Attachment 5 Center Pivot Irrigation - Technical Specifications.pdf

Project: Install Center Pivot Irrigation System – Fort Keogh Livestock & Range Research Laboratory, Miles City, MT

CENTER PIVOT IRRIGATION EQUIPMENT SPECIFICATIONS

Part 1 General

1.01 Description of Work – Pivot Irrigation System

A. An authorized center pivot dealer will furnish, install and place in satisfactory operating condition center pivot(s) and all required appurtenances in accordance with the approved plans and specifications.

B. The unit(s) will be a self-contained, electrically propelled land irrigation machine driven by individual drive unit structures supported on rubber pneumatic tires. The basic power train will consist of a three-phase electric motor at each drive tower that will drive the wheels through a series of gear reductions.

Each tower will be electrically controlled to maintain the selected operating speed and correct alignment.

C. A control panel will provide operator control from the pivot point.

D. The pivot irrigation equipment will be supplied by a manufacturer who conforms to Quality Standard, ISO 9001, 1994.

1.02 Design Criteria

A. All equipment furnished will be new and unused, and will be the product of a manufacturer having successful experience in the manufacture of center pivot irrigation equipment.

B. All equipment provided will be capable of maximum interchangeability of spare parts. The equipment incorporated in this proposal will be the product of, and furnished by, a manufacturer who is regularly engaged in the production of such equipment for similar applications, and who has an experience with installations similar to that contemplated in these specifications.

C. All of the equipment will be the manufacturer's latest and proven design. Specifications call attention to certain features, but do not purport to cover all details entering into the design of the entire pivot.

D. All electrical components of the pivot will operate from a 480-volt, three-phase, 60-Hertz, 4-wire power supply to be provided at the pivot as per ASABE Standard S397T.

E. All controls for remote electrically operated or motor driven equipment will be complete, including all necessary auxiliary relays, so as to, require only remote wiring and wiring connections to the equipment.

F. Commercially plated fasteners will be used on all connections, including the drive train U-joints, center drives and wheel gearboxes.

G. All necessary fuses or switches required by the manufacturer for his equipment will be provided with the equipment.

1.03 Basis of Bid

A. It is the intent that all equipment as defined from the pivot point to the end of the machine in this specification shall be supplied by the irrigation pivot manufacturer. Other manufactured or supplied material to be designed, procured and installed by the authorized dealer.

B. The manufacturer or dealer of the center pivot irrigation equipment will erect the center pivot with one or more factory trained personnel. This will include assembly of the mechanical portion of the center pivot, and start-up and adjustment of the equipment. This portion of the manufacturer's responsibility will be concluded when the center pivot has been operated continuously for one (1) field revolution.

C. The pivot point foundation will comply with the requirements set by the center pivot manufacturer.

1.04 Instruction Manuals

One (1) copy of the Owner’s Manual will be inserted inside the door of the pivot control panel.

1.05 Structural – Pivot System

A. 8 5/8” Pivot Point - The four-legged pivot point structure will be erected with .135” x 4.1" x 4.1" roll formed angle. The horizontal braces will be .163" x 2" x 2” or larger angle. Fixed pivot leg pads will be provided. The rotating swivel will be constructed with a stainless-steel nipple that provides a smooth durable surface for the riser gasket water seal. The riser pipe will be 8 5/8" O. D., 12 gauge (.109" wall) hot dipped galvanized steel with a Pierce Coupling and triple lip seal and is attached with riser support steel rods to the non-rotating swivel bearing. Two horizontal riser support angles and a gusset will stabilize the riser against deflection.

B. Steel Pipeline - The main structural water supply pipe will be 12 gauge (.109” wall) hot dipped galvanized steel. A combination of 6”, 6 5/8”, 8 5/8” and 10” O. D. pipe may be used to minimize the pressure loss through the pivot. Water outlet couplings to be ¾” NPT steel welded to the top of the pipeline. Outlet spacing to be 30” or 108” (to be determined based upon final design).

C. Pipe Support Structure - The pipe support structure of the pivot will be of a bow string, under truss design. Vee positioned truss angles will be 0.163" x 2" x 2" or 1/8 " x 2" x 2" attached to wrap around brackets welded to the pipes. The truss angles will be supported with a 0.163" x 2" x 2" or 1/8 " x 2" x 2" spreader angle positioned perpendicular to the pipeline. Truss rods will be a minimum of 11/16” diameter steel and the rods will have radius hot forged head ends.

