Hydraulics Theory

Question 1

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

Answer 1

7.20

Question 2

50’ length of 2.5” hose contains how many gallons of water?

Answer 2

12.74

Question 3

50’ length of 3” hose contains how many gallons of water?

Answer 3

18.35

Question 4

100 ‘ length of 4” hose contains how many gallons of water?

Answer 4

65.25

Question 5

What is the pressure of the handline smooth bore nozzle?

Answer 5

50 psi (65 psi can be used for higher pressure)

Question 6

What is the nozzle pressure for the master stream smooth bore?

Answer 6

80 psi (100 psi can be used to achieve higher flow)

Question 7

For each foot of elevation above the pump. The pressure increase by how many psi?

Answer 7

0.434 psi

Question 8

A master stream delivers more than how many gallons?

Answer 8

350 gallons

Question 9

Formula for a rectangle or square

Answer 9

L’ x W’ x D’ x 7.5

Question 10

1/2” tip size for handline gpm flow.

Answer 10

Fire Ground = 50
Theoretical = 53

Question 11

7/8” tip size for handline gpm flow.

Answer 11

Fire Ground = 150
Theoretical = 161

Question 12

15/16” tip size for handline gpm flow.

Answer 12

Fire Ground = 185
Theoretical= 185

Question 13

1” tip size for handline gpm flow.

Answer 13

Fire Ground = 200
Theoretical = 210

Question 14

1 1/8” tip size for handline gpm flow.

Answer 14

Fire Ground = 250
Theoretical = 266

Question 15

1 1/4” tip size for handline gpm flow.

Answer 15

Fire Ground = 325
Theoretical = 328

Question 16

1 1/4” tip size for master stream gpm flow.

Answer 16

Fire Ground = 400
Theoretical = 415

Question 17

1 3/8” tip size for master stream gpm flow.

Answer 17

Fire Ground = 500
Theoretical = 502

Question 18

1 1/2” tip size for master stream gpm flow.

Answer 18

Fire Ground = 600
Theoretical = 598

Question 19

1 3/4” tip size for master stream gpm flow.

Answer 19

Theoretical = 814
Fire Ground = 800

Question 20

2” tip size for master stream gpm flow.

Answer 20

Fire Ground = 1000
Theoretical = 1062

Question 21

The 1 1/2” Akron Assault nozzle flows how many gallons per minute?

Answer 21

175 gpm

Question 22

The 2 1/2” Akron fog nozzle is and adjustable flow nozzle that can flow how many gpm?

Answer 22

125-250 gpm

Question 23

The Akron mercury monitor flows how many gpm?

Answer 23

500 gpm

Question 24

Master stream fog nozzles have an operating range of how many gpm?

Answer 24

150-2000gpm

Question 25

Booster reel lines are usually how many feet long?

Answer 25

150’

Question 26

Booster line adjustable fog nozzle can flow between how many gpm at what nozzle pressure.

Answer 26

12-60 gpm @ 100 psi nozzle pressure

Question 27

Forestry hoses come in what size sections?

Answer 27

50’ and 100’

Question 28

1” adjustable fog nozzle flows how many gpm’s? What is the nozzle pressure?

Answer 28

Between 12-60 gpm. 100 psi

Question 29

Decontamination showers flow how many gpm at what psi?

Answer 29

270 gpm at 75 psi

Question 30

Penetrating nozzles flow how many gpm at what psi?

Answer 30

125 gpm at 100 psi

Question 31

The 2 1/2” distributor nozzle flows how many gpms at what psi?

Answer 31

250 gpm at 100 psi

Question 32

The 1 1/2” distributor nozzle flows how many gpm at what psi?

Answer 32

95 gpm at 50 psi

Question 33

The 2 1/2 cellar nozzle flows how many gpm at what psi?

Answer 33

350 gpm at 100 psi

Question 34

The 1 1/2” cellar nozzle flows how many gpm at what psi?

Answer 34

160 gpm at 100 psi

Question 35

At what pressure are the 1 3/8”, 1 1/2”, 1 3/4” tips on the fixed smooth bore monitor flowed?

Answer 35

110 psi

Question 36

At what pressure is the 2” tip on the fixed smooth bore monitor flowed?

Answer 36

120 psi

Question 37

What are the flow and pressure settings for the task force tip automatic nozzle on the fixed monitor?

Answer 37

500 gpm - 90 psi 750 gpm - 110psi 1000 gpm - 120 psi 1250 gpm - 140 psi

Question 38

What are the flow setting and pressure for the Akron adjustable flow fixed monitor nozzle?

Answer 38

500 gpm - 100 psi 750 gpm - 110 psi 1000 gpm - 130 psi 1250 gpm - 140 psi

Question 39

What is the maximum inlet pressure for the Mercury Monitor?

Answer 39

150 psi

Question 40

What are the friction loss coefficients for FCFRD hose sizes?

Answer 40

1” - 150 1 3/4” - 10 2” - 8 2 1/2” - 2 3” - 0.8 3 1/2” - 0.34 4” - 0.2 5” - 0.08 Two 3” - 0.2 4”, 3” - 0.09 Two 4” - 0.05

Question 41

What is the friction loss of ladder pipes?

Answer 41

25 psi

Question 42

What is the friction loss of master streams?

Answer 42

25 psi

Question 43

What is the friction loss of standpipes?

Answer 43

25 psi

Question 44

What is the friction loss of gated wye?

Answer 44

10 psi (flowing over 350 gpm)

Question 45

What is the friction loss for elevation?

Answer 45

5 psi for every 10’ or floor

Question 46

What is the gpm and psi rating of the js-10?

Answer 46

100 gpm at 100 psi

Question 47

What is the flow rate of the foam eductor?

Answer 47

95-125 gpm

Question 48

What PDP must you have at the foam eductor?

Answer 48

200 psi

Question 49

The foam eductor must be placed _____ from the pump panel and within _____ of the nozzle.

Answer 49

50’ and 200’

Question 50

Fairfax County engines carry a minimum of how many gallons of foam?

Answer 50

40

Question 51

Pierce recommends that CAFS only be used in lines up to how many feet in length for maximum effectiveness?

Answer 51

250’

Question 52

Fairfax County CAFS hold how many gallons of water and foam?

Answer 52

750 gallons of water 40 gallons of class A foam 40 gallons of class B foam

Question 53

4” supply lines should be charged initially to what psi?

Answer 53

50 psi

Question 54

All 3” supply lines should be charged to a minimum starting pressure of how many psi?

Answer 54

100 psi

Question 55

All 4” and 3” supply lines used together should be charged to a minimum starting pressure of how many psi?

Answer 55

100 psi

Question 56

Fairfax County pumps are rated at ______ gpm at ____ psi pressure

Answer 56

1500 gpm, 150 psi

Question 57

Standpipes should be charged to what initial starting pressure?

Answer 57

150 psi

Question 58

Starting pressure for a sprinkler system is what psi?

Answer 58

150 psi

Question 59

Starting pressure for a combination system is what psi?

Answer 59

150 psi