15072
28-Jun-16
1 of 5
MARITIME ENGINEERING
Maintain refrigeration equipment on
board a vessel
level:
4
credit:
6
planned review date:
July 2000
sub-field:
Maritime
purpose:
People credited with this unit standard are able to
demonstrate knowledge of environmental considerations and
maintain refrigeration equipment.
entry information:
Open.
accreditation option:
Evaluation of documentation and visit by NZQA and industry.
moderation option:
A centrally established and directed moderation system has
been established by Maritime Qualifications New Zealand
(Inc).
special notes:
This unit standard is a general maintenance engineering
standard designed for people working on or intending to
work on board a commercial vessel.
1
All work practices must meet recognised codes of
practice and documented vessel safe ships
management procedures for personal, product and
vessel safety, and obligations required under current
legislation. Legislation relevant to this unit standard
includes, but is not limited to, the Ozone Layer
Protection Act 1996, Maritime Transport Act 1994,
Health and Safety in Employment Act 1992, and their
subsequent amendments.
 New Zealand Qualifications Authority 2016
15072
28-Jun-16
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MARITIME ENGINEERING
Maintain refrigeration equipment on
board a vessel
2
Refrigeration systems include but are not limited to:
a
brine (secondary refrigerant)
b
direct expansion
c
ice making machines
d
blast freezers
e
mechanical absorption
f
vapour compression.
3
Refrigeration types include but are not limited to:
a
grid
b
plate
c
brine tanks
d
spray brine/salt water/ice
e
air cooler batteries.
Elements and Performance Criteria
element 1
Demonstrate knowledge of environmental considerations when maintaining refrigeration
equipment.
performance criteria
1.1
The purpose of the Ozone Layer Protection Act is explained.
1.2
The reasons for protecting the ozone layer from modifications are explained.
Range:
adverse effects on human health and the environment.
 New Zealand Qualifications Authority 2016
15072
28-Jun-16
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MARITIME ENGINEERING
Maintain refrigeration equipment on
board a vessel
1.3
The consequences of the greenhouse effect on the environment are described.
Range:
1.4
Restrictions on the use of controlled substances contained in the Ozone Layer
Protection Act are explained.
Range:
1.5
effect of gases in the atmosphere, global warming, greenhouse
effect.
reduction timetable for consumption in the refrigeration and air
conditioning industry, importation of controlled substances,
manufacturing of controlled substances, sale, codes of practice,
offences, penalties.
Refrigerants are handled, stored and mixed in accordance with the vessel’s
operating procedures and manufacturer’s guidelines.
Range:
refrigerants may include but are not limited to - calcium chloride
mixture to chart reading dependent on temperature;
safety - corrosive, toxic, fluorocarbons, ammonia.
element 2
Maintain refrigeration equipment.
performance criteria
2.1
Maintenance schedules are prepared in accordance with the vessels operating
procedures.
2.2
Safety precautions for maintaining refrigeration equipment are explained.
Range:
precautions may include but are not limited to - detecting leaks,
recharging the system, recovery of refrigerant, testing electrical
components.
 New Zealand Qualifications Authority 2016
15072
28-Jun-16
4 of 5
MARITIME ENGINEERING
Maintain refrigeration equipment on
board a vessel
2.3
System balance of coolant and liquid refrigerant flow is maintained in
accordance with the manufacturers operating guidelines.
Range:
2.4
system balance - through maintenance of recommended liquid
temperature;
plate and grid systems.
System variables are identified and actions described to initiate and maintain
the designated performance of the system.
Range:
gas quantity, dissipating oil, leakage, liquid and saturation
temperature, system balance of coolant.
2.5
Heat transfer, and the effects of pressure on refrigerant are described in
accordance with the manufacturers operating guidelines.
2.6
Refrigerant and oil levels and flows are adjusted for required performance and
verified in accordance with the vessel and manufacturer’s operating guidelines.
2.7
Procedures for detecting leaks, repairing leaks and recharging the system with
refrigerants are demonstrated or explained in accordance with the
manufacturers operating guidelines.
2.8
Purging and charging procedures are demonstrated or explained in accordance
with the vessel and manufacturers operating guidelines.
 New Zealand Qualifications Authority 2016
15072
28-Jun-16
5 of 5
MARITIME ENGINEERING
Maintain refrigeration equipment on
board a vessel
Comments to:
Maritime Qualifications New Zealand (Inc)
Unit Standard Revision
PO Box 160
WELLINGTON
by July 2000.
Please Note:
Providers must be accredited by the Qualifications Authority
before they can offer programmes of education and training
assessed against unit standards.
Accredited providers assessing against unit standards must
engage with the moderation system that applies to those unit
standards. [Please refer to relevant Plan ref: 0054]
 New Zealand Qualifications Authority 2016