Apart from the cylinders used in gas-powered forklift trucks, why should you never see liquid petroleum gas (LPG) cylinders placed on their side during use?

The placement of liquid petroleum gas (LPG) cylinders is critical for safe handling and usage. When LPG cylinders are used, they should always be kept upright because if they are placed on their side, there is a risk that liquid gas could be drawn from the cylinder. LPG is stored under pressure and can exist as both a liquid and a gas. When the cylinder is upright, it allows the gas to vaporize and be drawn off correctly, preventing any liquid from entering the fuel lines of equipment, such as forklift trucks.

If liquid LPG were to be drawn, it could lead to operational issues and create a potential safety hazard such as a fire or explosion, as liquid gas does not behave the same way as vaporized gas when it combusts. Keeping cylinders upright ensures that the gas is safely dispensed in its appropriate state and helps maintain safety standards while operating gas-powered equipment.