Nait 4Th Period Pumps For Private Water Supply

Front 1

What is the common name for a variable displacement pump

Back 1

Centrifugal

Front 2

List four reasons for using a centrifugal pump

Back 2

Easy to produce

Small and lightweight

Many convenient forms of drive

Good at moving liquid

Front 3

What brings water into the eye of a centrifugal pump

Back 3

Impellers

Front 4

Impellers take the fluid and force it through gradually widening passages called

Back 4

Vanes

Front 5

Rule: as velocity decreases

Back 5

Pressure increases

Front 6

Multiple impeller design can add more ___________ to the water leaving the pump than a single impeller design

Back 6

Pressure

Front 7

Adding more impeller stages does not increase the flow of the fluid leaving the pump, only its

Back 7

Pressure

Front 8

For maximum efficiency, the pump case must be

Back 8

Full of water

Front 9

The act of the impeller spinning creates what type of pressure

Back 9

Negative

Front 10

The lift capability of the pump depends on several factors

Back 10

Atmospheric pressure

Friction loss in the supply pipe

Condition of the pump

Front 11

The maximum theoretical lift of a centrifugal pump at sea level is

Back 11

34 feet

Front 12

Theoretical lift of 34ft is equal to

Back 12

14.7psi divided by the weight of water per foot of height

Front 13

The maximum practical lift at sea level is

Back 13

25 feet

Front 14

The practical lift of a pump must be reduced 1 foot for every _______ ft of elevation

Back 14

1000

Front 15

Pump designers consider centrifugal pumps to produce

Back 15

Head, not pressure

Front 16

If there is too much of this acting on a centrifugal pump, it will overcome the ability of the pump to move fluid

Back 16

Back pressure

Front 17

The pressure produced by a centrifugal pump is a relationship between quality of it manufacture and the

Back 17

Fluid being pumped

Front 18

When used as a suction pump, the suction line must be equipped with a ______ ______ on it’s inlet

Back 18

Check valve

Front 19

The check valve placed on the suction line is called a

Back 19

Foot valve

Front 20

What device must be added to a pressure tank that does not have air/water separation

Back 20

Air volume control

Front 21

The usual method to control a water supply pump is

Back 21

Pressure switch

Front 22

Thermal overload is

Back 22

The frequent on/off cycle of the pump

Front 23

The run cycle of the pump should be at least _____ min but not more than ______ times per hour

Back 23

2min

25 times

Front 24

Centrifugal pumps are available in two general classifications

Back 24

Above ground

In the well

Front 25

Reciprocating pumps are essentially a

Back 25

Piston pump

Front 26

Reciprocating pumps typically lift water from ________ wells

Back 26

Shallow

Front 27

Electric piston pumps used as suction pumps come in two varieties

Back 27

Horizontal reciprocating pumps

Deep well working head pumps

Front 28

Single acting means the pump moves water out of the cylinder only

Back 28

When the piston moves in one direction

Front 29

Double acting means the water moves out

Back 29

When the piston moves in either direction

Front 30

Double acting cylinder is made with _____ chambers

Back 30

Two

Front 31

What displacement are reciprocating pumps

Back 31

Positive

Front 32

Because it is a positive displacement pump, it must be protected by

Back 32

Pressure relief valve

Front 33

The pressure relief valve is usually set 15-20 pounds over the

Back 33

Pressure switch cut out

Front 34

Reciprocating pumps are commonly used for

Back 34

Low production wells

Front 35

To change a reciprocating suction pump to a deep well working head pump

Back 35

Move the piston into the well and connect it to the lifting mechanism with sucker rods

Front 36

Diaphragm pumps are not

Back 36

Positive displacement

Front 37

Diaphragm pumps must have a check valve on its

Back 37

Inlet and outlet

Front 38

Bladder pumps keep mechanisms away from

Back 38

Fluids

Front 39

Rotary pumps do not use impellers but is a

Back 39

Helical (screw like) shaft or meshing gears

Front 40

Regenerative turbine pump is commonly used for

Back 40

Municipal water applications

Front 41

Peristaltic pumps are similar to your heart and use a

Back 41

Squeezing action

Front 42

A peristaltic valve uses a tube to squeeze fluid and the mechanism never

Back 42

Comes in contact with the fluid

Front 43

A deep well turbine pump is

Back 43

Very large with very high pressure

Front 44

Deep well turbine pump impellers are called

Back 44

Bowls

Front 45

Deep well turbine pumps are often used for

Back 45

Irrigation

Front 46

Jet pumps incorporate what into the inlet of the impeller

Back 46

A nozzle and venturi

Front 47

The maximum depth of a jet pump is

Back 47

155ft

Front 48

How many sizes smaller is the driveline than the suction line in a deep well jetted pump

Back 48

1 size

Front 49

What creates the negative pressure on a jetted deep well pump

Back 49

Venturi

Front 50

The water inlet on a jet pump may be extended by a long pipe of the same size, maximum

Back 50

35 ft

Front 51

Submersible pumps use these to create pressure

Back 51

Stages

Front 52

Each stage in a submersible pump increases pressure by

Back 52

9psi/stage

Front 53

Submersible pumps for residential applications are typically _____ in dia. To fit into a 4in well

Back 53

3-5/8in

Front 54

At what distance are submersible pump control wiring tied

Back 54

Every 10ft

Front 55

Chemical feed pumps add chemicals to water in

Back 55

Measured doses

Front 56

Sewage pumps commonly use what type of impeller

Back 56

Open impeller

Front 57

Sump pumps commonly use what type of impeller

Back 57

Closed

Front 58

The delivery capacity of a pump should closely match the amount of water available in the aquifer. If it cannot you can use a

Back 58

Flow control fitting

Front 59

The 3 parts of a centrifugal pump diffuser are

Back 59

Turbine diffuser

Impeller

Diffuser cup

Front 60

Pitless adapters must be purchased by

Back 60

The size of the casing

Front 61

What may be added to the drop pipe to control flexing

Back 61

Torque arrestor

Front 62

To properly size the drop pipe and supply pipe to the house requires detailed calculations of

Back 62

Pipe lengths

Number of fittings

Flow rate of system

Elevation difference

Desired pressure at point of delivery

Front 63

Piping in a jetted pump must be _______ to start under positive suction head

Back 63

Primed

Front 64

How is a pump able to lift water from a well

Back 64

By creating a partial vacuum in the pumping chamber

Front 65

What condition may cause cavitation for a centrifugal pump

Back 65

Pump is working at maximum lift capacity

Front 66

Why are centrifugal pump suction lines installed with positive grade from the pump to the well inlet

Back 66

For better air elimination when priming

Front 67

How may drawdown in a well affect an aquifer

Back 67

Allow the aquifer to start releasing sand

Front 68

Which piston pump can be offset from the top of a well

Back 68

Shallow well piston

Front 69

Which pumps may produce enough pressure to damage a pressure system

Back 69

Reciprocating and submersible pumps

Front 70

List the three types of impellers used in centrifugal pumps

Back 70

Closed

Semi closed

Open