What should be done if a gas cylinder fire is extinguished?

After extinguishing a gas cylinder fire, it is essential to address the cylinder itself to prevent any potential hazards. Closing the valve is the correct action because it helps to stop any residual gas from escaping, which could lead to further fire hazards or the possibility of an explosion. By securing the valve, you minimize the risk of re-ignition or an uncontrolled release of flammable gas.

Cooling the cylinder with water could be beneficial during the fire but is not the first action to take after the fire is out unless there are specific protocols suggesting that cooling should continue, while ensuring the valve is closed. Leaving it alone may seem like a safe option, but without closing the valve, the potential for danger remains. Opening the valve slowly would also be very risky, as it could allow gas to flow freely, creating a fire hazard. Therefore, securing the cylinder by closing the valve helps ensure safety after the fire has been extinguished.