Elements and Performance Criteria
- Prepare for cutting and welding underwater
- 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
- Work plan is developed consistent with the dive plan
- Thermal cutting and welding tools, and protective equipment appropriate to the task are selected, inspected and prepared
- Electrical generator and associated leads are selected, inspected and prepared
- Oxy-acetylene gas cylinders and associated hoses are selected, inspected and prepared
- Thermal cutting and welding tools, the generator, oxy-acetylene gas cylinders, and associated leads and hoses are secured safely to/from the dive site
- Access obstructions and other hazards are assessed and action is taken to remove/reduce risk
- Operate thermal cutting and welding tools underwater
- 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
- Safe routes for leads and hoses to the worksite are established
- Work-safe area is established and location and safety of divers is confirmed prior to commencing work tasks
- Surface of the work object is prepared for the cut or weld
- Voltage and amperage of arc-welding equipment is controlled
- Gas supplies are turned on and ratios of oxygen and acetylene are set and adjusted
- Pressure of oxy-acetylene torch is controlled
- Cuts and welds are made ensuring minimal distortion to the object
- Employment hazards of cutting and welding tools are managed
- Thermal cutting and welding tools are temporarily disconnected and rendered safe to evaluate the work task
- Cuts and welds are inspected and cleaned
- Operate the generator
- Pre-start checks are performed and leads are connected
- Power is developed gradually without surging and generator is stabilised and trimmed to required work output
- Routineoperational checks are conducted and warning signs are diagnosed and addressed
- Generator is shut down
- Emergency shut-down drills are conducted
- Conclude underwater cutting and welding operations