NZQA Expiring unit standard
21173 version 3
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Title
Demonstrate knowledge of and hot dip galvanize and centrifuge
small metal components
Level
3
Credits
13
Purpose
People credited with this unit standard are able to: demonstrate
knowledge of zinc coating and centrifuging at a hot dip
galvanizing facility; identify, evaluate, control, and monitor
health and safety hazards and environmental aspects of
galvanizing and centrifuging operations; and apply zinc coating
to small metal components using hot dip galvanizing process
and centrifuge them at a hot dip galvanizing facility.
Classification
Hot Dip Galvanizing > Hot Dip Galvanizing Operations
Available grade
Achieved
Entry information
Critical health and
safety prerequisites
Prerequisites: Unit 3800, Operate a radio remote or pendant
controlled overhead crane and lift and place regular loads; Unit
25130, Describe hazards, safety and emergency procedures,
and exhibit safe working practices at a hot dip galvanizing
facility; and Unit 25133, Demonstrate knowledge of venting and
draining for hot dip galvanizing; or demonstrate equivalent
knowledge and skills.
This unit standard is
Explanatory notes
expiring
1
The current version of the following documents must be complied with:
Health and Safety in Employment Act 1992;
Health and Safety in Employment Regulations 1995;
AS/NZS 4680:2006 Hot-dip galvanized (zinc) coatings on fabricated ferrous articles,
available at http://www.standards.co.nz;
After-Fabrication Hot Dip Galvanizing: A practical reference for designers, specifiers,
engineers, consultants, manufacturers, and users, Galvanizing Association of New
Zealand, telephone 09 589 5400, fax 09 579 8907, website
http://www.galvanizing.org.nz.
2
It is recommended that assessment against this unit standard follows or is concurrent
with assessment against Unit 21168, Demonstrate knowledge of the pickling process
and pickle metal components at a hot dip galvanizing facility; and Unit 21170,
Demonstrate knowledge of the fluxing process and flux metal components at a hot
dip galvanizing facility.
NZ Motor Industry Training Organisation
(Incorporated) (MITO)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
3
21173 version 3
Page 2 of 5
Definitions
Company procedures refer to all documented policies and procedures of the
candidate’s employer at the time of training including, but not limited to, those relating
to health, safety, environment, quality, and operations;
Immersion refers to the process of dipping components in molten zinc until the
temperature of the inner core of the components matches that of the molten zinc;
Small metal components refer to fasteners such as nails, nuts, bolts, and screws.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of zinc coating and centrifuging at a hot dip galvanizing facility.
Evidence requirements
1.1
Purpose of hot dip galvanizing is described in accordance with After-Fabrication
Hot Dip Galvanizing.
1.2
Hot dip galvanizing is described in terms of materials used at a specific hot dip
galvanizing facility.
Range
must include – zinc, aluminium;
may include – lead.
1.3
Working temperature range is identified and described in accordance with AfterFabrication Hot Dip Galvanizing.
1.4
Immersion times are described in accordance with After-Fabrication Hot Dip
Galvanizing.
1.5
Methods of preparation and checking of small metal components are described
in terms of pre-hot dip galvanizing requirements.
1.6
Production of fumes, ash, and dross are described in terms of their causes.
1.7
The means of control of fumes resulting from the production of ash and dross
are described in terms their function and company procedures.
This unit standard is
Range
requirements
may include but are not limited to – wiring, rumbling,
expiring
turning for adequate pickling.
Range
1.8
control includes but is not limited to – extraction system, cleaning
kettle surface, basket cleanliness.
Dipping and withdrawal rates are described in accordance with company
procedures.
NZ Motor Industry Training Organisation
(Incorporated) (MITO)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
1.9
Tools and equipment used for the hot dip galvanizing of small metal
components are identified and their functions are described in accordance with
company procedures.
Range
1.10
21173 version 3
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may include but is not limited to – baskets, centrifuge, lifting gear,
table, quench, tray, rumbler.
