MARL6022A - Demonstrate advanced knowledge of marine steam turbines and main boilers
Assessor Resource
MARL6022A Demonstrate advanced knowledge of marine steam turbines and main boilers
Assessment tool
Version 1.0 Issue Date: April 2024
This unit applies to the work of a Marine Engineer Class 1 on commercial vessels of unlimited propulsion power and forms part of the requirements for the Certificate of Competency Marine Engineer Class 1 issued by the Australian Maritime Safety Authority (AMSA).
This unit involves the skills and knowledge required to operate and maintain main steam propulsion plant and associated control systems on a commercial vessel. It includes analysing: methods of improving plant efficiency; changes in feed system that occur during fluctuating loads; design and construction of high-pressure water tube boilers and ancillary equipment; operation, maintenance and performance of high-pressure water tube boilers and ancillary equipment; turbine operation, maintenance and performance; and turbine-gearing performance.
You may want to include more information here about the target group and the purpose of the assessments (eg formative, summative, recognition)
Prerequisites
Not applicable.
Employability Skills
This unit contains employability skills.
Evidence Required
List the assessment methods to be used and the context and resources required for assessment. Copy and paste the relevant sections from the evidence guide below and then re-write these in plain English.
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:
industry-approved 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 and/or 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.
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 WHS/OHS 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.
Submission Requirements
List each assessment task's title, type (eg project, observation/demonstration, essay, assingnment, checklist) and due date here
Assessment task 1: [title] Due date:
(add new lines for each of the assessment tasks)
Assessment Tasks
Copy and paste from the following data to produce each assessment task. Write these in plain English and spell out how, when and where the task is to be carried out, under what conditions, and what resources are needed. Include guidelines about how well the candidate has to perform a task for it to be judged satisfactory.
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 (SDS)/material 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
High-pressure 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
Turbine-gearing performance
Types, properties, tests, applications and treatment of fuels, lubricants, and solvents/chemicals 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 anti-pollution rules and regulations
Units of measurement
Ways of improving plant efficiency
Work health and safety (WHS)/occupational health and safety (OHS) legislation and policies
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
Copy and paste from the following performance criteria to create an observation checklist for each task. When you have finished writing your assessment tool every one of these must have been addressed, preferably several times in a variety of contexts. To ensure this occurs download the assessment matrix for the unit; enter each assessment task as a column header and place check marks against each performance criteria that task addresses.
Observation Checklist
Tasks to be observed according to workplace/college/TAFE policy and procedures, relevant legislation and Codes of Practice
Yes
No
Comments/feedback
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
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
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
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
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
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
Forms
Assessment Cover Sheet
MARL6022A - Demonstrate advanced knowledge of marine steam turbines and main boilers
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Assessment Record Sheet
MARL6022A - Demonstrate advanced knowledge of marine steam turbines and main boilers
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