USMMA IME Pump Quiz

2 Types of Pump Classification

Kinetic and Positive Displacement

Dynamic/ Kinetic Pumps

A principle when motion is imparted to a fluid the increase in potential energy due to the fluid motion may be converted into a higher pressure

Positive Displacement Pump

Delivers a definite quantity of liquid per stroke or revolution.

**Positive Displacement Pump

MUST be operated with the discharge valve OPEN!

2 Types of Positive Displacement Pumps

Reciprocating Pumps and Rotary Pumps

2 Types of Reciprocating

Piston and Diaphragm

3 Types of Kinetic Pumps

Centrifugal, Peripheral, Special

Centrifugal (Radial Flow)

Rotary Pumps

-Gear Pumps -Lobe Pump -Screw Pump -Sliding Valve Pump

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Gear Pumps

a type of positive displacement (PD) pump. It moves a fluid by repeatedly enclosing a fixed volume using interlocking cogs or gears, transferring it mechanically using a cyclic pumping action.

Lobe Pumps

positive-displacement type pumps that use two or more lobes rotating around parallel shafts in the pump's body to move liquids

Screw Pumps

More helpful in pumping heavy oil. They even have the ability to pump higher flow rates and higher viscosity fluids.

Sliding Vane Pumps

A pump in which the vanes (=flat parts) are the main sealing element between the suction and discharge areas.

Total Head

Head due to difference in pressure between the discharge and suction side of the pump.

**Centrifugal Pumps

May be started and run with the discharge valve CLOSED.

Volute Pump

As the fluid moves thru the volute it loses velocity and increases in pressure.

Impeller eyes single

the fluid enter on one side only.

Impeller eye double

the fluid enters on both sides

Wearing Rings

Used to reduce leakage of high pressure liquid from the discharge side of the pump back to the suction side area of the casing.