18421 version 2
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Demonstrate knowledge of the application of compression equipment in
the gas transmission industry
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, in the gas transmission industry,
able to demonstrate knowledge of: the application of compression and
compressor drive equipment; the design, construction, and application of gas
compression equipment; and the application of the ancillary equipment
required for compression equipment.
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 note
1
Performance of the elements of this unit standard must comply with relevant site
requirements and the following legislation:
Health and Safety in Employment Act 1992;
Health and Safety in Employment (Pipelines) Regulations 1999;
Resource Management Act 1991.
2
Definition
 New Zealand Qualifications Authority 2016
18421 version 2
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SCADA refers to Supervisory Control and Data Acquisition.
Elements and performance criteria
Element 1
Demonstrate knowledge of the application of compression and compressor drive
equipment in the gas transmission industry.
Range
may include but is not limited to – reciprocating compressor, centrifugal
compressor, internal combustion engine, gas turbine engine, electric motor.
Performance criteria
1.1
The need for compression equipment is explained in terms of its use in the gas
transmission industry.
Range
1.2
Gas law relationships are explained with reference to compression activities in
the gas transmission industry.
Range
1.3
Charles law, Boyle’s law.
Industry terms associated with gas compression equipment are defined in terms
of their use in the gas transmission industry.
Range
1.4
may include but is not limited to – maintaining flow rate,
maintaining pressure, process requirements, line packing.
may include but is not limited to – suction, discharge, compression
ratio, compressor efficiency, bypass, surge, compression by
volume decrease, compression by velocity increase, pressure
control, over pressure protection.
Gas compression equipment driver types are described in terms of their use in
a gas transmission industry.
Range
internal combustion stationary engine, turbine engine, electric
motor, size, power output, auxiliary equipment requirements,
variable speed drives.
Element 2
Demonstrate knowledge of the design, construction, and application of gas compression
equipment in the gas transmission industry.
Range
reciprocating compressor, centrifugal compressor, multi-stage compression.
Performance criteria
2.1
The function of each component of gas compression equipment is described in
accordance with manufacturer’s instructions.
 New Zealand Qualifications Authority 2016
18421 version 2
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2.2
Application of gas compression equipment is described in relation to system
requirements.
Range
may include but is not limited to – volume capacity, pressure
requirement, power, size, efficiency, noise output, redundancy
requirements, cost.
Element 3
Demonstrate knowledge of the application of ancillary equipment required for compression
equipment in the gas transmission industry.
Performance criteria
3.1
The ancillary equipment required for compression equipment is identified and
its function explained.
Range
3.2
may include but is not limited to – control systems, trip systems,
detection systems, loading systems, motor drives, couplings,
SCADA systems, load sharing, emergency shutdown systems,
filtration, scrubbers, cooling, sealing, separation equipment,
dryers, lubrication.
The purpose of an anti-surge control system is described in terms of its
application to a gas turbine engine driven compressor.
Range
low flow, high differential pressure, prevention of compressor stall,
induced vibration, surge valve, surgeline for compressor, recycle.
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