AUXILIARY ENGINES – questions • Which auxiliary engines does the text mention? • Which types of pumps are mentioned in the text and what are their purposes? • What is the difference between a single-acting and a double acting reciprocating pump? • The text also mentions a number of valves. What are they and what are their purposes? • What is the purpose of the anchor winch? • What is the purpose of warping drums at the extremities of the intermediate shaft? • What is the purpose of the steering engine? • What is the purpose of the exhaust gas boiler? • What is the purpose of generators? • What is the purpose of electric motors?
AUXILIARY ENGINES – answers • Pumps, the anchor winch, the steering engine, the exhaust gas boiler, generators and electric motors. • Pumps (by purpose): • general service pumps (various purposes, e.g., for domestic use), • ballast pumps (trimming), • fresh water pumps (to provide water for cooling systems), • fire pumps (to extinguish fire), • fuel pumps (to supply the fuel for the engine), • lubricating oil pumps (to supply the lubricant for the lubrication of engine parts), • bilge pumps (to drain superfluous liquids). Pumps (by type): • Displacement pumps (reciprocating pumps and gearwheel pumps) and centrifugal pumps.
AUXILIARY ENGINES – answers • Single-acting reciprocating pump: the liquid is drawn when the piston goes up and is forced out when the piston goes down. Double-acting reciprocating pump: there is simultaneous suction and discharge actions. • Valves: • non-return valves (bilge pumps): prevent the liquid from flowing back. • discharge valve (reciprocating pump): through this valve liquid is emptied from the pump chamber. • suction valve (reciprocating pump): allows the liquid to enter the pump chamber. • To drop, heave in and pay out the anchor. • To pick up any slack and keep the ship’s lines tight. They are also used to shift the vessel’s berth.
AUXILIARY ENGINES – answers • To turn the rudder (allowing the ship to make an alteration of course). • Use the waste heat of exhaust gasses to turn water into steam (then used for heating or driving generators that produce electricity – used to drive auxiliary engines or for the lighting system). • To provide electric power to the lighting system, auxiliary engines, cranes, derricks, hatches or for domestic use. • To actuate pumps, winches, derricks, etc.