12525 version 4
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Select gas pressure control equipment for use in a gas distribution
network
Level
5
Credits
8
Purpose
People credited with this unit standard are able to: select gas pressure
regulators for use in a gas distribution network; and select system protection
equipment for use in a gas distribution network.
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
Prerequisite: Unit 19554, Demonstrate knowledge of
advanced gas pressure control equipment, or
demonstrate equivalent knowledge and skills.
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. The
range statements relate to enterprise specific equipment, procedures, and
processes.
 New Zealand Qualifications Authority 2016
12525 version 4
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2
The current version of the following documents must be complied with:
Gas Act 1992;
Health and Safety in Employment Act 1992;
Resource Management Act 1991;
Gas Regulations 1993;
NZS 5258:2003 Gas distribution networks available at http://www.standards.co.nz/;
Gas industry requirements and codes of practice;
International Standards Organisation (ISO) 9000.
3
All work practices must comply with regulations and codes of practice pertaining to
the gas industry. A full list of applicable regulations and codes is available from the
NZ Motor Industry Training Organisation (Incorporated) (MITO).
4
Definition
Company procedures means the documented methods for performing work activities
and include health and safety, environmental, and quality management requirements.
They may refer to manuals, codes of practice, or policy statements.
Elements and performance criteria
Element 1
Select gas pressure regulators for use in a gas distribution network.
Performance criteria
1.1
The recovery characteristics of commonly used regulator types are described in
terms of effect on network.
Range
speed of response, droop.
1.2
The development of gas flow equations and empirically derived coefficients C1,
Cv, and Cg are explained in terms of gas industry application.
1.3
The use of the universal gas sizing equation is demonstrated to determine the
flow of gas through any type of regulator in accordance with industry practice.
1.4
Gas regulators are selected in accordance with manufacturer’s sizing tables.
1.5
Regulators are selected for specific applications in accordance with company
procedures and industry practice.
Element 2
Select system protection equipment for use in a gas distribution network.
Performance criteria
2.1
Legal requirements for the protection of gas network systems are explained in
terms of industry usage.
Range
under pressure, over pressure, excess flow, flow direction.
 New Zealand Qualifications Authority 2016
12525 version 4
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2.2
The function and use of types of pressure protection devices are explained in
terms of application.
Range
2.3
function – full relief, partial relief;
types – self-operating relief valves, pilot-operated relief valves,
automatic shut-off valves, excess flow valve, non-return valves,
monitor regulator.
System protection equipment is selected in accordance with manufacturer’s
sizing tables.
Range
full relief, partial relief;
equipment – self-operating relief valves, pilot-operated relief
valves, automatic shut-off valves, excess flow valve, non-return
valves, monitor regulator.
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