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Evidence Guide: DEFDV017B - Employ thermal cutting and welding tools (non-load bearing) in an underwater environment

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

 

DEFDV017B - Employ thermal cutting and welding tools (non-load bearing) in an underwater environment

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

Prepare for cutting and welding underwater

  1. Work task, worksite data and work object (including composition and condition) are determined and analysed to determine the specific requirements for thermal cutting and welding tools.
  2. Work plan is developed consistent with the dive plan.
  3. Thermal cutting and welding tools, and protective equipment appropriate to the task are selected, inspected and prepared.
  4. Electrical generator and associated leads are selected, inspected and prepared.
  5. Oxy-acetylene gas cylinders and associated hoses are selected, inspected and prepared.
  6. Thermal cutting and welding tools, the generator, oxy-acetylene gas cylinders, and associated leads and hoses are secured safely to/from the dive site.
  7. Access obstructions and other hazards are assessed and action is taken to remove/reduce risk.
Work task, worksite data and work object (including composition and condition) are determined and analysed to determine the specific requirements for thermal cutting and welding tools.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Work plan is developed consistent with the dive plan.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Thermal cutting and welding tools, and protective equipment appropriate to the task are selected, inspected and prepared.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Electrical generator and associated leads are selected, inspected and prepared.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Oxy-acetylene gas cylinders and associated hoses are selected, inspected and prepared.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Thermal cutting and welding tools, the generator, oxy-acetylene gas cylinders, and associated leads and hoses 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 risk.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Operate thermal cutting and welding tools underwater

  1. Thermal cutting and welding tools are secured on self during the dive for ease of accessibility and lack of interference with mobility and dive equipment.
  2. Safe routes for leads and hoses to the worksite are established.
  3. Work-safe area is established and location and safety of divers is confirmed prior to commencing work tasks.
  4. Surface of the work object is prepared for the cut or weld.
  5. Voltage and amperage of arc-welding equipment is controlled.
  6. Gas supplies are turned on and ratios of oxygen and acetylene are set and adjusted.
  7. Pressure of oxy-acetylene torch is controlled.
  8. Cuts and welds are made ensuring minimal distortion to the object.
  9. Employment hazards of cutting and welding tools are managed.
Thermal cutting and welding tools are secured on self during the dive for ease of accessibility and lack of interference with mobility and dive equipment.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Safe routes for leads and hoses to the worksite are established.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Work-safe area is established and location and safety of divers is confirmed prior to commencing work tasks.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Surface of the work object is prepared for the cut or weld.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Voltage and amperage of arc-welding equipment is controlled.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Gas supplies are turned on and ratios of oxygen and acetylene are set and adjusted.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Pressure of oxy-acetylene torch is controlled.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Cuts and welds are made ensuring minimal distortion to the object.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Employment hazards of cutting and welding tools are managed.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Thermal cutting and welding tools are temporarily disconnected and rendered safe to evaluate the work task.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Cuts and welds are inspected and cleaned.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Operate the generator

  1. Pre-start checks are performed and leads are connected.
  2. Power is developed gradually without surging and generator is stabilised and trimmed to required work output.
  3. Routine operational checks are conducted and warning signs are diagnosed and addressed.
  4. Generator is shut down.
  5. Emergency shut-down drills are conducted..
Pre-start checks are performed and leads are connected.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Power is developed gradually without surging and generator is stabilised and trimmed to required work output.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Routine operational checks are conducted and warning signs are diagnosed and addressed.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Generator is shut down.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Emergency shut-down drills are conducted..

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Conclude underwater cutting and welding operations

  1. Environmental impact arising from use of thermal cutting and welding tools is minimised and waste products are recovered.
  2. Thermal cutting and welding tools, the generator, gas cylinders and associated leads and hoses, and protective equipment are de-serviced after use.
Environmental impact arising from use of thermal cutting and welding tools is minimised and waste products are recovered.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Thermal cutting and welding tools, the generator, gas cylinders and associated leads and hoses, and protective equipment are de-serviced after 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:

cut a12 mm steel plate using a thermal arc or oxy arc cutting torch

weld together two pieces of approximately 12 mm steel plate underwater using electric welding equipment to produce a fillet weld

attend to personal and collective safety

consider the environmental impact as part of the dive plan.

Consistency in performance

Competency should be demonstrated during a number of work tasks where:

the depth is between 5 metres and 20 metres

at least one night work task is undertaken.

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 dive location, and thermal cutting and welding equipment.

Required Skills and Knowledge

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

Required Skills

ability to dive

cut steel plates

diagnose equipment faults

operate a generator

take remedial actions

undertake general operator maintenance

weld

Required Knowledge

control of output

dangers of trapped gas and its avoidance

dive equipment

dive physics

equipment (generator, thermal cutting and welding, tools, hoses and leads)

general occupational/diving safety awareness

methods of resolving problems

oceanography

physics of operation

principles of operation

relevant references and Australian Standards

thermal cutting and welding on land

work hazards

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.

Work tasks may include:

cutting

gouging

heating

welding

Worksite data may include:

current

depth

gradient

hazards

obstacles

Work object may include:

anchorage

pipe

sheet (hull)

support/strut

Composition may include:

aluminium

high and low alloy steels

high and low carbon steels

mild steel

stainless steel

Thermal cutting and welding tools may include:

oxy-torch

arc-welder

Protective equipment may include:

boots

eye protection

gloves

hood/helmet

Selecting, inspecting and preparing thermal cutting and welding tools may include:

inspection of stick

neck/mouth of oxy-torch

regulation of amperage and voltage

security of earth (bull-dog) lead

Selecting, inspecting and preparing the generator may include:

checking fluids

fuelling

pre-start checks

Selecting, inspecting and preparing the oxy-acetylene gas cylinders may include:

checking gas lines

checking gas pressures and mixing ratios

physical security of bottles

Hazards may include:

danger zone of objects being worked on

impact on dive equipment (e.g. hoses, gauges, communications)

release of fuels and associated chemical contaminants resident at the worksite

retinal damage

shock and burn

trapped air explosions

Action to remove/reduce the risk may include:

erecting signage

using patrol/sentry craft

Routine operational checks may include:

fuel

fluids

pressure

temperature

Warning signs may include:

feed variations

rise/fall in temperature

smoke

surging (rise/fall in power)

unusual noise

unusual smell (e.g. oil)

Environmental impact includes:

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

refilling

re-fuelling

washing in fresh water