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Apparatus Tech > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

The formula for determine the volume of rectangular shaped containers

A

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

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2
Q

Formula to determine the volume of a cylinder, pipe, or hose in gallons?

A

= pie x r2 x H’ (or L’) x 7.5

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3
Q

Formula for determining smooth bore nozzle discharge

A

gpm= 29.7 x d2 x square root of NP

Square root of 80 is 8.94
Square root of 100 is 10

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4
Q

Theoretical GPMs for a hand line at 50psi

A

Tip size Gpm
1/2”. 53
7/8”. 161
15/16”. 185
1”. 210
1 1/8”. 266
1 1/4”. 328

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5
Q

Theoretical GPMs for master stream at 80 psi

A

Tip size. GPM
1 1/4”. 415
1 3/8”. 502
1 1/2”. 598
1 3/4”. 814
2”. 1062

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6
Q

The 1” adjustable gallonage fog nozzle is adjustable flow nozzle that can be at to deliver?

A

12-60 gpm

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7
Q

The 1 1/2” Akron Assault nozzle flows?

A

175 gpm

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8
Q

The 2 1/2” Akron Fog Nozzle is an adjustable nozzle that can be set to deliver?

A

125-250 Gpm

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9
Q

Master stream fog nozzles have an operating range of?

A

150-2000 Gpm

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10
Q

Booster reels are usually 150’ long, 1” rubber line with an adjustable gallonage fog nozzle that can flow?

A

12-60 Gpm at 100 psi

(Other nozzles may be present)

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11
Q

Foresters hose comes in 50’ and 100’ sections. With an adjustable 1” fog nozzle it can flow?

A

12-60 Gpm

Or the 22gpm red fog can both be used at 100psi

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12
Q

The Decon showers are used for hazardous material incidents or to decon firefighter personnel. They flow?

A

270 Gpm at 75 psi

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13
Q

Piercing nozzles also called penetrating nozzles are commonly used to apply water to areas that are inaccessible to water streams, such as voids and attics. They flow?

A

125 Gpm at 100 psi

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14
Q

The 2 1/2” distributor nozzle flows?

A

250 Gpm at 100 psi

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15
Q

The 2 1/2” cellar nozzle flows?

A

350 Gpm at 100psi

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16
Q

The 1 1/2” cellar nozzle flows?

A

160 Gpm at 100 psi

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17
Q

3 different types of monitors in Fairfax

A

1.fixed monitors: permanently attached to pumper. Smooth bore flowing between 500-1000 Gpm
2. Quick attack mercury monitor flows 500 Gpm from either smooth or fog nozzle
3. Combination monitor. Are fixed to the pumper but can be detached and connected to a ground mount to be used as a portable monitor
- smooth bore flows between 500-1000gpm at 80 psi
-fog 350-1250 at 100 psi

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18
Q

1st principle

A

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

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19
Q

2nd principle

A

The 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.

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20
Q

3rd Principle

A

When the flow remains constant the friction loss in a hose will decrease when the diameter of the hose is increased. Larger the hose the smaller the friction loss.

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21
Q

4th principle

A

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

22
Q

Friction loss coefficients for hose sizes:

A

1” 150
1 3/4” 10
2” 8
2 1/2” 2
3” .8
3 1/2” .34
4” .2
5” .08

23
Q

Square root of 50?

A

7.071

24
Q

Square root of 80?

A

8.94

25
Q

1.75 squared

A

3.06

26
Q

1.85 squared

A

3.42

27
Q

One cubic foot contains ?

A

1728 inches

28
Q

50’ length of 1.75’’ hose contains?

A

6.24 gallons of water

29
Q

One cubic foot contains

A

7.5 gallons

30
Q

50’ length of 2.5’’ hose

A

12.74 gallons of water

31
Q

One gallon contains?

A

231 cubic inches

32
Q

50’ length of 3” hose contains?

A

18.35 gallons of water

33
Q

One gallon of freshwater weighs?

A

8.33 pounds

34
Q

100’ length of 4 “ contains?

A

65.25 gallons of water

35
Q

A column of water 1’ high exerts

A

.434 psi at the base

36
Q

A column of water

A

2.304’ high exerts a pressure of 1 psi at its base.

37
Q

100’ length of 5 ‘ hose contains?

A

101.94 gallons of water

38
Q

A handline with a smooth bore nozzle has a psi of_______. The pressure can be increased to _______ psi for greater flow.

A

50, 65

39
Q

A master stream with a smooth bore nozzle has a psi of ________. The pressure increased to________psi for greater flow.

A

80, 100

40
Q

The JS-10 nozzle flows _______gpm at ______psi

A

100, 100

41
Q

The portable foam eductor flows _______to ______gpm with a PDP of _______psi at the eductor

A

95, 125, 200

42
Q

The edctor must be _______ft from the pump panel and within ________ft of the nozzle.

A

50, 200

43
Q

The nozzle should be no higher than______ft above the eductor.

A

5

44
Q

Maximum flows from a pumper at draft:

A

Side intake : 1750 gpm
Front Intake: 900 gpm
Rear Intake: 1500-1750 gpm

45
Q

When incoming pressure exceeds ______psi, the pump shall be operated in pump gear.

A

50

46
Q

Maximum inlet pressure for mercury monitor

A

150

47
Q

Who has authority to request the aerial device to be supplied (two answers)

A

Charge lines on orders of the truck driver and oic.

48
Q

All 4” supply lines should be charged to ______psi initially

A

50 psi

49
Q

All 3” supply lines should be charged to ______psi initally

A

100 psi

50
Q

If a 4” and 3” supply lines are used together, they should be charged to a minimum starting pressure of?

A

100 psi

51
Q

What are the starting coefficients for two 3” lines?

A

.2

52
Q

The 1 1/2” distributor nozzle flows?

A

95 Gpm at 100 psi

Apparatus Tech (9 decks)

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