24531 version 2
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Demonstrate and apply knowledge of piped services system design
Level
6
Credits
15
Purpose
This unit standard is intended for use in diploma courses in mechanical
engineering, and covers knowledge and design of piped services systems for
heating, ventilating, and air conditioning (HVAC) applications. Piped services
refers to the distribution by pipe of potentially hazardous liquids and gases
within buildings.
People credited with this unit standard are able to: demonstrate knowledge
of, design, select components for, and prepare design documents for piped
services systems.
Subfield
Mechanical Engineering
Domain
Applied Principles of Mechanical Engineering
Status
Registered
Status date
14 December 2007
Date version published
19 March 2010
Planned review date
31 December 2015
Entry information
Recommended: Unit 11385, Demonstrate and apply
knowledge of fluid mechanics in mechanical
engineering; and Unit 21781, Explain and apply laws of
thermodynamics in mechanical engineering; or
demonstrate equivalent knowledge and skills.
Replacement information
This unit standard replaced unit standard 3208, unit
standard 3209, unit standard 3212, and unit standard
3213.
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.
 New Zealand Qualifications Authority 2016
24531 version 2
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Special notes
1
References
Building Act 2004;
Building Code. Available from http://www.dbh.govt.nz/bcl-get-a-copy-of-buildingcode.
Department of Building and Housing compliance documents for the New Zealand
Building Code (compliance documents). Available at
http://www.dbh.govt.nz/building-code-compliance-documents.
2
Definitions
Industry practice – the application of relevant legislation, regulations, standards,
codes, and safe and sound practices, generally accepted by competent practitioners
within the mechanical building services industry.
LPG – Liquefied Petroleum Gas.
3
Range
a The performance of elements 2, 3, and 4 must reflect compliance with relevant
legislation, regulations, standards, and codes of practice.
b Piped services systems – steam, condensate, medical gases, medical vacuum,
compressed air, oxygen, acetylene, natural gas, LPG, diesel fuel, domestic hot
and cold water.
Elements and performance criteria
Element 1
Demonstrate knowledge of piped services systems.
Performance criteria
1.1
The principles of piped services systems are explained with reference to
components, methods of production, storage, distribution, and system
parameters.
Range
1.2
system parameters – heat transfer; pressures; temperatures;
control of capacity, pressure, temperature, and corrosion; energy
use; quality of supplied services; health and safety.
The operating principles of components used in piped services systems are
described with reference to operation, construction, and capacity.
Range
components may include – boilers, burners, flues, tanks, traps,
heat exchangers, pumps, compressors, vacuum pumps, cylinders,
pipes and associated fittings, insulation, pressure controls,
temperature controls, safety devices.
 New Zealand Qualifications Authority 2016
24531 version 2
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Element 2
Design piped services systems.
Range
evidence of the design of two different types of systems is required.
Performance criteria
2.1
Design provides a viable solution to the given requirements in accordance with
industry practice.
2.2
Relevant parameters are determined in accordance with industry practice.
Range
2.3
parameters – load, flow rate, pressure drop, control authority,
provision for expansion and contraction, energy use.
Design demonstrates sound methodology of analysis and use of relevant
source, data in accordance with industry practice.
Range
source data – building data; thermo-physical data for steam, air,
gases, water; performance data for system components; units of
measurement; regulations; standards; codes of practice.
Element 3
Select components for piped services systems.
Range
components may include – boilers, burners, flues, tanks, traps, heat
exchangers, pumps, compressors, vacuum pumps, cylinders, pipes and
associated fittings, insulation, pressure controls, temperature controls, safety
devices;
selection of components for two different types of piped services systems is
required.
Performance criteria
3.1
Component ratings are appropriate for the loads imposed on them in
accordance with industry practice.
Range
3.2
ratings – flow rate, working pressure, working temperature, heat
transfer capacity, maximum pressure, maximum temperature.
Selected components are suitable for the applications in accordance with
industry practice.
Range
suitability may include consideration of – function, durability, noise
level, reliability, efficiency, ability to fit within available space,
ability to be maintained.
 New Zealand Qualifications Authority 2016
24531 version 2
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Element 4
Prepare design documents for piped services systems.
Range
documentation for two different types of systems is required.
Performance criteria
4.1
Documentation includes sketch plans showing the physical location of all
components within the building in accordance with industry practice.
4.2
Documentation includes schematic drawings showing the interconnection of all
components in accordance with industry practice.
4.3
Documentation includes specification of all components in accordance with
industry practice.
4.4
Documentation includes operating description of the overall system, and its
components, prediction of energy use, and indicates key parameters and how
they are measured in accordance with industry practice.
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