Hydraulics Handout

Question 1

How would one determine Surface area of a circle

A. 758.2 x Diameter
B. .7854 x Diameter Squared
C. 5471 x Diameter Squared
D. .7857 x Diameter Squared

Answer 1

B. .7854 x Diameter Squared

Question 2

How much does a gallon of water weigh?

Answer 2

8.3 pounds

Question 3

How many gallons in a cubic foot of water?

Answer 3

7.5 gallons

Question 4

In elevation pressure what is the equation for finding height when pressure is known?

Answer 4

2.3 x pressure

Question 5

What is the PSI for a hi-rise fog nozzle?

Answer 5

75 psi

Question 6

What solid stream tips does GFD utilize?

Answer 6

1 3/8”
1 1/2”
1 3/4”
2”

Question 7

GPM flow for 2 1/2 fog

Answer 7

250 GPM

Question 8

GPM for 1 3/4 High-rise

Answer 8

125 GPM

Question 9

What is the intake pressure of water when no water is flowing?

A. Residual
B. Static
C. Flow

Answer 9

B. Static

Question 10

What is the intake pressure of water after flowing water out of pump?

A. Residual
B. Static
C. Flow

Answer 10

A.Residual

Question 11

What is the pressure of water when in motion or flowing through from pump?

A. Residual
B. Static
C. Flow

Answer 11

C. Flow

Question 12

GPM flow of a 1 7/8 solid stream tip

Answer 12

900 GPM flow approx.

Question 13

How much GPM does a Hi-rise solid stream tip with 60psi nozzle pressure flow?

Answer 13

200 GPM flow approx.

Question 14

1 1/2 coefficient

Answer 14

24

Question 15

What is the pressure loss for a Stang gun?

A. 20 PSI
B. 40 PSI
C. 25 PSI
D. 35 PSI

Answer 15

C. 25psi

Question 16

What is the maximum PSI we can flow through 4” rubber jacketed supply line?

Answer 16

185 PSI

Question 17

What is the GPM of a 1” solid stream H/L nozzle?

Answer 17

200GPM

Question 18

What is the GPM of a Foam eductor ?

Answer 18

95GPM

Question 19

On the discharge outlet of a Foam Eductor do not exceed ___ percent of eductor pump pressure with hose friction loss, nozzle pressure and elevation.

Answer 19

70 percent

Question 20

1.85x1.85=

Answer 20

3.5

Question 21

PDP of GFD standard HZ standpipe?

Answer 21

129 PSI

Question 22

PSI of GFD 200’ 2 1/2” hand line

Answer 22

125 PSI

Question 23

GPM of 1 7/8” M/S

Answer 23

900

Question 24

2 1/2” @ 350GPM

Answer 24

24.5 per

Question 25

185 GPM HR S/S 150’

Answer 25

125 psi

Question 26

210 GPM HR S/S 150’

Answer 26

162.5 psi

Question 27

Tip for 13 psi FL per 100’

Answer 27

1 3/4”

Question 28

2 1/2” @ 275GPM

Answer 28

15 per

Question 29

Master 1 1/4” GPM & FL per 100’

Answer 29

400GPM 3 per 100’

Question 30

Master stream 16psi per 100’ tip & GPM

Answer 30

1 7/8” 900GPM

Question 31

2 1/2” 7psi FL per 100’ = GPM

Answer 31

185GPM

Question 32

All Master stream tip sizes

Answer 32

1 1/4"
1 3/8" 
1 1/2"
1 5/8"
1 3/4"
1 7/8"
2"

Question 33

All S/S H/L tips

Answer 33

1” - 200
1 1/8” - 250
1 1/4” - 300

Question 34

60psi HR S/S

Answer 34

200GPM 150’ 150 psi

Question 35

add 10 psi to wye if:

Answer 35

total gpm exceeds 350

Question 36

Master stream 7psi per 100’ tip & GPM

Answer 36

1 1/2” 600gpm