Section 1 - Pumps Flashcards
Name the two pump groups
Positive Displacement
Rotodynamic
What are Positive Displacement pumps commonly used for
Used with oil,
Relatively low flow,
High pressure
What are Rotodynamic pumps commonly used for
Water,
Relatively high flow,
Low pressure
What types of pumps are Rotodynamic
Centrifugal,
Axial flow
What type of centrifugal pumps are there
Volute,
Diffuser,
Both can be single and multi stage
What kind of positive displacement pumps are there
Reciprocating,
Rotary
List the most common types of positive displacement pumps
Reciprocating,
Gear pump,
Lobe pump,
Vane pump,
Screw pump,
Variable delivery piston pump (axial and radial)
What do positive displacement pumps have in common
Normally self priming,
Discharge valves must be open prior to starting,
Relief valves are normally fitted
What are the two forms of variable delivery piston pumps
Axial and radial
List the pump characteristics of a variable delivery piston pump
Positive displacement,
Self priming,
Uni-directional,
Flow can be reversed,
Constant speed,
Pumping rate can be varied
How can an axial piston pump flow rate be changed
By adjusting the angle of the swash plate as this determines the length of the piston stroke, therefore the capacity of the pump
Explain a Positive Displacement pump
A type of pump that moves a fixed volume of fluid through its mechanical action, creating a continuous flow without relying on high velocity
Explain a Reciprocating pump
A positive displacement pump that uses a piston or plunger to create pressure and move fluid by reciprocating back and forth within a cylinde
Explain a Rotary pump
A positive displacement pump that uses rotating elements such as gears, lobes, or screws to transfer fluid from the inlet to the outlet
Explain a Diaphragm pump
A type of positive displacement pump where a flexible diaphragm moves up and down, creating pressure variations to pump the fluid
Explain a Screw pump
A positive displacement pump that uses inter meshing screws to move fluid axially, pushing it from the inlet to the outlet
Explain a Rotodynamic pump
A type of pump that imparts energy to the fluid through a rotating impeller, converting mechanical energy into fluid flow velocity
Explain a centrifugal pump
The most common type of rotodynamic pump, utilizing a rotating impeller to increase the fluid’s kinetic energy, causing it to be expelled from the pump’s outlet
Explain a Axial Flow pump
A type of rotodynamic pump in which the fluid flows parallel to the pump shaft, generating lift due to the propeller-like action of the impeller
Explain a Mixed flow pump
A hybrid of centrifugal and axial flow pumps, where the fluid flow exits both radially and axially, combining characteristics of both types
Explain a Multistage pump
A rotodynamic pump with multiple impellers arranged in series, each imparting additional energy to the fluid, enabling it to handle higher pressures efficiently
Explain a gear pump
A type of positive displacement pump that uses interlocking gears to move fluid between the gear teeth, generating a steady flow without pulsation
Explain a Vane pump
A positive displacement pump employing sliding vanes inside a cylindrical rotor to create fluid movement and generate pumping action
