The stern tube bearing serves two important purposes. It supports the tail shaft (propeller shaft) and a considerable proportion of the propeller weight. It also acts as a gland to prevent the entry of sea water into the machinery spaces (engine room). F. Propeller It looks similar to a fan and consists of a boss with several blades of helicoidal form attached to it. When rotated it or thrusts its way through the water by ‘screws’ giving momentum to the column of water passing through it. General arrangement of an indirect drive, geared, medium speed diesel ( reversible by Sketch & describe the fuel oil system of a large main engine, indicating the important components and the flow directions. Ans: Sketch Description: The fuel oil is stored in double bottom tanks after bunkering. While proper steam heating is provided to increase the viscosity of iol if ship sails in tropical zones. Fuel oil from doublebottom tank is sent to transfer pump through subsequient valves . Transfer Pump A transfer pump normally is installed to move fuel oil from storage tanks to settling tanks. One positive displacement transfer pump, protected by suction strainers and a pressure relief valve, and a pump bypass line, is normally fitted. The transfer pump flow rate is dependent upon engine fuel consumption rate and service and settling tank size. Settling tank They provide a settling function for gross water and solids, a heating function, a deaeration function, and a thermal stabilizing function. Ships’ settling tanks are designed to accept fuel oils with a 60 degrees Centigrade minimum flash point. As soon as a settling tank is filled, it is heated to 72 degrees Centigrade, or 6 degrees Centigrade below the flash point, whichever is lower. The tanks should be insulated where possible to reduce
The stern tube bearing serves two important purposes. It supports the tail shaft (propeller shaft) and a considerable proportion of the propeller weight. It also acts as a gland to prevent the entry of sea water into the machinery spaces (engine room). F. Propeller It looks similar to a fan and consists of a boss with several blades of helicoidal form attached to it. When rotated it ‘screws’ or thrusts its way through the water by giving momentum to the column of water passing through it. General arrangement of an indirect drive, geared, medium speed diesel ( reversible by Sketch & describe the fuel oil system of a large main engine, indicating the important components and the flow directions. Ans: Sketch Description: The fuel oil is stored in double bottom tanks after bunkering. While proper steam heating is provided to increase the viscosity of iol if ship sails in tropical zones. Fuel oil from doublebottom tank is sent to transfer pump through subsequient valves . Transfer Pump A transfer pump normally is installed to move fuel oil from storage tanks to settling tanks. One positive displacement transfer pump, protected by suction strainers and a pressure relief valve, and a pump bypass line, is normally fitted. The transfer pump flow rate is dependent upon engine fuel consumption rate and service and settling tank size. Settling tank They provide a settling function for gross water and solids, a heating function, a deaeration function, and a thermal stabilizing function. Ships’ settling tanks are designed to accept fuel oils with a 60 degrees Centigrade minimum flash point. As soon as a settling tank is filled, it is heated to 72 degrees Centigrade, or 6 degrees Centigrade below the flash point, whichever is lower. The tanks should be insulated where possible to reduce
ELECTRICAL%20&%20ELECTRONICS%20ENGIEERING%20-%20EEE(M).docx