Hydraulics Flashcards Preview

2018 App Test > Hydraulics > Flashcards

Flashcards in Hydraulics Deck (79):
1

Hydraulics is the study of what?

Fluids at rest and in motion

2

Q

Flow divided by 100

3

SP

Static pressure

4

TPL

Total pressure loss

5

1 cubic foot contains how many cubic inches?

1728

6

1 cubic foot = how many gallons

7.5

7

1 cubic foot of fresh water weighs how many pounds

62.5

8

1 gallon contains how many square inches

231

9

1 gallon of fresh water weighs how many pounds

8.33

10

A column of water 1 foot high exerts a pressure of what at the base

.434

11

1 psi at the base = how high a column of water

2.304

12

50 ft of 1.75 hose contains how much water

6.24

13

50 ft of 2.5 hose contains how much water

12.74 gallons

14

50 ft of 3”hose contains how much water

18.35 gallons

15

100 ft of 4”hose contains how much water

65.25 gallons

16

100 ft of 5”hose contains how much water

101.94 gallons

17

Hand lines for smooth bore nozzles are_____, but can be increased to ____ to achieve a higher flow?

50 psi, 65 psi

18

Master streams for smooth bore nozzles are_____, but can be increased to ____ to achieve a higher flow?

80 psi, 100 psi

19

Akron assault nozzles are_____ for fog with a flow of____

50 psi, 175 Gomez

20

Akron assault nozzles are_____ for slug with 15/16” slug with a flow of____

50 psi, 185 gum

21

Nozzle pressure for all other fog nozzles is____

100 psi

22

What type of pump is used on all modern fire apparatus?

Centrifugal pumps. Takes advantage of incoming pressure. It enters the eye and travels through the impeller(s)

23

Discharge velocity

The rate at which water travels from an orifice and can be measured using a pitot gauge

24

Gutter line

Line run directly from a hydrant to an attack pumper

25

Head pressure

Water pressure due to elevation(.434 psi/foot)

26

Elevated stream

Master stream nozzle attached to or being operated from an aerial ladder

27

Ladder pipe

Master stream nozzle mounted to the fly of an aerial ladder

28

Master stream is

Delivery of 350gpm or more

29

Siamese

An appliance that combines 2 or more hose lines into 1

30

Static pressure

The pressure exerted by water at rest in a confined vessel available to force the water through pipe, hose, etc

31

Residual pressure

Pressure remaining in a water system when water is flowing

32

Water hammer

The force created by the rapid deceleration of water usually by opening or closing valve too quickly

33

Wye

An appliance that breaks one hose line into one female and at least one or more males

34

Formula for determining volume for a rectangular container in gallons

L x w x d x 7.5(number of gallons in a cubic foot)

35

How to calculate weight of water on a roof?

L x w x d x 62.5 lbs

36

How to calculate volume of a cylinder?

Pi (3.14) x r (squared) x h ( or l) x 7.5 (gallons)

37

Smooth bore nozzle discharge calculation

29.7 x d (squared) x the square root of the nozzle pressure

38

Hand line @ 50 psi tip sizes with theoretical calculations

1/2”- 53
7/8”-161
15/16-185
1”-210
1 1/8”- 266
1 1/4”-328

39

Hand lines at 50 psi tips and gum for fire ground calculations

1/2”- 50
7/8”-150
15/16-185
1”-200
1 1/8”- 250
1 1/4”-325

40

Master stream tips at 80 psi

Theoretical Fireground
1 1/4”- 415. 400
1 3/8”- 502. 500
1 1/2 - 598. 600
1 3/4- 814. 800
2” - 1062. 1000

41

How much flow can a 1” adjustable gallonage fog nozzle be set to

12-60gpm

42

Master stream fog nozzles have an operating range of what

150-2000gpm

43

How long are booster reels normally and what psi nozzle with what flow?

150’, adjustable gallonage fog with 100psi nozzle and flow between 12-60gpm

44

What types of nozzles can be on 1” forestry hose?

1” adjustable gallonage fog nozzle or the 23gpm red fog nozzle both at 100 psi

45

Decon showers flow what at what psi?

