18417 version 2
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Perform maintenance on a metering system on a gas transmission
pipeline system
Level
4
Credits
6
Purpose
This unit standard is for people working, or intending to work, in the gas
transmission industry.
People credited with this unit standard are, on a gas transmission pipeline
system, able to: demonstrate knowledge of metering systems; check and
maintain metering systems; and place a metering system back into service
after maintenance.
Subfield
Gas Industry
Domain
Gas Transmission Operations
Status
Registered
Status date
22 May 2009
Date version published
22 May 2009
Planned review date
31 December 2014
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
Performance of the elements of this unit standard must comply with relevant site
requirements, and the following legislation and standard:
Health and Safety in Employment Act 1992;
Health and Safety in Employment (Pipelines) Regulations 1999;
Resource Management Act 1991;
NZS/AS 2885.1:1997 Pipelines – Gas and liquid petroleum – Design and
construction.
 New Zealand Qualifications Authority 2016
18417 version 2
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2
Definition
Company procedures refer to the documented methods for performing work activities
and include health and safety, environmental, site requirements, and quality
management requirements. They may refer to manuals, codes of practice, or policy
statements.
Elements and performance criteria
Element 1
Demonstrate knowledge of metering systems on a gas transmission pipeline system.
Performance criteria
1.1
The need for a metering system on a gas transmission pipeline system is
explained.
Range
1.2
The component parts and types of metering systems are identified and each
component’s function is explained in relation to the type of metering system.
Range
1.3
may include but is not limited to – meter tube valving, positive
displacement type meter, velocity type meter, mass type meter,
orifice plate, flow transmitter, pressure transmitter, temperature
transmitter, density analyser, specific gravity analyser,
chromatograph, flow corrector, flow computer.
Documentation for maintaining a metering system is located and explained in
accordance with company procedures.
Range
1.4
may include but is not limited to – custody transfer, process flow
indication, check metering, leak detection, reconciliation.
may include but is not limited to – maintenance management
system; manufacturer’s operating instructions, company safety
procedures, sales agreements, regulatory requirements, current
calibration certificates.
Potential hazards associated with metering system maintenance are identified
and the steps to control them are explained in accordance with company
procedures.
Range
may include but is not limited to – flammable product, high
pressure, loss of product supply to customer, company emergency
procedures, loss of customer data supply, metering inaccuracies.
 New Zealand Qualifications Authority 2016
18417 version 2
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Element 2
Check and maintain metering systems on a gas transmission pipeline system.
Performance criteria
2.1
Planned activities are communicated with appropriate personnel prior to
performing maintenance on metering systems.
Range
2.2
Safety checks and pre-start checks are conducted to determine the operational
condition of the metering equipment in accordance with company procedures
and manufacturer’s instructions.
Range
2.3
may include but is not limited to – leak checks, alarm checks,
equipment status, computer programme content checks.
Calibration checks and adjustments are carried out to ensure the accuracy of
the metering equipment in accordance with company procedures and
manufacturer’s instructions.
Range
2.4
personnel may include but are not limited to – control room, area
technicians, data processing and billing group, customers.
may include but is not limited to – calibration equipment,
laboratory accuracy certificates, accuracy requirements,
calibration gases, flow correction systems.
Incorrect application and operation of equipment and procedures are described
in terms of consequences.
Range
may include but is not limited to – metering system inaccuracies,
flow restrictions, unstable processes.
Element 3
Place a metering system back into service after maintenance on a gas transmission
pipeline system.
Performance criteria
3.1
Checks for correct connection and ready for service state are carried out in
accordance with company procedures.
Range
3.2
may include but is not limited to – isolation valving, alarms,
purging, sampling systems, vents, equalising valves, utilities.
Communication of the intended work activities with appropriate personnel prior
to the placing of the metering system back into service is carried out in
accordance with company procedures.
Range
may include but is not limited to – control room, customer, area
technicians.
 New Zealand Qualifications Authority 2016
18417 version 2
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3.3
The metering system is placed back into service in accordance with company
procedures.
3.4
The metering system is monitored on-line to ensure correct operation after
being placed back into service.
Range
3.5
monitoring may include but is not limited to – alarms, flow rate
indication, flow correction verification checks, data processing and
billing issues.
Meter installation documentation is completed and communication is carried out
in accordance with company procedures.
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