T.B. 7 Large spray

Question 1

What are the physical differences b/t spray streams (3 items)

Answer 1

1. size
2. shape
3. effective reach

Question 2

Advantages of spray steams?

Answer 2

1. Greater surface area for cooling
2. Efficient water use (less damage)
3. Small droplets evaporate for vaper steam (less O²)
4. Sheilding personel from radient heat
5. Greater coverage of are (cone/wide angle)
6. Handlines can be easily managed with more GPM
7. More efective of liquid and eectrcal fires

Question 3

TB7 Water expansions rate

Answer 3

1 - 1700

1 gal. water = 227cu. ft vapor

absorbs 9330 BTU

Question 4

TB7

Disadvantages for Spray streams?

(6items)

Answer 4

1. less reach due to skin friction
2. Skin friction can introduce air
3. smaller water droplets can’t reach seat
4. smaller droplets affected by wind/air
5. can’t effectively provide large volume with good reach
6. operations in confined space may make it untenable (steam)