NZQA Expiring unit standard
4559 version 7
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Title
Operate common valves on energy and chemical plant
Level
2
Credits
3
Purpose
People credited with this unit standard are able to: demonstrate
knowledge of the common types of valves encountered in the
energy and chemical industry; operate valves; and monitor
valves, at an energy and chemical plant.
Classification
Energy and Chemical Plant > Operation of Energy and
Chemical Plant
Available grade
Achieved
Explanatory notes
1
Definitions
Organisational requirements refer to documented policies and to documented or
other directions provided to staff. These may include but are not limited to:
manufacturers’ procedures, plant procedures, suppliers’ instructions, site signage,
legislative requirements, codes of practice, company health and safety plans, on site
briefings, and supervisor’s instructions.
Plant refers to the plant or unit at which the person is employed.
2
All work practices and industry standards must comply with the following regulations
and legislation: Health and Safety in Employment Act 1992; Resource Management
Act 1991; and Hazardous Substances and New Organisms Act 1996.
3
This unit standard is
This unit standard is for occupations such as boiler operators and petrochemical
process operators whose role expiring
can include all or some of the following: steam
generation, water treatment, hydrocarbon processing and electrical generation in
industries including petrochemical, power generation, dairy processing, meat
processing, timber processing and other steam users.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of the common types of valves encountered in the energy and
chemical industry.
Evidence requirements
1.1
Valve types used in the energy and chemical industry are identified.
New Zealand Industry Training Organisation
SSB Code 101541
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
Range
1.2
minimum of 8 types are required.
Design, operating concepts, and key features of each type of valve identified in
evidence requirement 1.1 are described in terms of their components.
Range
1.3
4559 version 7
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components may include but are not limited to – body, flanges,
stem, bonnet, stuffing box, gaskets, hand wheel, actuator.
Purpose of control valves, isolation valves, and relief valves is explained using a
plant example.
Outcome 2
Operate valves at an energy and chemical plant.
Evidence requirements
2.1
The need to operate a valve is determined in terms of operational requirements.
Range
control, isolate, de-isolate, relieve.
2.2
The valve to be operated is identified using the plant identification and
numbering system.
2.3
Current valve position is identified to determine operating status.
Range
open, closed, modulating.
2.4
Upstream and downstream effects on the process of the valve operation are
assessed to determine method of operation.
2.5
Valve is operated safely in accordance with organisational requirements.
2.6
Actions are reported and logged in accordance with organisational
requirements.
2.7
This unit standard is
expiring
Potential problems of incorrect valve operation are described in terms that
explain the operational steps and techniques required to avoid them.
Range
fluid hammer, icing, cavitation hydraulic wedging, wire drawing.
2.8
Plant car seal and valve security lock procedures are explained in terms of
purpose and application.
2.9
Preventative maintenance and routine procedures are carried out in accordance
with organisational requirements.
Range
greasing, easing, monitoring.
Outcome 3
Monitor valves at an energy and chemical plant.
New Zealand Industry Training Organisation
SSB Code 101541
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
4559 version 7
Page 3 of 4
Evidence requirements
3.1
Gland and packing leaks are identified and reported in accordance with
organisational requirements.
3.2
Passing isolation valves are identified and reported in accordance with
organisational requirements.
3.3
Isolation requirements are identified and checked in accordance with
organisational requirements.
3.4
Bypass valves are commissioned in accordance with organisational
requirements to cause minimal disruption to the plant operations.
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
8 November 1995
31 December 2014
Revision
2
15 December 1998
31 December 2014
Review
3
29 May 2000
31 December 2014
Revision
4
24 July 2002
31 December 2014
Review
5
28 February 2006
31 December 2014
Review
6
22 May 2009
31 December 2016
Review
7
24 October 2014
31 December 2016
This unit standard is
expiring
Consent and Moderation Requirements (CMR) reference
0079
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.
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.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR also includes useful information about special requirements for organisations wishing
New Zealand Industry Training Organisation
SSB Code 101541
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
4559 version 7
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to develop education and training programmes, such as minimum qualifications for tutors
and assessors, and special resource requirements.
This unit standard is
expiring
New Zealand Industry Training Organisation
SSB Code 101541
 New Zealand Qualifications Authority 2016