General Subjects (Auxiliaries & Systems) USCG Question #2230 (Set 35)

When ordering a new centrifugal pump for installation, what is the advantage of a pump with a double suction impeller over a single suction impeller?

Official USCG Answer & Rule Citation

Correct Answer: Option C — The pump will experience less axial thrust.

Double suction impellers allow fluid to enter from both sides, which balances the hydraulic forces acting on the impeller. This design significantly reduces axial thrust, thereby decreasing the load on the pump's thrust bearings and extending the service life of the rotating assembly and mechanical seals.

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