Due to the large amount of potential energy resulting from compression of the cylinder, gas cylinders should be handled as high energy sources and as a potential explosive. If a cylinder falls and breaks a valve, the energy released is sufficient to propel the cylinder through concrete walls. In addition, the gases contained in the cylinders are hazardous because of their flammable, toxic and corrosive properties. The most common hazard associated with gas cylinders is leakage from regulators which allows the gas to diffuse throughout the room. Flammable gases can mix with air causing fires and explosions.
Most flammable gases have explosive ranges greater than flammable liquid vapors.
Additional hazards arise from the high toxicity and corrosive properties of many of the gases. Usually, there is no visual warning or odor associated with the escaping gases. Some gases are toxic at concentrations below the odor threshold and some gases can quickly paralyze the sense of smell. Even harmless gases such as nitrogen may displace the oxygen in an unventilated room and cause asphyxiation. The best protection against accidents is knowledge of proper handling and storage techniques.