Pumps

Question 1

A pump may be simply defined as a device used to move a _____ or ____ from one place to another

Answer 1

liquid or gas

Question 2

Although water is the most frequently pumped substance, any substance which can be changed into a _____ can be pumped

Answer 2

fluid

Question 3

Pump Classifications:
According to their method of operation, pumps can be divided into two main classifications;

1. Positive _______
2. _________ (Refrigeration Trade)

Answer 3

1. positive displacement

2. centrifugal

Question 4

Pump Selection Factors:

1. Pressure ______
2. Volume of ______ to be pumped
3. Location of the _____
4. specific _______ of the fluid

Answer 4

1. required
2. liquid
3. pump
4. specific gravity of the fluid

Question 5

Pump Applications:

Examples; name a few

Answer 5

1. boiler feed water pumps
2. condensate pumps
3. fuel oil pumps
4. chemical feed pumps
5. fire pumps

Question 6

Terms and Definitions: Pump Head; T or F

Pump head is the pressure that a pump has to overcome to be able to move liquid through the system. This pressure is expressed in one of the following; psi, kPa, bar

Answer 6

True

Question 7

Pump terms:

1. Capacity: volume measured in ______ per minute (GPM)
2. Head: Pressure at the base of a column of water is usually measured by the height of the water column in ____

Answer 7

1. gallons per minute

2. feet

Question 8

Pump terms:

1. The pressure is then converted to a height of a column in which the pumped liquid can _______
2. This height is measured in feet or meters and is simply called head or head ______

Answer 8

1. maintain

2. pressure

Question 9

Never turn the inlet of your pump off when testing or it will capitate and break the pump, you can, however, turn the discharge off and your pressure should go __

Answer 9

up

Question 10

Net Positive Suction Head (NPSH) :

1. A minimum positive pressure at the pump suction flange is required to prevent ________. which is the formation of vapour bubbles

Answer 10

cavitation

Question 11

Static Suction head is the vertical distance from the liquid supply level to the pump centreline when the liquid supply level is above the pump ________

Answer 11

centerline

Question 12

Static discharge head is the vertical distance from the pump centreline to either the surface of the liquid in the discharge tank or go to the point of _______

Answer 12

discharge

Question 13

Total static head is the vertical distance from the liquid ______ level to the surface of the liquid in the discharge tank or to the point of discharge

Answer 13

supply

Question 14

Frictional Loss:

Frictional loss is the ______ needed by the fluid to overcome friction as it moves through the piping, valves, and fittings in the system

Answer 14

pressure

Question 15

Velocity Head:

Velocity head is the force causing the fluid to flow through a chamber which is due to the ______ of the liquid

Answer 15

velocity

Question 16

Dynamic Suction Lift:

Dynamic lift is equivalent to the static suction lift plus the velocity head, minus all the _______ losses in the suction pipes and fittings

Answer 16

frictional

Question 17

Dynamic Suction Head: T or F

Dynamic suction head is equivalent to the static suction head minus the velocity head and all the frictional losses In the suction pipes and fittings

Answer 17

True

Question 18

Dynamic discharge head: T or F

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

Answer 18

true

Question 19

Total dynamic head is the term most used in industry to describe a pumps head:

T or F? Dynamic head equals the dynamic suction lift plus the dynamic discharge head

Answer 19

True

Question 20

Total dynamic head: * Systems with Suction head*

For pumping systems which have a suction head, as illustrated, the total dynamic head equals the dynamic head minus the dynamic suction head

Answer 20

true

Question 21

Centrifugal Pumps:

These pumps use an impeller to move the water. The water is driven by the impeller and moves with a greater velocity at the outlet, creating a low pressure area at the _____

Answer 21

inlet

Question 22

If a pump is leaking, what should be your first and second instinct on replacement parts?

Answer 22

1. shaft seal

2. gasket

Question 23

If shaft seal is leaking on pump, look if the ____ on shaft seal is dripping

Answer 23

hole

Question 24

Shaft seal has an engineered channel that goes to a hole so that the water will drip out of the whole and not into the _____

Answer 24

motor