25610 Version 1
Page 1 of 5
Demonstrate knowledge of equipment and operations for jointing
polyethylene pipe for a distribution network
Level
3
Credits
5
Purpose
This unit standard is for people working in the infrastructure pipelaying
industries.
People credited with this unit standard are able to, for a distribution network,
demonstrate knowledge of: optimal conditions when jointing polyethylene
pipe; storing and handling polyethylene pipe and jointing equipment; butt
welding; electrofusion welding; and the requirements for jointing of
polyethylene pipes.
Subfield
Plastics Processing Technology
Domain
Plastics Fabrication
Status
Registered
Status date
20 November 2009
Date version published
20 November 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 notes
1
This unit standard is intended for, but not limited to, workplace assessment. The
range statements relate to enterprise specific equipment, procedures, and
processes.
 New Zealand Qualifications Authority 2016
25610 Version 1
Page 2 of 5
2
Reference documents:
Health and Safety in Employment Act 1992;
Resource Management Act 1991;
AS/NZS 4130: 2009 Polyethylene pipes for pressure applications
Available at http://www.standards.co.nz;
POP001: Electrofusion Jointing of PE Pipe and Fittings for Pressure Applications
(Issue 6.0);
POP003: Butt Fusion Jointing of PE Pipes and Fittings – Recommended Parameters;
POP005: Packaging, Handling and Storage of Polyethylene Pipes and Fittings (Issue
5.0); all available at http://www.pipa.com.au;
Manufacturers instructions.
3
Definitions
Manual butt welding machine is defined as one which allows the heating element to
be rejected manually or automatically.
Semi automatic butt welding machine is defined as one having an interface to
external memory and printer, the welding parameters such as pressure, temperature,
and the time can be stored and printed. The frame close/open is still done manually,
but welding parameters are calculated and controlled by the computer.
Automatic butt welding machine is defined as one having an interface to external
memory and printer, the welding parameters such as pressure, temperature, and
time can be stored and printed. The frame close/open is controlled automatically, and
the welding process is controlled by the computer.
Company procedures means the documented methods for performing work activities
and include health and safety, environmental, and quality management requirements.
They may refer to manuals, codes of practice, or policy statements.
Elements and performance criteria
Element 1
Demonstrate knowledge of optimal conditions when jointing polyethylene pipe for a
distribution network.
Performance criteria
1.1
Optimal pipe jointing environment requirements are identified, and their
relevance to weld quality is described in accordance with the relevant reference
documents and company procedures.
Range
1.2
includes but is not limited to – cleanliness, ambient temperature,
dryness, oxidisation, physical stability, weather.
Non environmental factors that may compromise the integrity of the weld are
identified and appropriate corrective actions are described in accordance with
the relevant reference documents.
Range
evidence for three specific factors is required.
 New Zealand Qualifications Authority 2016
25610 Version 1
Page 3 of 5
Element 2
Demonstrate knowledge of storing and handling polyethylene pipe and jointing equipment
for a distribution network.
Performance criteria
2.1
Storage of up to 280mm diameter pipe and jointing equipment is described in
accordance with the relevant reference documents and company procedures.
Range
2.2
Handling and positioning of up to 280mm diameter pipe and jointing equipment
is described in accordance with the relevant reference documents and company
procedures.
Range
2.3
includes but is not limited to – alignment, weight, lifting equipment,
supports, coils.
Specific storage requirements for pipes of greater than 280mm diameter are
described in accordance with the relevant reference documents and company
procedures.
Range
2.4
height, weight, uv protection, water ingress, coating protection.
evidence of three specific requirements is required.
Specific handling requirements and site preparation requirements for pipes
greater than 280mm diameter are described in accordance with the relevant
reference documents and company procedures.
Range
evidence of three specific requirements is required.
2.5
Inspection of pipe for damage prior to jointing is described in accordance with
the relevant reference documents and company procedures.
2.6
The difference in requirements for field checks in pipes of up to 280mm
diameter and greater than 280mm diameter are described in accordance with
the relevant reference documents and company procedures, and the difference
in these requirements is explained.
Element 3
Demonstrate knowledge of the butt welding of polyethylene pipes for a distribution
network.
Performance criteria
3.1
The butt welding process is described in accordance with the relevant reference
documents and company procedures.
Range
positioning, clamping, facing, cleaning, pre-heating, fusing under
pressure, cooling, releasing.
 New Zealand Qualifications Authority 2016
25610 Version 1
Page 4 of 5
3.2
The components of a manually operated butt welding machine are identified,
and their purpose and main features are described in accordance with the
manufacturer’s documentation.
Range
3.3
Semi-automatic and fully automatic butt welding machines are identified, and
their principle features are described, in accordance with the manufacturer’s
documentation.
Range
3.4
components – machine frame, pipe and fittings clamping and
alignment equipment, hydraulic power system including pressure,
gauge, end facing attachment, heating plate and controls, timing
equipment.
features may include – automatic end facing, automatic weld
cycle, automatic pipe feeding and clamping, precision controls,
automatic data logging.
The advantages and disadvantages of semi automatic and fully automatic butt
welding machines are explained in accordance with the manufacturer’s
documentation.
Range
advantages may include – production output, weld strength, weld
consistency.
Element 4
Demonstrate knowledge of the electrofusion welding of polyethylene pipes for a
distribution network.
4.1
The electrofusion process is described in accordance with the relevant
reference documents and company procedures.
Range
4.2
positioning, clamping, scraping, cleaning, fusing, cooling,
releasing.
Electrofusion jointing equipment and components are identified and their
purpose and main features are described in accordance with manufacturer’s
documentation.
Range
leads, fusion unit, clamps, power source, residual current device,
cutters, scrapers, pipe, fittings.
Element 5
Demonstrate knowledge of the requirements for jointing polyethylene pipes for a network
distribution.
5.1
Compatibility requirements of pipes to be fusion welded together are identified
and described in accordance with the relevant reference documents and
company procedures.
Range
diameter, density, standard dimension ratio (SDR) rating,
roundness.
 New Zealand Qualifications Authority 2016
25610 Version 1
Page 5 of 5
5.2
Common fusion welding faults are identified and methods to avoid them
described in accordance with the relevant reference documents.
Range
5.3
Welded pipe testing methods are described, and their purpose and limitations
are explained in accordance with the relevant reference documents and
company procedures.
Range
5.4
pipe misalignment, cold weld, hot weld, contaminated weld, too
much fusion pressure, too little fusion pressure, influence of
ambient temperature.
may include but not limited to – visual field checks of weld
integrity, pneumatic pressure tests, hydrostatic pressure tests,
tensile tests, bend test, crush test, peel decohesion test, flexural
beam tests, long-term creep tests.
Evidence for at least six methods is required.
The requirement for individual weld traceability is explained, and common
methods for recording and identifying welds are described in accordance with
the relevant reference documents and company procedures.
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