D. Span Connections - The spans will be connected using an external ball and socket flex joint which allows for span-to-span flexibility and does not transmit bending or torsional stresses into the pipe. The pipeline flex hose will be replaceable without disengaging the structural components of the flex joint and without any lifting equipment. The flex joint will not obstruct the water flow inside the pipeline. The flex hose will match the pipe diameter.

E. Drive Unit Tower - The drive unit tower will be a four-legged structure designed to withstand the forces induced when traversing rough terrain and ridged row crops. The drive unit legs will be fabricated from 1/4" x 3" x 3" or 3/16” x 3” x 3” angle. Two diagonal and six horizontal pre-galvanized braces will provide rigidity and strength to the drive unit. The horizontal base beam at the lower end of the structure will be constructed of 6 5/8" O. D., 12-gauge (.109”) pipe and will provide a wheelbase of 13.3 feet.

F. Drive Unit Attachment - The fixed pipe of each span will be constructed of one piece of tubing. No stub pipe assemblies will be used. Drive unit legs will be attached to the one piece fixed or last pipe assembly to minimize the number of flanged connections on each span.

G. Tower Supports - Two 2.875” O. D. 14 gauge (.083) pre-galvanized tubular tower support assemblies will be attached between the drive unit legs (Upper Brace connection) and pipeline attachment brackets.

The tower supports will also be tied into the truss rods with a cross channel member. This arrangement provides a unitized support structure to withstand tension and compression forces as the towers move around the field on level and rolling terrain.

H. Structural Component Finish - All critical structural members, including the pipe, angles, and base beam will be hot dip galvanized per ASTM Specification 123 on all surfaces, with the exception of the Xenoy nipple and various small brackets, which will be painted or plated.

I. Fasteners - All bolts will be Grade 5 minimum. Locknuts will be used in all structural assemblies. All fasteners will be plated for corrosion protection.

1.06 Drive Train

A. Center Drive - The center drive will use a high efficiency, totally enclosed irrigation duty motor directly coupled to a double reduction gearbox with stainless steel stator bolts. Steel heat treated helical gears will be used for maximum efficiency and strength. The motor housing will be finned aluminum to provide additional cooling for longer life. The complete unit will be designed to operate under extreme environmental conditions and is CSA and UL certified. The center drive motors will be 0.6 Hp (UL rating .8 Hp) and/or

1.2 Hp (UL rating 1.6 Hp) with a thermal sensitive device to protect the motor against excessive current or heat.

One (1) motor at each drive unit provides input power to the two-wheel gearboxes and will operate at 1800 (4-pole) or3600 (2-pole) RPM for standard and high speed respectively. The motors will be rated at 1100in.-lb. torque with a 1.3 service factor (continuous rating 1400 in-lb.) and 6800 in.-lb. starting torque. Amp draw will be 1.1 (0.6 Hp) and 1.8 (1.2 Hp).

B. Wheel Gearbox - The pivot will be equipped with gearboxes (52:1 gear ratios) with a rating of 30,000 in.-lbs. continuous output torque for a minimum of 1000 operating hours, and capable of withstanding 150,000 in.-lbs. instantaneous output torque without failure. The wheel drive gearboxes will be a self-locking worm gear design to provide positive braking. The cast iron worm wheel and integral ductile worm input shaft will have a 25-degree pressure angle design for full recessed action and proper lubrication.

The gears and American made bearings will operate in a submerged oil bath. A hermetically sealed 15.9 cubic inch vented expansion chamber with a rubber diaphragm will compensate for variations in operating temperature to minimize pressure fluctuations inside the gearbox. The output shaft of the wheel gearbox will be 2 1/4" diameter, stress relieved, cold drawn steel. The input and output shaft will use a cartridge type seal construction containing 7-barriers that resist water contamination and oil leakage. The inner part of the seal will turn with the shaft to minimize grooving. All gearboxes will be properly filled with lubricant by the manufacturer. Visual inspection of the lubricant will be provided by removal of the expansion chamber cover or fill level plug.

