Attachment A - Statement of Work.docx

STATEMENT OF WORK USDA – NRCS

Jimmy Carter Plant Materials Center

VARIABLE FREQUENCY DRIVE PUMP (VFD) PROJECT

Americus, Georgia April 2021

STATEMENT OF WORK

A. Scope of Work

The Jimmy Carter Plant Materials Center (PMC) operates a lateral move overhead irrigation system equipped with hardware, software, and controls to apply water according to variable rate prescription. An existing well, GA groundwater permit A02-129-0439, provides the irrigation water on demand but lacks the ability to adjust flow rate. To improve management and conservation, additional flow rate and pressure control is needed to better utilize variable rate water application.

The Contractor is responsible for designing, furnishing, and installing a Variable Frequency Drive (VFD) (capable of providing variable flow and variable pressure) and a rain sensor capable of shutting off the system during rain events compatible with the existing 50 horsepower 3 phase electric submersible pump.

The pump control system must have the capabilities to utilize proven technology in control design for a combination of flow and pressure ranges to provide the desired operating conditions of the pumping system. The pump and control system must be operator and maintenance friendly to ensure ease of system setup and maintenance and to limit down time. The Contractor will develop and provide a site-specific operation and maintenance (O&M) plan for the irrigation pump/motor and VFD controls to JCPMC.

The Plant Materials Center (PMC) electric turbine pump and motor design and installation consists of the performance of all operations necessary to:

(1) Size VFD with the capabilities to operate ranges for pump output pressures and flow rates shown in Table 1.

Table 1. Proposed output discharge pressures and flow rates for the VFD.

(2) Provide programming of the irrigation pump controller to allow PMC staff to operate existing lateral move irrigation variable rate water application with flow rates between 100 gallons per minute (gpm) and 425 gallons per minute (gpm) while maintaining the designed operating pressure at the lateral move system of 17 pounds per square inch (psi).

(3) Install VFD equipment at existing pumping station location.

The Contractor will design the control system to utilize proven technology in control design for a combination of flow and pressure ranges to provide the desired operating conditions of the pumping system.

The factory assembled system must include:

· Variable Frequency Drive

· VFD protection package

· Line and load reactor as required

· Lightning arrestors

· Pressure transducer and flow meter

· Enclosure

· Main disconnects

· Circuit breaker

· Alarm The existing pump, motor, electrical components, and appurtenances are located within an existing pumphouse. See Figure 2 for photographs.

Contractor will furnish all personnel, equipment, labor, materials, transportation, office space, and other incidentals as required to perform the work in accordance with specifications, policies, etc., referenced within this SOW.

All electrical work required for the installation will be performed, inspected, and accepted by an electrician licensed in the State of Georgia.

For works of improvement involving sub-contractors, the prime contractor must always have a representative on site monitoring the work of the sub-contractor.

B. Description of Project Site

The property is owned and operated by USDA NRCS Georgia Jimmy Carter Plant Materials Center located in Sumter County at 295 Morris Dr., Americus, GA 31719. The pumping station is located centrally to the property near the farm buildings, Latitude: N32o 6’13.05” Longitude: W84°15’34.42”. The pump station is supplied by overhead electric service to an above ground panel board. Georgia Power Company is the electric utility provider. See NRCS supplied materials outlined in Section G, Figure 1. Project Location Map.

The existing agricultural irrigation system is a Valley lateral move overhead irrigation equipped with low pressure drop nozzles and equipped to apply water variable rate. The sprinkler package in use is designed for 425 gpm.

C. General

All equipment and materials must be new and shall bear the manufacturer’s name and trade name. In cases where a standard has been established for a particular material, the material shall be so labeled. The equipment to be furnished will essentially be the standard product of a manufacturer regularly engaged in the production of the required type of equipment for this type of work and shall be the manufacturers latest approved design.

Electrical equipment, materials and workmanship must comply with all applicable codes, safety and fire law regulations at the location of the work and shall conform to applicable codes and standards of the organizations listed below.

1. National Electric Code (NEC)

2. National Electrical Manufacturers Association (NEMA)

3. American National Standards Institute (ANSI)

4. Underwriters Laboratories (UL 508)

5. International Electrotechnical Commission (IEC) For outdoor applications:

Depending on the design of the VFD unit, the described equipment shall be housed in one of two types when installed in outdoor applications.

VFD with external heat sinks VFD units with external heat sinks that are designed to be flange-mounted on the exterior of a cabinet may be mounted in such a fashion. A dust-tight, flanged-mounted seal shall be maintained, and a NEMA 3R rated rain hood shall protect the external heat sinks. The mounting cabinet shall be a single NEMA 3R or NEMA 4 free standing, power-coated steel enclosure of a wall thickness of not less than 0.075in. The enclosure shall be sized accordingly to allow easy access to components and provide adequate ventilation for the VFD. The enclosure may also include louvers and filter fans as required from heat loss calculations and average ambient temperatures. All louvers and filter fans shall conform to appropriate NEMA 3R or NEMA 4 or UL Type 3 or UL type 4 standards. Direct exposure of the VFD unit to un-filtered, outside air is not acceptable. Sun shielding of the enclosure shall be provided for on-site.

