NZQA registered unit standard
28158 version 1
Page 1 of 4
Title
Operate control systems in an energy and chemical plant
Level
4
Purpose
Credits
15
This unit standard is for people working as boiler and energy
and chemical process operators.
People credited with this unit standard are able to: explain the
control systems used; utilise control systems; and explain the
use of data from control systems, in an energy and chemical
plant.
Classification
Energy and Chemical Plant > Monitoring of Energy and
Chemical Plant
Available grade
Achieved
Explanatory notes
1
Assessment conditions
All assessment must be carried out at an energy or chemical site.
2
Definitions
Energy and chemical plant may be in – petrochemical, agri-nutrient, power
generation, dairy processing, meat processing, and wood fibre manufacturing, or
other plants that operate with a combination of high temperatures, pressures, steam
and/or chemicals in gas, liquid or solid form.
Organisational requirements – documented policies and procedures. These may
include: equipment manufacturers’ procedures, plant procedures, suppliers’
instructions, site signage, codes of practice, company health and safety plans, on site
briefings, and supervisor’s instructions. This includes all regulatory and legislative
obligations that apply to the plant.
Plant – the operational unit, equipment and/or workplace at which the person is
working.
3
Legislation relevant to this unit standard includes but is not limited to – Hazardous
Substances and New Organisms Act 1996, Health and Safety in Employment Act
1992, Resource Management Act 1991.
Outcomes and evidence requirements
Outcome 1
Explain the control systems used in an energy and chemical plant.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28158 version 1
Page 2 of 4
Evidence requirements
1.1
Control systems are explained in terms of basic concepts.
Range
1.2
Control hardware components are explained in terms of function and operating
concepts.
Range
1.3
alarm systems include but are not limited to – process, shutdown,
deviation.
Managing alarm changes at the plant is explained in terms of the process.
Range
1.7
control signal media include but are not limited to – pneumatic,
hydraulic, electrical.
Alarm systems are explained in terms of their purpose.
Range
1.6
terms include but are not limited to – modulating, discrete, closedloop, open-loop, cascade, split range, proportional, integral,
derivative, logic control, automatic, manual.
Control signal media are explained in terms of their types.
Range
1.5
components include but are not limited to – transmitters, signal
converters, controllers, actuators, positioners, relays, transducers,
limit switches.
Terms used in control systems are explained in terms of their use.
Range
1.4
control systems include but are not limited to – programmable
logic computer, distributed controller.
changes include but are not limited to – activation point changes,
disabling alarm, enabling alarm, bypass activation.
The plant hierarchy of alarms systems is explained in terms of organisational
requirements.
Outcome 2
Utilise control systems in an energy and chemical plant.
Evidence requirements
2.1
Plant control system is described in terms of its configuration.
Range
.
2.2
configuration includes but is not limited to – operating system,
digital inputs and outputs.
Navigation around screens is carried out in accordance with organisational
requirements.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
2.3
28158 version 1
Page 3 of 4
Operating system is used to carry out functional operations in accordance with
organisational requirements.
functional operations include but are not limited to – printing,
navigation, screen/window management.
Range
2.4
Plant current status is verified in accordance with organisational requirements.
2.5
Plant sequences are monitored in accordance with organisational requirements.
2.6
Alarm screens are used to interpret alarm types and take action in accordance
with organisational requirements.
Outcome 3
Explain the use of data from control systems in an energy and chemical plant.
Evidence requirements
3.1
Steps taken in a process investigation are explained in terms of organisational
requirements.
data includes but is not limited to – trends, reports, logs.
Range
Replacement information
This unit standard replaced unit standard 21453.
Planned review date
31 December 2019
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
24 October 2014
N/A
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.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28158 version 1
Page 4 of 4
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
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.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016