Elements and Performance Criteria
- Interpret an energy balance diagram for a shipboard steam plant
- Ideal theoretical thermodynamic cycle for the operation of a steam plant is outlined
- Why actual expansion of steam through a turbine differs from ideal cycle is explained
- Typical heat losses around a steam plant are identified
- Effect of air preheating, feed heating and economisation upon energy balance of steam plant’s thermodynamic cycle are explained
- Typical heat (and/or mass) balance diagram for a ship’s steam plant is interpreted
- Explain construction and operation of marine high-pressure water boilers
- Advantages of water tube boiler over fire tube boiler for shipboard applications are outlined
- Construction and operation of a ‘D’ type membrane furnace boiler with superheater, economiser and air pre-heater is explained
- External fittings required by Classification Society Rules on any large boiler are identified
- Internal fittings of a boiler’s main steam drum are identified
- How automation is applied to boiler control is clarified
- Start up, operation and shut down of a main propulsion steam boiler is outlined
- Explain construction and operation of a main propulsion steam plant
- How common forms of blading and rotor construction are manufactured is clarified
- How casings of common marine steam turbines are fitted out is clarified
- Principles of thermodynamics are applied to explain expansion of steam in a typical marine turbine
- Importance of start up and warming-through procedures for a steam turbine set is conveyed
- Checks required during routine turbine operation are explained
- Safety devices for a steam turbine set are identified and normal emergency shut-down procedures are identified
- Operation of turbines under normal and emergency conditions is outlined
- Explain auxiliary machinery required to support operation of main propulsion steam turbines and boilers
- Explain configuration and operating principles of different steam distribution systems used in steam-powered vessels
- Explain operation principles of close feed systems used by boiler/turbine sets
- Explain feed and boiler water treatment
- Recommended limits of characteristics for boiler water and recommended intervals at which tests are undertaken are clarified
- Reasons for treating boiler water are outlined
- Different types of hardness in water, their consequences if left untreated, and ways of minimising their effect are explained
- How corrosion within a boiler is minimised by treating boiler water is explained
- Causes and ways of avoiding carry-over and caustic embrittlement are explained
- Safety requirements for handling feedwater and boiler water treatment chemicals are explained
- Explain transmission of power from the steam turbine main engine to the propeller
- Why reduction gearing is required between steam turbines and propeller is clarified
- Generation of tooth form is outlined
- Double helical gearing and difference between single and double reduction gearing are explained
- Applications of epicyclic gearing are explained
- Function of flexible couplings in a turbine/gearing set is clarified
- Components of a driveline from main wheel connection, aft, to propeller are listed
- Methods and mechanisms for lubricating a driveline are detailed
- Explain procedures for preventing and responding to fires and explosions specific to steam propulsion plant
- Causes, symptoms and means of preventing and extinguishing fires associated with steam propulsion plant are detailed
- Protective devices associated with boilers to minimise risk of fires, explosions and water shortages are identified
- Routine inspection and maintenance requirements to prevent fires, explosions and water shortages are outlined