What is the purpose of the water spray system in totally enclosed fire-protected lifeboats?

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The water spray system in a totally enclosed fire-protected lifeboat is there to combat fires on the water near the craft and to protect the occupants by cooling and shielding the boat. By spraying water over and around the lifeboat, a cooling layer forms that reduces heat from any oil fire on the water surface and helps dampen flames that could otherwise reach the top cover. Keeping the entire survival craft wet, especially the top cover, also helps prevent ignition of flammable vapors and protects the boat’s fabric and equipment from heat damage. This fire protection purpose is why the system is used, rather than for drying surfaces, cooling an engine, or cleaning the hull.