Oxygen is not flammable but supports combustion. Oxygen enrichment of the atmosphere, even by a few per cent, considerably increases the risk of fire. Materials not normally combustible in air my burn vigorously or even ignite without any apparent reason in enriched air.
 
  • Shut off all engines, electrical equipment and other sources of ignition.
  • No smoking or naked lights.
  • If available, use emergency equipment stops.
  • Stop leaks if possible, especially in enclosed or inadequately ventilated rooms. Move people from area.
  • Check all lines and equipment for leaks, with periodic rechecks. All fittings and connections should be properly fitted.
  • If leak continues, move cylinder to a safe area and allow to empty.