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Operate heat recovery steam generator (HRSG) in a thermal power
station
Level
4
Credits
12
Purpose
People credited with this unit standard are able to: demonstrate knowledge of
HRSG systems and controls; operate and monitor HRSGs and systems; and
identify and respond to deviations during routine operation of an HRSG.
Subfield
Electricity Supply
Domain
Electricity Supply - Thermal Operations and Control
Status
Registered
Status date
20 June 2006
Date version published
20 June 2006
Planned review date
31 December 2011
Entry information
Open.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
Electricity Supply Industry Training Organisation
Accreditation and Moderation Action Plan (AMAP) reference
0120
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
This unit standard is intended for, but not restricted to, workplace assessment. The
range statements across the unit standard can be applied according to industry
specific equipment, procedures, and processes.
2
Safety of personnel and plant must be a priority throughout the assessment. If the
safety requirements are not met the assessment must stop and the candidate will be
assessed as not yet competent.
 New Zealand Qualifications Authority 2016
22879 version 1
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3
Performance and work practices in relation to the elements and performance criteria
must comply with all current legislation, especially the Electricity Act 1992, and any
regulations and codes of practice recognised under that statute; the Health and
Safety in Employment Act 1992; and the Resource Management Act 1991.
Electricity supply industry codes of practice and documented industry procedures
include the Safety Manual – Electricity Industry (SM-EI) (2004) Wellington: Electricity
Engineers’ Association. A full list of current legislation and industry codes is
available from the Electricity Supply Industry Training Organisation, PO Box 1245,
Hamilton.
4
‘Industry requirements’ include all industry and workplace documented policies,
procedures, specifications, business, and quality management requirements relevant
to the workplace in which assessment is carried out.
5
Practical exercises should be used for assessment wherever possible, with the
exception of element 2 which requires operational experience.
Elements and performance criteria
Element 1
Demonstrate knowledge of HRSG systems and controls.
Performance criteria
1.1
Steam generation principles and basic thermodynamics are explained in
accordance with industry requirements.
Range
1.2
HRSG systems and controls are described in terms of purpose and design.
Range
1.3
includes but is not limited to – heat transfer, saturated steam,
superheated steam, expansion, thermal stress.
may include but is not limited to – economisers, feed water
regulating valves, drums, steam water circuits, superheaters,
reheaters, de-superheaters, safety valves, level indication,
instrumentation, main stops, feed check valves, drain valves, vent
valves, supplementary firing.
HRSG normal operating parameters are identified and described in accordance
with industry requirements.
Element 2
Operate and monitor HRSGs and systems.
Performance criteria
2.1
Current status of system is identified in accordance with industry requirements.
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2.2
Correct items of plant are identified and located using plant identification and
numbering system.
Range
may include but is not limited to – feed water regulating valves,
drums, safety valves, level indication, instrumentation, main stops,
feed check valves, drain valves (manual and motorised), vent
valves (manual and motorised), pipe hangers, supplementary
firing.
2.3
Operating and monitoring actions are logged in accordance with industry
requirements.
2.4
Operating decisions are determined in accordance with plant status and
industry requirements.
Range
includes but is not limited to – plant availability and in service
condition, downstream and upstream effects on process.
2.5
Routine water chemistry monitoring, testing, and controlling is carried out in
accordance with industry requirements.
2.6
Control systems and functions of automated controllers are identified and
operated in accordance with industry requirements.
Range
2.7
Protection systems and automated actions are identified and activated in
accordance with industry requirements.
Range
2.8
includes but is not limited to – drum level/flow, steam
temperatures, steam pressures.
Plant start-up and shut-down procedures are activated and manual operations
performed in accordance with industry requirements.
Range
2.9
may include but is not limited to – drum level/flow controllers, desuperheater controllers, vents and drains controllers, blowdown
controllers, chemical dosing controllers, supplementary firing
controllers, diverter valve.
includes but is not limited to – heat recovery steam generator air
purge, drum levels, steam and water vents, steam and water
drains, dosing systems, heat recovery steam generator lay
up/storage.
HRSG regulatory testing is performed in accordance with industry requirements.
Range
may include but is not limited to – hydraulic testing, safety valve
testing, drum level trip testing, steam temperature/flow trip testing.
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Element 3
Identify and respond to deviations during routine operation of an HRSG.
Performance criteria
3.1
Deviations from normal operating conditions are identified, logged, reported,
and acted upon in accordance with industry requirements.
Range
3.2
includes but is not limited to – steam pressure, steam temperature,
drum levels, water and steam chemistry, leaks, passing valves.
Plant safety, fire, and emergency procedures are followed in accordance with
industry requirements.
Please note
Providers must be accredited by the Qualifications Authority, 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 the Qualifications Authority 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 Electricity Supply Industry Training Organisation info@attto.org.nz if
you wish to suggest changes to the content of this unit standard.
 New Zealand Qualifications Authority 2016