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Follow the links below to find material targeted to the unit's elements, performance criteria, required skills and knowledge

Elements and Performance Criteria

1. Analyse methods of improving plant efficiency
   • Increase in Rankine efficiency of plant by increasing the pressure and temperature is analysed
   • How regenerative feed heating and steam reheating increases overall plant efficiency is shown on an enthalpy/entropy diagram
   • Efficiency calculations and performance evaluation for boilers, turbines, feed systems and total plant are performed
2. Analyse changes in feed system that occur during fluctuating loads
   • Changes that occur during fluctuating loads are identified, detailing how make up to system and dump from system are performed
   • Condenser level control methods, how condenser is supported and how expansion stresses are avoided are explained
   • Loss of efficiency when heat transfer rate is interrupted is explained
   • Test procedure to identify leaks in a condenser is created
   • Types, features, common defects and maintenance requirements of two-stage and super cavitating extraction pumps are compared and contrasted
   • Effects of air leaks in feed system and ineffective air removal in air ejector are explained
   • Operation of a vacuum pump for air removal from a condenser is explained
   • Operation of a turbo feed pump differential pressure governor taking into account constant pressure, increasing pressure and decreasing pressure differential governing is explained
   • Alarms, shutdowns, automatic cut-in arrangements and testing of over speed trips for a boiler feed pump are outlined
3. Analyse design and construction of high-pressure water tube boilers and ancillary equipment
   • Temperature load relationships and temperature control of superheater are analysed
   • Operation of superheater with parallel, contra and cross flow of gas/steam flow is predicted
   • Correct material for high temperature operation of superheater tubes and headers is identified
   • Tube fixing and support arrangements for superheater elements are explained
   • Burner tip design and operation for steam atomising oil burners are compared
   • Features of a three-element water level control system and relationship with burner management system are outlined
   • Operation of a combustion control system fitted with cross limits on air and fuel is explained
4. Analyse operation, maintenance and performance of high-pressure water tube boilers and ancillary equipment
   • Warm through procedure and checks to be carried out before connecting boiler to range are explained
   • How boiler is laid up for short and/or long periods is explained
   • Actions required after oil or salt water contamination are detailed
   • Chemical cleaning procedure to remove scale and oil deposits from internal surfaces of a boiler is explained
   • Tube failures are identified and suitable methods of repair are selected
   • Defects that can occur in economisers and how they can be repaired are listed
   • Maintenance inspection procedures to prevent superheater and economise fires are produced
   • Procedure to combat soot and steam/iron fires in generating banks, superheaters and economisers is outlined
   • Coordinate and congruent feed water treatment is illustrated on a caustic/phosphate graph
   • Different feedwater tests, procedure for each test and appropriate chemical treatments are explained
   • Program for an internal and external survey of a water tube boiler is compiled, defects that may be found and repair methods that will enable boiler to be returned to service are listed
   • Procedure for setting lift, adjusting blow-down of safety valves and carrying out an accumulation test on a boiler is outlined
   • Operation, desired temperature range and correct cleaning and maintenance requirements for tube and regenerative air heaters are detailed
   • Preparation and procedure for conducting hydraulic testing of a high pressure water tube boiler is explained
5. Analyse turbine operation, maintenance and performance
   • Relationship between sequential nozzle operation and bar lift in steam turbines is explained
   • Principle of operation of different trips and cut-outs is explained
   • Differentiation is made between resonance and critical speed, and their effect on the turbine operation is explained
   • Types of turbine vibration and where each type is found in a turbine is analysed
   • System torsional vibration and effect of operating at critical speeds and in-built design elements required to avoid critical speeds are explained
   • Back pressure and self condensing turbo alternators are compared
   • Governor system is explained
   • Turbine control systems are explained
   • Procedure for opening up turbine for survey, routine checks of blades, casings, rotors, bearings, glands, drains and the reassembly of turbine is explained
   • Procedure for straightening a bowed turbine rotor is outlined
6. Evaluate turbine-gearing performance
   • Single and double reduction gearing systems are compared and contrasted
   • Features and applications of double helical involute gear teeth are outlined
   • Advantages and disadvantages of single and double locked train gearboxes are analysed
   • Construction and reason for installing flexible couplings in gearing system is explained
   • Features, functions and applications of star, planetary and solar epicyclic gearing are compared and contrasted
   • Space savings resulting from use of epicyclic gearing are analysed

