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Elements and Performance Criteria

  1. Determine data requirements
  2. Evaluate simplified stability data
  3. Carry out reporting requirements

Range Statement

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

Basic data includes one or more of the following:

certificate of survey

vessel log

vessel plans and drawings

vessel stability data book

Commercial vessels must include:

vessels defined as commercial vessels in Marine Safety (Domestic Commercial Vessel) National Law

Precautions include one or more of the following:

ballast management

closing openings exposed to weather

damage control measures to maintain, stabilise or restore watertight integrity of hull during an emergency

managing distribution of load on vessel

managing position, stowage and lashing of cargo, stores and equipment, and location of passengers

taking precautions when using lifting equipment and associated gear

Emergency situations include one or more of the following:

flooding when there is damage to hull

inadequate securing of weights on board

unplanned movement of heavy items or stores and equipment on board vessel


Performance Evidence

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

Analysing, planning and carrying out vessel stability calculation should be undertaken for at least five different types and size of vessels and include:

applying relevant work health and safety/occupational health and safety (WHS/OHS) requirements and work practices

carrying out accurate and reliable calculations associated with vessel stability using basic stability criteria calculations, including interpreting and correlating resultant data

interpreting measurements and observations required when maintaining vessel stability

providing high quality reports

reading and interpreting vessel specifications and drawings

reading, interpreting and applying simple instructions for maintaining vessel stability

selecting and using relevant equipment according to instructions.


Knowledge Evidence

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

basic stability theory, including:

equilibrium

impact of design and hull shape on stability

principles of stability

relationship between weight and buoyancy in relation to floating bodies

reserve buoyancy

terms and definitions

difference between transverse and longitudinal stability, and causes of list and trim

effects of density of water on draught and freeboard of vessel

effects on vessel stability that has been bilged

information contained in basic stability data book supplied to vessel and how this information is used to maintain vessel in a stable condition during operations

marine Safety (Domestic Commercial Vessel) National Law

principal design features of vessels related to stability and watertight integrity, such as:

maintenance and survey requirements necessary to maintain watertight integrity of vessel

openings in hull and on main deck of vessel and safe working practices that must be followed to maintain watertight integrity

principal factors that affect operational stability of vessel and related measures that can be taken to maintain stability, including:

adding and removing weights

additions and alterations to vessel structure

free surface effect of slack tanks

operation of lifting equipment

roll period

stiff and tender condition

water on deck

recording stability calculations in survey report

relationship between lightship, loaded displacement and deadweight

relevant WHS/OHS legislation and policies

steps involved in bringing unstable vessel to a stable condition.