10972 version 5
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Perform hydrostatic tests on mains and services in a gas distribution
network
Level
4
Credits
7
Purpose
People credited with this unit standard are able to: locate and identify
procedures, documentation, equipment, and fittings for hydrostatic tests on
gas mains and services; prepare for hydrostatic testing on gas mains and
services; carry out hydrostatic pressure test; reinstate site; and complete
reporting and documentation.
Subfield
Gas Industry
Domain
Gas Network Construction
Status
Registered
Status date
21 May 2010
Date version published
21 May 2010
Planned review date
31 December 2015
Entry information
Prerequisite: Unit 25609, Demonstrate knowledge of
hydrostatic testing equipment and operations in a gas
distribution network, 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 is not limited to, workplace assessment. The
range statements relate to enterprise specific equipment, procedures, and
processes.
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10972 version 5
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2
The current version of the following documents must be complied with:
Health and Safety in Employment Act 1992;
Resource Management Act 1991;
Approved Code of Practice for Safety in Excavation and Shafts for Foundations,
Occupational Safety and Health Service, Dept of Labour, 1995, available at
http://www.osh.dol.govt.nz/order/catalogue/135.shtml;
NZS 5258:2003 Gas distribution networks available at http://www.standards.co.nz;
manufacturer’s instructions.
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
Locate and identify procedures, documentation, equipment, and fittings for hydrostatic
tests on gas mains and services.
Performance criteria
1.1
Company procedures for hydrostatic testing are located and interpreted in
relation to specified job requirements.
1.2
Job instructions are confirmed in accordance with company procedures.
Range
instructions include – site location, utility plans and/or mark-outs,
consents, easements, material test certificates.
1.3
Potential environmental and safety hazards are identified in accordance with
company procedures.
1.4
Hydrostatic testing equipment, components and materials are identified and
described in terms of types and function.
Range
1.5
pigs, pig trap, pig catcher, pumps, test equipment, drying medium,
test medium.
Hydrostatic testing equipment is described in terms of potential hazards of
incorrect application and operation, and the steps to avoid them are described
in accordance with company procedures.
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10972 version 5
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1.6
Resource requirements are identified and sourced in accordance with company
procedures.
Range
plant, tools, materials, documentation, system components,
personnel, communication equipment.
Element 2
Prepare for hydrostatic testing on gas mains and services.
Performance criteria
2.1
Safety and environmental hazards are identified, then isolated, removed, or
minimised, in accordance with company procedures.
Range
2.2
may include – signage, barriers, personal protective equipment,
safe access and egress, fire, explosion, asphyxiation, temporary
traffic control, environmental protection, excavations, gas
escapes.
Hydrostatic test equipment is prepared, handled, and positioned in accordance
with company procedures and manufacturer’s instructions.
Range
equipment – pigs, pig trap, pig catcher, pumps, test equipment,
driving medium, test medium.
2.3
Preparation ensures that pipe work and fittings meet specifications and are
anchored in position, pipe systems are isolated, and air vents and drainage
points are positioned in accordance with design and company procedures.
2.4
Test equipment is connected and positioned securely in specified location in
accordance with company procedures.
2.5
Test medium is obtained in accordance with company procedures and local
authority requirements.
Element 3
Carry out hydrostatic pressure test.
Performance criteria
3.1
Hydrostatic test pressure is raised, and pressure level and security of pipe
system are monitored in accordance with company procedures.
3.2
Test equipment and pipe joints are tested for soundness in accordance with
company procedures.
3.3
Stabilisation period is timed in accordance with company procedures.
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3.4
Readings are obtained in accordance with company procedures.
Range
3.5
may include – atmospheric pressure, test pressure, ambient
temperature, ground temperature, water temperature, pH reading,
temperature of test medium.
Test period is timed and recorded in accordance with company procedures.
Range
initial readings, final readings.
3.6
Where test results show a pressure loss, leaks are traced and repaired, and
retesting is completed in accordance with company procedures.
3.7
On completion of the test, pipe is depressurised in a controlled manner and test
equipment is disconnected in accordance with company procedures and
manufacturer's instructions.
3.8
Test medium is disposed of in accordance with company procedures and local
authority requirements.
3.9
Pipe is pigged and dried in accordance with company procedures.
3.10
Record of test is completed in accordance with company procedures.
Element 4
Reinstate site.
Performance criteria
4.1
Equipment and materials left temporarily on site are stored safely and securely,
or arrangements are made for their collection in accordance with company
procedures.
4.2
Tools, equipment, and materials are removed from site in accordance with job
requirements and company procedures.
4.3
Worksite is reinstated and made safe in accordance with company procedures.
Element 5
Complete reporting and documentation.
Performance criteria
5.1
Information is communicated to other parties, both internal and external, in
accordance with company procedures.
Range
may include but is not limited to – special conditions, completion
notice, additional work.
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5.2
Records and documents are completed and processed in accordance with
company procedures.
Range
may include but is not limited to – job card, test sheets, consents.
Please note
Providers must be accredited by NZQA, 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 NZQA 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