12449 version 4
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Demonstrate knowledge of gas combustion, burners, control systems,
and flame protection
Level
4
Credits
15
Purpose
People credited with this unit standard are able to: demonstrate knowledge of
gas combustion and burner systems design; and demonstrate knowledge of
gas burners, control systems, and flame protection systems.
Subfield
Gas Industry
Domain
Gas Utilisation Engineering
Status
Registered
Status date
22 October 2002
Date version published
20 November 2006
Planned review date
31 December 2008
Entry information
Open.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
NZ Motor Industry Training Organisation (Incorporated)
(MITO)
Accreditation and Moderation Action Plan (AMAP) reference
0114
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
Definition
Wobbe index is a number produced when the calorific value of a gas is divided by the
square root of the relative density of that same gas.
 New Zealand Qualifications Authority 2016
12449 version 4
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Elements and performance criteria
Element 1
Demonstrate knowledge of gas combustion, and burner systems design.
Performance criteria
1.1
The combustion characteristics of gas are defined and related to gas burner
systems design in terms of the principles of physics and chemistry.
Range
1.2
Heat transfer principles are defined and related to gas burner systems design in
terms of industry usage.
Range
1.3
conduction, convection, radiation.
The requirements for combustion are defined and their role explained in terms
of physical laws.
Range
1.4
Charles’ law, Boyle’s law, calorific value, gas composition, oxygen
requirements, Wobbe index.
fuel source, ignition source, oxygen.
Causes of incomplete combustion are explained and the potential hazards
identified in terms of industry practice.
Range
lack of oxygen, chilling.
Element 2
Demonstrate knowledge of gas burners, control systems, and flame protection systems.
Performance criteria
2.1
Types of gas burner are described in terms of usage in domestic and industrial
environments.
Range
2.2
Component parts of burners are described in terms of purpose and function.
Range
2.3
pre-aerated burners, post-aerated burners, pre-mix burners,
forced draught burners, radiant burners.
injector, primary air port, aeration control shutter, venturi, venturi
throat, throat restrictor, mixing tube, burner head, burner ports,
retention ports.
Air injection systems are described in terms of natural draught and forced
draught.
 New Zealand Qualifications Authority 2016
12449 version 4
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2.4
Faults in burner operation are described in terms of causes, and the steps to
prevent them are described in accordance with company procedures.
Range
2.5
unstable flame pattern, unsuitable gas flow rate, inadequate air
supply, excessive air supply, linting.
Component parts of control systems for gas burners are described in terms of
purpose, function, and industry usage.
Range
isolation valves, control valves, governor, weep line, test cock,
thermostat.
2.6
Control systems for gas burners are described in terms of pressure operated
systems and electrically operated systems.
2.7
Types of flame protection system for gas burners are described in terms of
purpose and industry usage.
Range
bimetallic, vapour pressure, thermo-electric, flame conduction and
rectification, photo-electric.
Please note
Providers must be accredited by the Qualifications Authority, or an inter-institutional body
with delegated authority for quality assurance, before they can report credits from
assessment against unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by the Qualifications Authority before
they can register credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations
wishing to develop education and training programmes, such as minimum qualifications for
tutors and assessors, and special resource requirements.
Comments on this unit standard
Please contact the NZ Motor Industry Training Organisation (Incorporated) (MITO)
info@mito.org.nz if you wish to suggest changes to the content of this unit standard.
 New Zealand Qualifications Authority 2016