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People will ask if a CO2 cylinder can be repurposed. Some have questioned if such a cylinder can be used as a tank to store compressed air. Others have asked about storing other gasses in such a tank, even propane, which is a highly flammable gas that is stored in pressurized liquid form. People will ask if a CO2 cylinder can be repurposed. Some have questioned if such a cylinder can be used as a tank to store compressed air. Others have asked about storing other gasses in such a tank, even propane, which is a highly flammable gas that is stored in pressurized liquid form. Repurposing CO2 cylinders for storing other gases requires careful consideration of factors such as cylinder material, previous contents, and compatibility with the intended gas. Unlike propane storage tanks, the CO2 tank lacks safety mechanisms for dealing with flammable gas and excess pressure buildup. CO2 cylinders are typically designed and manufactured to withstand the pressure and properties of carbon dioxide and composed of material that is non-reactive with CO2. Again, as an example, Propane could potentially react with the materials used in the construction of the CO2 cylinder, leading to corrosion, degradation, or even rupture of the cylinder. Further research is required to learn if the material used to construct a CO2 tank can safely contain propane without reaction and/or corrosion. Unlike propane (C3H8) storage tanks, the CO2 tank lacks safety mechanisms for dealing with flammable gas and excess pressure buildup. CO2 cylinders are typically designed and manufactured to withstand the pressure and properties of carbon dioxide and composed of material that is non-reactive with CO2. Again, as an example, Propane could potentially react with the materials used in the construction of the CO2 cylinder, leading to corrosion, degradation, or even rupture of the cylinder. It has been discussed where people have repurposed CO2 tank cylinders for C3H8 use on propane powered vehicles. They claim that after thorough cleaning and refurbishment of the cylinders that they can be used for storage of liquid propane. The source does not specifically discuss the CO2 tank construction material. Further research is required to learn if the material used to construct a CO2 tank can safely contain propane without reaction and/or corrosion. Some people have devised ways of using an air compressor to refill a CO2 tank. A typical air compressor won't reach much above 120-150 psi which they believe is well within tolerances. This strategy might be so that an individual can store and use compressed air away from a stationary installed compressor, such as filling a flat tire on a large automobile somewhere remote. Compressed air remains air, a gas, and the CO2 tank is designed to store liquid, not gas. This practice could be dangerous and could lead to a tank rupture and injury to the operator. Some people have devised ways of using an air compressor to refill a CO2 tank. A typical air compressor won't reach much above 120-150 psi which they believe is well within tolerances. This strategy might be so that an individual can store and use compressed air away from a stationary installed compressor, such as filling a flat tire on a large automobile somewhere remote. Compressed air remains air, a gas, and the CO2 tank is designed to store liquid, not gas. However there are sources that suggest CO2 cylinders can be repurposed to store compressed air for various applications, such as powering pneumatic tools, inflating tires, or providing air for recreational diving. Repurposing CO2 cylinders to store nitrogen (N2) could be feasible if the cylinders are properly cleaned and refurbished. Nitrogen gas is commonly used in industrial applications, such as welding, food packaging, and electronics manufacturing. Similar to nitrogen, CO2 cylinders could potentially be repurposed to store argon gas. Argon is often used as a shielding gas in welding applications or as an inert gas in various industrial processes. Oxygen cylinders are used in medical, industrial, and aerospace applications. While CO2 cylinders are not typically used to store oxygen due to safety concerns and regulatory requirements, they could potentially be repurposed for this use with proper testing, certification, and refurbishment.