Unit of competency Outline

Date retreived
23/07/2026 9:21 PM AWST

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Dive using closed-circuit breathing apparatus (HeO2) in open water to a maximum depth of 60 metres

Dive using closed-circuit breathing apparatus (HeO2) in open water to a maximum depth of 60 metres

Unit of competency
National Code
DEFDV007B
State Code
AVV08
TGA Status
Replaced
DTWD Status
Replaced
Current Release Number
2.00
Current Release Date
24/01/2013
View on TGA
State Implementation and Classification
Approved Date
Field of Education
092101 - Sport And Recreation Activities
Original Release Date
Nominal Hours
0
Description
This unit covers the competency required to dive using closed-circuit breathing apparatus (CCBA) (HeO2) in an open water environment to a maximum depth of 60 metres.This unit specifically covers those aspects of performance unique to CCBA (HeO2), such as operating the HeO2 compressor/hand-booster pump, inspecting and operating CCBA (HeO2) equipment, and conducting CCBA (HeO2) specific contingency drills.This unit also includes the HeO2 standby diver responsibility of mid-water casualty handover.
Notes
Elements and Performance Criteria
1.Operate an HeO2 compressor/hand-booster pump
  • 1.1 Compressor and associated equipment are inspected for serviceability.
  • 1.2 Protective equipment is fitted.
  • 1.3 Leads and hoses are connected to the compressor.
  • 1.4 Gas cylinders are charged to maximum working.
  • 1.5 Operator level maintenance is performed on the compressor.
  • 1.6 Compressor is de-serviced after use.
2. Conduct dive operations
  • 2.1 CCBA (HeO2) is selected, inspected for serviceability, and fitted and tested (both out of water and in-water).
  • 2.2 Dives are conducted using CCBA (HeO2) and dive contingencies are demonstrated.
  • 2.3 Mid-water casualty handover is conducted between an HeO2 standby diver and an air standby diver.
  • 2.4 CCBA (HeO2) is de-serviced and defects are reported in accordance with organisational procedures.
The Range Statement relates to the Unit of Competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording in the Performance Criteria is detailed below.
Open water environment may include:
day or night
oceans, seas, lakes and rivers
subsurface conditions:
current (0-2 knots)
visibility (0 metre +)
temperature (0 degrees +)
surface and subsurface hazards such as:
anchor drop zones
cathodic protection devices
electrical cabling
inlets and sonar/radio frequency hazards
marine animals
piers and jetties
pipelines
pollutants
propellers/thrusters
trapping hazards:
beams
culverts
gates
grottoes and caves
intakes and outfalls
nets
safety, anchor and communications lines
sewers
submerged ships, vehicles and structures
sluices
vessel rocking and associated movement
Associated equipment may include:
hoses
pumps
Protective equipment may include:
gloves
goggles
CCBA (HeO2) may include:
counter-lung
emergency cylinder
facemask /mouthpiece
HeO2 cylinder
scrubber material
Operator level maintenance may include:
checking existing pressure in cylinders with pressure gauge
conducting charging in (HeO2) clean environment
following correct charging procedure and charging rate operating high pressure charging panels
Dive contingencies may include:
buddy breathing
companion diver
flooded mask
fouled supply
hose blockage/choking
hose rupture
partial pressure anomalies
set to 40 bar
trouble drill
Critical aspects for assessment and evidence required to demonstrate competency in this unit
Assessment must confirm the ability to:
arrange for others to check equipment
conduct in-water checks
handle non-functional equipment items
prepare equipment for the dive including charging of cylinders
maintain equipment during the dive
refurbish equipment post-dive
recover and clear mask and mouthpiece
safely enter and exit the water appropriate to the launch platform, equipment and conditions
switch from primary to the reserve air system
implement contingency and emergency drills such as:
ditching drills
buddy breathing
unconscious companion diver drills
HeO2/air standby diver mid-water casualty handover drill.
Consistency in performance
Competency will be demonstrated over a minimum of 4 dives with the diver diving to a depth not greater than 60 m using CCBA (HeO2) in open water that includes the following requirements:
oceans, seas, lakes and rivers
day and night
sub-surface conditions:
a range of surface and sub-surface hazards
current (0-2 knots)
temperature (0 degrees +)
visibility (0 metre +)
Table 1 (below) outlines the minimum dives required by this Unit of Competency.
Table 1
Condition
No of Dives
In-water time
Remarks
Between 060m
4
60 min
Total accrued sub-surface time (060m)

Context of and specific resources for assessment
Context of assessment
Competency will be assessed in the ocean over a range of oceanic, diurnal and nocturnal environments, supported by questioning on shore or aboard vessels.
When practicable, assessment should relate to the diver’s vocational focus.
Specific resources for assessment
Access to complete range of CCBA (HeO2) diving, safety and accessory equipment.
No information