NZQA Expiring unit standard
17607 version 6
Page 1 of 5
Title
Operate geothermal steamfield equipment and processes
Level
2
Credits
9
Purpose
People credited with this unit standard are able to: demonstrate
knowledge of geothermal energy and reservoirs, geothermal
steam, and steamfield equipment; and operate geothermal
steamfield equipment and processes.
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
Performance of the elements of this unit standard must comply with the following
enactments: Health and Safety in Employment Act 1992; Resource Management Act
1991; and Hazardous Substances and New Organisms Act 1996.
3
The Environmental Risk Management Authority (ERMA) is responsible for assessing
and approving hazardous substances and, where appropriate, setting controls on the
way the substance is used. Any questions relating to the provisions for hazardous
substances should be directed to ERMA New Zealand, telephone 04 916 2426; or
EXITO, telephone 03 964 4710.
This unit standard is
expiring
New Zealand Industry Training Organisation
SSB Code 101541
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
17607 version 6
Page 2 of 5
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of geothermal energy and reservoirs.
Evidence requirements
1.1
Geothermal reservoirs are described in terms of geological, geophysical, and
hydrodynamic concepts.
Range
1.2
Geothermal fluids are described in terms of typical chemical composition.
Range
1.3
energy, well output in respect to: pressure, ratio of steam and
water, depth, pressure, temperature, flow, phases.
Potential problems of geothermal wells are described in terms of their cause
and the effect on energy output.
Range
1.5
water, dissolved gases, dissolved solids, suspended solids, heavy
metals, chemical treatment.
The extraction of energy from geothermal wells is described in terms of output.
Range
1.4
feed zone, cold inflow, permeability, resistivity, reinjection return.
subsidence, cold water infiltration, deposition formation, rock
permeability.
Reinjection is described in terms of purpose and effect on reservoir.
location,
depth, temperature,
injectivity.
This
unit
standard
is
Outcome 2
expiring
Demonstrate knowledge of geothermal steam.
Range
Evidence requirements
2.1
Physical concepts of steam are described in relation to geothermal reservoir
production.
Range
2.2
temperature, phases, pressure, energy content, specific heat
capacity, superheat.
Heat transfer theory is described in terms of physical concepts.
Range
conduction, convection, radiation, sensible heat, latent heat.
New Zealand Industry Training Organisation
SSB Code 101541
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
2.3
17607 version 6
Page 3 of 5
The effects of heat and pressure on water are described in relation to steam
production.
Range
saturation pressure and temperature, sensible enthalpy, enthalpy
of evaporation, total enthalpy.
Outcome 3
Demonstrate knowledge of steamfield equipment.
Evidence requirements
3.1
Steamfield pipework and fittings are described in terms of operating and design
concepts.
Range
3.2
Steamfield separation equipment is described in terms of operating and design
concepts.
Range
3.3
separators, water vessels, silencers.
Steamfield wellhead equipment is described in terms of operating and design
concepts.
Range
3.4
pipework, lagging, drains, steam traps, expansion protection valve
isolation, flow, pressure relief, control.
safety valve, bursting disc, check valve, orifice plate, isolation
valve, cellar, casing, support structure, down hole measurements.
Steamfield indication, control, and protection equipment is described in terms of
operating and design concepts.
level indication, level alarm, level control, flow control, pressure
This
control.unit standard is
expiring
Range
Outcome 4
Operate geothermal steamfield equipment and processes.
Evidence requirements
4.1
The operation of geothermal steamfield equipment and processes is initiated in
accordance with organisational requirements.
Range
start up, shut down, control.
4.2
Items of equipment to be operated are identified using the plant documentation.
4.3
The operating requirements are determined in relation to the upstream and
downstream effects of the operation.
New Zealand Industry Training Organisation
SSB Code 101541
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
4.4
17607 version 6
Page 4 of 5
Current status of the equipment and process is determined in accordance with
organisational requirements.
Range
operating, standby, isolated.
4.5
Geothermal steamfield equipment systems are operated in accordance with
organisational requirements and health and safety requirements.
4.6
Control systems are identified and their operation explained in terms of their
effect on the system.
Range
4.7
temperature, chemical injection.
Preventative maintenance and routine procedures are carried out in accordance
with organisational requirements.
Range
monitoring, log keeping, lubrication, greasing, sampling.
Replacement information
This unit standard has been replaced by unit standard
28159 and unit standard 28160.
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
25 November 2000
31 December 2014
2
24 July 2002
31 December 2014
Review
5
22 May 2009
31 December 2016
Review
6
24 October 2014
31 December 2016
Revision
Review
Rollover and
Revision
This
unit standard
is
3
27 June 2005
31 December 2014
31 December 2014
4
25 July
2006
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.
New Zealand Industry Training Organisation
SSB Code 101541
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
17607 version 6
Page 5 of 5
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.
This unit standard is
expiring
New Zealand Industry Training Organisation
SSB Code 101541
 New Zealand Qualifications Authority 2016