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Common gases and hazards that might occur: Gas The place where Hazards caused How to prevent (name and chemical the gas accumulates: by leakage: the hazard: symbol) Oxygen (odorized oxygen) (O ) Acetylene (C H ) Liquidated gases Propane (C H ) Butane (C H ) Protective gases Helium (He) Nitrogen(N) Argon(Ar) Carbon dioxide (CO ) Accumulates in pits and trenches, heavier than air. Rises, lighter than air. Accumulates in pits and trenches, heavier than air. Noticeably lighter than air Noticeably heavier than air Oxygen causes fires to be more intense and lowers the ignition point, explodes when mixed with grease. Explosive when mixed with air Explosive when mixed with air Replaces oxygen => oxygen concentration decreases => suffocation When you smell a leak, close the valve in the distribution manifold or in the cylinder. Prevent sparks and high temperature build-up. Ventilate the space well. Have the leak repaired. An inert gas leak is very difficult to notice (they have no smell or color), always make sure there is sufficient ventilation. 2 2 2 3 8 4 10 16. WELDING AND FLAME CUTTING 2 75


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