C. Gearbox Oil - The gearboxes as shipped will be filled with oil to its normal operating level. The original lubricant will meet SAE 85W/140 API classification GL5. Replacement lubricants must meet manufacturer’s specification.

D. The drive shafts will be designed to withstand the maximum torque of the drive train with no permanent deformation and will be 7/8" square steel. The drive shaft will be adequately shielded to meet OSHA safety standards. Greaseless U-joints will connect the drive train components. The U-joints will incorporate flexible urethane inserts to absorb shock from motor starts and stops to reduce stress.

Urethane inserts anchored between cast aluminum yokes will be attached to the drive shafts with four (4) 1/4" cap screws.

E. Tires will be 11.2 x 38 have an R-1 agricultural traction tread design. The rims will be hot dipped galvanized in accordance to ASTM 123.

1.07 Control Panel

A. A control panel will be provided with the pivot. The essential characteristics include:

1. Start-stop

2. Ability to change speeds or depth of application

3. Direction control, forward or reverse

4. Position given in a field display

5. Programmable end gun controls

6. Programmable functions by field position, time, date and external inputs

7. Programmable application rate by field position

8. Digital voltage display and low voltage shut down

9. Advanced diagnostics for easy troubleshooting

10. 10-inch or 5-inch full color touchscreen display

12. Pump start/stop

13. Bypass switch for engine run/start

14. Stop-in-slot bypass

15. Wet and dry digital hour meter

16. GPS ready

17. Cruise Control

18. Telemetry has to be built into panel.

B. The main control panel will be constructed to meet or exceed the standards for a National Electrical Manufacturers Association (NEMA) Type 3R enclosure. All operator controls will be protected from the elements by an outside door. The main panel will also be provided with latches to accommodate a padlock. 480-volt, three-phase, 4-wire, 60-cycle electrical power will be furnished to the main control panel at the appropriate amperage to match the pivot requirements. The pivot panel will be rated for 30 amps or 45 amps depending upon the total pivot amperage requirements based upon the number of spans, drive motors and end gun booster pump as calculated in VSOC. All wiring will be color coded.

C. Each main pivot control panel will include functional capability for starting/stopping, speed/depth of water applied, start/override button, forward-stop-reverse, 480/120 control transformer, volt meter, fuses and main disconnect switch. The diagnostic display will identify cause for pivot shut-down from control panel, towers or end tower. Each center pivot will be equipped to automatically restart itself in the event of a power interruption, up to three (3) seconds in duration, and to shut itself down if the pivot fails to move for a preselected time interval. Units will be grounded in accordance with the National Electric Code, Article 250, Section H.

D. The main pivot panel can should include capabilities to be equipped with auxiliary contacts which will interface with auxiliary equipment. However, safety circuit wire and main power cable are to be supplied and installed by another supplier/contractor.

1.08 Electrical

A. The pivot electrical circuits will operate from a 480-volt, three-phase, 4-wire power (with ground) source with a step-down transformer for the seven conductor 120-volt, VAC., single-phase control and safety circuits.

B. The main power cable from the pivot box to the tower boxes will be a minimum 12 gauge stranded copper wire. All exposed wiring will be bundled and jacketed with a black, U.V. stabilized polyethylene cable jacketing material.

C. The individual tower panels will be constructed to meet or exceed the standards for a National Electrical Manufacturers Association (NEMA) Type 3R enclosure. All wiring will be color coded.

D. The electrical alignment system will consist of micro-switches for tower alignment and safety shutdown. The motor control or alignment micro-switch will not cycle the center drive motors more than once each 10 seconds.

E. Integral, thermal sensitive automatic reset overload protection will be provided for all 480-volt motors. A suppresser circuit will be provided in each tower control box to reduce arcing at contacts.

F. The collector ring will be mounted on a stainless-steel J Tube that extends through the rotating swivel.

A three-cap screw top clamp and V seals will provide a water tight seal around the tube. A collector ring cover with gasket will protect the internal electrical components against the effects of the environment.

F. The collector ring will use 11 sliding contactors rated at 600 volts and either 35 amps or 45 amps to match the control panel. To assure positive contact of the brushes to the contact point, leaf springs will be used. Slip rings will be seamless and not more than 4" in diameter.

