4427 version 2
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DIVING - OCCUPATIONAL
Complete dive operations using a bell
and/or chamber complex
level:
6
credit:
6
planned review date:
June 2002
sub-field:
Diving
purpose:
People credited with this unit standard are able to dive
deeper than 50 metres using a bell, prepare and maintain
bell and/or chamber complex, monitor chamber operations
and act as a member of a surface team, describe and
monitor gas system quality, and operate Built In Breathing
Systems (BIBS).
entry information:
Prerequisites: Unit 6401, Provide first aid and Unit 6402,
Provide resuscitation level 2, or demonstrate equivalent
skills and knowledge; and hold a current Medical Clearance
to dive and occupational-specific certificate of competence.
accreditation option:
Evaluation of documentation and visit by NZQA and
industry.
moderation option:
A centrally established and directed national moderation
system has been set up by the Dive Industry Training
Organisation.
 New Zealand Qualifications Authority 2016
4427 version 2
28-Jun-16
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DIVING - OCCUPATIONAL
Complete dive operations using a bell
and/or chamber complex
special notes:
Industry criteria refer to diving practice complying with the
requirements of the Health and Safety in Employment Act
1992 and subsequent regulations relating to Occupational
Diving; and comply with the theory and practice
requirements of the British Health and Safety Executive
(HSE) 1990 to ensure the international standard is
maintained.
All practice also complies with Accident
Rehabilitation & Compensation Insurance Corporation and
Occupational Safety and Health (OSH) guidelines.
Elements and Performance Criteria
element 1
Dive deeper than 50 metres using a bell.
performance criteria
1.1
Internal pre-dive bell checks are carried out to industry criteria.
Range:
chamber cleanliness, door seal damage, equipment inventories,
chamber and control panel valves, BIBS oxygen supply, door
seals and equalising valves, mask installation, primary and
secondary gas or air supplies and operation, oxygen dump
system, back pressure regulators, lights, primary and secondary
communications equipment, diver’s seat harness, emergency
man lift, electrical wiring, valve alignment, drop weight release
mechanism, view ports.
 New Zealand Qualifications Authority 2016
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DIVING - OCCUPATIONAL
Complete dive operations using a bell
and/or chamber complex
1.2
External pre-dive bell checks are carried out to industry criteria.
Range:
1.3
door seals, lights, drop weight release mechanism, door
equalising valves, on board gas supply, view ports, main lift wire
attachment, guide wires, bell location transducer, strobe light,
electrical wiring and gas pipe inspection, valve setting.
Use of artificial gas mixtures and bell when diving deeper than 50 metres
meets industry criteria.
element 2
Prepare and maintain a bell and/or chamber complex.
performance criteria
2.1
Chamber complex is prepared to industry technical and safety criteria.
Range:
2.2
chamber cleanliness, door seal damage, equipment inventories,
sanitary system, chamber and control panel valves, BIBS oxygen
supply, mask installation, primary and secondary gas or air
supplies and operation, oxygen dump system, back pressure
regulators, lights, primary and secondary communications
equipment.
Post-dive bell and/or chamber complex procedures are completed to industry
technical and safety criteria.
Range:
cleanliness, inventory checks, damage or deterioration checks
and repairs, reporting of major problems.
 New Zealand Qualifications Authority 2016
4427 version 2
28-Jun-16
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DIVING - OCCUPATIONAL
Complete dive operations using a bell
and/or chamber complex
2.3
Bell and/or chamber complex is maintained to industry criteria and
manufacturer’s specifications.
Range:
maintenance checklist, gas fittings, fitting lubrication, door or bell
and mating or medical lock seals, BIBS masks, cleaning
procedures, calibration of gas analysis monitors.
element 3
Monitor chamber operations and act as a member of a surface team.
performance criteria
3.1
Readings are monitored in the chamber environment and reported to the
supervisor.
Range:
depth, temperature, humidity, oxygen and carbon dioxide levels.
3.2
Abnormal readings of previously determined limits are reported immediately.
3.3
Bell is locked and/or unlocked onto the chamber.
3.4
Umbilical handling meets industry criteria.
3.5
Materials are locked in and out of the chamber during saturation using the
medical lock according to industry criteria.
3.6
Diving operations log is maintained according to industry criteria ready for
supervisor’s signature for bounce and/or saturation dives.
 New Zealand Qualifications Authority 2016
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DIVING - OCCUPATIONAL
Complete dive operations using a bell
and/or chamber complex
element 4
Describe and monitor gas system quality.
Range:
industry criteria.
performance criteria
4.1
The effects of high pressure oxygen are explained in relation to combustible
materials.
4.2
Description of oxygen systems identifies that no oils or greases should be
present.
4.3
Description of oxygen piping systems includes procedures to avoid accidental
contamination.
4.4
The effects of gas impurities are described.
Range:
diver’s breathing gas, chamber and bell atmospheres.
4.5
Description of gas system contamination identifies possible points of
contamination.
4.6
Colour coding and markings are used to identify gases and the gas percentage
in mixed gases.
4.7
Continuous read-out gas analyser use monitors carbon dioxide levels.
4.8
Colourmetric tubes are used to identify impurities in gases.
 New Zealand Qualifications Authority 2016
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DIVING - OCCUPATIONAL
Complete dive operations using a bell
and/or chamber complex
element 5
Operate Built in Breathing Systems (BIBS).
performance criteria
5.1
Gas is put on line on supervisor’s instruction and meets industry criteria.
5.2
Gas supply from the control panel is opened to industry criteria.
5.3
Overboard dump system is made operational.
5.4
Back-pressure is set to industry technical and safety criteria.
Comments to:
Dive Industry Training Organisation
Unit Standard Revision
PO Box 160
WELLINGTON
by June 2002.
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: 0180]
 New Zealand Qualifications Authority 2016