NONSTANDARD DIESEL-ELECTRIC GENERATING PLANTS
10.1 Conditions for Nonstandard Plant Selection. Nonstandard plant types
may be considered for unusual conditions where definitive designs of
diesel-electric generating plants are not applicable.
10.2 Gasoline Engine Electric Generators. Where the weight and cost per
kilowatt is a predominant factor in selection of engine type, and where
fuel storage space is at a premium, gasoline-engine electric generators may
be considered for standby/emergency duty plants serving emergency loads in
capacities from 10 kW to 300 kW. Disadvantages of fire an explosion hazards
in closed spaces and requirements for special ventilation features should be
evaluated. Also, consider the poor storage qualities of gasoline fuels.
Refer to NAVFAC DM-22, Petroleum Fuel Facilities, for characteristics,
storing, and handling of gasoline. A life-cycle economic analysis is
10.3 Gaseous and Dual-Fuel Engines. Several considerations relating to the
fuel must be taken into account when designing nonstandard plants.
10.3.1 Gas Heating Value. Gaseous fuels include natural gas, and liquid
petroleum gases, such as propane. Digester gas may also be considered.
Prepare procurement specifications for gas and for dual fueled engines, when
gas is one of the fuels, using the lower heating value of the gas fuel.
Engine suppliers can provide guaranteed performance levels based on the
chemical and physical composition of the gas proposed to be used only if
such data is specified.
10.3.2 Wet Gas Treatment. Consult the engine manufacturer regarding proper
treatment of gasses containing liquid hydrocarbons (wet gas) when dry gas is
10.3.3 Gas Supply Shut-Off. The hazardous nature of gaseous fuels makes it
necessary to provide devices that shut off the gas supply immediately on
engine shutdown for any reason, including low fuel pressure or loss of
10.3.4 Gas Pressure. The designer should determine the gas supply
pressure. If it does not exceed the minimum requirements of the engine, a
booster compressor may be required between the supply and the gas engine.
Some gas burning and dual-fuel engines require uniform gas pressure. In
engine. It must be vented outdoors.