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

Select and specify vibration control systems for air-conditioning, refrigeration and ventilation systems 
SAQA US ID UNIT STANDARD TITLE
9449  Select and specify vibration control systems for air-conditioning, refrigeration and ventilation systems 
ORIGINATOR
SGB Air-conditioning Refrigeration and Ventilation 
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-  
FIELD SUBFIELD
Field 06 - Manufacturing, Engineering and Technology Engineering and Related Design 
ABET BAND UNIT STANDARD TYPE PRE-2009 NQF LEVEL NQF LEVEL CREDITS
Undefined  Regular  Level 5  Level TBA: Pre-2009 was L5  10 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Passed the End Date -
Status was "Registered" 		 2001-06-13  2004-06-13  SAQA 0836/01 
LAST DATE FOR ENROLMENT LAST DATE FOR ACHIEVEMENT
2005-06-13   2008-06-13  

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 
Explain vibration produced by mechanical equipment in air-conditioning and refrigeration installations and propose effective measures to control vibration transmission by this equipment to the building structure and the environment. 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
Basic understanding of mechanics, particularly force-mass-acceleration, work-energy, and impulse-momentum relationships
Knowledge of rotating equipment used in air-conditioning, refrigeration and ventilation 

UNIT STANDARD RANGE 
Vibration isolators, hangers and pads. Sources of vibration and methods of elimination. Piping, compressor bases, fans, vibration isolators, hangers and pads. 

Specific Outcomes and Assessment Criteria: 

SPECIFIC OUTCOME 1 
Explain and discuss the principles of vibration. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. Vibration theory is explained as a basis for a simplified approach to application and sizing of isolators. 

ASSESSMENT CRITERION 2 
2. Vibration and damping is defined. 
ASSESSMENT CRITERION RANGE 
Force, displacement, acceleration, frequency
 

ASSESSMENT CRITERION 3 
3. The phenomenon of resonance is explained and its implications discussed. 

ASSESSMENT CRITERION 4 
4. The impact of vibration due to material limitations or human factors is explained. 

SPECIFIC OUTCOME 2 
Identify sources of vibration and explain the purpose of vibration control measures. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. Sources of vibration are identified. 

ASSESSMENT CRITERION 2 
2. The various anti-vibration mountings used in the air-conditioning, refrigeration and ventilation industry are identified. 

ASSESSMENT CRITERION 3 
3. The purpose of the various anti-vibration mountings are discussed and explained. 

ASSESSMENT CRITERION 4 
4. The basic construction of anti-vibration mountings is discussed and their basic geometry explained. 

SPECIFIC OUTCOME 3 
Discuss methods of isolating vibration. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. The various methods of vibration isolation are explained. 

ASSESSMENT CRITERION 2 
2. Influence of vibration on process performance and equipment life is explained. 

ASSESSMENT CRITERION 3 
3. Common applications of specific anti-vibration mountings are discussed and applicable isolator characteristics explained. 

SPECIFIC OUTCOME 4 
Select vibration isolators. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. Vibration isolators are selected from catalogues or computerised programs. 

ASSESSMENT CRITERION 2 
2. Advantages and limitations of anti-vibration mountings for specific applications are discussed. 

ASSESSMENT CRITERION 3 
3. The consequences of no or incorrect vibration isolation selection are listed and discussed. 


UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS 
Any person wishing to be assessed against this unit standard may apply to an assessment agency, assessor or provider institution accredited by the relevant ETQA, who may appoint a moderator to be present at the assessment.

The assessor must have knowledge and experience of air-conditioning or refrigeration. 

UNIT STANDARD ESSENTIAL EMBEDDED KNOWLEDGE 
  • Knowledge of various types of anti-vibration mountings.
  • Physical properties of anti-vibration mountings.
  • Occupational Health and Safety Act requirements regarding vibration and resulting noise.
  • Knowledge of basic vibration theory. 
    		•


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Identify and solve problems
  • Selection of correct anti-vibration mounting for particular application 
    		•

    UNIT STANDARD CCFO COMMUNICATING 
    Communicate effectively
  • Communicate with artisans and engineers 
    		•

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically
  • Using catalogues or computerized programs in selection of anti-vibration mountings 
    		•

    UNIT STANDARD CCFO DEMONSTRATING 
    Demonstrate an understanding of the world as a set of related systems
  • Impact of failure to comply with vibration isolation and control on environment and people 
    		•

    UNIT STANDARD CCFO CONTRIBUTING 
    Learner and societal development
  • Learning the basic principles of vibration and methods of isolation 
    		•

    UNIT STANDARD NOTES 
    Specific requirements are contained in one or more of the following documents:
  • Manufacturer`s instructions and technical information.
  • Occupational Health and Safety Act. 
    		•

    QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Core  20722   National Diploma: Air Conditioning, Refrigeration and Ventilation  Level 5  Level TBA: Pre-2009 was L5  Passed the End Date -
    Status was "Registered"     		 2004-06-13  MERSETA 


    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.