In restricted visibility, a power-driven vessel under way gives which sound signal every two minutes
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A fire extinguisher in class B is used against: FLAMMABLE LIQUIDS such as paraffin, petrol, oil etc.
The letter B refers to Class B fires involving flammable liquids, such as fuel. The US Coast Guard regulations specify a series of extinguishers by their relative ability to extinguish increasing amounts of fire.
A B-I extinguisher (required on just about any powerboat) would correspond to the extinguishing characteristics of a UL listing 5-B:C, rated for 5 sq ft of liquid fire, with 2 pounds of dry chemical. However, B-I could also be a CO2 extinguisher with 4 pounds or a foam extinguisher with 6 quarts of capacity.
In addition to a B-I capacity, a marine extinguisher would also be required to have a USCG certification before it could be marketed or installed as USCG B-I.
A UL 1-B fire extinguisher, on the other hand, means it has a UL rating of 1-B. The unit will extinguish a 1 sq. ft. flammable liquid fire by a novice user.
For reference, a B-II has 5 pounds of dry chemical, or 15 pounds of CO2 or 10 quarts of foam.
Like any other Class B fire extinguisher, a B-1 or B-I extinguisher puts out fires involving flammable liquids. To have a B-1 rating it would need the ability to extinguish at least 5 square feet of flaming liquid (i.e., 2 pounds of dry chemical or 4 pounds of CO2 or 6 quarts of foam). It would also have to conform to US Coast Guard regulations for packaging, labeling and so forth to get a USCG rating.
You can use a type B extinguisher on all type B fires which include flammable and combustible liquid fires like oils, diesels, petrol etc.
Most commonly a dry chemical extinguisher, it uses a chemical powder, and will work on type A, B and C fires. The powder is usually ammonium tri-phosphate.
flammable liquids
gas and liquids
A type b extinguisher puts out a class B fire, i.e., flammable/combustible liquids and gases.
Liquid
The type of fire it is designed to extinguish
You need to use a Class B extinguisher on flammable liquids.
Burning liquids such as gasoline, kerosene, paint, acetone, and so on.
type B
A shoe factory is likely to have Class B hazards requiring an ABC or BC type of fire extinguisher.
B-1 is for a Class B fire, that is, flammable/combustible liquids and gases.
Type B
ABC, BC or C. It is often best to disconnect the electrical power and use an extinguisher appropriate for whatever type of fuel happens to be burning (A or B). Do NOT use a water-type A fire extinguisher on an energized electrical fire.
B
Class B