Perspectives: Plant InSites

Effectively Control PD Pumps

Varying of flow requires a different approach than that for centrifugal pumps

By ANDREW SLOLEY, Contributing Editor
Oct 9, 2015

Positive displacement (PD) pumps aren’t as common as centrifugal pumps at most plants. So, engineers typically are less familiar with how to control the flow of these pumps. Yet, many applications of PD pumps may benefit from flow control — e.g., direct control to meet process objectives or a cascade from level, temperature or other control loops.

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