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Maintenance ONBOARD

  Types of Maintenance Procedures 1)   Preventive or Scheduled Maintenance System It is famously known as the PMS or Planned Maintenance System. In this type of system the maintenance is carried out as per the running hours like 4000 hrs, 8000 hrs etc., or by the calendar intervals like 6 monthly, yearly etc. of the machinery. The maintenance is carried out irrespective of the condition of the machinery. The parts have to be replaced if it is written in the schedule, even if they can be still used. 2)  Corrective or Breakdown Maintenance In this system, maintenance is carried out when the machinery breaks down. This is the reason it is known as breakdown maintenance. This is not a suitable and good method as situations may occur wherein the machinery is required in an emergency. The only advantage of this system is that the working of machinery parts is used to its full life or until it breaks. This system might get costly as during breakdown several other parts may also get damaged. 3
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Compressors Interview Questions And Answers

  What is meant by a single-stage double-acting reciprocating compressor?      In a double-acting air compressor, the air is admitted alternatively to both sides of the piston. When one side is performing the suction stroke, the other side will be performing compression & delivery of compressed air. Theoretically, a double-acting compressor will deliver twice the amount of compressed air compared to a single-acting compressor of the same size and speed. Define volumetric efficiency and clearance ratio Volumetric efficiency: Volumetric efficiency is defined as the ratio of the volume of free air sucked into the compressor per cycle to the stroke volume of the cylinder. Clearance ratio: Clearance ratio is defined as the ratio of clearance volume of swept volume (or) stroke volume. What are the drawbacks of single-stage compression?      The size of the cylinder will be too large. Due to compression, there will be a rise in air temperature and it will be difficult to reject the heat i
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Shaftline 1.rudder stock, 2.rudder, 3.propeller bonnet, 4.propeller, 5.stern frame, 6.stern tube sealing, 7.stern tube bearings 8.stern tube, 9.propeller shaft, tail shaft, 10.plummer Mock, pillow block, shaft block, 11.intermediate shaft, 12.thrust shafts 13.flywheel, 14.crankshaft, shaft alley, shaft tunnel,
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Development of superstructures on cargo ships FLUSH DECK SHIP THREE ISLAND TYPE COMBINED POOP AND BRIDGE RAISED QUARTER DECK AWNING OR SPAR DECK OPEN SHELTER DECK ALL AFT CARGO SHIP
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line diagram of engine

1 . Cylinder head 2. Super charge 3. Frame 4. rind 5. Fly wheel
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images about heat exchanger,purifier,rocker arm arrangement,diesel engine parts

heat exchanger Purifier Rocker Arm Arrangement Diesel Engine Parts
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Boiler

Marine Boilers Whether it is steam powered or has a diesel engine as the main form of propulsion , a ship without a boiler is really difficult to imagine. Boiler is an equipment that will be found on ship in some or the other form . For example if a ship is a steam powered ship, two or more boilers will be provided to produce steam having very high temperature and pressure; while if a ship is carrying a diesel engine as the main propulsion system, one or two smaller boilers are used for running various ship's machinery and services. So let us find out in this article as to how boilers work and what is their construction. How do Boilers Work? A basic boiler is a machine with the simplest arrangement of the internal parts. The main job of a boiler is to make high pressure steam. The feed water supplied to the boiler drum utilizes the heat of the energy released by burning the fuel . This energy of the burning fuel is stored in the form of steam with high temperature and pressure. T
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DIESEL ENGINE

The diesel engine source: Helmut Hütten, "Motoren", Motorbuchverlag Stuttgart, Umschlag Already early Rudolf Diesel (1858 - 1913) was interested in engines. In his youth he was fascinated by the engines of Lenoir and the steam engines that were usual at his time. During his study he learned of his teacher, professor Linde, a famous inventor, that the thermal engine could reach by far a better performance. He referred to the young Frenchman Sadi Carnot (1796 - 1832), who discovered the Carnot' cyclic process, a physical principle that describes the ideal process of the burn in an engine (read more about it in the physics section). Diesel was pursued from now on by the thought to build such an engine. 1890, Diesel had the crucial idea, how the cumbustion process could be improved: The engine takes in just air, which is to be compressed now to a pressure of about 200 bar. At this point, heavy fuel (such as crude oil or petroleum) gets injected by an injector in the air that
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FUEL INJECTION EQUIPMENT There are three methods commonly used for the mechanical injection of fuel (at the proper amount, time, and duration) into the cylinders of a diesel engine. These methods are as follows: 1. Pump controlled (jerk pump) 2. Distributor 3. Unit injector NOTE: A fourth method, known as pressure-time (PT) uses unit injectors. This method is unique to Cummins diesel engines and is not considered to be common; therefore, it will not be explained in this rate training manual. The three methods listed above will be explained in the sections that follow. JERK PUMP FUEL INJECTION SYSTEM Jerk pump fuel injection systems consist of high-pressure pumps and pressure-operated spray valves or nozzles that are separate components. In some engines, such as the Alco, there is only one pump and one nozzle for each cylinder. In other engines, such as the Fairbanks-Morse opposed-piston engine, each cylinder has two pumps and two nozzles. Most of the injection event is carried out by t
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Fresh Water Generator

Converting Seawater to Freshwater on a Ship: Fresh Water Generator Explained Fresh water generator , one of the important machinery on board a ship, is something that cannot be done without. Fresh water produced from fresh water generator is used for drinking, cooking, washing and even running other important machinery which use fresh water as a cooling medium. Fresh water is generally produced on board using the evaporation method. There are two things that are available in plenty on ship to produce fresh water –Seawater and heat. Thus fresh water is produced by evaporating sea water using heat from any of the heat source. The evaporated sea water is then again cooled by the sea water and the cycle repeats. Generally the heat source available is taken from the main engine jacket water, which is used for cooling the main engine components such as cylinder head, liner etc. The temperature available from this jacket water is about 70 deg. centigrade. But at this temperature the evaporati
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