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SOUTH AFRICAN QUALIFICATIONS AUTHORITY 
REGISTERED UNIT STANDARD THAT HAS PASSED THE END DATE: 

Explain flotation, buoyancy, stability and the centre of gravity with reference to a sea going vessel 
SAQA US ID UNIT STANDARD TITLE
264878  Explain flotation, buoyancy, stability and the centre of gravity with reference to a sea going vessel 
ORIGINATOR
SGB Maritime Operations 
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-  
FIELD SUBFIELD
Field 11 - Services Transport, Operations and Logistics 
ABET BAND UNIT STANDARD TYPE PRE-2009 NQF LEVEL NQF LEVEL CREDITS
Undefined  Regular  Level 3  NQF Level 03  3 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Passed the End Date -
Status was "Reregistered" 		 2018-07-01  2023-06-30  SAQA 06120/18 
LAST DATE FOR ENROLMENT LAST DATE FOR ACHIEVEMENT
2024-06-30   2027-06-30  

In all of the tables in this document, both the pre-2009 NQF Level and the NQF Level is shown. In the text (purpose statements, qualification rules, etc), any references to NQF Levels are to the pre-2009 levels unless specifically stated otherwise.  

This unit standard does not replace any other unit standard and is not replaced by any other unit standard. 

PURPOSE OF THE UNIT STANDARD 
The person credited with this unit standard will be able to describe the concepts and principles of flotation and displacement and describe the basic practical concepts and principles of buoyancy and reserve buoyancy. They will also be able to describe the concepts, principles of statical ability, assess the curve of this ability and describe the movement of the centre of gravity.

The qualifying learner is capable of:
  • Describing the concepts/principles of flotation and displacement.
  • Describing the basic/practical concepts/principles of buoyancy and reserve buoyancy.
  • Describing the concepts/principles of fundamental statical stability, assessment of initial stability and the curve of statical stability.
  • Describing the movement of the centre of gravity (G). 
    		•

    LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
    Learners accessing this qualification will have demonstrated competence in:
  • Communication at NQF Level 2 or equivalent.
  • Mathematical Literacy at NQF Level 2 or equivalent. 
    		•

    UNIT STANDARD RANGE 
    The following scope and context applies to the whole unit standard:
  • This unit standard introduces the practical awareness of flotation, buoyancy, stability and the centre of gravity with reference to a sea going vessel.
  • The vessel will be a sea going vessel.
  • SAMSA's Code for South African Maritime Qualifications: Study matrices and syllabuses for fishing and marine motorman qualifications, Naval Architecture (Fishing), Module 3, any amendments or equivalent. 
    		•

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Describe the concepts/principles of flotation and displacement. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The practical relationship between the mass of a ship and the volume of water displaced by the hull form is explained with maritime specific examples. 

    ASSESSMENT CRITERION 2 
    The relationship between the change in volume displaced by a ship and the change in mass of a ship is explained with maritime specific examples. 

    ASSESSMENT CRITERION 3 
    The concepts displacement and deadweight are explained with examples in terms of light and load displacement. 

    ASSESSMENT CRITERION 4 
    The displacement of a ship is calculated in accordance with standards and procedures. 

    ASSESSMENT CRITERION 5 
    The use of displacement/draught curve and deadweight curve/scale is explained and demonstrated in accordance with standards and procedures. 

    SPECIFIC OUTCOME 2 
    Describe the concepts and principles of buoyancy and reserve buoyancy. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The concepts and principles of buoyancy are described with reference to naval architectural terms and industry specific examples. 
    ASSESSMENT CRITERION RANGE 
    Buoyancy includes reserve buoyancy.
     

    ASSESSMENT CRITERION 2 
    The relationship between force of buoyancy and displacement is explained with maritime specific examples. 

    ASSESSMENT CRITERION 3 
    Reserve buoyancy is explained in terms of its importance and the relationship between it and freeboard. 

    SPECIFIC OUTCOME 3 
    Describe the concepts and principles of stability. 
    OUTCOME RANGE 
    Stability may include but is not limited to fundamental statical stability, assessment of initial stability and the curve of statical stability. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Definitions of statical stability are given in accordance with internationally recognised naval architecture terms. 
    ASSESSMENT CRITERION RANGE 
    Definitions may include but is not be limited to Centre of gravity, Centre of buoyancy, Metacentre, Metacentric height, Righting lever and Righting moment.
     

    ASSESSMENT CRITERION 2 
    The concepts and principles of statical stability are interpreted with the aid of diagrams. 

