specifications. Systems shall be properly grounded in accordance with the National Electric Code.

Surge and over current protection: Lightning arrestor.

All necessary electrical hookups shall be made by the successful bidder.