REQUIRED KNOWLEDGE

This describes the knowledge required for this unit

Relevant sections of the IMO Conventions and Codes and AMSA Marine Orders

Relevant OHampS legislation codes of practice policies and procedures

Theory and calculations of vessel stability and dynamics including

i computation of hydrostatic stability data of a vessel

ii calculation of a vessels centre of gravity centre of buoyancy and metacentre

iii calculation of the transverse and longitudinal stability using hydrostatic data

iv calculation of the moment of statical stability at small angles of heel

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

vi determining the required correction for the height of centre of gravity kg for the free surface effect

vii determination of the values of the righting lever and construction of righting lever curves

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

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

x displacement wetted surface form coefficients tonne per centimetre immersion application of Simpsons rules to first and second moments of area centroids and centres of pressure

Potential problems related to the control of trim and stability for vessels of gross tonnage or more and appropriate action and solutions including

Potential problems related to the control of trim and stability for vessels of 500gross tonnage or more and appropriate action and solutions, including:

i free surface of a liquid

ii shift of cargo

iii wind heel

iv handling of heavy weights

v excessive trim

vi large swell conditions

vii dry docking

viii grounding

Principles of synchronous rolling and methods for its control including an understanding of the effect on the rolling period of a vessel due to the radius of gyration

Causes and repercussions of a heeling vessel

Principal features of the structure of a vessel

Properties and application of materials used in vessel construction

Construction layout and subdivision requirements of a typical vessel including an understanding of freeboard and bulkhead deck watertight compartments weathertight compartments the bulkhead of the vessel and collision bulkhead

Typical construction features stress characteristics forces on vessels under various conditions or vessels of gross tonnage or more in the case of masters or kW propulsion power in the case of engineers

Typical construction features, stress characteristics, forces on vessels under various conditions or vessels of 500gross tonnage or more (in the case of masters), or 3,000kW propulsion power (in the case of engineers)

The principal stresses which act on the structure of a vessel including panting and pounding

Steps involved interpreting and analysing a vessels dynamic stability and comparing it against the IMOs minimum stability criteria

Basic procedures and precautions for the repair and maintenance of a vessel

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

Features of the loadline and draught marks of a vessel and procedures for carrying out related calculations

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 gross tonnage or more in the case of masters or kW propulsion power in the case of engineers and appropriate action and solutions including

Typical problems related to the control of trim and stability for vessels of 500gross tonnage or more (in the case of masters), or 3,000kW propulsion power (in the case of engineers) and appropriate action and solutions, including:

i problems concerning the strength of structural members to resist liquid pressure and loading due to a head of liquid

ii problems involving shearing force and bending moments of a loaded vessel in still water

Simple treatment of vibration

Bilge and ballast systems

Levelling arrangements for damaged side compartments

TDMMAB CONTROL TRIM STABILITY AND STRESS

TDMMA1007B CONTROL TRIM, STABILITY AND STRESS

REQUIRED SKILLS

This describes the skills required for this unit

Communicate effectively with other personnel when determining and maintaining a vessels stability and trim

Interpret and apply information on the fundamental principles of vessel construction the theories and factors affecting trim and stability of a vessel and the required measures necessary to preserve trim and stability

Identify and interpret information on the following

i the effect on vessels stability of

free surface of a liquid

shift of cargo

wind heel

handling of heavy weights

ii the effect of excessive trim and swell conditions on stability

iii the effect of radius of gyration on the rolling period of the vessel

iv the causes of heel and the repercussions of a heeling vessel

Interpret and analyse a vessels dynamic stability

Determine the effect of a damaged condition on stability and trim

Work collaboratively with other shipboard personnel when determining and maintaining a vessels stability and trim

Carry out calculations involved in

i computing the hydrostatic stability data of a vessel using Simpsons Rules

ii calculating the position of the vessels metacentre

iii calculating transverse and longitudinal stability using hydrostatic data

iv determining by calculation the change of draft and trim when entering different water densities

v determining by calculation the required weight distribution to achieve a desired trim

vi calculating the effect on stability of dry docking and grounding

Use appropriate computer programs as required to analyse a vessels stability and trim

TDMMAB CONTROL TRIM STABILITY AND STRESS

TDMMA1007B CONTROL TRIM, STABILITY AND STRESS

The Evidence Guide provides advice on assessment and must be read in conjunction with the Performance Criteria the Range Statement and the Assessment Guidelines for this Training Package

The Evidence Guide provides advice on assessment and must be read in conjunction with the Performance Criteria, , the Range Statement and the Assessment Guidelines for this Training Package.

