24187 version 1
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Demonstrate knowledge of compressed natural gas (CNG) vehicle fuel
systems
Level
4
Credits
2
Purpose
This theory-based unit standard is for people in the automotive engineering
industry. People credited with this unit standard are able to demonstrate
knowledge of CNG as a gaseous fuel and the associated safety practices
and regulations, and the operation of a CNG fuel system and conversion
requirements.
Subfield
Motor Industry
Domain
Automotive Fuel Systems and Exhaust
Status
Registered
Status date
25 January 2008
Date version published
25 January 2008
Planned review date
31 December 2012
Entry information
Open.
Replacement information
This unit standard and unit standard 24188 replaced unit
standard 954.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
NZ Motor Industry Training Organisation (Incorporated)
Accreditation and Moderation Action Plan (AMAP) reference
0014
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
Legislation and publications relevant to this unit standard include but are not limited
to – Health and Safety in Employment Act 1992; Traffic Regulations 1976; Land
Transport Rules: Vehicle Repair 1998, Rule 34001; Vehicle Standards Compliance
2002, Rule 35001/1; Vehicle Standards Compliance Amendment 2005, Rule
35001/2; New Zealand Standard AS/NZS 2739:2003 Natural gas (CNG) fuel systems
for vehicle engines.
 New Zealand Qualifications Authority 2016
24187 version 1
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2
Land Transport Rules are produced for the Minister of Transport by Land Transport
New Zealand. These rules are available online at
http://www.landtransport.govt.nz/rules/.
New Zealand Standards are available from Standards New Zealand, Private Bag
2439, Wellington; phone 04 498 5990; or website http://www.standards.co.nz.
3
Definition
CNG equipment manufacturer kit instructions refer to specifications and instructions
provided by the equipment manufacturer for the correct installation and operation of
the CNG component(s) or system(s) provided by that manufacturer.
Elements and performance criteria
Element 1
Demonstrate knowledge of CNG as a gaseous fuel and the associated safety practices
and regulations.
Performance criteria
1.1
Safety practices associated with CNG are described in accordance with
legislative requirements and AS/NZS 2739.
Range
1.2
Petrol and CNG usage are compared in accordance with manufacturer
specifications.
Range
1.3
includes but is not limited to – work area and involvement, vehicle
suitability for installation, equipment storage, repairs to the
vehicle's alternative fuel componentry, initial refuelling procedures,
cylinder de-gassing.
characteristics, engine performance, engine and associated
component effects, suitability for vehicle applications.
Regulations relating to CNG installation and vehicle certification are identified in
accordance with legislative requirements.
Element 2
Demonstrate knowledge of the operation of a CNG fuel system and conversion
requirements.
Performance criteria
2.1
The layouts of dual fuel and dedicated CNG fuel systems are described, and the
function of each component defined, in accordance with CNG equipment
manufacturer kit instructions.
2.2
The operation of a fully operational dual fuel system is described in accordance
with CNG equipment manufacturer kit instructions and AS/NZS 2739.
 New Zealand Qualifications Authority 2016
24187 version 1
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2.3
The factors determining the economics of conversion are described in
accordance with customer requirements.
Range
2.4
includes but is not limited to – annual fuel usage, vehicle use and
area of operation, conversion cost, pay-back period.
The procedure when planning the CNG equipment layout on a vehicle is
described in accordance with CNG equipment manufacturer kit instructions.
Range
includes but is not limited to – customer requirements and usage,
suitability of components to the vehicle, determining cylinder size,
type of vehicle and manufacturer design requirements relating to
modifications, conversion equipment specifications.
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)
info@mito.org.nz if you wish to suggest changes to the content of this unit standard.
 New Zealand Qualifications Authority 2016