JET 03 Centrifugal Pumps Flashcards
____________ is the rotating element through which liquid passes in a centrifugal pump?
impeller
Wear rings serve the same function as
wear plates.
TRUE
Which of the following is used to make
fine adjustments to the clearance between
the plates and impeller?
shims
Bearings support the shaft.
TRUE
Which of the following drive mechanisms
are used for the Schlumberger centrifugal
pumps? Select four that apply.
A. power-takeoff
B. hydraulic
C. electric
D. diesel
How do centrifugal pumps convert
mechanical energy into hydraulic energy?
by pushing fluid into the system
How does the volute affect the velocity of
energy of the liquid?
converts it into pressure
Total head can be increased by increasing
the rpm.
TRUE
Bearings support the shaft.
TRUE
Which of the following lubricate bearings?
Select two that apply.
A. oil bath
C. grease
A centrifugal pump primes itself.
FALSE
Worn packing can cause the seal to fail.
TRUE
Rope packing is used in RB23 centrifugal
pumps.
TRUE
Centrifugal pumps that use mechanical
seals are _________, _________, and
_________.
A. RA 4x5
B. RA 5x6
D. RB 2x3x11
Total suction head is the difference
between the levels of the discharge and
suction liquid.
FALSE
To minimize vortexing, perform which of the following (select three that apply):
A. Install crossbars in the suction of the pump and tank. C. Lower the pump rate. D. Float a large piece of wood over the suction opening in the tank.
The pressure within the pump must not fall
below the vapour pressure of the liquid at
the pumping temperature.
TRUE
To increase NPSH-A _________ ,
_________, and _________ .
A. Raise the liquid level.
B. Lower the pump.
D. Use a booster pump.
An operation is parallel when the
discharge sides of two pumps are
connected to the same outlet.
TRUE
You can operate centrifugal pumps
continuously near shutoff or zero capacity.
FALSE
Pumping liquid that contains abrasive
particles does not cause erosion.
FALSE
Air is mixed in the liquid being pumped as
a result of (select all that apply):
A. leaky suction lines
B. improperly assembled stuffing box
C. inadequate seals on the suction lift
hook-up
Series operations are not recommended
because of the high incidence of seal
failures in the second pump.
TRUE
When rigging up the centrifugal pump,
take into consideration _________.
A. rate
B. distance
C. pressure
D. viscosity of the fluid
