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Millwright 2 > Pump2 > Flashcards

Pump2 Flashcards

1
Q

Density

A

Density is the mass of a substance per unit of volume. Pounds/ cubic foot.

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2
Q

Specific gravity

A

Specific gravity is the ratio of density of a substance that of water.

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3
Q

Pressure

A

Pressure is a measure of intensity of effort described as force per unit of area

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4
Q

Force divided by area

A

Pressure

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5
Q

The portion of weight on earths atmosphere that there’s down on the area of one square inch. It is average to 14.7 psi at sea level.

A

Atmospheric pressure

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6
Q

As you raise in altitude height above sea level the amount of atmosphere above you is

A

Reduced

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7
Q

Quote The altitude whenever you mentioned, atmospheric pressure or absolute pressure

A
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8
Q

Is the pressure of a liquid in the system red by a pressure gauge, it is in addition to atmospheric pressure, it is expressed in a gauge reading

A

Gauge pressure

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9
Q

Is a pressure plus the atmospheric pressure.

A

Absolute pressure

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10
Q

Absolute pressure

A

Yeah, for gauge reads 20 psig. Add 14.7

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11
Q

Expresses pressure below atmospheric pressure. It is frequently measured in mercury.

A

Vacuum pressure

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12
Q

Before pressure gauges were developed, measuring the height of a liquid was the only way to obtain pressure reading.

A

Head pressure

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13
Q

Head pressure

A

Head pressure is the height in feet of a column of water that is 1 ft.² at the base

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14
Q

This is the pressure at which liquid flushes into a vapour at a given temperature

A

Vapour pressure/boiling point

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15
Q

Do all liquids have the same vapour pressure versus temperature curve

A

No, everyone is unique.

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16
Q

Cavitation

A

When the pressure of a liquid is reduced to or below its vapour pressure, small bubbles or pockets of vapour called cavitation begin to form.  As these vapour bubbles moved to regions of higher pressure, they collapse or implode. 

17
Q

Aeration

A

Where a partial vacuum is created at the pump inlet , suction flange leaks, can draw air into the pump, this reduces the amount of liquid that can pass through the pump.

18
Q

Aeration

A

Because the air is combustible, this causes erratic delivery, which intern affects the pumps, performance and efficiency. It can also cause loss of priming the pump.

19
Q

This occurs when particles of liquid no longer move parallel with the axis of the pipe

A

Turbulent flow or nonlinear flow

20
Q

What is total head made up of?

A

Head pressure and velocity head

21
Q

If enough vapour is formed, it completely stops liquid Flow into the pump

A

Vapour bound

22
Q

What causes turbulent flow?

A

Bends, abrupt changes and cross sections, fittings and pipe, velocity that is too high

23
Q

If you have a loss of velocity, what happens

A

Increasing pressure

24
Q

Pump head

A

Velocity, head, friction head, section head, discharge head, net, positive section head, net positive suction head required

25
Q

Single stage double suction pump

A

They are split in the middle to allow for easy removal and inspection

 The casing includes a single section in that that splits to allow equal flow to each side of the impeller, and the volute that continues around both the top and bottom halves of the casing.

26
Q

Single stage double suction pump

A

Both suction and discharge flanged nozzles are in the bottom half

27
Q

Multi stage horizontal pump

A

The pressure is developed by centrifugal pump with a single impeller is limited. To increase this pressure several impellers are mounted in a series on the same shaft, each impeller is surrounded by its own volute or diffuser. The combination of these is called a stage.

28
Q

Radial flow centrifugal pump

A

Most common

29
Q

Axial flow pump

A

Propeller

30
Q

Axial flow pumps produce

A

Relatively low discharge head, but they produce large flow

31
Q

Peripheral pumps

A

High speed pumps /regenerative turbine pumps.

32
Q

One disadvantage of high-speed pumps

A

Require a higher NPSHA, to prevent liquids in Flushing into a vapour

33
Q

Regenerative, turbine pumps

A

High heads and low flow application

34
Q

What separates the suction in the discharge on regenerative turbine pump?

A

The stripper

Millwright 2 (4 decks)

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