In acetylene handling, drawing from a cylinder is safe only when the cylinder is upright.

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Acetylene is stored under high pressure as a gas dissolved in acetone within a porous filler. Because of this design, keeping the cylinder upright ensures that only gas exits the valve and regulator, while the liquid acetone stays below the outlet. When the cylinder is upright, the gas drawn off remains dry and the regulator remains protected from liquid contamination. If the cylinder is inverted, on its side, or tilted, liquid acetone can be drawn into the regulator and hose, which can clog the regulator, contaminate the gas stream, or create a hazardous condition such as a flashback or fire risk. Therefore, maintaining an upright position during drawing guarantees a safer, more reliable gas flow. If you need to move or reposition a cylinder, close the valve and keep it upright and secure.