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.
- Routine operational 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