19211 version 3
Page 1 of 3
Describe water supply mains materials and fittings, and causes and
prevention of pipe failure
Level
3
Credits
6
Purpose
People credited with this unit standard are able to describe: the materials and
features of standard classes of water supply pipes, joints and flanges; the
selection criteria, use, and manufacturer’s specifications of fittings, for a
water main; and causes of failure, and methods of prevention of failure, of
water supply pipes.
Subfield
Water Industry
Domain
Water Reticulation
Status
Registered
Status date
19 September 2008
Date version published
19 September 2008
Planned review date
31 December 2013
Entry information
Open.
Accreditation
Evaluation of documentation by NZQA and industry.
Standard setting body (SSB)
Primary Industry Training Organisation
Accreditation and Moderation Action Plan (AMAP) reference
0179
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
None.
 New Zealand Qualifications Authority 2016
19211 version 3
Page 2 of 3
Elements and performance criteria
Element 1
Describe the materials and features of standard classes of water supply pipes, joints and
flanges.
Performance criteria
1.1
Standard classes of water supply pipes are described in terms of their materials
and pipeline features.
Range
1.2
Jointing is described in terms of the techniques for cutting and chamfering of
specified types.
Range
1.3
joint types – mechanical friction joints, rubber ring joints, welded
joints, solvent cement (glued) joints.
Flanges are described in terms of their features.
Range
1.4
materials – cast and ductile iron, steel, asbestos cement,
polyethylene, PVC;
pipeline features – pressure class, dimension, materials, outside
diameters, wall thickness.
features – pressure ratings, sizes.
The reasons for, requirements, and techniques for pressure testing are
described in accordance with manufacturer’s specifications.
Element 2
Describe the selection criteria, use, and manufacturer’s specifications of fittings for water
mains.
Performance criteria
2.1
Fittings are described in terms of their selection criteria for differing pipe types,
diameters, and pressure ratings.
Range
2.2
fittings – water main isolating valves, tees, bends, fire hydrants;
valves include but are not limited to – special purpose valve, air
valve, tappings.
Fittings are described in terms of their use and manufacturer’s specifications.
Range
fittings – water main isolating valves, tees, fire hydrants;
valves include but are not limited to – special purpose valve, air
valve, tappings;
specifications include but are not limited to – materials of
construction, type and class, pressure rating, installation, reduction
gearing, anchor block requirements.
 New Zealand Qualifications Authority 2016
19211 version 3
Page 3 of 3
Element 3
Describe causes of failure, and methods of prevention of failure, of water supply pipes.
Performance criteria
3.1
The causes of water supply pipe failure are described.
Range
3.2
external factors include but are not limited to – ground conditions,
external loading, environmental (slips, earthquake), accidental
damage, defective installation, degradation of materials;
internal factors include but are not limited to – water quality, water
pressure, water hammer (shock loading), air in the system;
water supply pipe factors include but are not limited to – material,
type, condition.
Methods of prevention of failure of water supply pipes are described for external
factors, internal factors, and water supply pipe factors.
Range
includes but is not limited to – workmanship, corrosion prevention,
material selection, compatibility of materials, loading.
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 Primary Industry Training Organisation standards@primaryito.ac.nz if
you wish to suggest changes to the content of this unit standard.
 New Zealand Qualifications Authority 2016