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Carry out a flow stopping operation on a live gas main
Level
4
Credits
12
Purpose
People credited with this unit standard are able to: locate and identify
procedures, documentation, and equipment for carrying out a flow stopping
operation on a live gas main; prepare to install flow stopping equipment on a
live gas main; install equipment and fittings on a live gas main; 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 25611, Demonstrate knowledge of
stopple equipment and operations in a gas distribution
network, or demonstrate equivalent knowledge and
skills.
Replacement information
This unit standard replaced unit standard 10985.
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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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.
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
This unit standard requires a sufficient supply of gas to be maintained in the network
whilst undertaking a flow stop operation.
5
Assessment of this unit standard excludes the work for which the flow stopping
operation was required.
6
Definitions
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.
Flow stopping operation refers to the double block and bleed method using a
combination of any of the following: squeeze offs, flow stopping bags, and valves.
Elements and performance criteria
Element 1
Locate and identify procedures, documentation, and equipment for carrying out a flow
stopping operation on a live gas main.
Performance criteria
1.1
Company procedures for carrying out a flow stopping operation are located and
interpreted in relation to specified job requirements.
1.2
Job instructions and system specifications are confirmed in accordance with
company procedures.
Range
instructions include – site location, utility plans and/or mark-outs,
consents, easements, contingency plan.
1.3
Potential environmental and safety hazards are identified in accordance with
company procedures.
1.4
Equipment is identified and described in terms of type and function and
potential hazards of incorrect operation.
Range
1.5
flow stopping, purge, pipe, jointing, bypass, rider, pressure
monitoring.
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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1.6
Resource requirements are identified and sourced in accordance with company
procedures.
Range
plant, tools, breathing apparatus, fire extinguisher, materials,
documentation, system components, personnel, communication
equipment.
Element 2
Prepare to install flow stopping equipment on a live gas main.
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, gas escape, fire, explosion, asphyxiation,
other utilities, temporary traffic control, environmental protection,
excavations.
Equipment, fittings, and pipe section are prepared in accordance with company
procedures and manufacturer’s instructions.
Range
flow stopping, purge, pipe, jointing, bypass, rider, vent, pressure
monitoring.
Element 3
Install equipment and fittings on a live gas main.
Performance criteria
3.1
Equipment is installed in accordance with company procedures.
Range
flow stopping, purge, jointing, bypass, rider, vent, pressure
monitoring.
3.2
Pressures are monitored, and if applicable, a bypass is commissioned in
accordance with company procedures.
3.3
A section of pipe is decommissioned and the integrity of flow stopping
equipment is checked in accordance with company procedures.
3.4
Equipment is removed and leak test is carried out in accordance with company
procedures.
Range
flow stopping, purge, jointing, bypass, rider, vent, pressure
monitoring.
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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
5.2
may include but is not limited to – special conditions, completion
notice, additional work.
Records and documents are completed and processed in accordance with
company procedures.
Range
may include but is not limited to – job card, as-built, consents,
completion report, pressure monitoring report.
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.
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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