270 gpm at 75 psi

46

Piercing nozzles are for what and flow what?

Aka, penetrating nozzles are for inaccessible areas such as voids and attics. They flow 125 gpm at 100 psi

47

Cellar nozzle use and flow

Aka distributor nozzle -For basement and attic fires
Distributers *********************. 2 1/2” flows 250 gpm at 100psi
1 1/2” flows 95 gpm at 50psi
Cellar nozzle *********************
2 1/2” flows 350 gpm at 100psi
1 1/2” flows 16 gpm at 100psi

48

Task force tip automatic nozzle flows and pressures

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

49

Akron adjustable flow nozzle flows and pressure

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

50

Akron quick attack mercury monitor flows what and pressured at what with fog and smooth bore

500 gpm with 1 3/8 tip at 80 psi np
500gpm with fog at 100 psi

51

Mercury monitor appliance loss

10psi

52

Preferred method to supply a mercury monitor

Single 3” supply hose with maximum inlet pressure of 150psi

53

Common causes of friction loss

Kinks(bends in hose); nozzles; appliances; protruding gaskets in the couplings; delaminating hose; pump piping; and diameter restrictions

54

1st principle of friction loss

All variables being the same, friction loss will vary directly with the length of the hose or pipe

55

2nd principle of friction loss

Friction loss varies approximately with the square of the increase in the velocity of the flow. If the flow rate is doubled, the friction loss will be four times greater

56

3rd principle of friction loss

When flow remains constant, friction loss will decrease as diameter of hose increases

57

4th principle of friction loss

For any given flow velocity, friction loss is independent of pressure. The velocity of water through a hose line, not pressure, causes friction loss

58

Friction loss coefficients

1”= 150
1 3/4= 10 for Fairfax (15.5 per IFSTA)
2”= 8
2.5”= 2
3”= .8
3.5”= .34
4”= .2
5”= .08

59

Appliance loss for ladder pipe

25psi

60

Appliance loss for standpipes

25 psi

61

Appliance loss for master stream

25psi

62

Appliance loss for over 350 gpm

10 psi

63

Appliance loss for less than 350 gpm

0

64

Fire ground operations elevation calculation

5 psi for every 10 feet

65

For true elevation calculations, how many psi for every 10 feet?

4.34

66

What is the maximum safe PDP?

250 psi

67

What is the flow/pressure rating for a national foam JS-10 air aspirating nozzle?

100gpm/ 100 psi at the tip
Bale must be fully closed/open to operate properly

68

What is the flow/ pressure for the Fairfax County portable foam eductor?

95-125 at 200 psi
Eductor must be placed 50’ from pump panel and 200’ of the nozzle (as well as no higher than 5 feet)

69

What is the husky foam system?

Electronic direct injection foam system that injects foam to front bumper line from .1-3%. Capacity to flow 3 gpm of foam concentrate at 150psi

70

CAFS engines in Fairfax county

16,20,41,39,32

71

Formula for finding the total gallons of a pool with different depth.

Capacity= L'xW'x Average Depth'x7.5gal/CuFt

Average depth is depth changes divided by amount. IE 3feet in the shallow end 9 ft in the deep end
C=LxWx({3+9}/2)x7.5

72

How to figure out weight of water on an Square or rectangular object?

Weight= LxWxH/D=Cubic FTx62.5 Pounds per cubic ft.

73

What is the max gpm at a draft per the manual for the side intake?

1750

74

Best way to maximize gpm out of a hydrant?

Fully dress it, add 2 gates with 4inch storz

75

Maximum gpm per the manual at a draft fir rear intake?

1500-1750gpm

76

Why is the front intake the lowest rated gpm at a draft? What is the gpm?

Due to pipe bends and 900gpm

77

Nozzle reaction formula?

Sb nozzle reaction = 1.57xd2xNP

78

What is the RPM range for Drafting?

1000-1200rpm

79

Nozzle reaction for fog nozzle?

Fog nozzle reaction =.0505xQxSquareroot np