VFD without external heat sinks The described equipment shall be housed in a single NEMA 4 free standing, powder-coated steel enclosure of a wall thickness of not less than 0.075 inch. The enclosure shall be sized accordingly to allow easy access to components and provide adequate ventilation for the VFD. The enclosure shall include water/air heat exchangers, glycol/water heat exchangers, or air conditioners as required from VFD heat loss calculations and average ambient temperatures. Additional measures such as painting the enclosure white, installing a sun shield, and adding insulation to the inside of the enclosure shall also be considered as to prevent the temperature inside the enclosure from exceeding the acceptable VFD temperature limits. All components used, or modifications made, to the enclosure to aid in cooling must conform to NEMA 4 and applicable UL standards.

Control Circuit Wiring Control circuit wiring inside the panel shall be 18-gauge (AWG) minimum, type MTW or THW, rated for 600 volts. All power wiring shall be 12-gauge (AWG) minimum rated for 600 volts. Conductors shall be color-coded using the same colors throughout the entire panel.

Control circuit wiring shall be organized in snap-cover raceways. All wires shall be individually numbered or labeled at both ends. All wiring shall be done in a workman-like manner.

Schematics and Labeling As per UL and the NEC, all power input and output points of connection shall be clearly labeled. A detailed color schematic showing all control and power circuits shall be affixed to the inside of the panel door. In addition, a label displaying pre-programmed factory settings such as pressure set point shall be affixed to the inside of the panel door.

Safety Control panel construction methods shall consider provisions to ensure operator safety from electrocution. UL508A safety standards shall be observed. In addition, all terminals on power circuits carrying greater than 50V shall be made finger-safe if this provision does not already exist in the original component manufacturer’s design. This provision may be accomplished with the addition of appropriate safety shields over exposed terminals.

Pump/System protection The VFD shall have the following pump and system protection:

· Low Pressure

· High Pressure

· Low Water Input (low suction pressure/low level),

· Broken Pipe

· Loss of Prime

· Dry Well

· Feedback Loss Alarm & Pump Over-Cycling Motor/Drive Protection The Contractor will ensure the VFD protects the motor and the drive against the following conditions:

· Output Phase Loss

· Ground Fault

· Motor Overload

· Motor over-Temperature & Broken Shaft

· Over Voltage

· Input Phase Imbalance

· Under Voltage

· Phase Imbalance and

· Short Circuit protection.

D. Components

Following the Notice to Proceed, the Government will schedule a pre-work conference to be held on-site. The Contractor will conduct bi-weekly meetings via teleconference to provide status updates to the Contracting Officer (CO) and Contracting Officer Representative (COR) during the performance period.

The meeting minutes shall include the status of all submittals, requests for information (RFI), and decisions reached during conferences. The Contractor will furnish meeting minutes within seven (7) calendar days after each conference.

E. Project Closeout

System Demonstration and Training. The Contractor shall provide for the demonstration of the system to the Government upon satisfactory completion of the Work. The demonstration shall include operation of the system at full flow and reduced flow maintaining correct operating pressures.

In addition, a training session shall be provided to include an overview of the system operating capabilities, procedures, and troubleshooting.

Pump Station Signage. The Contractor will provide a weather-protected step by step instruction sheet to be placed near the pump controller at each pump station to provide guidance on how to execute the changeover to bypass mode.

Warranties. The Contractor will provide a minimum 1-year labor warranty on the installation and a 3-year manufacturer extended warranty on the new VFD.

Close Out Submittals. Provide cut sheets, pump curve, operation and maintenance plan, and warranties of all installed material in Adobe (pdf) format. Provide as-built plans in the form of red-lined project drawings showing location and size of all new equipment and piping.

F. Tasks

Tasks expected to be completed by the contractor are as follows:

1. Provide specifications for a VFD controller and appurtenances to operate in the pressure and flow ranges shown in Section A. Scope of Work, Table 1. The design package will include an operation and maintenance (O&M) plan for the PMC staff.

2. A QA/QC plan will be developed by the contractor.

3. Remove electrical disconnects and unnecessary hardware to install VFD. Modifications to existing panel board will be completed as needed for installation.

4. Install a new VFD, control panel, and appurtenances per manufacturer’s specifications.

5. Install a rain delay senor compatible with the irrigation system control panel.

6. Test for complete and proper operation. Results provided to PMC staff to verify operating parameters are met.

7. Program the irrigation controller to operate between 100 gpm and 425 gpm flow while maintaining design pressure of 17 psi at the lateral move system.

8. Provide an instruction sheet and onsite training to the Georgia NRCS PMC staff.

9. Provide as-built drawings, pump flow ranges, pump operating pressures, O&M plan for the new equipment, and contractor certification.

G. NRCS Supplied Materials and Point of Contact

Below is a list of materials NRCS will provide the Contractor for use in the design and development of the new VFD motor, and control panel. Contractor shall notify NRCS if it is determined any NRCS supplied materials are incomplete or any inaccuracies are found. NRCS supplied materials are to be used exclusively for this contract and in no case be disseminated to any other agency, contractor, or persons without direct written permission from NRCS.

1. Project Location Map

2. Photograph of pumping plant

3. Valley irrigation sprinkler design and run sheet

JCPMC

Americus, Georgia

April 2021

Figure 1. Project Location Maps

Figure 2. Photograph of JCPMC Pumping Plant.

Figure 3. Valley irrigation sprinkler design and run sheet image2.jpeg image3.jpeg image4.png image1.png