Centrifuging methods are described and detailed in accordance with company
procedures.
Range
at least two types of small metal components;
details include but are not limited to – quantity in basket,
immersion time, stirring of articles in zinc, transferring of articles,
draining baskets, time in centrifuge, quenching, tipping table,
transfer to container; and may include rumbling.
Outcome 2
Identify, evaluate, control, and monitor health and safety hazards of galvanizing and
centrifuging operations.
Evidence requirements
2.1
Health and safety hazards are identified, evaluated, controlled, and monitored in
accordance with legislative requirements and company procedures.
Range
2.2
includes but is not limited to – noise, burns, respiration, heat,
repetitive physical tasks, splashing, explosion, lifting, transferring
between kettle and centrifuge, steam, flying articles, isolation of
centrifuge during cleaning, obstructions, people in the vicinity,
personal injury, spills, stress.
This unit standard is
Range
factors – humid
atmosphere, clothing, equipment, physical
expiring
exertion;
Methods of avoiding dehydration are described in terms of work factors to be
considered and ways of controlling their effect.
controls – type of fluid, timing of fluid intake (before physical
activity, during physical activity, after physical activity), personal
protective equipment.
2.3
The observable symptoms of dehydration are identified and described.
Range
2.4
evidence is required for at least three symptoms.
Rehydration is described in terms of frequency of intake and the effect of
substances on fluid replacement.
Range
substances – water, fruit juice, soft drinks, sport drinks, salt,
alcohol, caffeine.
NZ Motor Industry Training Organisation
(Incorporated) (MITO)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
2.5
Environmental aspects are identified and evaluated in accordance with
legislative requirements and company procedures.
Range
2.6
21173 version 3
Page 4 of 5
aspects include but are not limited to – noise, emissions,
hazardous materials, kettle fumes.
Environmental aspects are controlled and monitored in accordance with
legislative requirements and company procedures.
Range
aspects include but are not limited to – noise, emissions,
hazardous materials.
Outcome 3
Apply zinc coating to small metal components using hot dip galvanizing process at a hot
dip galvanizing facility.
Range
evidence is required of galvanizing threaded and non-threaded components.
Evidence requirements
3.1
Components are prepared in accordance with client requirements and are
transferred to basket with no spillage.
3.2
Kettle surface is swept and ash removed in accordance with company
procedures.
Range
prior to immersion, prior to withdrawal.
3.3
Baskets are lifted and moved to hot dip galvanizing kettle in accordance with
company procedures, and are lowered into kettle without splashing.
3.4
Components are immersed and stirred, and basket is removed from kettle, in
accordance with company procedures.
3.5
This unit standard is
The basket is drained and
transferred to centrifuge in accordance with company
expiring
procedures.
Outcome 4
Centrifuge small metal components at a hot dip galvanizing facility.
Range
threaded, non-threaded, hollow section, castings, chain.
Evidence requirements
4.1
The purpose of centrifuging is described in accordance with After-Fabrication
Hot Dip Galvanizing.
NZ Motor Industry Training Organisation
(Incorporated) (MITO)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
4.2
Small metal components are centrifuged in accordance with company
procedures.
Range
4.3
21173 version 3
Page 5 of 5
time, speed, load capacity, personnel.
Centrifuged components have a smooth, uniform, continuous coating and,
where relevant, clean threads.
This unit standard is expiring. Assessment against the standard must take place by
the last date for assessment set out below.
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
21 October 2004
31 December 2016
Review
2
23 January 2009
31 December 2016
Review
3
16 April 2015
31 December 2016
Consent and Moderation Requirements (CMR) reference
0114
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
This unit standard is
Requirements for consent to assessexpiring
and an outline of the moderation system that applies
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR 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.
NZ Motor Industry Training Organisation
(Incorporated) (MITO)
SSB Code 101542
 New Zealand Qualifications Authority 2016