Chap 8 Extinguishing Agents

Question 1

Document created by fire service personnel to detail the various aspects of a building before a fire or incident at the building.

Answer 1

Pre incident plan

Question 2

Systematic approach to learning the major components of a building in order to obtain information that can be used at a future fire or other incident at that building.

Answer 2

Preincident planning

Question 3

Materials used to extinguish the fire.

Answer 3

Extinguishing Agent

Question 4

Pressure on a water distribution system during normal demand

Answer 4

Normal Operating Pressure

Question 5

When water is heated to the boiling point, it converts to steam and expands how much?

Answer 5

at 212f water expands 1700 times its original volume.

Question 6

Three basic methods water extinguishes fire:

Answer 6

Cools the burning material
Smothers the fire
Separates the fuel from heat

Question 7

The amount of water needed to smother a fire.

Answer 7

Flow requirement

Question 8

How many nationally accepted formulas for figuring flow requirement? What are they?

Answer 8

3

1. National Fire Academy Formula
2. Iowa State University Formula
3. Insurance Services Office Formula

Question 9

National Fire Academy Formula

Answer 9

NFF=(LxW/3)x Percentage involved

Question 10

Iowa Formula?

Answer 10

NFF= V/100

V=Volume (LxWXH)

Question 11

This type of nozzle has a tremendous amount of cooling capability because of its great surface area due to more droplets.

Answer 11

Fog nozzle.

Question 12

Potential Problems With fog nozzles.

Answer 12

Higher operating pressures.

Can disrupt natural thermal layer if applied incorrectly

Can create steam

Question 13

This nozzle has greater reach and penetration. Wind does not affect the stream as much as others.

Answer 13

Smooth bore nozzles.

Question 14

The pressure that is lost during while trying to create an effective fire stream.

Answer 14

Friction Loss

Question 15

Steps to reduce friction loss

Answer 15

• Reduce Hose Length
• Larger Hose
• Reduce number of couplings and appliances
• Reduce number of bends and kinks
• Nozzle Types

Question 16

Three steps that can be used to figure the pump discharge pressure?

Answer 16

1. Calculate the constant.
   
   1. Nozzles (100 or 75 psi , 80 for master, 50 for smooth bore)
2. Calculate additional pressure needed due to elevation
3. Calculate FL in the hose

Question 17

Simpler term formula determining GPM

Answer 17

29.7 X tip diameter squared X Square Root of the pressure

Question 18

Whats the subsurface injection technique with foam?

Answer 18

Tactic of introducing foam at the bottom of a bulk storage tank, allowing the foam to float to the top and blanket the product.

Question 19

Two basic types of hazardous materials foam is typically used on.

Answer 19

Hydrocarbons and polar solvents

Question 20

Petroleum based products such as gasoline, benzene, and toluene.

Answer 20

Hydrocarbons

Question 21

Water soluble compounds. Alcohol based products such as ethanols, ketones, lacquer thinners and even some acids

Answer 21

Polar Solvents

Question 22

What percent to manufacturers of foam require for Polar Solvents?

Hydrocarbons?

Answer 22

6% for Polar Solvents

3 % hydrocarbons

Question 23

Ingredients to create a foam blanket?

Answer 23

Air

Water

Foam

Created by mechanical agitation

Question 24

When using an inline eductor a vacuum is created through what?

Answer 24

Venturi

Question 25

A foam system in which compressed air is injected into the foam solution prior to entering any hose line.

Answer 25

Compressed air foam system (CAFS)

Question 26

Common chemicals used in the two types of dry chemical extinguishers?

Answer 26

Sodium Bicarbonate ( b c )

Potassium Bicarbonate ( b c)

Potassium Cholride (B c )

Monoammonium Phosphate ( ABC)

Barium Sulfate (ABC)

Ammonium Phosphate (ABC)

Question 27

What type of extinguishing agent is used on Class D combustible metals ?

Answer 27

Dry Powder

Question 28

Extinguishing agent found in kitchen hoods?

Answer 28

Wet Chemical Class K

Question 29

This type of extinguishing agent was banned under the Clean Air Act of 1994

Answer 29

Halons

Question 30

As a guideline For Insurance Services Office, pre plans should be updated how often?

Answer 30

On a yearly basis.