Critical aspects of evidence required to demonstrate competency in this unit

Assessment must confirm appropriate knowledge and skills to

a

Monitor and maintain the stability and stress conditions of a vessel at all times

b

Carry out all calculations required to assess and analyse the stability and stress conditions of a vessel

c

Communicate effectively with others concerning operations to maintain the trim stability and stress conditions of a vessel

Evidence required for demonstration of consistent performance

a

Performance is demonstrated consistently over a period of time and in a suitable range of contexts

b

Consistently applies underpinning knowledge and skills when

controlling the trim and stability and managing the stresses of a vessel

identifying and evaluating trim stability and stress problems and determining appropriate courses of action

completing all calculations needed to assess and analyse the stability and stress conditions of a vessel

identifying and implementing improvements to procedures for the control of trim and stability of a vessel

applying safety precautions relevant to manoeuvring operations

assessing trim and stability of vessel in both normal and emergency situations

c

Shows evidence of application of relevant workplace procedures including

relevant sections of IMO Conventions and Codes and AMSA Marine Orders

ISM Code and associated vessels safety management system and procedures

OHampS regulations and hazard prevention policies and procedures

job procedures and work instructions

relevant manufacturers guidelines relating to the trim stability and stress limits of the vessel

quality procedures where existing

procedures to protect the integrity and security of the vessels hull

environmental protection procedures when pumping ballast water

d

Action is taken promptly to report andor rectify outoflimit trim stability and stresses of the vessel in accordance with manufacturers instructions statutory requirements and company procedures

continued

TDMMAB CONTROL TRIM STABILITY AND STRESS

TDMMA1007B CONTROL TRIM, STABILITY AND STRESS

Evidence required for demonstration of consistent performance

continued

e

Work is completed systematically with required attention to detail

f

Recognises and adapts appropriately to cultural differences in the workplace including modes of behaviour and interactions among crew and others

Context of assessment

a

Assessment of competency must comply with the assessment requirements of the relevant maritime regulations

b

Assessment of this unit must be undertaken within relevant marine authority approved and audited arrangements by a registered training organisation

As a minimum assessment of knowledge must be conducted through appropriate writtenoral examinations and

Appropriate practical assessment must occur

i

at the registered training organisation andor

ii

on an appropriate working or training vessel

Specific resources required for assessment

Access is required to opportunities to

a

participate in a range of exercises case studies and other simulated practical and knowledge assessments that demonstrate the skills and knowledge to maintain the trim and stability of a vessel in a range of operational situations andor

b

the trim and stability of a vessel in a range of operational situations either

i using a simulator meeting the requirements of Section A I of the IMO STCW Code over an appropriate range of simulated loading and operational situations

ii in appropriate practical situations on an operational commercial or training vessel

The Range Statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance.

VARIABLE

a.

Work must be carried out:

1

b.

Work is performed:

1

c.

Work involves:

1

d.

Work requires:

1

a

Vessel may include:

1

b

Measures to control the trim and stability of the vessel may be carried out:

1

2

3

4

VARIABLE

b

Measures to control the trim and stability of the vessel may be carried out:

(continued)

5

during berthing and unberthing operations

6

7

c

Measures to control the trim and stability of the vessel may include:

1

adjusting weight distribution of load

2

3

4

d

Documentation and recordsmay include:

1

2

3

4

5

6

7

8

9

10

11

12

e

Applicable legislation, regulations and codes may include:

1

2

3

4