18416 version 2
Page 1 of 4
Operate and maintain gas-fired water bath heater equipment on a gas
transmission pipeline system
Level
3
Credits
4
Purpose
This unit standard is for people working, or intending to work, in the gas
transmission industry.
People credited with this unit standard are, on a transmission pipeline
system, able to: demonstrate knowledge of gas-fired bath heaters and their
operating procedures; prepare a gas-fired water bath heater for service; and
monitor and maintain gas-fired water bath heater systems.
Subfield
Gas Industry
Domain
Gas Transmission Operations
Status
Registered
Status date
22 May 2009
Date version published
22 May 2009
Planned review date
31 December 2014
Entry information
Open.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
NZ Motor Industry Training Organisation (Incorporated)
(MITO)
Accreditation and Moderation Action Plan (AMAP) reference
0114
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
Performance of the elements of this unit standard must comply with relevant site
requirements, and the following legislation and standard:
Health and Safety in Employment Act 1992;
Health and Safety in Employment (Pipelines) Regulations 1999;
Resource Management Act 1991;
NZS/AS 2885.1:1997 Pipelines – Gas and liquid petroleum – Design and
construction.
 New Zealand Qualifications Authority 2016
18416 version 2
Page 2 of 4
2
Definition
Company procedures refer to the documented methods for performing work activities
and include health and safety, environmental, site requirements, and quality
management requirements. They may refer to manuals, codes of practice, or policy
statements.
Elements and performance criteria
Element 1
Demonstrate knowledge of gas-fired bath heaters and their operating procedures on a
transmission pipeline system.
Performance criteria
1.1
A gas-fired water bath heater is described in terms of its purpose.
Range
1.2
may include but is not limited to – Joules Thompson effect
(temperature loss due to pressure reduction), maintaining gas
delivery temperature to customer.
A gas-fired water bath heater is described in terms of its component parts.
Range
may include but is not limited to – inlet and outlet isolation valves,
water bath heater unit, bypass valve, temperature and pressure
indicators/transmitters, heater temperature control system,
delivery temperature control system, trip systems, heater water,
inhibitor, heater status indication, lagging.
1.3
Procedures for operating a gas-fired water bath heater and ancillary equipment
are located and interpreted in terms of company procedures.
1.4
Potential hazards of a gas-fired water bath heater are identified, and site
emergency procedures are explained in accordance with company procedures.
Range
hazards may include but are not limited to – hazardous areas,
flammable product, high/low temperature, hydrates, sources of
ignition.
Element 2
Prepare a gas-fired water bath heater for service on a transmission pipeline system.
Performance criteria
2.1
Intended work activities are communicated to appropriate personnel prior to
commencing work.
Range
2.2
may include but is not limited to – control room, area technicians.
Tools and equipment required are located, and are explained in terms of their
use in accordance with manufacturer's instructions.
 New Zealand Qualifications Authority 2016
18416 version 2
Page 3 of 4
2.3
Pre-start checks are carried out in accordance with manufacturer's instructions
to determine the operational status of the water bath heater.
Range
2.4
may include but is not limited to – burner operation, pilot burner
operation, combustion air systems, power supplies, control valve
position, manufacturer’s specifications, gas regulation equipment,
gas pressure, water level, water inhibitor level, heater status
indication, trip system, flame failure shutdown system.
Water bath heater is lit in accordance with company procedures.
Element 3
Monitor and maintain gas-fired water bath heater systems on a transmission pipeline
system.
Performance criteria
3.1
Systems are monitored to assess performance and are tuned to achieve
optimum operation in accordance with company procedures and manufacturer's
instructions.
Range
3.2
may include but is not limited to – gas temperatures, pressures,
combustion, control system tuning and set points, flue gas
analysis, lagging condition, water analysis, calibration checks,
control valve adjustments.
Typical equipment faults are identified and methods of repair are explained in
accordance with company procedures and manufacturer's instructions.
Range
may include but is not limited to – burner failure, changes in fuel
pressure, low water level, low heat output, poor temperature
control, thermocouple failure, high temperature trip, fault in trip
system, inaccuracies in indication equipment, corrosion inside
heater, loss of utilities, pilot flame position, blocked filters, blocked
flues.
3.3
The heater is shut down in the event of a fault in accordance with company
procedures and manufacturer's instructions.
3.4
Components and component parts are repaired, replaced, fitted, and adjusted
in accordance with manufacturer’s instructions.
3.5
The consequences of incorrect operation of water bath heater equipment are
identified in accordance with manufacturer's instructions.
Range
may include but is not limited to – disruption to gas flow path, poor
temperature control, low delivery gas temperature to customer,
gas leaks from system, corrosion of heater components.
 New Zealand Qualifications Authority 2016
18416 version 2
Page 4 of 4
3.6
Documentation related to monitoring and maintaining the gas-fired water bath
heater system is completed and communicated to all appropriate personnel in
accordance with company procedures.
Please note
Providers must be accredited by NZQA, 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 NZQA 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 NZ Motor Industry Training Organisation (Incorporated) (MITO)
info@mito.org.nz if you wish to suggest changes to the content of this unit standard.
 New Zealand Qualifications Authority 2016