What happens to a liquefied fuel gas cylinder when high volumes of gas are removed?

When high volumes of gas are removed from a liquefied fuel gas cylinder, the correct scenario is that the pressure drops and the temperature also drops. This phenomenon can be understood through the principles of gas laws and the characteristics of liquefied gases.

As the gas is removed, the amount of gas vapor in the cylinder decreases. Since the cylinder is filled with liquefied gas that vaporizes to maintain pressure, the removal of gas leads to a decrease in pressure as the equilibrium between the liquid and vapor phases is disturbed. Additionally, as the pressure drops, the temperature of the remaining liquid gas also drops due to the cooling effect associated with the vaporization process. This is known as the Joule-Thomson effect where a gas experiences a temperature change as it expands.

In summary, when gas is drawn from the cylinder rapidly, both the pressure and temperature decrease, making this scenario a key consideration in oxyfuel cutting practices where careful management of gas supplies is crucial for safe and efficient operation.