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16. WELDING AND FLAME CUTTING 76 Gas cylinders Gas cylinders are categorized as pressure vessels. The pressure in the cylinder may be as high as 300 bars (approx. 300 times the atmospheric pressure) therefore, it is important to handle the cylinders carefully. Valves should be tightly closed always when the cylinders are not being used. Oxygen cylinders, their valves, and cylinder fittings are not to be touched with greasy hands due to the risk of explosion. Never allow oil or grease to come in contact with oxygen valves or cylinder fittings. When in use the cylinders should be placed so that the valves of the acetylene and oxygen cylinders don’t point toward one another. Storing of gas cylinders At the end of the working day bring the gas cylinders to a place designated for them and from where they can be easily evacuated. It is allowed to store several gas cylinders at the same time in the same place only in a place specifically designated for this purpose. A special permit from the fire chief or the gas supervisor at the yard is required to store the cylinders permanently in any other place. Keep them in an upright position and fasten them to prevent them from falling (motor gas cylinders are an exception). Don’t place the cylinders near any flammable materials in oily or greasy areas in poorly ventilated areas in areas where they can be exposed to heat in such a way that they might fall or tip or otherwise get damaged


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