Other than an 18 pound rated fire extinguisher, what other method of control is acceptable for handling propane emergencies?

Using large quantities of water or water spray is an acceptable method for controlling propane emergencies because water acts to cool the propane flames and reduces the temperature of burning materials. It can effectively extinguish flames by removing heat, which is one of the fundamental components of the fire triangle (heat, fuel, and oxygen). When dealing with propane fires, sufficient amounts of water can help to create steam, which can displace oxygen and further aid in extinguishing the fire.

It's important to consider that while water is effective, it must be used cautiously, particularly in situations involving pressurized gas cylinders, as water can contribute to the risk of explosions if the propane vapor is ignited. In addition, water is generally compatible for use in firefighting with propane due to the nature of combustion and the properties of propane as a fuel.

The other methods mentioned may not be as universally applicable or effective in all fire situations related to propane. Dry chemical agents, sand, or soil could potentially be used in certain conditions, but utilizing large quantities of water provides a broader and more reliable approach for quickly reducing heat and managing propane-related fires.