Ships and buildings are outfitted with inert gas fire suppression systems. In the event of a fire, the cylinder valves activate, filling a room or compartment with inert gas, displacing the oxygen. Since fire requires oxygen to continue combustion, removing the oxygen from the room or compartment stops the fire.
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This specific incident involved two employees moving a 600 psi (41 bar) Halon (fire suppression) cylinder to be weighed. Not knowing the exact specifications of this 4BW cylinder or capacity it is within the range of 48” (1.2m) tall and around 200 lbs (90 kilos).