A centrifugal pump operating against a...

A centrifugal pump operating against a...

Question 1 of 270705eccef9bbacbc34ba4d4541f

A centrifugal pump operating against a closed discharge valve has a/an __________.

Question 1 of 27070

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Q

A centrifugal pump operating against a closed discharge valve has a/an __________.

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🔍 Key Concepts

• Centrifugal pump characteristics when the discharge valve is fully closed • Difference between capacity (flow rate), efficiency, and horsepower draw • The meaning of shutoff condition for a centrifugal pump

💭 Think About

• Think about what happens to actual flow through the pump when the discharge valve is completely closed. Is any liquid moving? • If no liquid is moving, what happens to useful work done by the pump versus power supplied to the pump? How does that affect efficiency? • At shutoff (closed discharge), does the pump necessarily draw maximum horsepower from the driver, or can horsepower be less than at normal flow?

✅ Before You Answer

• Be clear on the definition of capacity (it is a volumetric flow rate, not power or pressure). • Recall that efficiency compares useful hydraulic work output to power input—consider what the useful output is with no flow. • Remember that internal slippage still can occur in some pumps even when external flow is zero; think about how centrifugal pumps move liquid compared to positive displacement pumps.