22920 version 2
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Demonstrate and apply knowledge of fluid power in mechanical
engineering
Level
6
Credits
15
Purpose
This unit standard is intended primarily for use in diploma courses in
mechanical engineering. It covers knowledge of fluid power, and its
application to scenarios or simulations of industrial situations.
People credited with this unit standard are able to: demonstrate knowledge of
fluid power diagrams and fluid power equipment; design and draw fluid power
circuits; and evaluate the use of fluid power technology for a proposed
industrial application.
Subfield
Mechanical Engineering
Domain
Applied Principles of Mechanical Engineering
Status
Registered
Status date
26 November 2007
Date version published
19 March 2010
Planned review date
31 December 2015
Entry information
Open.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
Competenz
Accreditation and Moderation Action Plan (AMAP) reference
0013
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
The credit value of this unit standard has been calculated on the basis that people
seeking credit have previously acquired competence in the transposition of formulae,
the manipulation of equations, and the use of trigonometric functions; and have
previously acquired understanding of fundamental concepts of physics (mass, length,
and time) and their derived units, including pressure, force, gravitational effect,
velocity, acceleration, and energy.
 New Zealand Qualifications Authority 2016
22920 version 2
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2
References
Health and Safety in Employment Act 1992.
ISO 1219-1:2006, Fluid power systems and components – Graphic symbols and
circuit diagrams – Part 1: Graphic symbols for conventional use and data-processing
applications.
3
Definitions
FRL – Filter, Regulator, Lubricator.
Hydraulic equipment refers to pumps and systems which may include but are not
limited to reservoirs, accumulators, pipework and fittings, seals, fluids, valves,
actuators.
Industry practice – the application of relevant legislation, regulations, standards,
codes, and safe and sound practices generally accepted by competent practitioners
within the fluid power industry.
Pneumatic equipment refers to air compressors and systems which may include but
are not limited to, coolers and dryers, receivers, distribution systems, pipework and
fittings, drain traps, FRL air service units, valves, actuators, seals.
Elements and performance criteria
Element 1
Demonstrate knowledge of fluid power diagrams.
Performance criteria
1.1
Fluid power symbols are identified and their meanings described in accordance
with ISO 1219-1.
Range
1.2
Fluid power diagrams are analysed and their applications are described.
Range
1.3
symbols may include but are not limited to – pneumatic, hydraulic,
energy conversion, valve, energy transmission, control.
fluid power diagrams – system-layout and circuit diagrams;
applications may include but are not limited to – logic, memory and
multi-actuator sequential circuit operation, cascading techniques,
circuits covering both linear and rotary actuation.
A pneumatic or hydraulic multi-actuator sequential operation is analysed and
described in terms of its design.
 New Zealand Qualifications Authority 2016
22920 version 2
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Element 2
Demonstrate knowledge of fluid power equipment.
Range
evidence of at least three pneumatic and three hydraulic items of equipment is
required.
Performance criteria
2.1
Items of pneumatic and hydraulic equipment are identified and described in
terms of their operation and construction.
2.2
Items of pneumatic and hydraulic equipment are analysed in terms of their
performance characteristics.
Range
performance characteristics of pneumatic equipment may include
but are not limited to – volumetric efficiency, compression ratio,
isothermal efficiency;
performance characteristics of hydraulic equipment may include
but are not limited to – operating efficiency, losses, flow rate, shaft
torque and power, hydraulic power.
Element 3
Design and draw fluid power circuits.
Performance criteria
3.1
A circuit for a pneumatic or hydraulic multi-actuator sequential operation which
includes emergency stop functions is designed and drawn in accordance with
industry practice.
3.2
A pneumatic or hydraulic rotary-actuation circuit which illustrates speed control
in both directions is designed and drawn in accordance with industry practice.
3.3
An electro-pneumatic or electro-hydraulic circuit arrangement is designed and
drawn in accordance with industry practice.
3.4
An emergency ‘fail safe’ circuit for a pneumatic or hydraulic application is
designed and drawn in accordance with industry practice.
Element 4
Evaluate the use of fluid power technology for a proposed industrial application.
Performance criteria
4.1
The advantages and disadvantages of fluid power technology compared to
other technologies for a proposed industrial application are analysed.
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4.2
The commercial and technical aspects of the use of fluid power technology for a
proposed industrial application are analysed.
4.3
The legal health and safety requirements that need to be addressed in the
design, installation, maintenance, and use of a fluid power system for a
proposed industrial application are identified.
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 Competenz info@competenz.org.nz if you wish to suggest changes to the
content of this unit standard.
 New Zealand Qualifications Authority 2016