Unit of competency Outline

Date retreived
22/07/2026 6:32 AM AWST

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Apply basic principles of marine mechanics

Apply basic principles of marine mechanics

Unit of competency
National Code
MARL5003A
State Code
WG461
TGA Status
Replaced
DTWD Status
Replaced
Current Release Number
1.00
Current Release Date
06/06/2013
State Implementation and Classification
Approved Date
04/02/2014
Field of Education
031701 - Maritime Engineering
Original Release Date
04/02/2014
Nominal Hours
20
Description
This unit involves the skills and knowledge required to apply the basic principles of marine mechanics and to perform associated calculations needed to operate and maintain marine machinery.
Notes
Elements and Performance Criteria
1 Use vector diagrams to calculate the resultant and equilibrant of up to four coplanar forces
  • 1.1 Meaning of force as a vector, moment of a force, resultant and equilibrant are explained
  • 1.2 Forces using the triangle and polygon of forces are determined
  • 1.3 Moments and couples applied to beams and levers are explained
  • 1.4 Centroid of an area is calculated
  • 1.5 Centre of gravity of regular geometrical shapes is calculated
  • 1.6 Resultant and equilibrant of a system of concurrent coplanar-planer forces are calculated
2 Solve problems involving friction
  • 2.1 Nature of friction and the laws of dry sliding friction are explained
  • 2.2 Influence of lubrication on bearings and plain surfaces is outlined
  • 2.3 Coefficient of friction is derived
  • 2.4 Laws of friction are applied to movement in a horizontal plane and the force to overcome friction on horizontal surfaces
  • 2.5 Effect of lubricating two surfaces in contact with each other is outlined
3 Apply laws of motion
  • 3.1 Laws of motion are explained
  • 3.2 Velocity/time and acceleration/displacement graphs are sketched and adapted to derive the standard velocity formula for both linear and angular motion
  • 3.3 Formula and/or graphs are applied to solve problems of linear and angular velocity
  • 3.4 Linear motion is converted to angular motion and revolutions to radians
4 Solve problems in dynamics related to marine machinery
  • 4.1 Relationship between torque, work, energy and power in marine engines and compressors is explained
  • 4.2 Conservation of energy theorem is used to calculate energy and power during linear and angular motion
  • 4.3 Meaning of momentum is explained
  • 4.4 Calculations are performed associated with the collision of rigid bodies
  • 4.5 Centrifugal force is distinguished from centripetal force
  • 4.6 Centrifugal and centripetal force in relation to marine machinery is calculated
5 Determine efficiency of lifting and geared marine machinery
  • 5.1 Velocity ratio, mechanical advantage and efficiency of simple machines is calculated
  • 5.2 Calculations are performed to solve problems related to the operation of simple machines
6 Calculate stress and strain due to axial loads
  • 6.1 Normal stress is distinguished from strain
  • 6.2 Hooke's Law for stress and strain is explained
  • 6.3 Meaning of elastic limit, ultimate tensile strength, yield stress, limit of proportionality and factor of safety is explained
  • 6.4 Normal stress and strain caused by axial loads is calculated
7 Determine shear stress and strain in coupling bolts and simple bolted connections
  • 7.1 Shear stress in simple bolted connections is determined
  • 7.2 Torque theory is applied to calculate shear stress in coupling bolts
8 Determine stresses in thin walled pressure vessels
  • 8.1 Factor of safety and joint efficiency factor for pressure vessels is calculated
  • 8.2 Hoop and longitudinal stress in thin walled pressure vessels is calculated
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.
Simple machines may include:
Hydraulic jack
Pulley blocks
Reduction gears
Screw jack
Single and double purchase crab winches
Warwick screw
Wheel and axle
Worm driven chain blocks
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
solving problems using appropriate laws and principles.
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 basic principles of marine mechanics can be applied
diagrams, specifications and other information required for performing basic calculations related to marine mechanics
technical reference library with current publications on basic marine mechanics
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.
Method of assessment
Practical assessment must occur in an:
appropriately simulated workplace environment and/or
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 applying basic principles of marine mechanics
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.
Replaced By
State Code National Code Title Type
AUG82 MARL012 Apply basic principles of marine mechanics Unit of competency
State Code National Code Title Type
J563 MAR50213 Diploma of Maritime Operations (Engineer Watchkeeper) Qualification