Draft Statement of Work.pdf

Savannah Bluff Lock and Dam Generator relocation Scope of Work

1. Summary of Work

The Contractor shall replace the existing 50 kW diesel generator, diesel fuel tank and automatic transfer switch (ATS) with a new generator, new fuel tank and ATS The existing generator set, fuel tank and ATS located in the Lock Operations Building shall be demolished, removed and disposed of by the Contractor. The existing diesel fuel tank is located on the first floor of the Lock Operations Building behind a chain-link fence. The existing generator set and ATS are located on the second level of the Lock Operations Building. A new propane-fueled generator set, propane fuel tank and ATS shall be provided and installed on the land-side pavilion between the Lock Operations Building and the public parking area. The new generator, fuel tank, and ATS shall be located on a new elevated equipment pad constructed adjacent to the existing service transformer.

2. Mechanical Demolition and Installation Requirements

a. Remove existing diesel fuel tank. Cap and evacuate existing associated piping.

b. Provide new elevated equipment pad for the new ATS, generator, and associated aboveground fuel tank. Foundation for fuel tank shall be designed to accommodate weight of the tank filled with water in case of any future hydrostatic testing. Install tank on elevated equipment pad with support saddles.

c. Provide a new propane fuel tank sized at a minimum of 1150 gal storage volume for new generator. Fuel tank is sized for full volume containing 80% liquid propane and 20% vapor for a week of run time for chosen generator at 75% load. Fuel tank shall meet requirements in NFPA 58 and API Std 2510. Ensure that tanks are ASME coded and have the ASME national registration number.

d. Ground and bond all piping, tanks, and system components in accordance with API RP 2003, API Std 2510, API RP 540, and NFPA 70.

e. Fence the storage area to restrict access for pedestrians and vehicles. The fence shall have a main entrance gate and a second gate on the opposite fence from such gate for emergency exit. At fence openings, provide a remote shutoff station for the emergency shutoff valves. The fence area shall have anti-vehicle barricade posts to protect tanks from an accidental collision from vehicles or equipment.

f. Tank shall be located for vehicle access for refueling and at least 75 feet away from the main building.

g. Provide means to automatically shut off the LPG supply in the event of a fire per NFPA.

Provide emergency shut-off consisting of the combination of manual shut-off, remote shut-off, and thermal shut-off modes.

h. Provide automatic limit switches as follows:

i. Pressure switches on storage tanks set 5 psig (35 kPa) below relief valve settings.

ii. Liquid level switches on storage tanks set at maximum filling levels.

iii. Liquid level switches on knock-out drums set to shut off compressor at high liquid levels.

iv. High pressure switches in compressor discharges to shut off compressor at safe pressure levels.

i. Provide automatic temperature, pressure, and limit controls on vaporizers in accordance with NFPA 58.

j. Provide pipe, valves, and fittings in accordance with applicable sections of API Std 2510.

Use Schedule 80 welded carbon steel. Threaded connections are only allowed for valves and system components. The minimum design pressure for liquid LPG piping is 350 psig (2400 kPa) as required by NFPA 58. Use Class 300 ANSI flanges as a minimum. Provide totalizing-type meters, pressure gauges, thermometers, strainers, and surge suppressors. Ensure that meters are turbine-type with pressure and temperature compensation and have electronic/digital readout capability. Provide knock-out drums or scrubbers of suitable capacities in suction lines of compressors to remove entrained liquid. Provide drums with high level, shut-down devices, automatic liquid drainers, glass gauges, and drains. Ensure all valves are UL listed or FM approved for LPG service. At a minimum, use Class 300 valves.

k. Inspect, test, and certify all new unfired pressure vessels prior to placing into operation.

Do not operate the unfired pressure vessel (UPV) without a valid certificate. The inspector must be registered by the National Board of Boiler and Pressure Vessel Inspectors (NBBI) and must possess a Certificate of Competency and a NBBI National Board Inspection Code (NBIC) Commission. Upon completion and passing of the inspections and tests, the tank will be certified. Post a current, valid certificate on or near the UPV under a protective coating. Perform the following tests on the UPV:

i. A general UPV site inspection

ii. An external UPV inspection

iii. An internal UPV inspection

iv. A hydrostatic test (strength and tightness tests)

v. An operational test

3. Electrical Demolition and Installation Requirements

a. The Contractor shall demolish and remove the existing 50 KW generator, existing 400 A automatic transfer switch (ATS) and existing ATS service conductors, and the feeder to the Main Distribution Panel (MDP). This includes but is not limited to all conductors, junction boxes, control panels, electrical devices, connectors, safety switches, overcurrent protection devices, conduit, wiring and, other devices associated with the ATS and generator. The existing service conductors shall be disconnected from the transformer secondary by Georgia Power Company (GPC). The Contractor shall contact and coordinate with GPC directly for the disconnection of the service conductors.

b. Provide a new 4-Pole, service entrance rated, 600V, 150A ATS. The ATS shall have a 150A thermal-magnetic circuit breaker on the normal feeder. The ATS and circuit breaker shall have 22k withstand and AIC rating, respectively. The ATS shall have a NEMA 3R enclosure and shall be pad mounted. The ATS shall be located adjacent to the existing utility service transformer. The contractor shall provide a grounding electrode, grounding electrode conductor (GEC), and bonding jumper at the ATS. Ground rods shall be copper-clad steel, with minimum diameter of ¾ inch and a length of 10 feet. Provide additional ground rods as required to achieve 25 ohms or less. The GEC and bonding jumper shall be #6 copper conductors.

c. The new generator shall be an optional, stand-by generator, 50 kW, 277/480 Volt with a generator-mounted, 100A thermal-magnetic circuit breaker as an integral part of the generator set assembly. The generator shall be pad mounted and located adjacent to the existing utility service transformer. The contractor shall provide a grounding electrode, grounding electrode conductor (GEC), and bonding jumper at the ATS.

