Working in pressurised atmospheres
There are broadly two types of environments where pressurised atmospheres may be encountered. These are referred to here as ‘elevated pressures’ and ‘commercial workings’. See National Operational Guidance: Sub surface, height, structures and confined spaces.
The task of firefighting and rescuing people in pressurised workings is principally the responsibility of the on-site contractor. The fire and rescue service would continue to respond to a call to pressurised workings and might stand by to give advice and provide backup facilities if necessary. Where, subject to any prior agreement and arrangement, it is reasonably foreseeable that a fire and rescue service may be requested to support a contractor’s emergency arrangements, the limitations of its breathing apparatus and associated equipment must be taken into account.