12457 version 4
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Design a cathodic protection system in a gas distribution network
Level
6
Credits
12
Purpose
People credited with this unit standard are able to demonstrate knowledge of
cathodic protection systems in a gas distribution network, and produce
design specifications for a cathodic protection system.
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;
Resource Management Act 1991;
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).
4
Definition
 New Zealand Qualifications Authority 2016
12457 version 4
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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
Demonstrate knowledge of cathodic protection systems in a gas distribution network.
Performance criteria
1.1
Principles of operation of cathodic protection systems are explained in terms of
industry usage.
Range
rectifier impressed current, anode beds, galvanic anodes, test
points.
1.2
The relevance of cathodic protection systems to functional performance, and
security requirements of gas networks is explained in terms of industry usage.
1.3
Equipment used for cathodic protection systems is described in terms of
function and industry usage.
Range
copper sulphate half cell, multimeter, data logger, analogue to
digital converter, cathodic protection system interruption device,
direct current voltage gradient meter, pipe locater, flange isolation
tester, sacrificial anodes, ground beds, transformers, rectifiers,
insulation, cross bonding, Holiday detector.
Element 2
Produce design specifications for a cathodic protection system.
Performance criteria
2.1
The need to design a cathodic protection system is identified to meet system
requirements in accordance with company procedures.
2.2
Parameters are acquired to establish current requirements for cathodic
protection system in accordance with company procedures.
Range
2.3
Current generation type is established for acquired parameters in accordance
with company procedures.
Range
2.4
pipe surface area, type of coating, soil conditions, other
underground services.
sacrificial anode, impressed current.
Sacrificial anode requirements are established from soil resistivity, ground bed
size and design and physical factors.
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2.5
Impressed current requirements are established from soil resistivity and desired
life span.
2.6
Completed design specifications for cathodic protection systems are produced
in accordance with company procedures and NZS 5258.
Range
2.7
statutory considerations, overall design requirements, construction
considerations, commissioning and recommissioning, alterations
to live mains and services, corrosion protection, system
monitoring, maintenance and records.
Design plans for cathodic protection systems are prepared and include
environmental considerations in accordance with company procedures.
Range
aesthetics, disposal, life time of system, manufacturability,
compatibility with existing system, upgrade potential, other utilities,
test point location.
2.8
Logistical requirements, including timetables for deliverables, are prepared in
accordance with company procedures.
2.9
Produced design specifications for cathodic protection systems are in the
agreed format and style and are completed by the agreed time in accordance
with company procedures.
Range
locations, layouts and routes, definitions, glossary of terms.
2.10
Produced design specification is documented and includes current version
number and date produced in accordance with company procedures.
2.11
Produced design specification is filed and is available to authorised users in
accordance with company procedures.
Range
2.12
authorised users – customers, manufacturing, management,
technical experts.
Produced design specifications for cathodic protection are distributed to
authorised personnel promptly on completion of design, and an up-to-date
register of specification holders is maintained in accordance with company
procedures.
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.
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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