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Title / Read and interpret gas metering equipment
Level / 3 / Credits / 15
Purpose / People credited with this unit standard are able to: demonstrate knowledge of the types, principles, design, construction, and application of low capacity gas pressure control equipment; describe the types, operation, application, and handling of meters and correctors used in a gas network; describe the effect of pressure, temperature and altitude on a GMS; identify equipment and procedures for reading and interpreting gas metering equipment; and use equipment and procedures for gas meter reading.
Classification / Gas Industry > Gas Measurement
Available grade / Achieved
Guidance Information
1This unit standard is intended for, but is not limited to, workplace assessment. The range statements relate to enterprise specific equipment, procedures, and processes.
2Evidence presented for assessment against this unit standard must be consistent with safe working practices and be in accordance with applicable manufacturer’s specifications, company procedures and legislative requirements.
3Performance of the outcomes of this unit standard must comply with the following:
Health and Safety at Work Act 2015;
Health and Safety in Employment (Pipelines) Regulations 1999;
Gas Act 1992;
Gas (Safety and Measurement) Regulations 2010;
Resource Management Act 1991;
Hazardous Substances and New Organisms Act 1996;
AS/NZS 4645.1:2008Gas distribution networks – Network management;
NZS 5259:2015Gas measurement.
4References
Australian/New Zealand standards (AS/NZS) may be found at
New Zealand standards (NZS) may be found at
5Any new, amended or replacement Acts, regulations, standards, codes of practice, guidelines, or authority requirements or conditions affecting this unit standard will take precedence for assessment purposes, pending review of this unit standard.
6Definitions
Company procedures mean the documented methods for performing work activities, and include health and safety, operational, environmental, and quality management requirements. They may refer to legislation, regulations, guidelines, standard operating procedures, manuals, codes of practice, or policy statements.
Company requirements may influence what equipment and procedures are used for a particular job; for example, service level agreements, financial requirements, technical requirements, regulatory requirements, safety requirements, information requirements.
GMS means gas measurement system.
Low capacity gas pressure control equipment excludes pilot-operated regulators, and active monitor and automatic stream selection configurations.
Meters in this unit standard means meters up to and including 25 cubic metres per hour.
Opso means over-pressure shut-off.
Upso means under-pressure shut-off.
7Range
Evidence is required of reading and interpreting industrial meters and either domestic or commercial meters.
Outcomes and performance criteria
Outcome 1
Demonstrate knowledge of the types and principles of low capacity gas pressure control equipment.
Performance criteria
1.1The three basic elements of pressure control equipment are identified and described in terms of their function.
1.2Components of gas pressure control equipment are defined according to gas industry terminology.
Rangespring, valve, valve seat, diaphragm, valve stem/spindle, internal relief, breather, orifice, pilot, weight.
1.3Low capacity gas pressure control equipment and symbols are identified and described according to gas industry terminology.
Rangeregulators, slam shut, upso valve, opso valve, relief valve.
1.4Low capacity gas pressure control equipment types are identified and their features described in terms of gas industry application.
1.5Low capacity gas pressure control equipment is described in terms of principles of operation and application.
Rangeinternal relief, separate relief, regulators, upso valve, opso valve, slam shut, stage control.
Outcome 2
Demonstrate knowledge of the design, construction, and application of low capacity gas pressure control equipment.
Performance criteria
2.1Functions of each component of low capacity gas pressure control equipment are described according to manufacturer’s specifications.
Rangediaphragm, seat, spring, orifice, vent.
2.2Application of low capacity gas pressure control equipment is described in terms of system requirements.
Rangepressure, flow, control systems, location, configuration.
2.3Design and construction features of low capacity gas pressure control equipment are described according to system requirements and manufacturer's specifications.
Rangematerials, pressure, flow, location, droop, speed of response.
2.4Typical pressure control equipment configurations are described in terms of industry usage.
Rangemay include sketches.
Outcome 3
Describe the types, operation, application, and handling of meters used in a gas network.
Performance criteria
3.1Types of meters are identified and described according to system requirements and company procedures.
Rangediaphragm, turbine, rotary, ultrasonic;
fixed factor, time of use.
3.2Operation of meters is described according to system requirements.
Rangediaphragm, turbine, rotary, ultrasonic.
3.3Applications of meters are described according to system requirements.
Rangedomestic, commercial, industrial, internal, external.
3.4Storage, handling, and transportation requirements for meters are described.
Rangepackaging, protection, position, orientation, securing, seals.
Outcome 4
Describe the types, operation, application, and handling of correctors used in a gas network.
Performance criteria
4.1Types of correctors are described according to system requirements.
Rangeelectronic, pressure, temperature, absolute, gauge.
4.2The operation of correctors is described according to system requirements.
4.3Applications and compliance requirements of different types of correctors are described according to system requirements.
Rangecommercial, industrial, internal, external.
4.4Storage, handling, and transportation requirements for correctors are described.
Rangepackaging, protection, position, orientation, securing, seals.
Outcome 5
Describe the effect of pressure, temperature and altitude on a GMS.
RangeNZS 5259.
Performance criteria
5.1The effects of pressure on a GMS are described.
5.2The effects of temperature on a GMS are described.
5.3The effects of altitude on a GMS are described.
Outcome 6
Identify equipment and procedures for reading and interpreting gas metering equipment.
Performance criteria
6.1Metering equipment and meter reading equipment are described according to types and component parts.
Rangemetering equipment – meters, correctors, data logger;
meter reading equipment – meter record sheets, calculator, calling card, security access, site access, keys, electronic devices.
6.2Procedures for reading meters are located and interpreted.
Rangemeter reading, documentation, customer liaison, faults.
6.3Functions and applications of meter reading equipment are described according to design and company requirements.
Rangebilling, corrected readings, uncorrected readings, digital, analog, imperial, metric.
Outcome 7
Use equipment and procedures for gas meter reading.
Performance criteria
7.1Procedures used for reading meters comply with company requirements.
Rangemeter reading, documentation, customer liaison, faults.
7.2Equipment is used to read meters.
Rangedata logger, calculator, record sheets.
7.3The potential risks of incorrect application and operation of equipment and procedures are identified, and the steps to avoid them are described.
Rangeincorrect readings, dogs and site risks, systems shut-down.
7.4Records and documents are completed and supplied to internal bodies and personnel for meter information.
Rangebilling, recommendation, fault notification, risks.
Replacement information / This unit standard replaced unit standard 12450, unit standard 23084, and unit standard 23088.Planned review date / 31 December 2022
Status information and last date for assessment for superseded versions
Process / Version / Date / Last Date for AssessmentRegistration / 1 / 17 August2017 / N/A
Consent and Moderation Requirements (CMR) reference / 0014
This CMR can be accessed at
Comments on this unit standard
Please contact MITO New Zealand Incorporated you wish to suggest changes to the content of this unit standard.
MITO New Zealand IncorporatedSSB Code 101542 / New Zealand Qualifications Authority 2018