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Command Qual Exam > NSTM 555 - Firefighting > Flashcards

NSTM 555 - Firefighting Flashcards

1
Q

What are the components of the Fire Tetrahedron?

A

Oxygen, Heat, Fuel, Chemical Reaction

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2
Q

What is a Class “A” fire?

A

Combustible materials that produce ash - wood, cloth, paper, etc

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3
Q

What is the primary and secondary agents for class A fires

A

Water in straight or fog patterns, or AFFF for deep seated fires

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4
Q

What are Class “B” fires?

A

Fuel, liquid, flammable oils and fluids, and flammable gases

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5
Q

What are the primary agents to combat a class “B” fire?

A

AFFF, Halon, Water mist

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6
Q

What is the most important step to combating a Gas “B” fire?

A

Securing the source of the leak/gas

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7
Q

What is a class “C” fire?

A

Electrical fire - once power is secured it becomes an “A”

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8
Q

What are the primary agents to combat a “C” fire?

A

CO2, Halon, Water spray

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9
Q

Why should PKP only be a last resort for “C” fires?

A

It is highly corrosive

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10
Q

What is a class “D” fire?

A

Combustible metals such as magnesium and titanium

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11
Q

What is the primary agents for a “D” fire?

A

Water, used in a fog from a safe distance as there may be small explosions when applied

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12
Q

How does water put out a fire?

A

Heat is removed in the form of steam, providing a cooling effect

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13
Q

Describe the use of a straight stream water pattern

A

Aimed from a distance at the base of a fire, used to break up the burning material and apply cooling at source of heat

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14
Q

What are the hazards of using a straight stream water pattern?

A

Can cause flooding below decks due to increased flow, more electrically conducive - don’t use on electrical fires

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15
Q

Why are fog patterns more effective than straight streams?

A

More effective cooling and heat absorption, and provides protection to the firefighters

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16
Q

What types of fuel is water effective at combating fires in?

A

High flashpoint fuels (over 140 F) such as F-76

17
Q

How do you employ water as an agent in a “B” fire?

A

Use narrow angle fog pattern to the leading edge of the flames in a sweeping pattern

18
Q

What is the Water to AFFF ratio?

A

94:6

19
Q

What are three advantages to using AFFF?

A
  1. Prevents fuel vapors from escaping
  2. Removes Oxygen from the fire
  3. Provides cooling effect
20
Q

Is AFFF or Water the better agent for “A” fires?

A

AFFF

21
Q

Discharge of AFFF to the sea is only allowed at what distance from shore?

A

12 NM

22
Q

How does CO2 put out fires?

A

It is 1.5 times heavier than air, so it smothers the fire and removes Oxygen

23
Q

How does Halon 1301 extinguish fires?

A

Chemically inhibits the fire

24
Q

What should happen upon inadvertent activation of Halon?

A

Evacuate spaces

25
Q

What is PKP primarily used for?

A

Class “B” Fires (smaller ones)

26
Q

How does PKP extinguish a fire?

A

It inhibits the combustion chain - it does not have a cooling effect

27
Q

What ship class is the Water Mist system found on and why?

A

LPD-17 class. It is a replacement for Halon since Halon is an Ozone Depleting Substance

28
Q

What PSI is the water mist system deployed at?

A

1000 PSI

29
Q

Advantages to Water mist over Halon?

A

No need for 30/60 sec delay time, non-ozone depleting, Non-toxic to personnel

30
Q

When is HFP used in place of Water Mist?

A

On newer class ships in unmanned spaces

31
Q

How is AFFF activated at each hosereel?

A

There is an electrical pushbutton that activates the system

32
Q

How is AFFF turned off from a hosereel?

A

There is no off button, the flow can be turned off at the nozzle

33
Q

What color boxes are AFFF Sprinkler activation switches contained in?

A

Red/Green striped boxes

34
Q

If a major oil leak is detected, what immediate actions can reduce the possibility of a fire?

A

Secure the oil source and cover surfaces with AFFF

35
Q

If you cannot stop the oil leak, what is another action that can help reduce the possibility of ignition?

A

Deflect the oil away from hot surfaces

36
Q

What types of fire prevention systems are installed in Gas Turbine and Diesel Engine Enclosures?

A

Halon, HFP, and CO2

Command Qual Exam (14 decks)

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