Chapter 31



Pumps fall into three basic types: momentum, centrifugal, and positive displacement.

Momentum-type pumps, such as steam- or gas-driven ejectors, present no particular layout other than with respect to suction lines and barometric legs.

The main layout difficulty with centrifugal pumps is avoidance of cavitation, which is mainly caused by restricting flow in suction pipework.

Positive displacement pumps must have pressure-relieving arrangements on the discharge side, either built-in to the machine or piped between the suction and discharge lines. They may also require surge vessels or pulsation dampening.


Pump; momentum; ejector; centrifugal; positive displacement; reciprocating; rotary

31.1 General

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