This unit involves the skills and knowledge required to determine the stability and trim of a ship to ensure that stability conditions of ship comply with intact stability criteria under all conditions of loading, discharge and transfer of cargo.

This unit applies to people working in the maritime industry in the capacity of:

Master of a commercial vessel less than 80 metres in length within the exclusive economic zone (EEZ)

Master of a commercial vessel less than 500 gross tonnage (GT)

Watchkeeper Deck.

Licensing/Regulatory Information

Legislative and regulatory requirements are applicable to this unit.

Regulatory requirements include STCW International Maritime Organization (IMO) model course competencies and areas of knowledge, understanding and proficiency, together with the estimated total hours required for lectures and practical exercises. Teaching staff should note that timings are suggestions only and should be adapted to suit individual groups of trainees depending on their experience, ability, equipment and staff available for training.

Near Coastal Qualifications:

This unit is one of the requirements to obtain Australian Maritime Safety Authority (AMSA) certification as a Master less than 80 metres Near Coastal as defined in the Marine Order 505 (Certificates of competency - National Law) 2013.

Blue Waters Qualifications:

This unit is one of the requirements to obtain AMSA certification as a Master of a commercial vessel less than 500 gross tonnage (GT) or Watchkeeper Deck and to meet regulatory requirements this unit must be delivered consistent with Marine Orders and with the relevant sections of the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW).

ELEMENTS

PERFORMANCE CRITERIA

Elements describe the essential outcomes.

Performance criteria describe the performance needed to demonstrate achievement of the element.

1

Calculate stability

1.1

Ship stability data book is accessed and checked for endorsement

1.2

Sample worked data is interpreted to determine ship safety parameters

1.3

Transverse and longitudinal stability is accurately calculated using data extracted from the body of ship stability data book

1.4

Stability calculations are checked to ensure they correlate with data set out in ship stability book

1.5

Spurious or incorrect information is recognised and recalculated

1.6

Trim, draughts and list are adjusted, as required

1.7

Stability calculations are conducted at a time, frequency and scope appropriate to voyage

2

Manage weight distribution

2.1

Stability calculations are used to plan weight distribution to ensure assigned load line conditions are not exceeded

2.2

Weight distribution is controlled to maintain ship within acceptable stability and stress limits for loading operation and at all stages of voyage

2.3

Appropriate action is taken when weight distribution is compromising ship safety

3

Maintain records of stability management

3.1

Data and information related to stability management is accurately recorded

3.2

Data and information related to stability management is filed and stored according to organisational procedures

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria on at least one occasion and include:

applying appropriate actions to correct weight distribution, including:

amending the ship loading plan

ballast management

reduction of free surface

applying stability, trim and stress tables, diagrams and stress calculating equipment

carrying out calculations required when determining ship stability, listand trim

managing ship stability in a range of conditions

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

reading and interpreting ship specifications and design drawings

recognising problems affecting ship stability and trim

undertaking stability calculations, including:

calculation of areas under the curve

changes in draft and trim due to differing water densities

correction for free surface effect

dead weight

displacement

draft and trim

effect of slack tanks

metacentric height

moment of static stability at small angles of heel

movement of the centre of gravity

tonnes per centimetre (TPC)

transverse and longitudinal stability

values for righting levers and construction of the curve of stability.

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria and include knowledge of:

buoyancy, including:

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

calculation of ships stability using the inclining experiment

data and information related to stability management, including:

cargo stowage and loading plan

records of stability calculations

safety management system (SMS)

stability and trim booklet

effects of angle of loll

effects of beam and form coefficient on the stability of a ship

effects of density of sea water on the draught and freeboard of a ship, including freshwater allowance and dock water allowance

effects of free surface on the stability of a ship

features of the load-line and draught marks of a ship and methods for performing related calculations

fundamentals of watertight integrity

principal stresses that act on the structure of a ship

principal structural members of a ship and the proper names for various parts

problems related to the control of trim, stability and stresses of ships and appropriate actions and solutions

sections of the International Maritime Organization (IMO), International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW) and Australian Maritime Safety Authority (AMSA) Marine Orders related to intact stability criteria

stability, trim and stress tables, diagrams and stress calculating equipment

theory and calculations of ship stability and dynamics, including movement of weights

use of computer programs in calculating stability.

Assessors must hold credentials specified within the Standards for Registered Training Organisations current at the time of assessment.

Assessment must satisfy the Principles of Assessment and Rules of Evidence and all regulatory requirements included within the Standards for Registered Training Organisations current at the time of assessment.

Assessment processes and techniques must be appropriate to the language, literacy and numeracy requirements of the work being performed and the needs of the candidate.

Practical assessment must occur in a workplace, or realistic simulated workplace, under the normal range of workplace conditions.

Simulations and scenarios may be used where situations cannot be provided in the workplace or may occur only rarely, in particular for situations relating to emergency procedures and adverse weather conditions where assessment would be unsafe, impractical or may lead to environmental damage.

Resources for assessment must include access to:

applicable documentation, such as legislation, regulations, codes of practice, workplace procedures and operational manuals

tools, equipment, machinery, materials and relevant personal protective equipment (PPE) currently used in industry.

Foundation skills essential to performance are explicit in the performance criteria of this unit of competency.

Range is restricted to essential operating conditions and any other variables essential to the work environment.

Not applicable.

A – Handling Cargo and Vessel Stability