12524 version 4
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Demonstrate knowledge of gas properties and characteristics
Level
4
Credits
2
Purpose
People credited with this unit standard are able to demonstrate knowledge of
gas characteristics and the ignition and flammability properties of gas.
Subfield
Gas Industry
Domain
Gas Network Operations
Status
Registered
Status date
20 November 2006
Date version published
20 November 2006
Planned review date
31 December 2011
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
1
This unit standard is intended for, but not limited to, workplace assessment.
2
The main reference for this unit standard is the current version of NZS 5442:1999
Specification for reticulated natural gas available at http://www.standards.co.nz.
3
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
12524 version 4
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Elements and performance criteria
Element 1
Demonstrate knowledge of gas characteristics.
Performance criteria
1.1
Terms used to define gas characteristics are explained in relation to industry
usage.
Range
1.2
Gas specifications are calculated from sample gas compositions in accordance
with industry practice.
Range
1.3
specific gravity, molecular weight, calorific value, Wobbe index.
specific gravity, molecular weight, calorific value, Wobbe index.
The effects of gas characteristics on the sensitivity of viscosity are explained in
terms of industry practice.
Range
temperature, pressure, gas composition.
Element 2
Demonstrate knowledge of the ignition and flammability properties of gas.
Performance criteria
2.1
The properties of gas ignition and flammability are defined in terms of industry
usage.
Range
2.2
flammability limits, lower explosive limits, higher explosive limits,
ignition temperatures.
The properties of specific gravity, ignition, and flammability are explained in
terms of their effect on the safe use of gas transported in pipelines.
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.
 New Zealand Qualifications Authority 2016
12524 version 4
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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