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Backup Engine Driver > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

Coefficient for 1.88” hoseline

A

10

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2
Q

Coefficient for 2.5” hoseline

A

2

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3
Q

Coefficient for 3” hoseline

A

.8 (1)

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4
Q

Coefficient for 4” hoseline

A

.2

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5
Q

Coefficient for 5” hoseline

A

.08

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6
Q

A column of water 1’ high exerts a pressure of ______ at its base

A

.434

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7
Q

100 feet of 4” contains how much water?

A

65.25

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8
Q

50 feet of 3” contains how much water?

A

18.35

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9
Q

50 feet of 2.5” contains how much water?

A

12.74

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10
Q

50 feet 1.88” contains how much water?

A

7.20

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11
Q

Nozzle pressure for ALL smooth bore handlines. What can it be increased to?

A

50psi, 65psi

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12
Q

Nozzle pressure for master streams with a smooth bore? What can they be increased to?

A

80psi, 100psi

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13
Q

Nozzle pressure for all master streams with a fog nozzle?

A

100psi

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14
Q

water pressure due to elevation. For each foot of elevation above the
pump the pressure increases by 0.434 psi

A

Head pressure

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15
Q

the generic term applied to any nozzle, wye, siamese, deluge monitor, or any
other piece of hardware used in conjunction with fire hose for the purpose of delivering
water.

A

Appliance

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16
Q

pumps used on all modern fire apparatus. This type of pump takes
advantage of incoming pressure. Water enters the eye of the pump then travels through
one or more impellers.

A

Centrifugal pumps

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17
Q

small positive displacement pump used to evacuate air from a centrifugal
pump housing allowing the pump to receive water.

A

Primer pumps

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18
Q

The formula for determining volume for a rectangular or square shaped container is

A

L’ x W’ x D’ x 7.5

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19
Q

The formula to determine the volume of a cylinder, pipe, or hose in gallons is

A

π x r (squared) x H’ (or L’) x 7.5 gallons

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20
Q

Smooth Bore nozzle discharge formula?

A

gpm = 29.7 x d2x (square root) NP

21
Q

Master Stream 2” tip GPM

A

1062 (1000)

22
Q

Master Stream 1 3/4” tip GPM

A

814 (800)

23
Q

Master Stream 1 1/2” tip GPM

A

598 (600)

24
Q

Master Stream 1 1/4” tip GPM

A

415 (400)

25
Q

Master stream 1 3/8” tip gpm

A

502 (500)

26
Q

Decon Shower GPM’s and pressure

A

270gpm at 75psi

27
Q

Piercing Nozzle GPM’s and pressure

A

125gpm at 100psi

28
Q

1 3/4” coefficient

A

15.5

29
Q

1” coefficent

A

150

30
Q

2” coefficent

A

8

31
Q

The National Foam JS-10 air aspirating nozzle has a rating of ____ gpm at ____ psi at the tip

A

100gpm, 100psi at the tip

32
Q

Fairfax County Portable Foam Eductor’s flow _____-____ gpm with a pump discharge pressure of _____psi at the eductor

A

95-100gpm, 200psi at the eductor

33
Q

Pierce Pumpers equipped with the Husky Foam system. It is capable of injecting foam from ____-____% with a rated capacity of ___gpm of foam concentrate at 150 psi

A

.1-3%, 3gpm of foam @150 psi

34
Q

dual 3” coefficient

A

.2 (same as single 4”)

35
Q

dual 4” coefficient

A

.05

36
Q

one 3” and one 4” coefficient

A

.09

37
Q

Starting PDP for sprinkler systems is

A

150psi

38
Q

Starting PDP for combination systems is

A

150psi

39
Q

Starting PDP for aerial master streams is

A

150 psi

40
Q

Nozzle Reaction for smooth bore nozzles

A

NR = 1.57 x d2 x NP

41
Q

Nozzle reaction for fog nozzle

A

NR = .0505 x Q x √NP

42
Q

What do you throttle up to when drafting?

A

1000-1200gpm

43
Q

What must you do before attempting to draft?

A

make sure everything is closed!!!!

44
Q

The 2½” distributer nozzle flows ____gpm at ____psi

A

250gpm at 100psi

45
Q

The 1½” distributer nozzle flows ____gpm at ____psi

A

95gpm at 50psi

46
Q

The 2½” cellar nozzle flows ____gpm at ____psi

A

350gpm at 100psi

47
Q

The 1½” cellar nozzle flows ____gpm at ____psi

A

160gpm at 100psi

48
Q
A

Backup Engine Driver (2 decks)

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