supercharged, or turbocharged. The engine shall be 2- or 4-stroke-cycle
and compression-ignition type. The engine shall be vertical in-line, V- or
opposed-piston type, with a solid cast block or individually cast
cylinders. The engine shall have a minimum of two cylinders.
Opposed-piston type engines shall have not less than four cylinders. Each
block shall have a coolant drain port. Each engine shall be equipped with
an overspeed sensor.
2.3
FUEL SYSTEM
The entire fuel system for each engine-generator set shall conform to the
requirements of NFPA 30 and NFPA 37 and contain the following elements.
2.3.1
Pumps
2.3.1.1
Main Pump
Each engine shall be provided with an engine driven pump. The pump shall
supply fuel at a minimum rate sufficient to provide the amount of fuel
required to meet the performance indicated within the parameter schedule.
The fuel flow rate shall be based on meeting the load requirements and all
necessary recirculation.
2.3.1.2
Auxiliary Fuel Pump
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NOTE: The auxiliary fuel pump is required to
support the main pump if the length of pipe from the
day tank to the main pump is greater than the value
recommended by the engine manufacturer. This value
may be approximately 12 m (40 feet); however, engine
manufacturers should be consulted during design to
verify the pumping requirements.
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Auxiliary fuel pumps shall be provided to maintain the required engine fuel
pressure, if either required by the installation or indicated on the
drawings. The auxiliary pump shall be driven by a dc electric motor
powered by the starting/station batteries. The auxiliary pump shall be
automatically actuated by a pressure-detecting device.
2.3.2
A minimum of one full-flow fuel filter shall be provided for each engine.
The filter shall be readily accessible and capable of being changed without
disconnecting the piping or disturbing other components. The filter shall
have inlet and outlet connections plainly marked.
2.3.3
Relief/Bypass Valve
A relief/bypass valve shall be provided to regulate pressure in the fuel
supply line, return excess fuel to a return line and prevent the build-up
of excessive pressure in the fuel system.
2.3.4
Integral Main Fuel Storage Tank
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NOTE: Delete this paragraph if an integral main
fuel storage tank is not desired.
SECTION 16263A
Page 37
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