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Evidence Guide: MARA023 - Manage trim, stability and stress of a vessel

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

From the Wiki University

 

MARA023 - Manage trim, stability and stress of a vessel

What evidence can you provide to prove your understanding of each of the following citeria?

Manage vessel trim under normal operating conditions

  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
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

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

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

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

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

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

Completed
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Control vessel stability when compartment is flooded

  1. Damage to vessel and nature of flooding of compartments is assessed
Damage to vessel and nature of flooding of compartments is assessed

Completed
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Effect upon vessel stability of flooded and flooding compartments is evaluated

Completed
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Suitable strategy for maintaining or restoring trim and stability is devised

Completed
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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 abandoning the vessel, as required

Completed
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Manage stress conditions of the vessel

  1. Stress levels of the vessel are assessed according to manufacturer specifications
Stress levels of the vessel are assessed according to manufacturer specifications

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

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

Completed
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Maintain records of stability management

  1. Data and information related to stability management is accurately recorded
Data and information related to stability management is accurately recorded

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

Completed
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Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Required Skills and Knowledge

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria 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

identifying vessels trim and stability factors

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

undertaking stability calculations, including:

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 (CG) 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 CG for free surface effect

determining values of righting lever and construction of righting lever curves

displacement, wetted surface, form coefficients, tonne per centimetre (TPC) 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

permeability

shear force and bending moment calculations

transverse and longitudinal stability using hydrostatic data

vessel CG, centre of buoyancy and metacentre

using automatic data-based equipment.

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria and include knowledge of:

causes and repercussions of a heeling vessel

data and information related to stability management, including:

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

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

effects of flooding on transverse stability and trim, including:

calculation of vessel after flooding

cargo vessels

passenger ships

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

fundamental theories and 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

nature of flooding, including:

flooding due to collision or grounding

ingress of sea water through hatch covers or ruptured pipes

principle stresses that act on the structure of a vessel, including panting and pounding, shear force, bending moments and torsional stress

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

responsibilities under international conventions and codes, including:

IMO grain regulations and grain heeling moment information

minimum stability requirements required by Load Line Rules and Intact Stability Code

passenger ship stability after damage

use of weather criterion

stability, including:

dynamical

intact, including grain

statical

suitable strategies for stabilising vessels

survey and dry dock requirements

trim and list

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

vessels trim and stability factors for:

dry docking

excessive trim

free surface of a liquid

grounding

handling of heavy weights

large swell conditions

shift of cargo

wind heel

WHS/OHS requirements and work practices.

Range Statement

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