1

Manage vessel trim under normal operating conditions

1.1

Stability analysis and weight distribution planning are conducted at a time frequency and scope appropriate to the proposed nature of the voyage and vessel operation

1.2

Weight distribution is arranged to maintain vessel within acceptable stability limits for the anticipated operational situations likely to be experienced during the voyage

1.3

Calculations are made to determine the draught and centre of gravity of vessel after adding, removing or shifting weight

1.4

Factors affecting the stability and trim of vessel are identified and allowances are made in calculations

1.5

Trim, draughts and list of vessel are controlled as required to ensure they are suitable to progress all anticipated vessel operations

2

Control vessel stability when compartment is flooded

2.1

Damage to vessel and nature of flooding of compartments is assessed

2.2

Effect upon vessel stability of flooded and flooding compartments is evaluated

2.3

Suitable strategy for maintaining or restoring trim and stability is devised

2.4

Where stress limits of the vessel are exceeded as a consequence of damage and/or flooding, appropriate action is initiated to ensure safety of personnel, including where necessary abandoning the vessel

3

Manage stress conditions of the vessel

3.1

Stress levels of the vessel are assessed according to manufacturer specifications

3.2

Stability of the vessel is monitored at a frequency and scope relevant to vessel operations and is sufficient to enable stress and stability to be maintained within acceptable limits at all times

3.3

Appropriate action is taken where weight distribution has or could exceed acceptable safety limits

4

Maintain records of stability management

4.1

Data and information related to stability management is accurately recorded

4.2

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

Required Skills:

Apply IMO recommendations concerning vessel stability

Determine stability and trim requirements for docking or slipping the vessel

Determine 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

Interpret and apply 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

Maintain stability and stress conditions within safe limits at all times

Use automatic data-based equipment

Required Knowledge:

Causes and repercussions of a heeling vessel

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

Principles of synchronous rolling and methods for its control

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

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

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

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:

attention to appropriate level of detail in recordkeeping

producing accurate and reliable documentation.

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 or simulation where managing stability of a vessel of 500 gross tonnage or more may 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 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 managing stability of a vessel of 500 gross tonnage or more

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.

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.

Calculations must 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 statical stability at small angles of heel

Transverse and longitudinal stability using hydrostatic data

Vessel centre of gravity, centre of buoyancy and metacentre

Factors may include:

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 may include:

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 may include:

Flooding due to collision or grounding

Ingress of sea water through hatch covers

Suitable strategy may include:

Addition of ballast

Temporary damage repairs

Data and information may include:

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 WHS/OHS legislation

Vessel and shore safety checklists

Vessel Cargo Securing Manual

Vessel log

Vessel Register of Materials Handling Equipment