Regulation 96

There shall be an adequate supply of compressed air to a working chamber in a worksite.

A reserve supply of compressed air shall be made available at all times for every man-lock and medical lock located in a worksite.

The air intake for all air compressors of the air supply shall be located, as far as is reasonably practicable, at a place in the worksite where there are no fumes, exhaust gases or other air contaminants.

Instrumentation or gauges indicating the pressure in a working chamber in a worksite shall be provided near the air compressor and at the site office of the occupier of the worksite.

In any worksite with a compressed air environment —

The total capacity of the low pressure air compressors shall be sufficient to maintain the pressure in the air locks and working chambers in a worksite to cater for emergencies.

Every air main supplying the working chamber or air lock in a worksite shall be protected against accidental damage and where it is not practicable to provide such protection, an additional air main shall be provided.

At least 2 low pressure feedlines with regulating valves shall be provided for every working chamber in a worksite and at least one of them shall extend to within 30 metres of the working face of the tunnel.

The concentrations of toxic airborne contaminants in a compressed air environment in a worksite shall not exceed the permissible exposure levels in parts per million specified in the Workplace Safety and Health (General Provisions) Regulations (Rg 1).

Where measurements are made to determine the concentrations of toxic airborne contaminants in a compressed air environment in a worksite, the measured concentrations in parts per million shall be corrected to the atmospheric pressure, and the corrected concentrations shall not exceed the permissible exposure levels specified in the Workplace Safety and Health (General Provisions) Regulations.