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Evidence Guide: DEFDV005B - Dive using closed-circuit breathing apparatus (N2O2) in open water to a maximum depth of 40 metres

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

From the Wiki University

 

DEFDV005B - Dive using closed-circuit breathing apparatus (N2O2) in open water to a maximum depth of 40 metres

What evidence can you provide to prove your understanding of each of the following citeria?

Operate an N2O2 compressor/ hand-booster pump

  1. Compressor and associated equipment are inspected for serviceability.
  2. Protective equipment is fitted.
  3. Leads and hoses are connected to the compressor.
  4. Gas cylinders are charged to maximum working pressure and details are recorded in relevant logs.
  5. Operator level maintenance is performed on the compressor.
  6. Compressor is deserviced after use.
Compressor and associated equipment are inspected for serviceability.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Protective equipment is fitted.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Leads and hoses are connected to the compressor.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Gas cylinders are charged to maximum working pressure and details are recorded in relevant logs.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Operator level maintenance is performed on the compressor.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Compressor is deserviced after use.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Conduct dive operations

  1. CCBA (N2O2) is selected, inspected for serviceability, and fitted and tested (both out of water and inwater).
  2. Dives are conducted using CCBA (N2O2) and dive contingencies are demonstrated.
  3. CCBA (N2O2) is deserviced and defects are reported in accordance with organisational procedures.
CCBA (N2O2) is selected, inspected for serviceability, and fitted and tested (both out of water and inwater).

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Dives are conducted using CCBA (N2O2) and dive contingencies are demonstrated.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

CCBA (N2O2) is deserviced and defects are reported in accordance with organisational procedures.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Evidence Guide

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 inwater checks

handle nonfunctional equipment items

implement contingency and emergency drills such as:

buddy breathing

ditching drills

unconscious companion diver drills

maintain equipment during the dive

prepare equipment for the dive including charging of cylinders

recover and clear mask and mouthpiece

refurbish equipment postdive

safely enter and exit the water appropriate to the launch platform, equipment and conditions

switch from primary to the reserve air system.

Consistency in performance

Competency will be demonstrated over a minimum of 15 dives with the diver diving to a depth not greater than 40 m using CCBA (N2O2) in open water that includes the following requirements:

day and night

oceans

seas, lakes and rivers

subsurface conditions:

a range of surface and subsurface 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

Inwater time

Remarks

Between 040m

15

600 min

Total accrued subsurface time (010m)

Special Qualifiers (included within above)

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 a complete range of CCBA (N2O2) diving, safety and accessory equipment.

Required Skills and Knowledge

This describes the essential skills and knowledge and their level, required for this unit.

Required Skills

conduct buddy breathing

conduct ditching drills

conduct lost buddy drills

conduct unconscious companion diver drills

fit and check CCBA (N2O2)

identify distress and illness in others at depth

inspect and prepare CCBA (N2O2)

monitor CCBA (N2O2) equipment and gauges

recover and clear mask and mouthpiece

refurbish CCBA (N2O2) post-dive

Required Knowledge

CCBA (N2O2) dive equipment characteristics and limitations

CCBA (N2O2) characteristics and limitations

dive physics

dive physiology and medicine

general occupational/diving safety awareness

hazards of nitrox

marine animal threats

marine hazards

oceanography

relevant references and Australian Standards

safe operating ranges for air-supplies

Range Statement

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 includes:

hoses

pumps

Protective equipment may include:

boots

gloves

goggles

CCBA (N2O2) includes:

N2O2 cylinder

counter-lung

emergency cylinder

facemask/mouthpiece

scrubber material

Operator level maintenance may include:

checking existing pressure in cylinders with pressure gauge

conducting charging in (N2O2) 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