Main Machinery Components
Main Engines – two Winton 6-cylinder in-line diesel engines produce 380 hp (280 kW) each at 300 rpm create the power that is converted into direct electric current. Engines are two-cycle and have fresh water cooling by a sea water heat exchanger.
Generators – two General Electric direct current generators of 250 kilowatts each connected to the main engines create the electricity that is delivered to the main propulsion motor.
Exciters – two General Electric exciters are located aft of each generator, directly connected to a diesel engine. Exciters induce a current in the rotating armature of the generators.
Switchboard – one General Electric deadfront switchboard controls the creation of electricity by the generators and the delivery of electricity to the motor.
Motor – one General Electric 600 hp (450 kW) DC electric motor with armatures, directly connected to the propeller shaft turns the propeller shaft and the propeller. The motor is controlled directly from the steering stations.
Propeller – one iron, four-bladed propeller.
Compressors – two compressors and four compressed air storage tanks are used to crank-start the diesel engines prior to the introduction of diesel fuel. Luna's horn is also air-powered.
Pumps – Luna is equipped with various pumps including a fuel transfer pump to shift fuel from one fuel tank to another and to a day tank, a bilge and salvage pump to pump water from the tug and from barges and ships in case of an emergency, and a fire pump to deliver water to several hydrants for fire-fighting and deck washing. Galley water is delivered by hand pump.
Batteries – a set of batteries is installed to store emergency electric power for lighting and starting the compressors.
Condensers – salt water/fresh water condensers are installed port and starboard to cool the fresh water that is circulated through the diesel engines to cool the engine blocks. The fresh water loops are surrounded by circulating sea water.
Steering Engine – is an electro-hydraulic motor-driven winch that takes directions from the steering wheel and pulls a steering cable connected through pulleys to the tug's rudder from port to starboard.
Read more about this topic: Luna (tugboat), Specifications
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