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Millwright Level 3 > Pumps > Flashcards

Pumps Flashcards

1
Q

The two basic classifications of pumps

A

Dynamic and Positive displacement

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2
Q

This uses centrifugal force to spin it outwards and move fluid

A

Dynamic pumps (non-positive displacement)

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3
Q

The four categories of centrifugal pumps based on flow

A

Radial
Mixed
Axial
Peripheral

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4
Q

The pressure that a pump has to overcome to be able to move liquid through the system

A

Pump head

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5
Q

Pressure converted to a height of a column in which the pumped liquid can maintain

A

Head (measured in feet or meters)

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6
Q

The vertical distance from the liquid supply level to a pump centre line when the liquid supply level is below the pump centre line

A

Static suction lift

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7
Q

The vertical distance from the liquid supply level to a pump centre line when the supply level is above the pump centre line

A

Static suction head

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8
Q

The vertical distance from the pump centre line to either the surface of the liquid in the discharge tank or to the point of discharge

A

Static discharge head

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9
Q

The vertical distance from the liquid supply level to the surface of the liquid in the discharge tank or to the point of discharge

A

Total static head

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10
Q

The pressure needed by the fluid to overcome friction as it moves through piping, valves and fittings in the system

A

Frictional loss

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11
Q

The force causing the fluid to flow through a chamber which is due to the velocity of the fluid

A

Velocity head

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12
Q

The term most used in industry to describe a pumps head

A

Total dynamic head

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13
Q

To prevent cavitation an vapour binding and ensure maximum flow through the pump, the required pressure at the pump suction is called this

A

Net positive suction head (NPSH)

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14
Q

How are pumps sized

A

Diameter of discharge nozzle, suction nozzle, and impeller

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15
Q

In this pump, the rotating impeller discharges the fluid into a spiral-shaped cavity

A 
Volute pumps (radial)
Has tangential velocity
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16
Q

These pumps create multiple volutes

A

Diffuser pumps (radial)

17
Q

In these pumps the impeller moves liquid through the casing without changing it’s direction

A

Axial-flow (impeller like a ships propeller)

Mounted vertically, below liquid being pumped

18
Q

This pump combines characteristics of radial and axial flow pumps

A

Mixed-flow

19
Q

Pumps equipped with several impellers connected in series

A

Multi-stage pumps

20
Q

Type of peripheral pump that creates high pressure for their size, used in compact areas

A

Regenerative turbine pump

21
Q

Two types of pump casings

A

Split

Barrel (for multi-stage high pressure centrifugal pumps)

22
Q

How much wear is not allowable for efficiency

A

If it exceeds three times the initial clearance in the pump (can be fixed by changing wear rings)

23
Q

3 types of wear rings

A

Flat, Stepped (L-shaped), Labyrinth

Often made of bronze or cast iron

24
Q

When are mechanical seals used

A

When leakage is not wanted due to whats being pumped

Used in high pressures

25
Q

3 types of pump mounting

A

Base, centre-line, close-coupling

26
Q

These pumps are used where a constant flow or measured amount of flow is critical

A

Positive displacement

27
Q

The two classifications of positive displacement pumps

A

Reciprocating and Rotary

28
Q

Two types of reciprocating pumps eccentric shaft

A

Piston/plunger (low flow rates, no dirty fluids)

Diaphragm (prevents leakage and corrosion)

29
Q

Rotary pumps have ____ or _____ delivery

A

Fixed or variable

30
Q

How big should the filter to the pump be

A

Twice the pump capacity

31
Q

Dynamic pumps are applicable for flows from __ gpm to _____ gpm

A

5 to 2 million gpm

32
Q

The most common dynamic pump in industry

A

Radial flow

33
Q

Single stage end suction pumps represent _% of all centrifugal pumps

A

75%

34
Q

When is centreline mounting used

A

Liquids above 175C (350F)

35
Q

The performance of a new pump will fall within __% of the performance curve

A

+-3%

36
Q

Types of pump casings

A

Volute
Double Volute
Concentric
Diffuser

37
Q

How big should the suction pipe be

A

One to two sizes larger than the diameter at the pump suction flange

38
Q

There should be a minimum of __ diameters of straight pipe between the elbow and the pump suction

A

10

Millwright Level 3 (5 decks)

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