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Elements and Performance Criteria

  1. Plan and prepare stability testing
  2. Calculate vessel trim and stability
  3. Apply tests, assessments and theories to confirm compliance
  4. Identify other impacts on stability calculations
  5. Document and report findings

Required Skills

Required Skills

Access and interpret a variety of information

Analyse information and data

Anticipate and solve problems that may occur in calculations

Ballast management

Calculate trim and stability using statutory formula and criteria

Carry out a range of different stability tests and assessments

Collate and prepare required documentation

Collect and accurately interpret valid and reliable data andor regulations

Identify and correct causes of erratic or excessive deviation in mass movements during an inclining experiment

Identify gaps in data and source additional information

Identify hazards assess risks and develop and implement risk treatment options

Liaise with relevant people to obtain information

Read and accurately interpret vessel specifications and design drawings

Relate effectively to people from a range of social cultural and ethnic backgrounds

Resolve conflict and negotiate effectively

Select and use appropriate equipment

Undertake research

Use calculation and stability software

Work independently and unsupervised

Required Knowledge

Application of vessel construction principles and stability assessments applicable to a wide range of operational contexts

Theories relating to damage stability and precautions to be taken to ensure downflooding or progressive flooding does not occur

Calculations and formulas related to determining vessel trim and stability

Cargo loading and impact on stability

Configuration and subdivision requirements of a typical vessel including

collision bulkhead

down flooding

deck edge immersion

freeboard and bulkhead deck

watertight compartments

weather tight compartments

vessel bulkhead

Correct identification and use of equipment and data required for stability tests and calculations

Damage control measures designed to maintain stabilise or restore hull watertight integrity

Definition of intact stability

Distribution of load on a vessel

Implications and management of free surface effect

Information and data requirements and statutory documents such as stability book safety management plans certificate of operation vessel history

Naval architectural theory to the level necessary to carry out stability assessments for a range of domestic commercial vessels surveyor is intending to survey

Procedures for

carrying out an inclining experiment

determining weights to be added or subtracted from calculated displacement to determine lightship displacement

maintaining vessel security and stability

measuring draughts and or freeboard to determine displacement of a vessel ie carrying out a lightship measurement

Recordkeeping requirements

Regulatory requirements for

calculating vessel stability

surveying vessels

vessel compliance to trim and stability

Requirements for conducting a load line survey

Risk management

Safety management procedures and precautions when determining vessel trim and stability

Simplified stability criteria as outlined in NSCV Part CA and CC

Survey report requirements

Typical problems and solutions related to vessel trim and stability

Types of simplified stability tests

Work health and safety WHSoccupational health and safety OHS requirements and safe work practices

Evidence Required

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

analysing planning and assessing trim and stability for at least five different vessels varying size and operational limits

carrying out and reporting on at least three inclining experiments and three lightship measurements

developing effective planning documents

providing high quality reports

performing accurate and reliable calculations

ensuring behaviour reflects relevant current legislative and regulatory requirements

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

industryapproved marine operations site where calculating assessing and reporting on vessel trim and stability can be conducted

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 andor 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 andor

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 calculating assessing and reporting on vessel trim and stability

direct observation of the candidate applying relevant WHSOHS 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


Range Statement

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.

Applicable stability criteria may include:

NSCV guidelines

USL Code

Regulatory requirements may include:

Marine Safety (Domestic Commercial Vessel) National Law

NSCV

Information and data may include:

Cargo information

Load lines

Means to:

sound tanks

read draught marks

Stability book

Tests and assessments may include:

Buoyancy and stability after flooding

Freeboard

Lightship measurement

Practical inclining

Roll period test

Simplified stability tests

Stability proof test

Types and effects of damage may include:

Added mass

Flooding

Large amounts of water on deck

Lost buoyancy

Stability considerations may include:

Ballast management

Closing openings

Damage control measures to maintain, stabilise or restore watertight integrity of hull

Distribution of load on a vessel

Positioning of stowage and lashing of cargo, stores and equipment

Taking action to avoid or minimise cargo shift

Taking precautions when using lifting equipment and other associated equipment

Operational impact may include:

Ballast

Cargo

Crew movement

Cross connections

Lifting gear (including cranes on deck)

Passengers and passenger movements

Towing

Vessel mooring arrangements

Wind /ice and other weather constraints