Ch4 Hoseline Selection, Stretching, and Placement

Question 1

Heat produced by 1lb of wrapping paper

Answer 1

7,100 Btu

Question 2

Heat produced by 1lb of styrene foam

Answer 2

18,000 Btu

Question 3

Practical max flow rates for 1 1/2”, 1 3/4”, 2”, and 2 1/2” hose

Answer 3

1 1/2” = 125gpm
1 3/4” = 180gpm
2” = 225gpm
2 1/2” = 325gpm

Question 4

Rule of thumb for estimating amount of hose needed inside large building

Answer 4

Length+Width (of building), plus one length of hose for each floor above or below level of fire…available AT THE DOOR

Question 5

Max number of hoselines per stairwell

Answer 5

2

Question 6

Stretch hose on outside of the building if the fire is on the ___ floor or higher

Answer 6

Fourth

Question 7

Three priorities for hoseline positioning

Answer 7

• Protect human life
• Confine the fire
• Extinguish the fire

Question 8

The greatest protection from radiant heat

Answer 8

Distance

Question 9

Functions of the nozzle (3)

Answer 9

• Regulate the amount of water
• Increase the velocity of the water
• Give the stream shape

Question 10

Two main types of fog nozzles

Answer 10

• Constant pressure

- Constant gallonage

Question 11

Hole size needed for cellar nozzle or distributor

Answer 11

10” x 10”

Question 12

Gate valve placement for cellar nozzle or distributor

Answer 12

One hose length back from device

Question 13

Reach of cellar nozzle

Answer 13

50’ or more

Question 14

Reach of distributor

Answer 14

Only 15-20’

Question 15

Expansion ratio of high-ex foam

Answer 15

400:1 - 1000:1

Question 16

What circumstances must be in place to enter high-ex foam blanket (5)

Answer 16

• Entry is for life saving purposes or fire containment
• All members are properly equipped
• Electricity is shut off
• RIT on standby at point of entry
• Charged hoseline

Question 17

Basic components of CAFS system (3)

Answer 17

• Foam concentrate supply
• Injection device to deliver concentrate to water stream
• Source of compressed air to be injected into foam/water solution

Question 18

Foam expansion ratio created by fog nozzles

Answer 18

2:1 or 3:1

Question 19

Foam expansion ratio created by air-aspirating nozzles

Answer 19

7:1 or 10:1

Question 20

Proportion used for Class A foam

Answer 20

0.3 - 0.6%

Question 21

Proportion used for Class B foam

Answer 21

3-6%