How should acetylene cylinders be stored?

Acetylene cylinders must be stored upright to ensure safety and proper functioning. When stored vertically, the valve remains at the top, which protects the integrity of the cylinder and prevents liquid acetylene from escaping. If acetylene is released in liquid form, it can pose significant hazards including the potential for violent reactions or explosions, as acetylene is a highly flammable gas. Additionally, when cylinders are stored upright, it allows for proper ventilation and minimizes the risk of damage to the cylinder itself, ensuring the safety of personnel handling these materials. Storing acetylene horizontally could lead to the escape of acetylene in a liquid state, which is dangerous, while other options such as storing in any position or submerged in water do not comply with safety standards regarding acetylene handling.