Whenever carbon dioxide fire-extinguishing systems are subjected to
inspection or maintenance, strict safety precautions should be followed to prevent the
possibility that individuals performing or witnessing the activities are placed at risk.
Prior to performing any work, a safety plan should be developed to account for all
personnel and establish an effective communications system between the inspection
personnel and the on-duty crew. Measures to avoid accidental discharges such as locking
or removing the operating arms from directional valves, or shutting and locking the
system block valve should be taken as the initial procedure for the protection of
personnel performing any maintenance or inspections. All personnel should be notified of
the impending activities before work is begun.