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

Demonstrate knowledge of corrosion control 
SAQA US ID UNIT STANDARD TITLE
254096  Demonstrate knowledge of corrosion control 
ORIGINATOR
SGB Water Sector 
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-  
FIELD SUBFIELD
Field 12 - Physical Planning and Construction Building Construction 
ABET BAND UNIT STANDARD TYPE PRE-2009 NQF LEVEL NQF LEVEL CREDITS
Undefined  Regular  Level 4  NQF Level 04  6 
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
2026-06-30   2029-06-30  

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 replaces: 
US ID Unit Standard Title Pre-2009 NQF Level NQF Level Credits Replacement Status
14053  Demonstrate knowledge of corrosion control  Level 5  Level TBA: Pre-2009 was L5  7   

PURPOSE OF THE UNIT STANDARD 
The qualifying learner achieving this unit standard will be able to identify causes of corrosion, explain ways to prevent corrosion and the principles of protecting pipeline materials from corrosion including cathodic protection. This competence will minimise corrosion damage on pipeline systems and contribute towards the maintenance of uninterrupted water services to consumers. This competence will enable the learner to suggest appropriate remedial action, which will result in corrosion control and the overall reduction of the cost of water to the organisation. In acquiring this competence the qualifying learner will lay a good foundation for future learning and action, and better understand the broader context of own work. 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
  • Communication at NQF Level 3.
  • Mathematical Literacy at NQF Level 3.
  • Knowledge of pipes, associated fittings, valves and meters. 
    		•

    UNIT STANDARD RANGE 
    Water and wastewater. 

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Explain the main causes of corrosion in water and wastewater reticulation systems. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Pipeline materials prone to corrosion are identified. 

    ASSESSMENT CRITERION 2 
    Conditions under which corrosion takes place are explained. 

    ASSESSMENT CRITERION 3 
    Main causes of corrosion are identified and explained. 

    SPECIFIC OUTCOME 2 
    Demonstrate knowledge of corrosion in sewers and related structures. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Corrosion is described in terms of the contributing physical and biological mechanisms occurring in wastewater pipes. 
    ASSESSMENT CRITERION RANGE 
    Sewage retention time, septicity, humidity, flow turbulence, bacterial action, aerobic and anaerobic conditions, conversion of hydrogen sulphide to sulphuric acid.
     

    ASSESSMENT CRITERION 2 
    Corrosion is described in terms of the techniques for its minimisation. 
    ASSESSMENT CRITERION RANGE 
    Ventilation, acid-resistant pipe products, chemical additives.
     

    ASSESSMENT CRITERION 3 
    Corrosion is described in terms of its effect on materials. 
    ASSESSMENT CRITERION RANGE 
    Concrete, PVC, ceramic, polyethylene (PE).
     

    SPECIFIC OUTCOME 3 
    Explain the most common methods of preventing corrosion in water and wastewater reticulation systems. 
    OUTCOME RANGE 
    Ventilation, cleaning, flow control, paints, epoxies, laggings, linings, cathodic protection devices. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Methods of preventing corrosion are identified and explained. 

    ASSESSMENT CRITERION 2 
    The advantages and disadvantages of each method are explained. 

    ASSESSMENT CRITERION 3 
    The most appropriate corrosion control method in own area of work is explained and reasons are given for choice of method. 

    SPECIFIC OUTCOME 4 
    Explain the principles of cathodic protection. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The principles of electrolytic action are described. 

    ASSESSMENT CRITERION 2 
    Cathodic protection devices are identified. 

    ASSESSMENT CRITERION 3 
    Installation of cathodic protection devices, in terms of code of practice is described. 

    SPECIFIC OUTCOME 5 
    Identify corrosion on pipes and fittings and apply appropriate corrosion control method. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Corrosion on pipes is identified. 

    ASSESSMENT CRITERION 2 
    Corrosion on fittings identified. 

    ASSESSMENT CRITERION 3 
    Appropriate corrosion control method on pipes is applied. 

    ASSESSMENT CRITERION 4 
    Appropriate corrosion control method on fittings is applied. 

    ASSESSMENT CRITERION 5 
    An explaination of why methods chosen are appropriate is given. 


    UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS 
  • Anyone assessing a learner or moderating the assessment of a learner against this unit standard must be registered as an assessor with the relevant ETQA.
  • Any institution offering learning that will enable the achievement of this unit standard must be accredited as a provider with the relevant ETQA.
  • Assessment and moderation of assessment will be overseen by the relevant ETQA according to the ETQA policies and guidelines for assessment and moderation.
  • Moderation must include both internal and external moderation of assessments at exit points of the qualification, unless ETQA policies specify otherwise. Moderation should also encompass achievement of the competence described both in individual unit standards as well as the integrated competence described in the qualification. 
    		•

    UNIT STANDARD ESSENTIAL EMBEDDED KNOWLEDGE 
    Learners to have a knowledge and understanding of:
  • The importance of corrosion control.
  • The impact on a water reticulation system of not controlling corrosion.
  • Cost-effective types of corrosion control in own workplace.
  • The difference between corrosion control at the coast and inland.
  • Other indicators of corrosion (Soil conditions and electrical impulses on the pipeline).
  • Cathodic reactions in neutral and acid waters.
  • Anodic half reaction in aqueous solution or slightly or slightly aerated water.
  • Aerobic bacteria corrosion.
  • Internal corrosion.
  • Anaerobic bacteria such as sulphate generating bacteria.
  • External corrosion and the mechanism for promoting this corrosion.
  • Galvanic corrosion. 
    		•

    UNIT STANDARD DEVELOPMENTAL OUTCOME 
    N/A 

    UNIT STANDARD LINKAGES 
    N/A 


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Identify and solve problems in which responses display that responsible decisions using critical and creative thinking have been made. This relates to:
  • Explain the main causes of corrosion. 
    		•

    UNIT STANDARD CCFO WORKING 
    Work effectively with others as a member of a team, group, organisation, and community. 

    UNIT STANDARD CCFO ORGANISING 
    Plan, organise and manage oneself and one`s activities responsibly and effectively. 

    UNIT STANDARD CCFO COLLECTING 
    Collect, analyse, organise and critically evaluate information. This relates to:
  • Explain the main causes of corrosion. 
    		•

    UNIT STANDARD CCFO COMMUNICATING 
    Communicate effectively using visual, mathematical and/or language skills in the form of oral and/or written presentation. This relates to:
  • Explain the main causes of corrosion.
  • Explain the most common methods of preventing corrosion.
  • Explain the principles of cathodic protection.
  • Identify corrosion on pipes and fittings and apply appropriate corrosion control method. 
    		•

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically, showing responsibility towards the environment and health of others. 

    UNIT STANDARD CCFO DEMONSTRATING 
    Demonstrate an understanding of the world as a set of related systems by recognising that problem-solving contexts do not exist in isolation. This relates to:
  • Explain the main causes of corrosion.
  • Explain the most common methods of preventing corrosion. 
    		•

    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 
    This unit standard replaces unit standard 14053, "Demonstrate knowledge of corrosion control", Level 5, 7 credits.

    Integrated Assessment:

    When conducting assessments, assessors must ensure that they are familiar with the full text of the unit standards being assessed. Assessors must ensure that the assessment covers the specific outcomes, critical cross-field outcomes and essential embedded knowledge by developing assessment activities and tools, which are appropriate to the contexts in which the learners are working. These activities and tools may include self-assessment, peer assessment, formative and summative assessment. It may be more effective and efficient to assess a number of unit standards together in an integrated way, thus reducing the overall number of assessments and ensuring that commonalities that exist between a number of unit standards are captured in a way that makes sense for assessment.

    Assessment Option:

    Learners could be assessed using the following methods:
  • Oral or written questions.
  • Observation or simulation. 
    		•

    QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Core  60189   Further Education and Training Certificate: Wastewater and Water Reticulation Services  Level 4  NQF Level 04  Passed the End Date -
    Status was "Reregistered"     		 2023-06-30  EWSETA 
    Elective  61570   National Diploma: Power Plant Process Control Operations  Level 5  NQF Level 05  Passed the End Date -
    Status was "Reregistered"     		 2023-06-30  EWSETA 


    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.
     
    1. CHILUTSI TRADING ENTERPRISE 
    2. EMANZINI STAFFING SOLUTIONS (PTY) LTD 
    3. ERGO MAPHELONG INSTITUTE (PTY) LTD 
    4. ERWAT 
    5. K-BONENG CONSULTING SERVICES (PTY) LTD 
    6. KGWEBISWANO SUPPLIES & SERVICES 
    7. MPUMELELO TRAINING 
    8. PROGRESSIVE SCHOOL OF BUSINESS AND ENGINEERING (PTY) LTD 


    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.