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Block 3 > Pump Terms > Flashcards

Pump Terms Flashcards

Learn the pump terminology

1
Q

What is the vertical distance from the liquids supply level to the pump centre line when the liquid supply level is below the pump centre line?

A

Static suction lift

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2
Q

What is the vertical distance from the liquid supply level to the pump centre line when the liquid supply level is above the pump centre line?

A

Static suction head

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3
Q

What is 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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4
Q

What is 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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5
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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6
Q

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

A

Velocity head

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7
Q

What is equivalent to the static suction lift plus the velocity head minus all frictional losses in the suction pipes and fittings?

A

Dynamic suction lift

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8
Q

What is the equivalent to the static suction head minus the velocity head and all of the frictional losses in the suction pipes and fittings?

A

Dynamic suction head

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9
Q

What is equivalent to the static discharge head plus the velocity head and all of the frictional losses in the discharge pipes and fittings?

A

Dynamic discharge head

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10
Q

What equals the dynamic suction lift plus the dynamic discharge head,but also equals the dynamic discharge head minus the dynamic suction head?

A

Total dynamic head

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11
Q

How are pump sizes expressed?

A

The diameter of the discharge nozzle, suction nozzle and impeller in inches or millimetres.

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12
Q

What is a pump?

A

A machine that moves fluid or semi fluids. It moves them into, through or out of a system, against the action of gravity and other forces such as friction.

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13
Q

What is caused when the centrifugal force created by the impeller is the same as the resistance in the discharge pipe?

A

Slip

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14
Q

What is pump head?

A

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

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15
Q

What happens if pressure on the suction side of a pump drops below the vapor pressure of the liquid?

A

Vapor binding.

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16
Q

What happens if pressure inside centrifugal pump drops below the vapor pressure and vapor bubbles form. The bubbles flow with the liquid until they reach an area of higher pressure then collapse producing a Shockwave?

A

Cavitation

17
Q

How is a pump’s capacity determined?

A

By the volume of liquid delivered per unit of time

18
Q

Which pump has little suction power and they’re usually mounted below the surface of the liquid being pumped?

A

Axial flow pumps

19
Q

What are peripheral pumps?

A

Periphery pumps have the liquid entering at the periphery of the impeller and the pump energizes it and discharges it out again at its peripheral

20
Q

How are impellers mounted on the ends pump shafts?

A

Screwed on
Slide fit with a retaining plate against the shoulder
Tapered shaft and a nut as a keeper

21
Q

How are impellers mounted on the middle of a shaft?

A

A slide fit against the shoulder retained by a sleeve and nut.
Assigned fit against sleeves and retained by nuts on both ends of the shaft.

22
Q

What can cause a pump to lose efficiency

A

Losing clearance in the wear plates. Loses too much after 3x the initial clearance.

23
Q

What determines the material the wear rings are made of?

A

The pumped liquid.

24
Q

What type of mounting does the motor shaft extend through the pump casing and then the impeller is attached directly to the motor shaft?

A

Close-coupled mounting.

25
Q

What precautions that must be taken before startup of a pump?

A

The unit will turn over freely by hand.
The pump is driven in the direction shown on the pump casing.
All bearings are properly lubricated.
The pump is primed.
All air from the seal housing is vented.
Plenty of quenching fluid is flowing to the seals.

26
Q

What do you inspect in a preventative maintenance check on a pump?

A 
Volume and temperature of liquid leaking past the packing.
Oil level.
Bearing temperatures and noise.
Joints and seals for leaks.
Flow rates at operating conditions.
27
Q

What are the four categories of centrifugal pumps?

A

Radial
Mixed
Axial
Peripheral

28
Q

What is specific gravity?

A

The ratio of density of a substance to that of water.

29
Q

Which type of pump is used when large volumes of liquid need to be moved at a relatively low discharge pressure? Dynamic or positive displacement?

A

Dynamic

30
Q

Which gauge uses atmosphere as a reference point and which gauge uses absolute zero as a reference point?

A

Gage readings use atmosphere and absolute readings use absolute zero as their reference points

31
Q

How much head pressure is 1 ft of water?

A

0.433 psi

32
Q

What is turbulent flow caused by?

A

Bends
Abrupt changes in cross section
Fittings in the pipe
Velocity that is too high

33
Q

What can cause frictional loss?

A

The size, type and condition of the piping and fittings
The flow velocity
The viscosity and density of the liquid being pumped

34
Q

Theoretically a centrifugal pump operating under perfect conditions can lift water how many feet at sea level pressure?

A

34 ft

35
Q

When should a radial flow pump be used?

A

Where a reasonably high discharge head is required.

36
Q

What are the four basic types of casings?

A

Volute
Double volute
Concentric
Diffuser

37
Q

The impeller of a pump can decrease by how much of its maximum value before hydraulic losses affect pump efficiency?

A

20%

Block 3 (3 decks)

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