If you hear a 'crackling' sound while...

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Question 1 of 205eccef9bbacbc34ba4d454d6

If you hear a 'crackling' sound while standing watch in the engine room coming from a centrifugal pump casing within a general service system, the most probable cause of the noise would be __________.

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🔍 Key Concepts

• Cavitation in centrifugal pumps and the noises it can create • How suction conditions (pressure, lift, NPSH) affect pump operation • Which problems are related to stuffing box/packing versus problems in the impeller and casing

💭 Think About

• Which of these choices would most directly affect the pressure of the liquid right at the pump eye (impeller inlet)? • Does a crackling or gravel-like sound usually come from air/vapor bubbles in the liquid, or from mechanical parts being installed incorrectly? • Which options deal with sealing around the shaft, and which deal with the pump’s ability to draw water up into itself?

✅ Before You Answer

• Identify which option changes the suction side pressure at the pump and could lead to vapor bubble formation • Separate the answers that affect the stuffing box/packing area from those that affect the hydraulic conditions inside the casing • Think about what condition commonly causes cavitation noise in centrifugal pumps when the source tank is below the pump or suction is marginal

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