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TermDefinition
main engine generally refers to the propulsion diesel engine that propels a ship
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controllable pitch propeller a propeller with blades that can be rotated in position to achieve ahead, astern or neutral thrust, the main engine only needs to run in a constant direction; also known as variable pitch propeller or CPP for short
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engine room a machinery space where the main engine and its supporting machinery are sited
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exhaust gas boiler boiler that relies solely on exhaust gas generated by main engine to produce steam during voyage
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fresh water generator equipment for producing fresh water from sea water during voyage; it may use the waste heat from main engine's jacket cooling water to evaporate sea water in a vacuum condition and then condensing the steam to produce distilled water
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service tank fuel tank provided in machinery space of motor vessel from which main engine directly draws its daily fuel consumption; heating of fuel oil by steam heating coils serves to maintain the fuel at working temperature; usually its fuel is continuously fed from purifier taking suction from the settling tank; use of purifier helps to accelerate the separation of water and solid contaminants by centrifugal force from the fuel
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shaft generator generator driven by main engine's shaft through appropriate gearing during voyage to produce electric power; part of measure to reduce fuel cost
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telegraph on a ship, it is a device with a lever for transmitting and acknowledging remotely the orders for engine movements; fitted in the wheel house where the order is given during manoeuvring, the engineers in the machinery space then acknowledge the order and adjust the main engine speed accordingly; the order may vary in steps from "Dead Slow", "Slow" and "Full" Ahead or Astern
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turning gear mechanism for rotating the crankshaft of main engine during engine overhaul or engine preparation before starting; the electric motor-driven gear has arrangement to engage or disengage the shaft
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