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Engineers Test > Hydraulics > Flashcards

Hydraulics Flashcards

0
Q

What is 70% capacity of the pump

A

200 p.s.i.

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1
Q

What is 100% capacity of the pump?

A

150 p.s.i.

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2
Q

What is 50% capacity of the pump?

A

250 p.s.i.

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3
Q

What is the G.P.M. for smooth bore nozzles on the monitor?

A 
1 1/4 = 400 gpm
1 1/2 = 600 gpm
1 3/4 = 800 gpm
2 = 1000 gpm
1 3/8 = 500 gpm
1 5/8 = 700 gpm
1 7/8 = 900 gpm
take the first number of the fraction and add 2
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4
Q

What is head pressure per foot

A

.434 psi

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5
Q

What is head pressure per floor

A

5 psi

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6
Q

1 lb of water will rise?

A

2.304 feet when 1 psi is applied. at atmospheric pressure (14.7 psi) it will rise 33.86 feet

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7
Q

Gallons per cubic foot

A

7.48 gallons

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8
Q

pounds per cubic foot

A

62.5

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9
Q

pounds per gallon

A

8.33 pounds

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10
Q

cubic inches per gallon

A

231 cubic inches

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11
Q

Stand pipe friction loss

A

25 psi

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12
Q

Monitor friction loss

A

15 psi

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13
Q

4 way valve friction loss

A

15 psi

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14
Q

wye or siamese friction loss

A

0 psi

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15
Q

volume of rectangle

A

C = LWH x 7.5

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16
Q

volume of cylinder

A

C = 6 times D squared times H

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17
Q

Weight of cylinder

A

W = 6 times D squared times H times 8.33

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18
Q

Weight of rectangle

A

W = LWH times 62.5

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19
Q

Calculate GPM

A

29.71 times d squared times the square root of p = GPM

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20
Q

Calculate friction loss

A

2 times Q squared plus Q

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21
Q

Relay Pumping

A

EP = FL + 20 not to exceed 200 psi

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22
Q

Initial Operating Pressure

A

130 psi

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23
Q

Sprinkler System/FDC Operating Pressure

A

150 psi

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24
Q

Calculate Friction Loss Below 100 gpm flowing

A

2Q squared + 1/2Q

25
Q

Handheld Fog nozzle pressure

A

100 psi

26
Q

Handheld smooth bore nozzle pressure

A

50 psi

27
Q

Master stream fog nozzle pressure

A

100 psi

28
Q

Master stream smooth bore nozzle pressure

A

80 psi

29
Q

FL factor for 4 inch hose

A

.25

30
Q

FL factor for 1 3/4 inch hose

A

2

31
Q

FL factor for 1 1/2 inch hose

A

4

32
Q

FL factor for 1 inch hose

A

11

33
Q

FL factor for 3/4 inch hose

A

24

34
Q

Available hydrant flow with less than 10% drop on compound gauge

A

3 like gpm lines

35
Q

Available hydrant flow with between 11 and 15% drop on compound gauge

A

2 like gpm lines

36
Q

Available hydrant flow with between 16 to 25% drop on compound gauge

A

1 like gpm line

37
Q

GPM for handheld smooth bore nozzles

A

1 inch = 200 gpm
1 1/8 inch = 250 gpm
1 1/4 inch = 325 gpm

38
Q

What is max theoretical lift in regards to drafting

A

The distance 1 psi will raise 1 pound of water at any given elevation. 2.304 feet times atmospheric pressure (at sea level max lift is 33.86)

39
Q

What is practical lift in regards to drafting

A

2/3 the height of max theoretical lift, which turns out to be roughly 22’

40
Q

What is the nozzle pressure of the TFT Automatic nozzle on truck 11?

A

80 psi

41
Q

What is the formula for smooth bore nozzle reaction?

A

NR = 1.57 times diameter squared times NP

42
Q

What is the formula for automatic nozzle reaction?

A

NR = .0505 times diameter squared times the square root of NP

43
Q

What is the definition of elevation?

A

The height of discharge relative to the eye of the pump

44
Q

What is a BTU

A

The amount of heat required to raise the temperature of 1 pound of water 1 degree F

45
Q

What are the 5 characteristic of water?

A

Absorbs heat, no tensile strength, incompressible, readily available, non toxic

46
Q

When pumping the truck, how many supply lines are used?

A

3, 2 1/2 lines

47
Q

How many GPM’s is the trucks master stream

A

1000-1250 gpm

48
Q

What is the maximum distance one type 1 engine can supply three lines to the truck?

A

500 feet

49
Q

What is the FL on the Ladder Trucks Trimese?

A

25 psi

50
Q

How is friction loss calculated in the ladder pipe on truck 11

A

.5 psi per foot of elevation above the turntable. Max FL fully extended would be 50 psi

51
Q

What are the 2 different options for pumping the truck

A

Option 1 - engine lays lines to and from the truck, sits at the hydrant and makes all calculations from the engine to the tip of the ladder pipe to achieve the desired gpm.
Option 2 - engine lays lines to and from the truck, sits at the hydrant and relay pumps to the truck (FL + 20 psi) and the truck engineer pumps from the truck panel to the tip.

52
Q

What is latent heat of vaporization

A

The amount of additional heat energy required to convert one pound of water, at its boiling point, to vapor. For water it’s 970 btu’s

53
Q

When pumping from the tank and charging the line, what should the ff be told

A

He is on tank water only

54
Q

What is dependable lift in regards to drafting

A

The height at which water can be lifted to provide enough gpm for a reliable fire flow

55
Q

How much does pump capacity decrease with 15’ and 20’ suction hoses when drafting

A

70% capacity at 15’

60% capacity at 20’

56
Q

During constant pressure relay pumping, how much hose does each engine lay

A

750 feet, unless the supply engine is within 100 feet of the source, then 850 feet can be laid

57
Q

What pressure gets pumped during constant pressure relay pumping

A

130 psi

58
Q

When constant pressure relay pumping, how much should be left on the intake gauge

A

20 psi for safety, and to ensure the pump does not cavitat

59
Q

During constant pressure relay pumping, when only pumping one line, how many feet can each engine lay

A

1,000-1,500 feet

Engineers Test (15 decks)

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