Ground rods shall be copper-clad steel, with minimum diameter of ¾ inch and a length of 10 feet. Provide additional ground rods to achieve 25 ohms or less. The GEC and bonding jumper shall be #8 copper conductors.

ENGINE GENERATOR PARAMETER SCHEDULE

Service Load 50 kW

Power Factor 0.8 lagging

Motor Starting kVA (maximum) kVA

Maximum Speed 1,800 rpm

Engine-Generator Application

Emergency Standby Duty

Engine Cooling Type Water/Water

Heat Exchanger Type Tube Type

Voltage Regulation (No load to full load)

+ 2 percent (max.)

Voltage Bandwidth (steady state)

+ 5 percent (max.)

Frequency Regulation (droop) (No Load to Full Load)

+ 5 percent (max.)

Frequency Bandwidth (steady state)

+ 0.4 percent (max.)

Frequency 60 Hz

Voltage 480V volts

Phases 3 Phase

Max Step Load Increase 100 percent of Service Load at 0.8 PF

Max Time to Start and be Ready to Assume Load

10 seconds

Minimum Fuel Pump Suction Lift

108 inches

Max Summer Indoor Temp 110 deg. F

Min Winter Indoor Temp 20 deg. F

d. The contractor shall provide new underground service conductors from the existing transformer to the new, pad mounted ATS. The service conductors shall be a 4 wire #1/0 THWN copper. All underground conductors shall be in 2” PVC conduit. The new service conductors shall be terminated on the transformer secondary by Georgia Power.

e. The contractor shall provide new underground feeder conductors from the new pad mounted ATS to the new generator. The feeder shall be a 4 wire #3 + #6G THWN copper conductors. All underground conductors shall be in 1-1/2” PVC conduit.

f. The contractor shall provide new aerial feeder conductors from the new ATS to the existing Main Distribution Panel (MDP) located on the second floor of the Lock Operations Building. The new MDP feeder shall be a 4 wire #1/0 + #6G XLP copper conductors. The feeder shall be approximately 250 feet in length. All wiring installed inside the Lock Operations Building shall be in 2” EMT conduit.

g. The contractor shall provide all labor, materials, tools, and support equipment as required. This includes but is not limited to all conductors, junction boxes, control panels, electrical devices, connectors, conduit, riser pole, and wiring required to replace the service conductors, ATS, and generator. All interior wiring shall be in EMT conduit.

h. All electrical work shall meet the requirements of NFPA 70. All electrical equipment and devices shall be UL Listed. This includes but is not limited to all conductors, junction boxes, control panels, electrical devices, connectors, conduit, riser pole, and wiring required to replace the service conductors, ATS, and generator.

i. The contractor shall preform operational testing of the ATS and generator.

i. Perform automatic transfer tests

1. Simulate loss of normal

2. Return to normal

3. Manufacturer recommended tests.

ii. Verify correct operation and timing of the following functions:

1. Normal source voltage-sensing relays.

2. Engine start sequence.

3. Time delay upon transfer.

4. Alternate source voltage-sensing relays.

5. Automatic transfer operation.

6. Interlocks and limit switch function.

7. Time delay and retransfer upon normal power restoration.

j. The contractor shall test the generator and ancillary systems at service load to demonstrate durability; verify that heat of extended operation does not adversely affect or cause failure in any part of the system; and check all parts of the system. The tests must be performed by the start-up engineer. Upon successful test completion, the start-up engineer must provide a written test report showing the tests performed and the results of each test. The report must include the completed approved test data forms and certification from the start-up engineer that the test results fall within the manufacturer's recommended limits and meet the specified requirements performance.

Testing must include, but not be limited to, the following:

i. Verify proper functioning of each engine protective shutdown device and pre-shutdown alarm device.

ii. Verify proper functioning of the engine over-speed trip device.

iii. Verify proper functioning of the crank cycle/terminate relay.

iv. Operate the engine-generator set at rated current (amperes) until the jacket water temperature stabilizes. Stabilization will be considered to have occurred when three consecutive temperature readings remain unchanged.

Continue to operate the generator set for an additional 2 hours. Record instrument readings for terminal voltage, line current, frequency (Hz), engine speed rpm, lubricating oil pressure, jacket water temperature, and ambient temperature at 5 minute intervals for first 15 minutes and at 15 minute intervals thereafter.

v. Verify proper functioning of the following automatic and manual operations.

Testing must include, but not be limited to, the following:

1. Loss of Utility: Initiate a normal power failure with connected test load of rated kW at 1.0 power factor. Record time delay on start, cranking time until engine starts and runs, time to come up to operating speed, voltage and frequency overshoot, and time to achieve steady state conditions with all switches transferred to emergency position.

2. Return of Utility: Return normal power and record time delay on retransfer for each automatic transfer switch, and time delay on engine cool-down and shutdown.

3. Manual starting.

4. Emergency stop.

vi. Manufacturer recommended tests.