TB 7 Fighting Fires with Large Spray Streams

Question 1

The physical differences between spray streams and standard straight streams are: ____

Answer 1

size of the water droplets, shape of the stream and effective reach.

Question 2

Spray Stream Advantages :

____, area of the cooling medium is provided and exposed to the heated atmosphere.

Answer 2

Greater surface

Question 3

Spray Stream Advantages :

Smaller water droplets can more rapidly be converted into vapor (steam), resulting in a_____

Answer 3

reduction of the surrounding oxygen content.

Question 4

Water expands into steam at a ratio of 1 to 1700 with 1 gallon of water capable of producing about __ cubic feet of vapor.

Answer 4

227

Question 5

1 gallon of water absorbs ____ in changing to steam, with only 1250 of these BTU’s being utilized in raising the water temperature from ____.

Answer 5

9330 BTU / 62° to 212° F

Question 6

Disadvantages to Spray Streams :
There is considerably less reach due to “___,” which applies to the friction between air and water as the water travels toward the fire.

Answer 6

skin friction

Question 7

Skin friction also causes entrained air to be directed towards the ___ which may or may not be desirable.

Answer 7

fire