Why should acetylene cylinders be stored in an upright position?

Question:

Answer: Acetylene cylinders must be stored in an upright position to allow proper securing and to prevent liquid acetone from escaping. If the cylinders used for gas welding are stored laying down or upside down, liquid acetone will enter the valve passages. When the torch is used, highly flammable liquid acetone will flow from the torch instead of the desired acetylene gas.

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