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App Tech > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

how many cubic inches in one cubic foot

A

1728 inches

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2
Q

how many gallons in one cubic foot

A

7.5 gallons

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3
Q

how much does one cubic foot of fresh water weigh

A

62.5 pounds

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4
Q

how many cubic inches in one gallon

A

231 cubic inches

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5
Q

how much does one gallon of fresh water weigh

A

8.33 pounds

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6
Q

how much pressure does a 1 foot column of water exert at its base

A

.434 psi

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7
Q

how much pressure does a 2.304 foot column of water exert at its base

A

1 psi

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8
Q

how many gallons does 50 foot length of 1.75 inch hose contain

A

6.24 gallons

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9
Q

how many gallons does 50 foot length of 1.88 inch hose contain

A

7.2 gallons

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10
Q

how many gallons does 50 foot length of 2.5 inch hose contain

A

12.74 gallons

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11
Q

how many gallons does 50 foot length of 3 inch hose contain

A

18.35 gallons

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12
Q

how many gallons does 100 foot length of 4 inch hose contain

A

65.25 gallons

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13
Q

how many gallons does 100 foot length of 5 inch hose contain

A

101.94 gallons

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14
Q

nozzle pressure for hand lines with smooth bore nozzles

A

50 psi

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15
Q

nozzle pressure for hand lines with smooth bore nozzles for higher flow

A

65 psi

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16
Q

nozzle pressure for master streams with smooth bore nozzles

A

80 psi

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17
Q

nozzle pressure for master streams with smooth bore nozzles for higher flow

A

100 psi

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18
Q

akron assault nozzles are designed for ___ nozzle pressure and flows ___ with the fog nozzle

A

50 psi and 175 gpm

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19
Q

akron assault nozzles are designed for ___ nozzle pressure and flows ___ with the 15/16 inch slug

A

50 psi and 185 gpm

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20
Q

type of pump that takes advantage of incoming water pressure

A

centrifugal

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21
Q

type of pump that water enters the eye and then travels through one or more impellars

A

centrifugal

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22
Q

formula for volume of a rectangular or square shaped container

A

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

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23
Q

formula for volume of a cylinder, pipe, or hose

A

3.14 x r^2 x H (or L) x 7.5 (gallons in a cubic foot of water)

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24
Q

formula for flow from a smooth bore nozzle in gpm

A

gpm = 29.7 x d^2 x (sq. root of NP (nozzle pressure))

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25
Q

theoretical gpm for handline with ___ tip

A 
1/2 inch @ 53 
7/8 inch @ 161 
15/16 inch @ 185
1 inch @ 210 
1 and 1/8 inch @ 266 
1 and 1/4 inch @ 328
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26
Q

fire ground gpm’s for handlines with smoothbore tip

A 
1/2 inch @ 50
7/8 inch @ 150
15/16 inch @ 185
1 inch @ 200
1 and 1/8 inch @ 250
1 and 1/4 inch @ 325
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27
Q

theoretical gpm for master stream with ___ tip

A 
1 and 1/4 inch @ 415
1 and 3/8 inch @ 502
1 and 1/2 inch @ 598
1 and 3/4 inch @ 814
2 inch @ 1062
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28
Q

fireground gpm for master stream with ___ tip

A 
1 and 1/4 inch @ 400
1 and 3/8 inch @ 500
1 and 1/2 inch @ 600
1 and 3/4 inch @ 800
2 inch @ 1000
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29
Q

1 inch adjustable gallonage fog nozzle can flow ___

A

12-60 gpm

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30
Q

1 and 1/2 inch akron assault nozzle flows ___

A

175 gpm

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31
Q

2 and 1/2 inch akron fog nozzle can flow ___

A

125-250 gpm

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32
Q

akron quick attack mercury monitor flows ___

A

500 gpm

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33
Q

master stream fog nozzles can flow ___

A

150-2000 gpm

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34
Q

booster reels are generally what length and diameter

A

150 feet and 1 inch

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35
Q

booster reels generally can flow ___ with ___ nozzle pressure

A

12-60 gpm and 100 psi

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36
Q

forestry hose comes in ___ and ___ sections

A

50 foot and 100 foot

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37
Q

forestry hose with 1 inch adjustable gallonage fog nozzle can flow ___ @ ___ psi

A

12-60 gpm @ 100 psi

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38
Q

forestry hose with red fog nozzle flows ___ @ ___psi

A

22 gpm @ 100 psi

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39
Q

decon showers flow ___ @ ___ psi

A

270 gpm @ 75 psi

40
Q

piercing nozzles flow ___ @ ___ psi

A

125 gpm @ 100 psi

41
Q

2 and 1/2 inch distributor nozzle flows ___ @ ___ psi

A

250 gpm @ 100 psi

42
Q

1 and 1/2 inch distributor nozzle flows ___ @ ___ psi

A

95 gpm @ 50 psi

43
Q

2 and 1/2 inch cellar nozzle flows ___ @ ___ psi

A

350 gpm @ 100 psi

44
Q

1 and 1/2 inch cellar nozzle flows ___ @ ___ psi

A

160 gpm @ 100 psi

45
Q

fixed monitor with smooth bore break away nozzle has what ___ tip with ___ flow @ ___ psi

A

1 and 3/8 inch flows 500 gpm @ 110 psi
1 and 1/2 inch flows 600 gpm @ 110 psi
1 and 3/4 inch flows 800 gpm @ 110 psi
2 inch flows 1000 gpm @ 120 psi