    ASSESSMENT CRITERION 3 
    The concepts of a stable or unstable ship and the position of positive, negative and zero on Metacentric Height (GM) are explained with the aid of diagrams. 
    ASSESSMENT CRITERION RANGE 
    A stable and unstable ship concepts may include but are not limited to a capsizing moment, the angle of loll and rolling about an angle of loll.
     

    ASSESSMENT CRITERION 4 
    The relationship between the righting lever, righting moment for small and large angles of heel are explained with the aid of diagrams. 

    SPECIFIC OUTCOME 4 
    Describe the movement of the centre of gravity (G). 
    OUTCOME RANGE 
    The different ways of movement of mass includes when mass is added (loaded), removed (discharged), moved within the ship and suspended (from a derrick hook). 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The movement of gravity is described with examples of when a mass is moved within the ship. 

    ASSESSMENT CRITERION 2 
    The movement of gravity is described with examples of when mass is added to or removed from the ship. 

    ASSESSMENT CRITERION 3 
    The movement of gravity is described with examples of when a mass is suspended on the ship. 


    UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS 
  • An individual wishing to be assessed (including through RPL) against this unit standard may apply to an assessment agency, assessor or provider institution accredited by the relevant ETQA.
  • Anyone assessing a learner against this unit standard must be registered as an assessor with the relevant ETQA.
  • Any institution offering learning that will enable achievement of this unit standard or assessing this unit standard must be accredited as a provider with the relevant ETQA.
  • Moderation of assessment will be conducted by the relevant ETQA at its discretion. 
    		•

    UNIT STANDARD ESSENTIAL EMBEDDED KNOWLEDGE 
  • SAMSA's Deck Officer (Fishing under 24m) or equivalent.
  • SAMSA's Code for South African Maritime Qualifications: Study matrices.
    syllabuses for fishing and marine motorman qualifications, Naval Architecture (Fishing), Modules 1 & 2, any amendments or equivalent.
  • Knowledge underpinning this unit standard includes the relevant sections of associated legislation.
  • General maritime proactive safety awareness relative to fellow mariners, vessels and environment.
  • An awareness of one's situation at all times utilising all one's senses. 
    		•

    UNIT STANDARD DEVELOPMENTAL OUTCOME 
    N/A 

    UNIT STANDARD LINKAGES 
    N/A 


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
  • Identify and solve problems related to the concepts/principles of flotation and displacement, the basic/practical concepts/principles of buoyancy and reserve buoyancy and the concepts/principles of fundamental statical stability, assessment of initial stability and the curve of statical stability. 
    		•

    UNIT STANDARD CCFO COLLECTING 
    Collect, analyse, organise and critically evaluate information pertaining to the concepts of buoyancy, flotation, displacement, statical stability and the movement of centre of gravity of a sea going vessel. 

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology to assist in the understanding of flotation, buoyancy, stability and the centre of gravity with reference to a sea going vessel. 

    UNIT STANDARD CCFO DEMONSTRATING 
    Demonstrate the world as a set of related systems where the inaccurate knowledge of buoyancy and flotation may lead to an unsafe situation for both the crew and the vessel. 

    UNIT STANDARD ASSESSOR CRITERIA 
    N/A 

    REREGISTRATION HISTORY 
    As per the SAQA Board decision/s at that time, this unit standard was Reregistered in 2012; 2015. 

    UNIT STANDARD NOTES 
    N/A 

    QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Elective  67329   National Certificate: Inshore Maritime Operations  Level 3  NQF Level 03  Passed the End Date -
    Status was "Reregistered"     		 2015-06-30  TETA 


    PROVIDERS CURRENTLY ACCREDITED TO OFFER THIS UNIT STANDARD: 
    This information shows the current accreditations (i.e. those not past their accreditation end dates), and is the most complete record available to SAQA as of today. Some Primary or Delegated Quality Assurance Functionaries have a lag in their recording systems for provider accreditation, in turn leading to a lag in notifying SAQA of all the providers that they have accredited to offer qualifications and unit standards, as well as any extensions to accreditation end dates. The relevant Primary or Delegated Quality Assurance Functionary should be notified if a record appears to be missing from here.
     
    NONE 


    All qualifications and part qualifications registered on the National Qualifications Framework are public property. Thus the only payment that can be made for them is for service and reproduction. It is illegal to sell this material for profit. If the material is reproduced or quoted, the South African Qualifications Authority (SAQA) should be acknowledged as the source.