Intro to Automatic Sprinklers Ch 1-2

Question 1

What is the ignition temperature of normal combustable materials?

Answer 1

300-1,000 degrees F

Question 2

What are the 4 ways to extinguish a fire?

Answer 2

1. remove heat (cooling)
2. remove fuel
3. remove oxygen
4. Stop the reaction

Question 3

What gas can be used to extinguish fire and how does it extinguish it?

Answer 3

carbon dioxide - it’s heavier than air so it prevents oxygen from getting to the fire - it smothers it

Question 4

What 2 ways does foam extinguish a fire?

Answer 4

primarily smothering, also cooling

Question 5

t/f

water extinguishes primarily by cooling

Answer 5

t

secondary: smothering

Question 6

t/f

carbon dioxide extinguishes a fire primarily by inhibiting the chemical chain reaction

Answer 6

f

it smothers it

Question 7

t/f

Halon extinguishes fire primarily by cooling

Answer 7

f

it breaks the chemical reaction

Question 8

t/f

Dry chemical extinguishes fire primarily by smothering

Answer 8

f

it inhibits the chemical chain reaction

Question 9

t/f

For most substances combustion occurs after the fuel has been vaporized

Answer 9

T

Question 10

Describe a perforated pipe system and it’s drawbacks

Answer 10

Perforated pipes were attached to the ceiling, and each section was fed by a riser and controlled by a gate valve located outside a room or building.

Problems: poor distribution, openings subject to clogging…rust and foreign materials, heavy water damage

Question 11

How was water supplied for the early automatic sprinklers?

Answer 11

elevated tank

Question 12

Who first used the principle of a deflector?

Answer 12

Charles E. Buell

Question 13

Who created the first practical application of automatic sprinkler systems?

Answer 13

Henry Parmelee (and his piano factory)

Question 14

Who is credited with the rapid commercial development of the automatic sprinkler?

Answer 14

Frederick Grinnell

Question 15

Who invented the first automatic sprinkler?

Answer 15

Major Harrison

Question 16

“Old-type” sprinklers were invented when, and what made them different from the previous sprinkler heads?

Answer 16

1921; they used a bulb instead of the metal strut and fusible solder.

Question 17

When did the “standard sprinkler” get it’s name, and what made it better than the old-type?

Answer 17

1958; radically changed pattern of water discharge

Question 18

t/f

The metals used in a 212 degree F solder link all individually nave a melting point greater than 212 degrees F

Answer 18

T

Question 19

t/f

The residential sprinkler operates faster than standard response sprinkler.

Answer 19

T

Question 20

t/f

For many years sprinklers were primarily property protection devices

Answer 20

T

Question 21

t/f

a single water system may supply a number of sprinkler systems

Answer 21

T

Question 22

Define ADD

Answer 22

Actual Delivered Density (the amount of water actually delivered to extinguish the fire)

Question 23

Define RDD

Answer 23

Required Delivered Density (the amount of water needed to extinguish the fire)

Question 24

t/f

sprinklers around escalator openings are spaced closer than sprinklers in the remainder of the occupancy

Answer 24

T

Nfpa 13
9.3.5.1

Question 25

t/f
The speed of operation of sprinklers is related to the height of the sprinklers above the fuel

Answer 25

T

Question 26

t/f

It is an accepted rule of sprinkler protection that the higher the discharge pressure from the sprinklers the better the fire protection that is obtained

Answer 26

F

too much pressure = mist

Question 27

t/f

Sprinkler systems in areas subject to earthquakes must be provided with flexible couplings

Answer 27

T

NFPA 13

18.2.1

Question 28

List examples of light hazard occupancies

Answer 28

apartments, churches, schools, office buildings, hotels, public buildings, dwellings

Question 29

what types of buildings fall in the ordinary hazard class?

Answer 29

ordinary mercantile, manufacturing, and industrial properties

Question 30

List examples of ordinary hazard group 1 buildings

Answer 30

(low combustibility, stockpiles are less than 8 feet)

canneries, laundries, electronic plants

Question 31

List examples of ordinary hazard group 2 buildings

Answer 31

(quantity and combustibility is moderate to high, stockpiles less than 12 feet)

cereal mills, textile plants, printing plants

Question 32

What things classify a high hazard class group 1 occupancy?

Answer 32

severe fire variables that don’t usually involve flammable and combustable liquids

Question 33

t/f

Pipe sizing is affected by the occupancy classification

Answer 33

T

NFPA 13

FIG 19.3.3.1.1