G. Electric irrigation equipment to be designed and manufactured according to the National Electrical Code (NEC) Article 675, including:

Article 430 - motors, motor circuits and controllers Article 250 - grounding Article 240 – over current protection Article 310 - conductors for general wiring

H. Equipment will also be designed to meet the conditions outlined in ASABE Standard: ASABE S362.

This standard covers all electrical equipment, apparatus, component and wiring necessary for electrically driven or controlled irrigation machines from the point of connection of the electric power to the machine.

Other Standards cited are:

ASABE 318 - Safety for Agricultural Equipment ASABE S350 - Safety Alert Symbol for Agricultural Equipment ANSI 235-1 - Specification for Accident Prevention Signs NEMA 151.1 - Controls and System NFPA No. 70 - National Electric Code

I. All electrical components and wiring will meet or exceed the requirements of the National Electric Code, Article 675, and American Society of Agricultural and Biological Engineers Standard S362, "Wiring and Equipment for Electrically Driven or Controlled Irrigation Machine."

J. All part circle operating pivots will be equipped with End of Field Auto Stop/Auto Reverse units with barriers to ensure that encroachment beyond field boundaries is prevented. These devices will be mounted on a distant tower unit.

K. Options may be specified to provide additional capability for the pivot.

1.09 Service

The manufacturer is represented on the project by a center pivot dealer who will install and provide warranty support for the equipment provided by center pivot manufacturer.

1.10 Training

The dealer will orient the on-site operators regarding operation of the pivot equipment.

1.11 Pivot Configurations

Span Lengths have to be:

Length

(ft)

Length

(m)

Dia.

(In)

Dia.

(mm)

Wt.

(Lbs.)

Wt.

(Kg.)

Truss Qty

Pipe Outlet Ground

Clearance

11.2 x 24 Tires

Standard Profile (ft)

Ground Clearance

11.2 x 24

Tires Standard

Profile (m)

108"

30"

160 48.76

9788 4440 6 9.3 2.83

140 42.67 8752 3970 5 9.6 2.93

135.2 41.2 8503 3857 5 9.3 2.83

120 36.57 7716 3500 5 9.3 2.83

115.1 35.08 7462 3385 4 9.6 2.93

112.5 34.29 7328 3324 4 9.5 2.9

180 54.86

8.625

9024 4093 7 8.9 2.71

160 48.76 8188 3714 6 9.2 2.8

140 42.67 7352 3335 5 9.5 2.9

135.2 41.21 7151 3244 5 9.2 2.8

115.1 35.08 6311 2863 4 9.6 2.93

225 68.58

6.625

8115 3681 9 8.8 2.68

204.9 62.45 7524 3413 8 9.4 2.87

186.7 56.91 6989 3170 7 9.8 2.99

184.8 56.33 6933 3145 7 9.8 2.99

180 54.86 6792 3081 7 9.6 2.93

160 48.76 6204 2817 6 10.2 3.11

140 42.67 5616 2547 5 10.1 3.08

135.2 41.21 5475 2483 5 9.8 2.99

115.1 35.08 4884 2215 4 10 3.05

204.9 62.45

6848 3106 8 9.7 2.96

186.7 56.91 6373 2891 7 9.9 3.02

184.8 56.33 6323 2868 7 9.9 3.02

180 54.86 6198 2811 7 9.8 2.99

160 48.76 5676 2575 6 10.3 3.14

135.2 41.21 5029 2281 5 9.9 3.02

1.12 Water Distribution

A. The sprinklers assembly will attach at a ¾” coupler on the top of the span pipe by the following components to position discharge at approximately 5 feet (60 inches) above the soil: Galvanized U-pipe 3/4M NPT x ¾ F NPT; and variable length drop pipe. Nelson R3030 rotator sprinkler utilizing a flow control nozzle, multi-trajectory orange rotator plate and R3030 cap/motor.

B. Sprinkler assembly on two (2) sprinkler outlets prior to and one sprinkler outlet after each tower drive unit will consist of a 6” galvanized U-pipe, followed by a galvanized drop pipe to position the sprinkler at 60 above the ground surface. Nelson part circle (PC-R3030) (or approved equal) rotator sprinkler utilizing a 3NV nozzle, will be positioned on both sides of the drive towers to direct water away from the tire track.

Pump Site Specifications?