MOMENTUM TRANSFER OPERATIONS

General pump classification

Examples.

Lobe pumps. 2-lobe vertical (left), 2-lobe horizontal (middle) and 3-lobe horizontal (right).

Sliding-vane pump (left) and flexible vane pump (right).

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PUMPS

Positive displacement Kinetic

Radial flow (centrifugal)Axial flow (propeller)Mixed flow

Rotary Reciprocating

- Gear (internal or external)- Vane (sliding or flexible)- Screw- Progressive cavity- Lobe (2, 3 or 4)

- Piston (single action / double action; and simplex or duplex)- Plunger- Diaphragm

Internal gear pump

Twin screw pump (left and middle) and triplex screw pump (right).

Progressive cavity pump

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Progressive cavity pump

Single acting piston (left) and double acting piston (right).

Diaphragm pump schematic (left), single diaphragm (middle) double-diaphragm (right).

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Main parts of a centrifugal pump

Types of impellers

Radial flow impeller (left), mixed flow impeller (middle) and axial flow impeller (right).

Closed impeller (left), semiopen impeller (middle) and open impellers (right)

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