12438 version 4
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Identify and utilise the principles of gas flow dynamics for network
system design
Level
4
Credits
12
Purpose
People credited with this unit standard are able to define the principles of gas
flow dynamics as related to gas supply system design, and demonstrate
knowledge of the principles of gas network analysis.
Subfield
Gas Industry
Domain
Gas Network Planning and Development
Status
Registered
Status date
25 September 1997
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 is not limited to, workplace assessment. The
range statements relate to enterprise specific equipment, procedures, and
processes.
2
The current version of the following documents must be complied with:
Health and Safety in Employment Act 1992;
NZS 5258:2003 Gas distribution networks available at http://www.standards.co.nz/;
NZS 5259:2004 Gas measurement available at http://www.standards.co.nz/.
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).
 New Zealand Qualifications Authority 2016
12438 version 4
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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
Define the principles of gas flow dynamics as related to gas supply system design.
Performance criteria
1.1
The principles of flow are defined and related to intermediate, medium, and low
pressure gas supply systems design in accordance with industry usage and
system application.
Range
1.2
laminar, turbulent, streamline.
The principles and causes of pressure loss in a gas network are defined and
related to gas supply systems design in accordance with industry usage and
system application.
Range
length of pipe, quantity of gas flowing, diameter of pipe, specific
gravity of gas, friction losses, diversity factor.
1.3
The principles of gas flow load characteristics analysis are defined and related
to gas supply systems design in accordance with company procedures and
system application.
1.4
Formulae relating to calculations for gas flow dynamics are explained and their
use is demonstrated in accordance with industry usage and system application.
Range
Bernoulli's theorem, flow in pipes and Reynold’s number, Darcy’s
equation, Poiseuille's law, isothermal flow, AGA equations,
Weymouth equation, Panhandle A equation.
Element 2
Demonstrate knowledge of the principles of gas network analysis.
Performance criteria
2.1
The purpose of gas network analysis is explained in terms of industry practice
and company procedures.
2.2
Data elements of network analysis are identified and explained in terms of their
effect on the network.
Range
node identification, pipe sizes and length, demand, source, point
loads, pipe configuration and resistances, supply pressure.
 New Zealand Qualifications Authority 2016
12438 version 4
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2.3
The principles of Kirchoff’s laws are explained in terms of application to gas
network analysis.
2.4
Methods of network analysis used are explained and their use is demonstrated
in terms of application, practicality, accuracy, and usage.
Range
cut and try, Hardy Cross, computer programmes, Mear’s gas flow
calculator.
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