46
Q

fixed monitor with task force tip automatic nozzle flows ___ @ ___ psi

A

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

47
Q

fixed monitor with akron adjustable flow nozzle flows ___ @ ___ psi

A

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

48
Q

fairfax county uses the ___ as its portable monitor

A

akron quick attack mercury monitor

49
Q

akron quick attack monitor with smoothbore has ___ tip with ___ nozzle pressure

A

1 and 3/8 inch and 80 psi

50
Q

akron quick attack monitor with fog nozzle requires ___ nozzle pressure

A

100 psi

51
Q

akron quick attack monitor should use what size hose to supply

A

3 inch

52
Q

maximum inlet pressure for akron quick attack monitor

A

150 psi

53
Q

appliance loss for akron quick attack monitor

A

10 psi

54
Q

combination monitor with smooth bore nozzle can flow ___ @ ___ nozzle pressure

A

500-1000 gpm @ 80 psi

55
Q

combination monitor with fog nozzle can flow ___ @ ___ nozzle pressure

A

350-1250 @ 100 psi

56
Q

1st principle of friction loss

A

double the length of hose, doubles the friction loss

57
Q

2nd principle of friction loss

A

if flow rate is doubled then friction loss will be 4 times greater

58
Q

3rd principle of friction loss

A

friction loss varies inversely to the fifth power as the diameter of the hose

friction loss decreases with increase in diameter of hose

59
Q

4th principle of friction loss

A

higher velocity to move same amount of water through smaller diameter hose

increasing pump pressure will overcome friction loss to have correct nozzle pressure

60
Q

friction loss coefficients

A 
1 inch = 150
1 and 3/4 inch = 10 
2 inch = 8
2 and 1/2 inch = 2
3 inch = .8
3 and 1/2 inch = .34
4 inch = .2
5 inch = .08
61
Q

formula for friction loss

A

FL = C x Q^2 x L

62
Q

at what gpm do you need to add 10 psi for appliance loss

A

350 gpm

63
Q

what appliances do you add 25 psi

A

ladder pipes
master streams except monitor
standpipes

64
Q

how many psi for elevation pressure do you add per 10 feet of height up

A

4.34

65
Q

what is the minimum safe pdp during normal operations

A

250 psi

66
Q

national foam js10 air aspirating nozzle is rated for ___ @ ___ psi

A

100 gpm @ 100 psi

67
Q

fairfax county portable foam eductors flow ___ gpm with pressure of ___ psi at the eductor

A

95 to 125 gpm @ 200 psi

68
Q

foam eductor must be placed ___ feet from the pump panel and within ___ feet of the nozzle

A

50 feet and 200 feet

69
Q

when flowing foam, nozzle should be no more than ___ feet above the eductor

A

5 feet

70
Q

what type of foam system is the akron truck mount

A

bypass proportioning system

71
Q

what type of foam system is the waters around the pump proportioner

A

around the pump system

72
Q

what psi to pump inline educator at

A

200 psi

73
Q

what type of foam system is the husky foam system

A

electronic direct injection foam system

74
Q

what psi for electronic direct inject foam system

A

150 psi

75
Q

minimum gallons of foam on Fairfax County pumper

A

40 gallons

76
Q

which Fairfax County pumpers are equipped with cafs

A

412, 416, 420, 441

77
Q

what is the breakdown of cafs for fire attack

A

2/3 water and 1/3 air with a foam application rate of .3%

78
Q

what is breakdown of cafs for overhaul

A

2/3 air and 1/3 water with a foam application rate of .5%

79
Q

for cafs, amount of water needed to create and effective stream is decreased by ___ %

A

25%

80
Q

Fairfax County cafs pumpers can flow foam from which 5 discharges

A

leader line
blitz line
both cross lays
bumper lines

81
Q

how long can cafs air compressor be operated without overheating

A

2 hours

82
Q

pierce recommends that cafs only be used for lines up to ___ feet in length

A

250 feet

83
Q

minimum starting pressure for 4 inch supply lines in relay operations

A

50 psi

84
Q

minimum starting pressure for 3 inch supply lines in relay operations

A

100 psi

85
Q

minimum starting pressure for combination of 3 and 4 in supply line in relay operations

A

100 psi

86
Q

formula for pump discharge in relay ops

A

PDP = RP+TPL

87
Q

formula to calculate proper pressure for maximum flow

A

static hydrant pressure + 150 psi

88
Q

friction loss for multiple supply lines

A

two 3 inch lines = .2
one 4 inch line and one 3 inch line = .09
two 4 inch lines = .05

89
Q

calculating available water from hydrant

A

percentage drop = (SP-RP) 100 / SP

90
Q

initial pressure for standpipe

A

150 psi

91
Q

what goes into calculating pdp for standpipes

A 
nozzle pressure
friction loss in attack line
25 psi for appliance loss in standpipe
friction loss in supply to fdc
height of attack line above pumper
92
Q

starting pdp for sprinkler systems

A

150 psi

93
Q

starting pdp for combination standpipe and sprinkler systems

A

150 psi

94
Q

elevated master streams need these 4 factors to determine correct pdp for aerial device

A

nozzle pressure
25 psi for appliance loss in aerial device
elevation pressure ( nozzle height)
friction loss in hose between pumper and aerial device

95
Q

starting pressure for all aerial devices

A

150 psi

96
Q

smooth bore nozzle reaction formula

A

NR = 1.57 x d^2 x NP

97
Q

fog stream nozzle reaction formula

A

.0505 x Q x sq root NP

App Tech (11 decks)

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