On disassembling a centrifugal pump for...

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Question 1 of 205eccef9bbacbc34ba4d4549c

On disassembling a centrifugal pump for overhaul, the third engineer reports holes drilled axially in the back side of a single suction closed impeller. The reason for the these holes is which of the following?

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🔍 Key Concepts

• Axial thrust in single-suction centrifugal pumps and how it is created • Function of balance (relief) holes in closed impellers • Difference between features for hydraulic balance vs. features for maintenance or cooling

💭 Think About

• Ask yourself: what hydraulic forces act on the front vs. the back of a single-suction impeller, and what happens if pressures are unequal? • Think about where these axial holes are drilled and what they would connect or equalize inside the pump casing. • Which options describe a continuous, built‑in hydraulic function during operation, and which sound more like a one‑time maintenance aid or a secondary effect?

✅ Before You Answer

• Verify what pressure exists at the eye of the impeller compared with the pressure at the back side of the impeller without any holes. • Check which design feature is normally used to relieve axial thrust in single-suction closed impellers (e.g., balance holes, balancing disc, double-entry design). • Confirm whether impeller cooling or providing a place to attach a puller would require axial through‑holes in the impeller or a different type of feature.

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