Pumps Flashcards
A pump may be simply defined as a device used to move a _____ or ____ from one place to another
liquid or gas
Although water is the most frequently pumped substance, any substance which can be changed into a _____ can be pumped
fluid
Pump Classifications:
According to their method of operation, pumps can be divided into two main classifications;
- Positive _______
- _________ (Refrigeration Trade)
- positive displacement
2. centrifugal
Pump Selection Factors:
- Pressure ______
- Volume of ______ to be pumped
- Location of the _____
- specific _______ of the fluid
- required
- liquid
- pump
- specific gravity of the fluid
Pump Applications:
Examples; name a few
- boiler feed water pumps
- condensate pumps
- fuel oil pumps
- chemical feed pumps
- fire pumps
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
True
Pump terms:
- Capacity: volume measured in ______ per minute (GPM)
- Head: Pressure at the base of a column of water is usually measured by the height of the water column in ____
- gallons per minute
2. feet
Pump terms:
- The pressure is then converted to a height of a column in which the pumped liquid can _______
- This height is measured in feet or meters and is simply called head or head ______
- maintain
2. pressure
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 __
up
Net Positive Suction Head (NPSH) :
- A minimum positive pressure at the pump suction flange is required to prevent ________. which is the formation of vapour bubbles
cavitation
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 ________
centerline
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 _______
discharge
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
supply
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
pressure
Velocity Head:
Velocity head is the force causing the fluid to flow through a chamber which is due to the ______ of the liquid
velocity
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
frictional
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
True
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
true
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
True
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
true
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 _____
inlet
If a pump is leaking, what should be your first and second instinct on replacement parts?
- shaft seal
2. gasket
If shaft seal is leaking on pump, look if the ____ on shaft seal is dripping
hole
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 _____
motor
