Document ID: chunk:federal_register_of_legislation:F2024C01055:front:0:p28
Version: federal_register_of_legislation:F2024C01055
Segment Type: other
Provision Reference: 
Character Range: 69224–71946

4.15  Gas used for ventilation purposes
  The operator of a prescribed ship or prescribed unit must ensure that gas used for ventilation purposes is not pure oxygen or a gas mixture with an oxygen content greater than 21% by volume.
Penalty: 10 penalty units.

4.16  Isolating hazardous services
 (1) An operator of a prescribed ship or prescribed unit must ensure that, before a person enters or works in a confined space, all potentially hazardous services including all process services normally connected to that space are positively isolated in order to prevent:
 (a) the introduction of materials, contaminants, agents or conditions harmful to persons in the confined space; and
 (b) the activation or energising of equipment or services which could pose a risk to the health or safety of persons within the confined space.
Penalty: 10 penalty units.
 (2) In this regulation:
process services includes hot water pipes, sewer pipes and gas pipes.

4.17  Flammable airborne contaminants
 (1) Subregulation (2) does not apply to entry into a confined space for the purpose of responding to an emergency.
 (2) Before a person enters a confined space where a flammable contaminant is present in the atmosphere the operator of a prescribed ship or prescribed unit must ensure that:
 (a) the concentration of any flammable airborne contaminant is less than 5% of its LEL; and
 (b) the oxygen content of the atmosphere is no more than 23.5%.
Penalty: 10 penalty units.
 (3) If, after 1 or more persons have entered and are working in a confined space, the concentration of a flammable contaminant in the atmosphere of the confined space is found to be 5%, or greater than 5% and less than 10%, of its LEL, the operator of a prescribed ship or prescribed unit must ensure that:
 (a) the person or persons are removed from the confined space; or
 (b) there is continuous monitoring with a suitably calibrated detector for the flammable contaminant in the confined space at all times when the person or persons are present in the confined space.
Penalty: 10 penalty units.
 (4) If the concentration of a flammable contaminant in the atmosphere in a confined space is found to be 10% or greater of its LEL, the operator of a prescribed ship or prescribed unit must ensure that all persons are removed from the confined space.
Penalty: 10 penalty units.

4.18  Supplied‑air respiratory equipment
 (1) Subregulation (2) applies if, after all risk control measures have been undertaken for a confined space:
 (a) the oxygen content in the atmosphere in the confined space is 19.5% or less; or
 (b) the airborne contaminants in the confined space cannot be reduced to a level below the relevant exposure standards.
 (2) The operator