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Evidence Guide: DEFDV013B - Employ air-lift devices underwater

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

 

DEFDV013B - Employ air-lift devices underwater

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

Prepare for underwater air-lift operation

  1. Load metrics and worksite data are determined and analysed to determine the specific requirements for the air-lift bags.
  2. Work plan is developed consistent with the dive plan.
  3. Air-lift bags are selected, inspected and prepared.
  4. Air-lift bags are secured safely to/from the dive site.
  5. Access obstructions and other hazards are assessed and action is taken to remove/reduce the risk.
Load metrics and worksite data are determined and analysed to determine the specific requirements for the air-lift bags.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Work plan is developed consistent with the dive plan.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Air-lift bags are selected, inspected and prepared.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Air-lift bags are secured safely to/from the dive site.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Access obstructions and other hazards are assessed and action is taken to remove/reduce the risk.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Operate air-lift devices

  1. Air-lift bags are secured to the object's lift point/s.
  2. A work-safe area is established and the location and safety of divers is confirmed prior to commencing the lift.
  3. Air-lift bags are inflated and adjusted to control buoyancy.
  4. Movement of the object is effectively controlled.
Air-lift bags are secured to the object's lift point/s.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

A work-safe area is established and the location and safety of divers is confirmed prior to commencing the lift.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Air-lift bags are inflated and adjusted to control buoyancy.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Movement of the object is effectively controlled.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Conclude air-lift operations

  1. Environmental impact arising from the work task is minimised and waste products are recovered .
  2. Air-lift bags are de-rigged from the object.
  3. Air-lift bags are de-serviced and stored for re-use.
Environmental impact arising from the work task is minimised and waste products are recovered .

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Air-lift bags are de-rigged from the object.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Air-lift bags are de-serviced and stored for re-use.

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 attend to personal and collective safety; and to consider the environmental impact as part of the dive plan.

Consistency in performance

Competency should be demonstrated during the following airlift operations with manually inflated airbags:

1 x vertical lift to surface

lift distance – at least 5 metres (object must breach surface)

depth – between 5 to 20 metres

weight – at least 250 kg

1 x lateral lift

lateral distance – at least 10 metres

depth – between 5 to 20 metres

weight – at least 250 kg.

Context of and specific resources for assessment

Context of assessment

Competency should be assessed in the ocean.

When practicable, assessment should relate to the diver’s vocational focus.

Specific resources for assessment

Access to a complete range of diving, safety and accessory equipment; airlift equipment; and submerged objects.

Required Skills and Knowledge

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

Required Skills

check equipment

control neutrally buoyant objects

inflate air-lift bags

inspect equipment for serviceability and functionality

planning

rig equipment

Required Knowledge

characteristics and employment of air-lift bags

determination of mass of submerged objects

dive equipment

dive physics

general occupational/diving safety awareness

marine hazards

oceanography

relevant references and Australian Standards

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.

Load metrics may include:

centre of gravity

composition

dimensions

lift points

weight

Worksite data may include:

current

depth

gradient

hazards

obstacles

Selecting, inspecting and preparing air-lift bags may include:

checking attachment lines and points

inspecting the neck

inspecting the outer skin

test fill

Action to remove/reduce the risk may include:

erecting signage

using patrol/sentry craft

Effectively controlling the object's movement may include:

both lateral and vertical adjustments

Environmental impact may include:

contamination of surrounding water (e.g. leaking oil)

physical damage to reef and associated floor eco-systems (e.g. coral)

visual pollution of waste material (e.g. concrete and metal parts)

De-servicing may include:

drying

logging work details into equipment logs

oiling/greasing

washing in fresh water