If you respond with "but they're not rated B" or "it isn't done that way" I will rate your response boring. These are obviously true. But they are used in boats and they are rated, both USCG and abroad. Really.
The USCG says these are the minimums, although you can add more. If you've ever had a fire on a boat
, you'll want more.
With approved Fixed Systems
3 B-1 or 1 B-II and 1 B-1
B is the UL rating for oil
and gasoline fires. (Note if you Google
: US and Euro fire categories are different, although they both used letters. The numbers relate to different tests as well.) There is no requirement for type C (electrical) or type A (wood, cloth, fiberglass
etc.). The B numbers are related to standard tests. The C rating only means it is not conductive. In the case of the A rating, it is known to be equivalent to 125% of the number in gallons of water
. Fore example, A 2A fire extinguisher contains 2.5 gallons of water
. If you look at the ratings of dry chemical extinguishers, 1A10B:C is typical. If you have a 1B extinguisher, that means it is equivalent to 2 ounces of water. Small wonder they aren't much good for puting out fires including paper and fiberglass
. It's right in the rating. They don't even rate them for ordinary combustibles because they stink at it.
In the UK and Europe
, water mist (not water spray--a fine fog) has some popularity. https://www.admiralyacht.com/admiral...her-tips-ydsa/
The USCG also approves mist systems for shipboard use. I understand they are quite common in engine
* Not as good on oil
. But they do not spread it like a water stream and they are somewhat effective if used intelligently.
* Not B rated. You still need a B extinguisher.
* Much better on wood, cloth and fiberglass. 10 times better. It cools the embers, other types do not.
* No hazardous fumes... other than the fire itself.
* Reduced visibility problems. You have to use a dry chemical in a tight space to understand how bad this is.
* Very little damamge, since very little water is used. DI water is not corrosive.
* Safe around electrical equipment
(C rated). DI water is no conductive and they use very little.
Thoughts, as a secondary extinguisher? I have no opinion at this time, I'm just posting
this as a conversation starter.