Burners 3u6s

12449 version 4 Page 1 of 3

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

ed

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.

Elements and performance criteria

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New Zealand Qualifications Authority

12449 version 4 Page 2 of 3 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 of the principles of physics and chemistry. Range

1.2

Heat transfer principles are defined and related to gas burner systems design in of industry usage. Range

1.3

conduction, convection, radiation.

The requirements for combustion are defined and their role explained in 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 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 of usage in domestic and industrial environments. Range

2.2

Component parts of burners are described in 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 of natural draught and forced draught.

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New Zealand Qualifications Authority

12449 version 4 Page 3 of 3 2.4

Faults in burner operation are described in 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 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 of pressure operated systems and electrically operated systems.

2.7

Types of flame protection system for gas burners are described in 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 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 the NZ Motor Industry Training Organisation (Incorporated) (MITO) [email protected] if you wish to suggest changes to the content of this unit standard.

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New Zealand Qualifications Authority