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Old 09-08-2017, 19:11   #31
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Re: Universal Fire extinguisher type

For engine room fires, what about installing a heat sensitive sprinkler in the engine room, plumbed to the boats pressurized fresh water system?
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Old 09-08-2017, 19:19   #32
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Universal Fire extinguisher type

Water is not the best for a fuel fire, now if mixed with foam, then that is different.
Water can spread a fuel fire and actually explode the fire if the flammable liquid is above the boiling point of water, water sinks in the liquid and very rapidly boils and scatters burning fuel everywhere, think kitchen grease fire.
I will soon mount a cheap video camera in my engine room as my B&G plotter will display video. I figure one there and another in the bilge. A port into the engine compartment that you can discharge a fire extinguisher through is better than taking the whole panel off too.
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Old 09-08-2017, 20:41   #33
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Re: Universal Fire extinguisher type

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Originally Posted by a64pilot View Post
Water is not the best for a fuel fire, now if mixed with foam, then that is different.
Water can spread a fuel fire and actually explode the fire if the flammable liquid is above the boiling point of water, water sinks in the liquid and very rapidly boils and scatters burning fuel everywhere, think kitchen grease fire.
I will soon mount a cheap video camera in my engine room as my B&G plotter will display video. I figure one there and another in the bilge. A port into the engine compartment that you can discharge a fire extinguisher through is better than taking the whole panel off too.
Of course, we all know that. But, in the enclosed space of an engine compartment, I'll bet it would fill up with steam and extinguish the fire. I'd like to see Mythbusters test this out!
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Old 09-08-2017, 21:30   #34
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Re: Universal Fire extinguisher type

These threads are great. I began to think about the type of fire extinguishing systems used in commercial kitchens where grease fires are common. Apparently, the state of the art systems are "wet chemical" or Class K systems, either as an engineered system, or separate fire extinguishers. The class K extinguishers are basically a solution of potassium acetate, fairly safe and non corrosive. They can be used on burning oil because they "form a crust over burning oil" (Wikipedia). Not cheap, but safe and effective.
https://www.zoro.com/amerex-fire-ext...60/i/G3697687/

So, this should be excellent for discharging into an engine compartment, and equally useful for class A fires since it is essentially water. For electrical fires, they would also be useful if the power were shut off first. It seems like this could be close to a "Universal fire extinguisher type" for boats, no?
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Old 10-08-2017, 03:31   #35
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Re: Universal Fire extinguisher type

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Of course, we all know that. But, in the enclosed space of an engine compartment, I'll bet it would fill up with steam and extinguish the fire. I'd like to see Mythbusters test this out!
I'll bet it won't. Fuel is lighter than water and spraying water on fuel will spread the fuel out increasing the size and scope of the fire. Once the fire is out then water can help prevent a fire restarting.

Also, think about where water would go. In our boat the water would run along the bilge under the floor boards into the main living space. That could bring the burning fuel out of the engine room and right under where a fire fighting crew would be standing.

Depriving the fire of oxygen until it goes out followed by cooling with water works. Halon is excellent for this as are some modern halon replacements. And they don't destroy the engine.
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Old 10-08-2017, 09:52   #36
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Re: Universal Fire extinguisher type

I don't know. I am assuming it is the tree huggers that are the problem with Halon. The lack of common sense probably exists. How often would an engine room system be discharged. If one were not, what would be the detrimental effect of a GRP boat burning to the waterline be on the eco system?
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Old 10-08-2017, 10:22   #37
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Re: Universal Fire extinguisher type

Halon is an ozone depleting chemical. Much more than R22 freon.
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