19213 version 2
Page 1 of 3
Demonstrate knowledge of blockage clearance and wastewater
maintenance
Level
2
Credits
3
Purpose
People credited with this unit standard are able to describe: the causes of
blockages within wastewater collection systems; and the equipment and
techniques available for clearing blockages, and preventive maintenance.
This unit standard is for people who work in wastewater reticulation systems.
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
Definition
Wastewater includes stormwater and sewage systems.
 New Zealand Qualifications Authority 2016
19213 version 2
Page 2 of 3
Elements and performance criteria
Element 1
Describe the causes of blockages within wastewater collection systems.
Performance criteria
1.1
Blockages due to wedging of objects are described in terms of the types of
objects and where blockages are likely to form.
Range
1.2
Blockages due to pipework defects are described in terms of the initial
construction and subsequent connections or pipe displacements.
Range
1.3
jointing, workmanship, fittings, service connections, ‘jagged
edges’, pipe displacement due to tree roots and ground
movement, growth of blocked material, flat grade, surface loading.
Blockages due to plant root intrusion are described in terms of the entry points,
impacts on pipeline profile, and corrective actions.
Range
1.4
includes but is not limited to – sticks, small animals, metal objects
(cutlery, cans), nappies, vegetation.
joint or collar entry, joint types, water requirements of plants, pipe
failure.
Blockages due to domestic and industrial fats are described in terms of the
corrective actions.
Element 2
Describe the equipment and techniques available for clearing blockages, and preventive
maintenance.
Performance criteria
2.1
The use of rodding equipment is described in relation to its use in sewer
maintenance and blockage clearance.
Range
2.2
equipment – screw-together rod sections, proprietary types;
end fittings – screw, hook, plunger, continuous metal ribbon.
The use of jetting equipment and nozzle types is described in relation to its use
in sewer maintenance and blockage clearance.
 New Zealand Qualifications Authority 2016
19213 version 2
Page 3 of 3
2.3
The use of drawn equipment is described in relation to its use in sewer
maintenance.
Range
equipment includes but is not limited to – winch and set-up
arrangements, plungers, pigs;
considerations for use – tension control, safety from tension
releases, anchoring, attachment selection.
2.4
Blockage excavation, repair, and removal are described in terms of the
processes.
2.5
Blockage detection is described in terms of the use of closed circuit television
(CCTV).
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