Which action should NOT be taken when dealing with a gas cylinder fire?

In the context of handling a gas cylinder fire, trying to extinguish the fire with water is inappropriate and potentially dangerous. Gas fires, particularly those involving gas cylinders, can behave unpredictably, and applying water can lead to several hazards. Water can cause the burning gas to spread, increase the fire's intensity, or create explosive mixtures if the water contacts certain types of burning gases. Furthermore, water may not effectively extinguish the flame because gas is typically lighter than water and can float on its surface.

In situations involving gas cylinders, observing the fire from a safe distance allows for an assessment of the situation without putting oneself in harm's way. Closing the valve of the cylinder, if safe to do so, can help contain the fuel source, but must be approached with caution to avoid explosion or injury. Calling for professional help ensures that trained responders can handle the fire with the appropriate equipment and knowledge to deal with hazardous materials safely.