An eccentric reducer, used as a transition...

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Question 1 of 205eccef9bbacbc34ba4d45462

An eccentric reducer, used as a transition piece between a centrifugal pump suction flange and the suction piping flange, must be installed with the eccentric portion below the suction pipe centerline to __________. See illustration GS-0089.

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🔍 Key Concepts

• Eccentric reducer orientation on a centrifugal pump suction line • How air or vapor behaves in a horizontal suction pipe versus sediment • Centrifugal pump performance issues caused by air pockets or vapor at the eye of the impeller

💭 Think About

• Look at the illustration and picture where any trapped air or vapor would naturally rise inside the pipe—would that be at the top or bottom of the line? • If the flat side of the eccentric reducer is on the top versus on the bottom, what changes in the flow path toward the pump eye? • Which of the answer choices describes a condition that would directly harm a centrifugal pump’s suction performance and priming ability?

✅ Before You Answer

• Verify which side of the reducer (flat or offset side) is shown closest to the top of the suction line in the illustration. • Consider whether centrifugal pumps are more sensitive to air/vapor at the suction or to sediment on the bottom of the line. • Check which option best explains maintaining a completely filled suction line with no high point where gas can accumulate.

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