Attachment 2 - Specifications.pdf

Attachment 2 - 52B IRRIGATION PIVOT SYSTEM SPECIFICATIONS

GENERAL SPECIFICATIONS

Pivot will be installed in Section 23-T7N-R8W in Clay County Nebraska. This pivot is currently a 1970’s Valley System with a total wetted radius of approximately 1370 feet.

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

The center pivot system(s) 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. Wheelbase span shall be approximately 127 feet. The new pivot will need to be the same spans and exact measurements as this pivot will be going through 3–4-foot gate openings on every span.

The center pivot system shall be equipped with 11.2” x 38” 6 ply+ non-directional tires and appropriately sized wheels.

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

Existing chemigation valve, flow meter and service pipe may be reused on new installation. If existing equipment is not reusable, include replacement prices with pivot bid.

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 offeror as though fully specified and shown.

SYSTEM CONTROL FEATURES:

Travel direction and application depths with at least 16 programable sectors controlled at pivot point.

GPS Position and remote control ready.

Application depth changes automatically by field position using VRI sector programming.

Endgun, stop in slot, and auto reverse controlled and set from pivot point electronically and remote control ready.

Automatic start up on water pressure for 480-volt systems.

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 minimum but the well pumps 1000 GPM currently.

The pivot is serviced by a natural gas engine powered by a 15 KW generator attached to the cart.

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

Sprinkler package – Standard outlet spacing for the system. Preference for an above pipe sprinkler package. Sprinkler packages for perennial pasture should be of type and/or design that will not apply water on tower wheel tracks.

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 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.

Delivery

Normal business hours are anticipated for installation but 1 weeks’ notice of prior approval to install the pivot is required as this pivot is in a bull pasture and animals will need to be moved to allow for installation. Installation is anticipated to be in October or November of 2023 but must be installed before December 31, 2023.