Document ID: chunk:federal_register_of_legislation:F2016L00419:body:0:p14
Version: federal_register_of_legislation:F2016L00419
Segment Type: other
Provision Reference: 
Character Range: 35230–38064

could be increased by exposure to an oxygen rich atmosphere
at your workplace. Fires in oxygen rich atmospheres are very difficult to extinguish. When
oxygen comes in contact with oil, grease, other hydrocarbons or oil based substances, it can spontaneously ignite and result in a fire or explosion. For example, containers with potentially flammable materials and pressurised cylinders, pipes or vessels should never be cut.
Under the WHS Regulations an atmosphere is a hazardous atmosphere if the concentration of a flammable gas, vapour, mist or fume exceeds five per cent of the lower explosive limit for the gas, vapour, mist or fume. The criteria for classification of hazardous areas are described in AS/NZS 60079: (series) Explosive atmospheres and AS/NZS 61241.10: Electrical apparatus for use in the presence of combustible dust – classification of areas where combustible dusts are or may be present.
You may need to develop specific procedures for welding in a hazardous atmosphere or hazardous area. For example, the WHS Regulations requires a 'confined spaces entry permit' for work in a confined space. When welding in an area that is not a confined space, you should still document specific procedures which should include the issue of a 'hot work permit'. For further guidance about 'hot work' or 'hot work permit' refer to AS 1674.1: Safety in welding and allied processes - Fire precautions. You should also take into consideration the areas and businesses surrounding the workplace.

Control measures
    * Isolate fuel sources from ignition sources.
    * Purge all traces of flammable or combustible materials from drums, vessels and tanks which are to be welded prior to welding, and preferably fill with an inert substance such as nitrogen gas or water.
    * Use fire resistant barriers to prevent welding sparks accidently reaching flammable
      and combustible materials.
    * Check work areas are well ventilated to prevent accumulation of flammable vapours
      in the work area.
    * Check work area is free from rubbish, paper or dust that could be potential fuel sources
      or produce dust explosions.
    * Use flash back arrestors on gas hoses to prevent the flames travelling back and igniting
      the gas in cylinder.
    * Drain and purge equipment, such as gas hoses, and lock the gas off at the valve immediately after use.
    * Do not store flammable and combustible materials near welding area.
    * Keep and maintain fire fighting equipment near welding area.

3.5 Burns and exposure to heat

Regulation 40: A person conducting a business or undertaking must ensure, so far as is reasonably practicable, workers carrying out work in extremes of heat or cold are able to carry out work without  risk to health and safety.
Regulation 209: Persons with management or control of plant