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Diesel engines have higher thermal efficiencies than other commercial prime movers of comparable size. Diesel engine-generators are applicable to electric loads. from about 10 to 5000 kilowatts. Diesel engine- driven electric generator sets are divided into three general categories based on application as follows: (1) Class A: Diesel-electric generator sets for stationary power plants generating prime power continuously at full nameplate kW rating as the sole source of electric power. (2) Class B: Diesel-electric generators sets for stationary power plants generating power on a standby basis for extended periods of time where months of continuous operation at full nameplate kW rating are anticipated. Engines and engine-generator sets are normally provided with the primary subsystems necessary for engine operation, such as: (1) Starting system. (2) Fuel supply and injection system. (3) Lubrication system and oil cooling. (4) Primary (engine) cooling system. (5) Speed control (governor) system. (6) Required instrumentation. d. The designer must provide for the following (1) Intake air. Balance of plant systems are those which must be provided and interfaced with a packaged diesel or diesel-generator set to provide an operational generating unit. Water-to-water systems. Jacket water and lube oil cooling heat exchangers are cooled by a secondary circulating water system. Normally, a recirculating system will be used. Heat is dissipated to the atmosphere through an evaporative, mechanical- draft cooling tower. If the plant is located on or near a body of water, once-through circulating water will be evaluated. Bidders will be informed of the type and source of secondary water used so heat exchangers can be designed for their intended service. Fuel storage and handling a. Storage requirements. (1) Aboveground fuel storage tanks with a minimum capacity for 30 days continuous operation will be provided for continuous and standby duty plants. Fuel storage shall be designed to the requirements of NFPA 30. A tank with 3 day storage capacity will be provided for emergency duty plants.
Tags:diesel engine generators, stationary power plants, fuel storage tanks, electric generator sets, aboveground fuel storage tanks
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