Required Skills

Required Skills

Access diagnostic information related to marine steam turbines

Assess own work outcomes and maintain knowledge of current codes standards regulations and industry practices

Explain operation of marine steam turbines and impart advanced knowledge and ideas verbally in writing and visually

Identify and apply relevant solutions to complex problems that can occur during operating steam propulsion plant and associated systems on a steam vessel

Identify and interpret complex diagnostic information and perform complex mathematical calculations related to operating repairing and maintaining marine steam turbines

Identify methods procedures and materials needed for operating maintaining and repairing marine steam turbines

Read and interpret complex manuals technical specifications safety data sheets SDSmaterial safety data sheets MSDS and manufacturer guides related to operating repairing and maintaining marine steam turbines

Required Knowledge

Boiler operation maintenance and performance

Changes in feed system that occur during fluctuating loads

Established engineering practice and procedures for operating shipboard steam propulsion plant and associated systems in warm through manoeuvring start up normal running emergency and shut down situations

Fundamental principles of steam propulsion systems and boilers

Hazards and problems that can occur during operation of steam propulsion plant and associated systems and appropriate preventative and remedial action

Highpressure water tube boilers and ancillary equipment

Methods of lubricating principal components of a marine steam propulsion turbine and its associated gearing and evaluating common faults including common lubrication faults symptoms causes and actions to be taken with such faults

Operational characteristics and performance specifications for different types of steam propulsion plant and associated systems on a steam vessel of unlimited propulsion power

Principles of operation of main steam propulsion and auxiliary systems on a steam vessel including construction and operation of main and auxiliary steam turbines methods of turbine control including safety devices procedures for emergency operation of a steam turbine symptoms causes effects and actions to be taken of defects of auxiliary steam turbines

Procedures for reading and interpreting readings and indications of performance of steam propulsion plant and associated systems

Turbine operation maintenance and performance

Turbinegearing performance

Types properties tests applications and treatment of fuels lubricants and solventschemicals used on board a steam vessel including a basic understanding of working principles construction maintenance and safe operation of centrifuges filters and other treatment devices

Typical operating precautions for steam propulsion plant and associated systems to ensure operational performance is in compliance with bridge orders technical specifications survey requirements and established safety and antipollution rules and regulations

Units of measurement

Ways of improving plant efficiency

Work health and safety WHSoccupational health and safety OHS legislation and policies

Evidence Required

The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria the required skills and knowledge the range statement and the Assessment Guidelines for the Training Package
Critical aspects for assessment and evidence required to demonstrate competency in this unit	The evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the Elements Performance Criteria Required Skills Required Knowledge and include performing accurate and reliable calculations producing accurate and reliable information
Context of and specific resources for assessment	Performance is demonstrated consistently over time and in a suitable range of contexts Resources for assessment include access to industryapproved marine operations site where advanced knowledge of marine steam turbines and main boilers can be demonstrated diagrams specifications and other information required for performing complex calculations related to marine steam turbines technical reference library with current publications on marine steam turbines tools equipment and personal protective equipment currently used in industry relevant regulatory and equipment documentation that impacts on work activities range of relevant exercises case studies andor other simulated practical and knowledge assessments appropriate range of relevant operational situations in the workplace In both real and simulated environments access is required to relevant and appropriate materials and equipment applicable documentation including workplace procedures regulations codes of practice and operation manuals
Method of assessment	Practical assessment must occur in an appropriately simulated workplace environment andor appropriate range of situations in the workplace A range of assessment methods should be used to assess practical skills and knowledge The following examples are appropriate to this unit direct observation of the candidate demonstrating advanced knowledge of marine steam turbines and main boilers direct observation of the candidate applying relevant WHSOHS requirements and work practices
Guidance information for assessment	Holistic assessment with other units relevant to the industry sector workplace and job role is recommended In all cases where practical assessment is used it should be combined with targeted questioning to assess Required Knowledge Assessment processes and techniques must be appropriate to the language and literacy requirements of the work being performed and the capacity of the candidate

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Range Statement

The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below.
Trips and cut-outs may include:	Axial displacement Bearing high temperature High condenser level Loss of vacuum Over speed Vibration
Turbine vibration may include:	Axial Torsional Transverse
Turbine control systems may include:	Bridge control Emergency operation Hydraulic control Local control

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