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COA #53 > Pump Theory (Week 2) > Flashcards

Pump Theory (Week 2) Flashcards

1
Q

What does the anti siphon hole for a primer pump do?

A

It allows suction to be relieved when the primer motor is shut-off and prevents oil from being siphoned from the tank when not needed.

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2
Q

The vent hole in a primer tank cap does what?

A

It allows air into the primer pump tank so oil can flow through to the “PRIMER PUMP” for sealing and lubricating. (Do not confuse the “primer motor” with the primer pump!)

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3
Q

(True/False) Slippage is the ability of H2O to move through the pump “allowing” 100% discharge.

A

FALSE - Not allowing 100% disharge

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4
Q

A two stage centrifugal pump has…..?

A

Two impellers on a single shaft and each impeller has its own volute. Each volute discharges into a common outlet. This is all surrounded by the Pump Casing.

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5
Q

When running a fire engine pump and the pump RPM is increased, but there is no increase in pressure, wnat is most likely happening?

A

Sign of CAVITATION

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6
Q

How do you find your static pressure?

A

Open hydrant, open tank suction inlet valve, do not open and/or flow any lines and read the compound pressure.

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7
Q

Residual pressure is….?

A

the pressure remaining in a system while water is flowing

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8
Q

A good working Cal Fire engine can draft _____ to _____ feet?

A

15’-20’

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9
Q

It is acceptable to crack open your tank fill valve to recirculate water through your pump to prevent overheating. During this procedure you can drop the pressure ____ psi?

A

10

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10
Q

1 psi of atmospheric pressure will raise water ____feet?

A

2’

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11
Q

Green hydrant flows…..?

A

1,000 - 1,499 gpm

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12
Q

Orange hydrant flows….?

A

500 - 999 gpm

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13
Q

Red hydrant flows…..?

A

0 - 499 gpm

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14
Q

Blue hydrant flows….?

A

1,500 - gpm

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15
Q

The impeller shaft, impellers and volutes are housed by the _____?

A

Pump casing

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16
Q

The ______ valve controls the setting for a pressure relief valve.

A

Pilot valve (4-way valve)

17
Q

When pumping in pressure (series), if the first impeller is pumping 150psi to the second impeller what is the total pressure being pumped?

A

300psi (150+150 = 300psi) pumping in pressure requires the second propeller to double the pressure.

18
Q

What type of pump is used as a primer pump?

A

Positive Displacement Pump

19
Q

What type of pump will pump air?

A

Positive Displacement Pump

20
Q

What are three types of positive displacement pumps?

A

Piston pump, Rotary gear, Rotary vane

21
Q

When pumping, when do you switch from pressure to volume?

A

250gpm or half the rated capacity of the pump

22
Q

When pumping, when do you pump in pressure?

A

When pumping more than 200 psi

23
Q

Why do we use a rotary vane pump?

A

To remove air

24
Q

The process of removing air from the pump and replacing it with water is known as?

A

Priming

25
Q

What type of oil is used in the priming pump?

A

15-40W

26
Q

How many shafts are in a multi-stage centrifugal pump?

A

1

27
Q

At sea level what is the atmospheric pressure?

A

14.7 psi

28
Q

How much psi is lost in every 1000’ elevation increase?

A

½ psi

29
Q

For every 1000’ in elevation how much lift is lost?

A

1 foot

30
Q

Every mark on the vacuum gauge is equal to how much lift?

A

1 foot

31
Q

A compound gauge is capable of reading?

A

Vacuum and Pressure

32
Q

A water ejector has a ratio of _ to _ when flowing water?

A

3 to 1

33
Q

How far should the drafting hose be under water?

A

12” to 18” inches

34
Q

List the parts in the pressure relief valve?

A

Four way valve, pilot valve, and the relief valve

35
Q

What is another name for the tank filler valve

A

Churn Valve (recirculation valve)

36
Q

How many lines can be added if the difference between static and residual pressure is less than 10%, 15%, 20%

A

3, 2, 1

37
Q

What type of pressure gauges are on CDF engines?

A

Bourdon

38
Q

What are some common characteristics of a centrifugal pump?

A

Will pump no air, Needs a primer, Has up to 100% slippage

39
Q

What are some common characteristics of a positive displacement pump?

A

Needs no Primer, Pumps air, Has less than 10% slippage

COA #53 (10 decks)

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