Pumps Flashcards
Balance holes are drilled through?
The rear shroud on the inside of the wear ring
The paddlewheel impeller is also called a?
High-speed impeller
Inducers have what type of flow?
Axial-flow
Front wear rings minimize?
Suction recirculation
Pumps are primed by bleeding off gas or air through the?
Air vent
When blinding piping prior to pump removal, blinds should be placed?
Downstream of the suction valve and upstream of the discharge valve
The impeller converts mechanical energy into?
Hydraulic energy
Kinetic energy
The head produced by a pump varies?
With the square of the impeller diameter
N-
P-
S-
H-
Net
Positive
Suction
Head
As pressure on a liquid rises it’s boiling point?________________
Rises-
It increases 3 degrees for every psi
Bearings in a double suction pump are mainly for?
Radial loads
Axial flow pumps usually operate under conditions of?
Low head and high volume
Diffusers in a pump-
- slow the velocity of the liquid and increase its pressure.
- help balance radial bearing loads.
- can be incorporated in volume casings.
Regenerative type pumps are best suited where ___________ capacities and ___________ heads are required.
- low capacity
- high head
Velocity of fluid flow within the centrifugal pump is greatest near the?
Tips of the impellers
Concerning a multistage centrifugal pump the pressure increases at each
Stage
Which vane pump uses an oval rotor?
External vane pump
On a vertical plunger pump, the plunger is attached to the?
Yoke
A PTFE sandwich refers to?
An arrangement to prevent product escape
Which type of screw has a peristaltic action?
Single rotor
Which type of pump has a divider between the discharge and inlet ports?
Flexible liner pump
Which type of rotary pump best tolerates abrasives?
Single rotor screw pump
The pump least likely to be used for handling food products would be?
An external vane pump
Which pump has a cam inserted between the discharge and inlet ports?
Flexible vane pump
Which type of impeller has the lowest specific speed?
Radial-flow
Which type of impeller will handle the highest flows?
Axial-flow
