CO₂ system — NRL

Carbon dioxide, discharged from a cylinder bank through fixed pipework, floods an enclosure and puts the fire out by lowering the oxygen. For normally unoccupied spaces where water would do harm — turbine enclosures, cable galleries, electrical and machinery rooms.

Scope of work

• Hazard survey. The space, its openings and ventilation, what is in it, and whether people can enter it.
• Design. Total flooding or local application, design concentration and hold time, agent quantity, nozzle layout and flow calculation.
• Supply. Cylinders and valves, pilot cylinders, manifold, selector valves, nozzles, and the detection and release panel.
• Installation. Cylinder bank, pipe network, nozzles, detection, alarms, lock-off valve and warning signs.
• Commissioning. Detection, time delay, alarms, abort and release sequence tested, and the enclosure checked for leakage.
• Handover. As-built drawings, test records and operating and maintenance manuals, with training for the people who will run the system.