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Elements and Performance Criteria

  1. Calculate stability
  2. Manage weight distribution
  3. Maintain records of stability management

Required Skills

Required Skills

Apply knowledge of stability trim and stress tables diagrams and stress calculating equipment

Carry out calculations required when determining vessel stability and trim

Manage the loading and weight distribution of a vessel to ensure assigned load line conditions are not exceeded

Manage vessel stability in a range of conditions

Read and interpret vessel specifications and design drawings

Recognise problems affecting vessel stability and trim

Required Knowledge

Calculation of vessels stability using the inclining experiment

Effects of angle of loll

Effects of beam and form coefficient on the stability of a vessel

Effects of density of sea water on the draught and freeboard of a vessel

Effects of free surface on the stability of a vessel

Features of the loadline and draught marks of a vessel and methods for performing related calculations

Fundamental actions to be taken in the event of partial loss of intact buoyancy

Fundamentals of watertight integrity

Principal stresses that act on the structure of a vessel

Principal structural members of a vessel and the proper names for various parts

Problems related to the control of trim stability and stresses of vessels and appropriate action and solutions

Sections of the IMO STCW and AMSA Marine Orders related to intact stability criteria

Stability trim and stress tables diagrams and stress calculating equipment

Theory and calculations of vessel stability and dynamics

Use of computer programs in calculating stability

Work health and safety WHSoccupational health and safety OHS requirements and work practices

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

ensuring accuracy of calculations

attention to appropriate level of detail in recordkeeping

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 or simulation where maintaining vessel stability can be demonstrated

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 maintaining vessel stability

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


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.

Stability calculations must include:

Calculation of areas under the curve

Changes in draft and trim due to differing water densities

Correction for free surface effect

Draft and trim

Metacentric height

Moment of statical stability at small angles of heel

Transverse and longitudinal stability

Values for righting levers and construction of the curve of stability

Appropriate action may include:

Amending the vessel loading plan

Ballast management

Reduction of free surface

Data and information related to stability management may include:

Cargo stowage and loading plan

Records of stability calculations

Safety management system

Stability and trim booklet