MARL052 — Demonstrate advanced knowledge of marine steam turbines and main boilers

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What an assessment for MARL052 must cover

155 assessable components: 10 elements (85 performance criteria), 9 performance evidence and 61 knowledge evidence requirements. An audit-defensible tool maps every question and task back to these — that mapping is the coverage matrix Auditori generates alongside the assessment.

Elements & performance criteria

1 Analyse methods of improving plant efficiency

1.1Heat losses in a turbine and turbine system are analysed
1.2An enthalpy/entropy diagram is used to show how steam properties change through a turbine
1.3The effect air heaters and economisers have on turbine plant efficiency is explained
1.4Increase in Rankine efficiency of plant by increasing the pressure and temperature is analysed
1.5How regenerative feed heating and steam reheating increases overall plant efficiency is shown on an enthalpy/entropy diagram
1.6Practical methods of verifying energy losses are detailed

2 Explain construction and operation of feed system

2.1Operation and components of the complete feed system are outlined
2.2Construction, operating principles and maintenance requirements of a regenerative condenser are explained
2.3Causes of loss of vacuum are identified and test procedure to identify leaks in a condenser is created
2.4Construction and operation of air ejectors, vacuums and extraction pumps are explained
2.5Construction and operation of gland condensers, low-pressure heaters, drain coolers and high-pressure heaters are explained
2.6General arrangement and construction of turbo feed pumps is outlined
2.7Operating principles and construction details of de-aerators are explained

3 Analyse changes in feed system that occur during fluctuating loads

3.1Changes that occur during fluctuating loads are identified, detailing how make up to the system and dump from the system are performed
3.2Condenser level control methods, how condenser is supported and how expansion stresses are avoided are explained
3.3Loss of efficiency when heat transfer rate is interrupted is explained
3.4Types, features, common defects and maintenance requirements of two-stage and super cavitating extraction pumps are compared and contrasted
3.5Operation of a vacuum pump for air removal from a condenser is explained
3.6Operation of a turbo feed pump differential pressure governor taking into account constant pressure, increasing pressure and decreasing pressure differential governing is explained
3.7Alarms, shutdowns, automatic cut-in arrangements and testing of over speed trips for a boiler feed pump are outlined

4 Analyse design and construction and repair of high-pressure water tube boilers and ancillary equipment

4.1Various propulsion boiler designs are compared
4.2Operating principles and construction methods of integral and external superheaters are explained
4.3Drum, internal fittings and support and expansion arrangements are outlined
4.4Procedures for repairing a membrane wall furnace are clarified
4.5Operating principles of high-pressure boilers, including water and gas flow circulation, are explained
4.6Temperature load relationships and temperature control of superheater are analysed
4.7Operation of superheater with parallel, contra and cross flow of gas/steam flow is predicted
4.8Correct material for high temperature operation of superheater tubes and headers is identified
4.9Construction and operation of economisers and air heaters is explained
4.10Chemistry of combustion is explained
4.11Burner tip design and operation for steam atomising oil burners are compared
4.12Typical burner register arrangements are outlined
4.13Construction, operation and maintenance of boiler gauge glasses and safety valves is explained
4.14Operation of boiler control and soot blowing system is detailed
4.15Features of a three-element water level control system and relationship with burner management system are outlined
4.16Operation of a combustion control system fitted with cross limits on air and fuel is explained
4.17Blow-down procedure for a high-pressure boiler is prepared

5 Analyse operation, maintenance and performance of high-pressure water tube boilers and ancillary equipment

5.1Warm-through procedure and checks to be carried out before connecting boiler to range are explained
5.2How boiler is laid up for short and/or long periods is explained
5.3Actions required after oil or saltwater contamination are detailed
5.4Chemical cleaning procedure to remove scale and oil deposits from internal surfaces of a boiler is explained
5.5Tube failures are identified, and suitable methods of repair are selected
5.6Defects that can occur in economisers and how they can be repaired are listed
5.7Maintenance inspection procedures to prevent superheater and economise fires are produced
5.8Procedure to combat soot and steam/iron fires in generating banks, superheaters and economisers is outlined
5.9Coordinate and congruent feed water treatment is illustrated on a caustic/phosphate graph
5.10Different feed water tests, procedures for each test and appropriate chemical treatments are explained
5.11Program 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
5.12Procedures for setting lift, adjusting blow-down of safety valves and carrying out an accumulation test on a boiler are outlined

6 Explain requirements for feed water treatment for high-pressure water tube boilers

6.1How salts are precipitated and how metal is corroded in the boiler and feed system is explained and method of prevention is outlined
6.2How oxygen is eliminated in high-pressure boilers is shown
6.3How pH is measured and controlled is explained
6.4Normal and maximum operating limits for boiler feed water treatment are identified and procedure to follow if these limits are exceeded is clarified
6.5Different feed water tests, procedure for each test and appropriate chemical treatments are explained
6.6Coordinate and congruent feed water treatment is illustrated on a caustic/phosphate graph

7 Explain construction and operation of high-pressure turbines

7.1Flow of steam through nozzles is analysed, and pressure and velocity compounding are illustrated
2.2Construction of blades, bearings, glands, rotors and casings is explained
7.3Warming-through procedure prior to start-up is explained
7.4Routine checks during operation are detailed
7.5Emergency operation of plant with one turbine inoperative is outlined
7.6Turbine shutdown procedure is clarified
7.7Procedures for opening up turbine for survey, routine checks of blades, casings, rotors, bearings, glands, drains and the reassembly of turbine are explained
7.8Precautions necessary when turbine and gearing casings are open are explained and any repairs or adjustments that may be required are identified

