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IDIS 403 > 403 - Pumps > Flashcards

403 - Pumps Flashcards

1
Q

Two types of pumps

A

Positive displacement pumps

Non-Positive displacement pumps

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2
Q

Types of positive displacement pumps

A

Reciprocating pumps

Rotary pumps

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3
Q

Types of reciprocating pumps

A

Piston pumps
Plunger pumps
Diaphragm pumps

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4
Q

Types of rotary pumps

A 
Progressive cavity
Sliding vane
Lobe
Gear
Peristaltic
Screw
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5
Q

Progressing cavity

A 
Rolls liquid
Very thick liquid
3 stages of rotor and cavity
Solid size smaller than opening
Takes up a large amount of space and is expensive
Very gentle pumps
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6
Q

Progressive cavity advantages:

A 
Self-priming/Suction lift
Ability to vary capacity
Non-pulsating flow
Generates high pressure due to staging
Abrasive fluids
Handles high viscosity
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7
Q

Progressive cavity disadvantages:

A

Can’t run dry
Length of pump
Large foot print

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8
Q

Sliding vane pump

A

Unbalanced design
Allows for reverse flow, but need to reverse the check valve
Seals very well

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9
Q

Sliding vane pump advantages

A

Self-priming/Suction lift
Ability to vary capacity
Run dry for a short time
Handles low viscosities

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10
Q

Sliding vane pump disadvantages

A

Abrasive solids damage pump
Medium pressure capabilities
Material limitations
Not suitable for high viscosities

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11
Q

Lobe or Cam pump

A

Lobes don’t transfer power by touching each other, gears on the outside do that.

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12
Q

Lobe pump advantages

A

Self-priming/Suction lift
Ability to vary capacities
Reversible
Handles high viscosities

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13
Q

Lobe pump disadvantages

A 
Abrasive resistance
Pressure capabilities
Stuffing box
Jamming
Pump efficiency
Non-pulsating flow
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14
Q

External gear pump

A

Also known as trash pump

Becoming less common

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15
Q

External gear pump advantages

A 
Self-priming/Suction lift
High speed
Ability to vary capacity
Non-pulsating pump (depends on the speed)
Run dry for a short time
High temperature
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16
Q

External gear pump disadvantages

A 
High pressure causes slip
No solids allowed
Abrasion
High shear
Low viscosity fluids
17
Q

Internal gear pump

A

Very common

Similar to external gear pumps

18
Q

Internal gear pump advantages

A

Ideal for high viscosity liquids
Constant non-pulsating flow
Self-priming/Suction lift
Low NPSH required

19
Q

Internal gear pump disadvantages

A 
High pressure causes slip
No solids 
Not abrasive resistant
High shear, metal to metal contact 
Low viscosity fluids
20
Q

Screw pump

A

Not as common
Screws don’t touch
Very fast and very high volume

21
Q

Screw pump advantages

A

Non-contacting
Non-pulsating flow
Run dry for a short time
High flow and high pressure

22
Q

Screw pump disadvantages

A

Solids
Abrasions
High shear
Low viscosities fluids

23
Q

Peristaltic pump

A

Pulse type

Medical industry

24
Q

Peristaltic pump advantages

A 
Self-priming/Suction lift
Ability to vary capacity 
Handles "difficult" fluid
Reversible 
Can run dry
No seals
25
Q

Peristaltic pump disadvantages

A 
Pressure
Temperature
Short hose life
Pulsation
High HP requirement
Less efficient
26
Q

Air diaphragm pump

A

Valve goes back and forth due to differential pressure.

Real simple

27
Q

Air diaphragm pump advantages

A 
Self-priming/Suction lift
Ability to vary capacity
Handles abrasive and suspended solids
Handles viscous liquids
Run dry
Length of pump
No seals
Submersible
No efficiency loss due to air
28
Q

Air diaphragm pump disadvantages

A 
Pressure 
Noise 
Pulsation
Limited by air flow and compressor
Power consumption
29
Q

Types of Non-Positive displacement pumps

A

Centrifugal pump
Volute pump
Diffuser pump
Concentric volute pump

30
Q

Centrifugal pump

A

Pressure creating device
Converts velocity energy to pressure energy
Flow depends upon system characteristics

31
Q

Volute pump designs:

A

Radial design
Mixed flow
Axial flow

32
Q

Diffuser pump designs

A

Vertical turbine

Horizontal

33
Q

Concentric volute designs

A

Regenerated turbine
High speed
Radial vane
Recessed impeller

34
Q

Part A

A

Negative pressure inside the pumps pushes the fluid to the inside is the pump.

35
Q

Part B

A

The impellers coverts velocity energy to pressure energy.

36
Q

Part C

A

The fluid is at a maximum pressure energy.

37
Q

Part D

A

The fluid leaves the impellers after reaching a max pressure energy.

38
Q

Part E

A

The fluid is being discharged from the pump.

IDIS 403 (17 decks)

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