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1. Why shouldn’t acetylene cylinders be used up completely? The gas inside the bottle is exhausted, the pressure inside the bottle equals the atmospheric pressure, and air can easily mix in, forming a mixture of acetylene and air. The explosive limit of acetylene is 2.3’100% (by volume). When filling an air-mixed acetylene cylinder, the high-pressure acetylene inside the cylinder can easily get torn apart when mixed with air ； Acetylene has unstable chemical properties and is prone to decomposition reactions. A small amount of energy (such as shock and vibration) can cause decomposition and explosion. Even without oxygen, air, and other combustion aids, pure acetylene will explode at pressures above 0.2 MPa. The acetylene cylinder is filled with solvent. As the acetylene pressure inside the cylinder decreases, the amount of solvent discharged from the cylinder along with the acetylene gradually increases. As acetylene is consumed, solvent loss increases, which poses an explosion risk during filling, transportation, storage, and use. 2. Why cannot acetylene cylinders be placed on insulating pads? Acetylene cylinders placed on the ground can accumulate static electricity at any time. If placed on an insulating rubber pad, static electricity cannot be eliminated, and static sparks will be generated to some extent, potentially causing an explosion. 3. Why does an acetylene gas cylinder have two pressure gauges? The intake side features a pressure gauge used to measure the air pressure inside the cylinder, with values ranging from 0 to 4 MPa. The low-pressure gauge is used to measure the pressure of the cutting hose at the air outlet. This value is very small (0-0.25 MPa). When in use, first turn the cylinder valve two full turns, then adjust the pressure regulator. Setting the low-pressure gauge at around 0.03 MPa is sufficient to cut steel plates with a thickness of 1 cm. 4. Why cannot acetylene cylinders be inverted? The acetylene cylinder is filled with filler and solvent. When used horizontally, the solvent easily flows out along with the acetylene gas. This not only increases solvent consumption, but also lowers the combustion temperature and affects performance. At the same time, tempering occurred, causing the acetylene cylinder to explode. Acetylene cylinders are prone to rolling and being struck when placed horizontally, which can lead to combustion and explosion accidents. Acetylene cylinders are equipped with shock-absorbing rubber rings to prevent collisions during loading, unloading, transportation, and use. A rubber ring is an insulating material. Placing it horizontally corresponds to placing the acetylene cylinder on an insulator, which prevents static electricity on the cylinder from spreading to the ground. It accumulates on the cylinder, making it easy to generate static sparks. If there is an acetylene leak, it can easily lead to fires and explosions. The acetylene cylinder valve is equipped with a pressure reducer, a flame arrester, and a rubber hose. Since it tends to roll when placed horizontally, rolling can easily damage the pressure reducer, flame retardant, or break the rubber hose, resulting in acetylene leakage and fire explosions. 5. Why cannot acetylene cylinders be exposed to sunlight? When performing gas welding and cutting, acetylene cylinders and oxygen cylinders must not be exposed to sunlight. Solar radiation can cause the pressure inside the cylinder to rise, leading to an explosion of the cylinder.