What condition listed below would...

🔍 Key Concepts

• Centrifugal pump performance and how head pressure should respond when the discharge valve is throttled or closed • Typical symptoms of pump wear (impeller wear, internal clearances, casing erosion) versus symptoms of drive motor or coupling problems • Difference between problems that require pump overhaul vs. problems that indicate external/ancillary equipment issues

💭 Think About

• Which option directly reflects a loss of hydraulic performance inside the pump, rather than an issue with the motor, coupling, or speed control? • In a healthy centrifugal pump, what should happen to discharge pressure (head) when you slowly close the discharge valve at constant speed? • Which of the listed symptoms would be the most specific and measurable indication that internal wear or damage has reduced the pump’s ability to build head?

✅ Before You Answer

• Verify which symptom is a hydraulic performance issue (pressure/head) rather than a mechanical noise/vibration symptom only • Check which condition would still occur even if the motor and coupling are in perfect condition • Confirm which option indicates the pump can no longer develop additional head when flow is restricted (a classic sign of worn internals requiring overhaul)

What condition listed below would specifically indicate that a pump overhaul was necessary for a centrifugal saltwater service pump.

Indicated head pressure does not change when discharge valve is closed.

Observed operational speed has decreased

Excessive noise coming from drive motor

Excessive noise coming from pump coupling

🔍 Key Concepts

💭 Think About

✅ Before You Answer