Hydraulics

Question 1

Appliance loss in a ladder pipe

Answer 1

25 psi

Question 2

Cubic foot of water weight

Answer 2

62.5 lbs

Question 3

“Fireground” master steam flows

1 1/4:
1 3/8:
1 1/2
1 3/4
2

Answer 3

400
500
600
800
1000

Question 4

Gallons in a cubic foot

Answer 4

7.5 gallons

Question 5

Fairfax county engines carry how much foam?

Answer 5

40 gallons class B

Question 6

How many feet from the pump must foam eductor be placed?

Answer 6

50 ft

Question 7

How many feet from nozzle must eductor be placed?

Answer 7

Within 200 ft

Question 8

One cubic foot contains how many cubic inches?

Answer 8

1728 cubic inches

Question 9

One cubic foot contains how many gallons?

Answer 9

7.5

Question 10

One cubic foot of fresh water weighs how many pounds?

Answer 10

62.5 pounds

Question 11

One gallon contains how many cubic inches?

Answer 11

231 cubic inches

Question 12

One gallon of fresh water weighs how many pounds?

Answer 12

8.33 pounds

Question 13

One column of 1’ high exerts a pressure of what at its base?

Answer 13

.434 psi

Question 14

A column of 2.304’ high exerts how much pressure at its base?

Answer 14

1 psi ( 1/.434)

Question 15

50’ of 1.75 hose contains how many gallons?

Answer 15

6.24

Question 16

50’ length of 1.88” hose contains how many gallons?

Answer 16

7.2

Question 17

50’ of 2.5” contains how many gallons?

Answer 17

12.74

Question 18

50’ of 3” hose contains how many gallons?

Answer 18

18.35

Question 19

100’ of 4” contains how many gallons?

Answer 19

65.25

Question 20

100’ of 5” contains how many gallons?

Answer 20

101.94

Question 21

What is a primer pump?

Answer 21

A positive displacement pump used to evacuate air from a centrifugal pump house omg allowing the pump to receive water

Question 22

A Siamese does what?

Answer 22

An appliance that turns 2 lines into one

Question 23

A wye is?

Answer 23

An appliance that breaks one hose line into two

Question 24

What is the formula for finding column in a rectangle or square?

Answer 24

L x W x D x 7.5 (number of gallons in a cubic foot)

If using a pool with 3’ shallow and 9’ deep end. Take the average of those and divide by two

3+9/2=6

Question 25

How would you know how many pounds of water were in a rectangular box?mi no

Answer 25

L x W x D = cubic feet Total #of cubic feet x 62.5 (weight of a cubic foot)

Question 26

How do you find the column in a cylinder?

Answer 26

π x R2 x H or L x 7.5

Question 27

What is the formula to find the gpm out of a smooth note?

Answer 27

29. 7 x d2 x square root of NP | 29. 7 is the constant.

Question 28

What’s the square root of 50, 80, 100

Answer 28

7.07 8.94 10

Question 29

What are the tip sizes gpm master and hand line as well as foreground and theoretical?

Answer 29

15/16- 185 1 1/8- 266 & 250 1 1/4- 328 & 325 Above 80psi 1 1/4- 415 & 400 1 3/8- 502 & 500 1 1/2- 598 & 600 1 3/4- 814 & 800 2- 1062 & 1000

Question 30

What does a piercing nozzle flow?

Answer 30

125 gpm at 100 psi

Question 31

What does a deacon shower flow?

Answer 31

270 gpm at 75 psi

Question 32

What can a forestry nozzle flow?

Answer 32

12-60 gpm some 22 gpm at 100psi

Question 33

The 2.5 and 1.5 distributer nozzle flows?

Answer 33

2. 5- 250 gpm at 100psi | 1. 5- 95 gpm at 50psi

Question 34

The 2.5 and 1.5 cellar nozzle flows what?

Answer 34

2. 5- 350 gpm at 100psi | 1. 5- 160 gpm at 100psi

Question 35

What are the four principles of friction loss?

Answer 35

1) double the length of hose and double the friction loss 2) if the flow rate is doubled the friction loss will be 4 times greater 3) when the flow remains constant the friction loss in a hose will decrease when the hose increases 4) friction loss is velocity based meaning the faster you move water the more friction loss you will have

Question 36

What are the friction coefficients?

Answer 36

``` 1”-150 1 3/4- 10 (15.5 per ifsta) 2”- 8 2.5”- 2 3”- .8 4”- .2 5”- .08 ```

Question 37

What are your appliance loss pressures?

Answer 37

``` 350gpm and under- 0 350 gpm and greater- 10 25- ladder pipes 25- master streams 25- standpipes ```

Question 38

A column of water exerts pressure of what psi at a foot high?

Answer 38

.434 psi

Question 39

The JS-10 can be used as variable spray or straight and has to be fully open or closed. And has a NP and gpm of what?

Answer 39

100 gpm and100 psi at the tip

Question 40

The inline foam educator must be how many feet from the pump?

Answer 40

50ft to prevent turbulence from the pump

Question 41

The foam educator is capable of flowing how many gpm

Answer 41

95-125 gpm