1

Calculate stability

1.1

Vessel stability data book is made available and checked for endorsement

1.2

Data is interpreted to determine safety parameters for vessel

1.3

Stability is accurately calculated using data extracted from vessel stability data book

1.4

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

1.5

Miscalculations or unsafe conditions are recognised and recalculated or checked

1.6

Calculated stability data is recorded using appropriate units and correct number of significant figures

2

Control vessel stress and stability

2.1

Information from vessel stability information is used to determine loading limits and displacement from draft

2.2

Vessel weight distribution is managed to maintain stability condition within safe limits at all times and regulatory requirements are complied with under all conditions of loading

2.3

Relevant stability information is correctly communicated to others as required

2.4

Stability conditions of vessel are managed in adverse weather conditions

2.5

Emergencies that may jeopardise vessel stability are recognised and appropriate action is taken

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

Required Skills:

Carry out basic calculations associated with maintaining vessel stability

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

Manage stability of vessel in a range of conditions

Recognise problems affecting vessel stability

Required Knowledge:

Bilging and permeability

Centroids and centre of gravity

Change of draught and trim (MCT)

Conditions of stable, neutral and unstable equilibrium and effects of disturbing vessel from upright

Construction features and stress characteristics for vessels

Density and specific gravity

Dockwater and freshwater allowance

Effects of free surface of liquids

Factors that affect the rolling period of vessel

Forces and moments

Information contained in stability data books

Loading and discharging weights

Principal stresses that act on the structure of a vessel

Principles of vessel stability

Procedures for carrying out basic calculations associated with vessel stability

Relationship between light displacement, loaded displacement and deadweight tonnage

Stability curves

Steps involved in bring an unstable vessel to a stable condition

Tonnes per centimetre immersion (TPC)

Transverse and longitudinal dynamics

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 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 up to 80 metres 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 vessel up to 80 metres

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.

Stability calculations must include:

Correlation against stability book data

Draft

Final KG

Trim

Loading limits may include:

Not exceeding allowable passenger carrying capacity and distribution

Not exceeding vessel designed cargo carrying capacity

Understanding the effect of fuel, fresh water and ballast on cargo capacity

Emergencies may include:

Cargo shift

Damaged hull

Flooding of cargo spaces