Why cannot acetylene cylinders be placed horizontally during hot work?

Acetylene is a flammable and explosive gas that tends to undergo chemical reactions such as polymerization and explosive decomposition when exposed to heat or pressure. The acetylene in the cylinder is dissolved in propane, which in turn is absorbed by porous fillers such as activated carbon or calcium silicate, thereby allowing the acetylene to be stored and transported in a stable and safe manner. It should be kept upright during use and storage, protected from vibrations and impacts, to prevent voids from forming in the porous filler.

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Same floor; there is propylene in the acetylene cylinder, Mark

1. Acetylene cylinders are filled with a filler and solvent (propane). When used in a horizontal position, propane tends to flow out along with the acetylene gas, which not only increases the consumption of propane but also lowers the combustion temperature, affecting performance. Additionally, this can lead to backfire and cause explosions in the acetylene cylinder. 2. When lying down, they tend to roll, and the bottles can collide with each other or with other objects, generating energy that can lead to accidents involving acetylene cylinders. 3. Since it rolls easily when laid down, this rolling can damage the pressure reducer, flame arrester, or detach the rubber hoses, allowing acetylene gas to leak out and causing a fire or explosion. 4. The acetylene cylinder is equipped with an anti-vibration rubber ring, which is made of insulating material. When the cylinder is placed in a horizontal position, it is as if it is resting on an electrical insulator; this prevents the static electricity generated on the cylinder from spreading to the ground, causing it to accumulate on the cylinder itself. This accumulation can lead to the formation of static sparks, and in the event of an acetylene leak, it can easily result in fires and explosions.

When an acetylene cylinder is placed on its side, it tends to roll, and impacts on the cylinder can damage its internal structure. Acetylene cylinders are equipped with shock-absorbing rubber rings to prevent damage to the cylinder due to collisions. However, the rubber ring is an insulating material; if the cylinder is placed in a horizontal position, the static electricity on it cannot be discharged, which can easily lead to static sparks

Summarizing everyone’s responses: The acetylene cylinder contains a porous filler soaked in propane, which allows acetylene to be stored safely inside the cylinder. When in use, the acetylene dissolved in propane evaporates, while the propane remains in the bottle to be refilled with acetylene for repeated use. The main reasons why acetylene cylinders cannot be placed horizontally during welding operations are as follows: (1) Acetylene cylinders contain fillers and solvents (propane). When placed horizontally, the propane tends to flow out along with the acetylene gas, which not only increases the consumption of propane but also lowers the combustion temperature, affecting the safe use of acetylene. Additionally, backflow can occur, leading to explosions of the acetylene cylinder. (2) When acetylene cylinders are placed horizontally, they are prone to rolling or colliding with each other, which affects the safety of using these cylinders. (3) Acetylene cylinders are equipped with shock-absorbing rubber rings, which serve to prevent collisions during loading, unloading, transportation, and use. However, these rubber rings are insulating materials; when the cylinder is placed in a horizontal position, it is as if the cylinder is on an electrical insulator. This prevents the static electricity generated on the cylinder from dissipating into the ground, causing it to accumulate on the cylinder itself. This accumulation can lead to the formation of static sparks, and acetylene has a very low ignition energy, so even the slightest discharge can ignite it. When acetylene gas leaks, cylinders lacking static electricity dissipation are highly prone to causing fires and explosions. (4) The cylinder valve of the acetylene cylinder is equipped with a pressure regulator and a flame arrester, and is connected by a rubber hose; lying on its side can cause the cylinder to roll, leading to damage to the attached equipment

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