8 Analyse turbine operation, maintenance and performance

8.1Relationship between sequential nozzle operation and bar lift in steam turbines is explained
8.2Principle of operation of different trips and cut-outs is explained
8.3Differentiation is made between resonance and critical speed, and their effect on the turbine operation is explained
8.4Types of turbine vibration and where each type is found in a turbine is analysed
8.5System torsional vibration and effect of operating at critical speeds and in-built design elements required to avoid critical speeds are explained
8.6Back pressure and self-condensing turbo alternators are compared
8.7Governor system is explained
8.8Turbine control systems are explained
8.9Procedure for straightening a bowed turbine rotor is outlined
8.10Effect of hull fouling, sea state and propeller design on turbine performance is discussed
8.11Limits for extended operation and overload operation are discussed

9 Analyse turbine gearing arrangements and performance

9.1Single and double reduction gearing systems are compared and contrasted
9.2Features and applications of double helical involute gear teeth are outlined
9.3Advantages and disadvantages of single and double locked train gearboxes are analysed
9.4Construction and reason for installing flexible couplings in gearing system is explained
9.5Purpose of fitting a nodal drive in gearing system is clarified
9.6Features, functions and applications of star, planetary and solar epicyclic gearing are compared and contrasted
9.7Space savings resulting from use of epicyclic gearing are analysed
9.8Layout of a turbo-electric drive is detailed

10 Analyse flow of air and gas through a simple cycle marine gas turbine

10.1Construction of compressor, combustion system and single and two shaft turbines is explained
10.2Necessary controls required for control and protection of plant are confirmed
10.3Accessories necessary for safe operation of simple cycle marine gas turbines are listed

Performance evidence

accessing diagnostic information related to marine steam turbines
applying relevant work health and safety (WHS)/occupational health and safety (OHS) requirements and work practices
assessing own work outcomes and maintaining knowledge of current codes, standards, regulations and industry practices
identifying and applying relevant solutions to complex problems that can occur during operating steam propulsion plant and associated systems on a steam vessel
identifying and interpreting complex diagnostic information and performing complex mathematical calculations related to operating, repairing and maintaining marine steam turbines
identifying methods, procedures and materials needed for operating, maintaining and repairing marine steam turbines
imparting advanced knowledge and ideas verbally, in writing and visually
performing accurate and reliable calculations and producing accurate and reliable information.
reading and interpreting 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.

Knowledge evidence

accessories, including:
accessory gear
lube oil:
coolers
filters
pumps
starting devices
basic 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 and effects of defects of auxiliary steam turbines and actions to be taken
boiler operation, maintenance and performance, including:
boiler water level control methods
boiler water testing and treatment
changes in feed system that occur during fluctuating loads
construction and operation of feed system
construction and operation of high-pressure turbines
construction, operation and repair of high-pressure water tube boilers
design features and operative mechanism of marine steam turbine and associated auxiliaries, including:
material selection and design features of steam turbine
material selection and design features of steam turbine gearbox
energy balance for a steam turbine plant
established engineering practice and procedures for operating shipboard steam propulsion plant and associated systems in warm-through, manoeuvring, start-up, normal running, emergency and shutdown 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
operation of marine steam turbines
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 and effects of defects of auxiliary steam turbines and actions to be taken
procedures for reading and interpreting readings and indications of performance of steam propulsion plant and associated systems
requirements for feed water treatment for high-pressure water tube boilers
simple cycle marine gas turbine
trip and cut-outs, including:
axial displacement
bearing high temperature
high condenser level
loss of vacuum
over speed
vibration
turbine control systems, including:
bridge control
emergency operation
hydraulic control
local control
turbine operation, maintenance and performance
turbine-gearing arrangements and performance
turbine vibration, including:
axial
torsional
transverse
types, properties, tests, applications and treatment of fuels, lubricants and solvents/chemicals used onboard a steam vessel, including 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
WHS/OHS requirements and work practices.

Unit content sourced from training.gov.au — © Commonwealth of Australia, licensed under CC BY 4.0. Auditori is not affiliated with the Department of Employment and Workplace Relations.

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Questions about assessing MARL052

What does an assessment tool for MARL052 need to cover?

To satisfy the Principles of Assessment and Rules of Evidence, an assessment for MARL052 needs to address all 155 unit components: 10 elements with 85 performance criteria, 9 performance evidence requirements, 61 knowledge evidence requirements, and the foundation skills. A coverage matrix mapping each question and task to these components is what an auditor looks for.

How does Auditori generate an assessment tool for MARL052?

Auditori pulls the current release of MARL052 from training.gov.au and generates a complete package: candidate assessment, assessor guide with model answers and observation criteria, and a coverage matrix mapping every component. A suitably qualified person then reviews and approves the draft in a built-in workflow — consistent with ASQA's guidance on AI use in VET — before export as branded PDF and editable Word.

Is the first assessment tool really free?

Yes. Every new account includes one free credit — enough to generate the complete assessment tool for MARL052 — with no card and no subscription required. After that it's pay-as-you-go per unit.

Can I check my existing MARL052 assessment instead of generating a new one?

Yes — upload your existing assessment or learner guide and Auditori maps it against every element, performance criterion, PE and KE of MARL052, showing exactly what's covered and what's missing. Mapping costs a quarter of a credit.

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