In the United States, the Occupational Safety and Health Administration (OSHA), regulates and investigates workplace safety. Most countries have their equivalent of OSHA which works in a similar manner. OSHA may conduct random checks, follow up on registered complaints or investigate accidents involving the safety of workers.
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A 737 aircraft landed at an airport near the Caspian Sea. 142 passengers had departed along with the 5 crew members. The crew reported that the cabin oxygen pressure was at 900 psi. The ground crew was attempting to trans fill the oxygen from an 1800 PSI oxygen source. It is reported that the ground crew tested the equipment to assure the supply gas was at 1800 psi.
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.