Pgh generator requirements.docx

The Contractor shall provide a submittal of the generator with the vendor’s sizing software. Information for loading the generator will be taken from the one-line. Two items must be addressed: startup inrush current and demand load. Manufacturers of generators incorporate various amounts of copper wiring in the alternator, two different means of control (permanent magnet generators or self-excited DC generators) and other reasons for different sizes to take care of motor inrush current. If the inrush current cannot be controlled, another manufacturer should be chosen. Getting a larger generator than the one approved will require re- approved by AFCEC. This approval process may take four months or more.

Each compression ignition internal combustion engine must be optimized to run on diesel fuel containing a maximum of 15 ppm of sulfur content.

2.2 Emission Requirements

The model year of each generator shall be certified by the manufacturer to meet Tier 4 emission standards and the emissions standards contained within 40 CFR 60. 4201 or 40 CFR 60.4202, respectively (40 CFR 60 Subpart IIII - Standards of Performance for Stationary Compression Ignition Internal Combustion Engine [CI ICE]). Provide EPA Certificates of Conformity to EPA requirements for the model year of the engine procured.

Provide a main breaker with the generator. Breaker shall be sized a minimum of 125% of the generator rated capacity and no more than 200% of the rated capacity.

· For 2000 Amps and greater, use large draw-out breakers with solid state tripping units.

· For 1800 Amps to 900 Amps, use insulated-case or molded-case breaker with solid state tripping units.

· Breakers 1000 Amps and above shall have ground fault protection.

· For 800 Amps or less, the breaker shall be a standard molded case breaker.

Control panel for the generator shall provide the following outputs and provide a single point that personnel can determine the overall operational status of the generator.

· On-off: Provide a means of turning the generator on-off. In the “off” position, it will not auto start. In the “on” position, the generator will respond to the Automatic Transfer Switch (ATS) and crank up and run as the ATS signals it.

· The controller will also allow the generator to be cranked and run without engagement from the ATS for maintenance purposes.

· No controls or software shall be installed to automatically run the generator at specified intervals; any such controls that exist, shall be deactivated.

3.2.2 Gauges

Gauges/readings can be an electronic screen with means to select between the different readings. The following gauges shall be included:

· Oil pressure and water temperature

· Exhaust temperature

· AC metering – Volts, Amps, Hertz

· Phase selector switch (3 phase)

· Hour meter (non-resettable)

3.3 Radiator

Provide a radiator that is integral to the prime mover skid package.

When a generator is to be installed inside or within three (3) feet of fences/structures that block airflow, provide a pass through ventilation system. The exhaust opening shall be the same size or larger than the radiator screen and shall be placed immediately in front of and aligned with the radiator. Provide louvers and bird screen for the opening. Offsets may be provided if ductwork is provided to direct airflow through the opening.

The generator shall have a muffler designed to limit the noise to the local noise standard requirements.

If the generator is installed inside, the muffler shall be mounted horizontally and shall have heat shielding material installed to keep the temperature rise in the room at a minimum. Under the heat shielding material, calcium silicate shall be installed around the muffler in the same manner as around exhaust piping.

If the generator is installed outside, the muffler may be mounted horizontally or vertically.

If the muffler is outside or on top of or inside a NEMA 3R enclosure insulation is not required.

3.4.2 Piping

Exhaust piping shall be routed from the generator to the muffler to a point outside the facility.

Provide a minimum of 1” of calcium silicate insulation around piping with binders on nine (9)-inch centers. Then place a two (2)-inch calcium silicate insulation around the one (1)-inch insulation just applied with all seams and joints staged so they do not match. Place binders on nine (9)- inch centers.

Include a penetration spacer at the point of wall penetration. Immediately upon exiting a wall, the pipe shall be turned upwards. Install lengths of pipe so that the top of the pipe is at least two

(2) feet above the highest point of roof within 10 feet of the pipe. Provide a brace from the pipe attached to a point just below roof level. Avoid roof penetrations if possible. If roof penetration cannot be avoided, provide design for penetration and roof installation around the pipe.

When exhaust point from muffler is within 10 feet of a facility, route the piping from the muffler upwards to at least two (2) feet above the highest point of roof. Provide a brace from the pipe attached to a point just below roof level. No insulation is required on the piping.

When exhaust point is more than 10 feet from a facility, route the piping from the muffler pointed away from building. If the muffler is less than 10 feet high, route the pipe upwards to a point on the wall at least 10 feet above ground level, then point away from building.

If the generator is installed in a courtyard or alleyway with high roof lines on at least two sides, provide piping to reach a point two (2) feet above the roof height close to the generator.

Do not locate exhaust piping exhaust point within 20 feet radius of any supply/return air vent on adjacent buildings.

Provide spacers so that the exhaust piping is no closer than six (6) inches to structure when it is routed up a wall or other structure.

3.4.3 System

Each exhaust system from the generator shall be topped with a flap. The flap shall be equal or larger diameter than the piping and shall be gravity operated to close. The operating mechanism shall be free enough to allow the flap to open at least to a 45 to 60 degree angle during exhaust flow.

Provide a temperature sensor in the exhaust system with a gauge in the control panel.

Diesel is the fuel of choice for stand-by power generation at AFRC locations. Use of natural gas (NG), liquid petroleum gas (LPG), or bio-diesel fuels is not permitted. Primary fuel tanks shall be placed above ground, should be integral to the generator enclosure and located no closer than 5 feet from any building or structure. Below ground storage tanks are not permitted.

Fuel tanks shall be sized to provide a 24 hour running time for the generation at 100% rated load.

Fuel tanks shall have double steel walls with interstitial concrete filler that complies with the following specifications. Provides secondary containment, leak monitoring, spill containment and overfill protection

· Provides lockable containment for filling operations

· UL 2085 listed – Protected Aboveground Tank for Flammable and Combustible Liquids

· Inner Tank shall be fabricated from minimum 3/16 inch steel and UL-142 listed – Steel Aboveground Tank for Flammable and Combustible Liquids

· Provides a minimum two-hour fire rating

· Fittings and protrusions are stainless steel

4.2.2 Fuel Tank Alarm Panel

A separate alarm panel shall be provided for each fuel tank with the following indicators:

· High Fuel Level red alarm lamp (labeled High)

· Low Fuel Level red alarm lamp (labeled Low)

· Tank Leak red alarm lamp (labeled Leak)

· Push To Test pushbutton

· Push To Reset pushbutton

· Push To Silence Alarm Horn pushbutton

· 90dB audible alarm horn Include an interstitial leak monitoring system to monitor tank leakage from the tank into the secondary compartment.

Fuel tanks shall be equipped with the following safety devices

· A visual indication of fuel level

· Automatic control of low and normal level of fuel into the tank

· A secondary automatic shut off of fuel delivery into tank at the 95% fill level

· Low level alarm in the event of failure of fuel supply system

· Grounding via #4 bare copper wire to the frame of the generator (both tank and fuel cooler)

· Normal vent pipe to outside that reaches a point that is 10 to 14 feet above ground level

· Pressure lifted emergency vent cap

· Anti-siphoning devices to prevent siphoning of fuel back into the tank Pittsburgh generator requirements of