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Elements and Performance Criteria

  1. Manage vessel trim under normal operating conditions
  2. Control vessel stability when compartment is flooded
  3. Manage stress conditions of the vessel
  4. Maintain records of stability management

Range Statement

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

Calculations include:

calculating required load distribution to achieve desired trim

calculations for change of draught, trim and heel when entering different water densities and to bilging of compartments

centre of gravity of a vessel using an inclining experiment and effect of suspended weights

changes to draught, trim and heel due to adding or removing fuel, ballast or cargo

determining required correction for height of centre of gravity (kg) for free surface effect

determining values of righting lever and construction of righting lever curves

displacement, wetted surface, form coefficients, tonne per centimetre immersion, application of Simpson’s rules to first and second moments of area, centroids and centres of pressure

effect on stability of dry docking and grounding

hydrostatic stability of a vessel

moment of statistical stability at small angles of heel

shear force and bending moment calculations

transverse and longitudinal stability using hydrostatic data

vessel centre of gravity, centre of buoyancy and metacentre

Factors include one or more of the following:

dry docking

excessive trim

free surface of a liquid

grounding

handling of heavy weights

large swell conditions

shift of cargo

wind heel

Damage to vessel includes one or more of the following:

damage caused by incorrectly lashed or secured cargo

damage caused by incorrectly stowed cargo

damage to cargo handling equipment by exceeding safe working limits

Nature of flooding includes one or more of the following:

flooding due to collision or grounding

ingress of sea water through hatch covers

Suitable strategy includes one of the following:

addition of ballast

temporary damage repairs

Data and information includes one or more of the following:

cargo handling equipment

instructions of relevant maritime authorities

manufacturer instructions and procedures

organisational cargo handling procedures

relevant Australian and international standards and regulatory requirements

relevant work health and safety (WHS)/occupational health and safety (OHS) legislation

vessel and shore safety checklists

vessel Cargo Securing Manual

vessel log

vessel Register of Materials Handling Equipment


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:

applying International Maritime Organization (IMO) recommendations concerning vessel stability

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

attending to appropriate level of detail in recordkeeping

determining stability and trim requirements for docking or slipping the vessel

determining the effect on trim and stability of vessel in the event of damage to and consequent flooding of a compartment, and countermeasures to be taken

interpreting and applying information on the fundamental principles of vessel construction and the theories and factors affecting trim and stability, and measures necessary to preserve trim and stability

maintaining stability and stress conditions within safe limits at all times

producing accurate and reliable documentation

using automatic data-based equipment.


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:

causes and repercussions of a heeling vessel

effects of angle of loll including centre of buoyancy, how a ship behaves at the angle of loll, inherent dangers, corrective action and the difference between a loll and a list

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

features of the load-line and draught marks of a vessel and procedures for carrying out related calculations

fundamental principles of ship construction and the theories and factors that impact on trim and stability, and measures necessary to preserve trim and stability

IMO recommendations concerning vessel stability

levelling arrangements for damaged side compartments

principle stresses that act on the structure of a vessel, including panting and pounding

principles of parametric rolling and control methods

principles of synchronous rolling and methods for its control

procedures for calculating the required load distribution to achieve the desired trim

typical problems related to the control of trim and stability for vessels of 500 gross tonnage and more

WHS/OHS requirements and work practices.