If a centrifugal main feed pump were...

If a centrifugal main feed pump were...

Question 1 of 270705eccef9cbacbc34ba4d457cf

If a centrifugal main feed pump were operated at shutoff head with the recirculating line closed, which of the following conditions could occur?

Question 1 of 27070

Q

If a centrifugal main feed pump were operated at shutoff head with the recirculating line closed, which of the following conditions could occur?

🔍 Key Concepts

• Centrifugal pump shutoff head and what happens to flow, temperature, and pressure when discharge is blocked and recirc is closed • How heat from the pump (friction/impeller work) affects the water at low or zero flow, especially at the suction side • The role of the recirculating/bypass line in protecting the pump and system components at low flow

💭 Think About

• When a centrifugal feed pump runs with no flow, where does the energy it imparts to the fluid go, and what happens to the fluid temperature in the pump casing? • If water in the pump casing is heated while suction pressure is limited, what could happen to the water at the eye of the impeller (think about boiling/phase change)? • Which of the listed options directly relates to damage or problems inside the pump itself versus elsewhere in the feed system (drum, regulator, DC heater)?

✅ Before You Answer

• Verify which option describes a condition inside or immediately at the pump rather than in remote system components like the steam drum or DC heater • Consider which effect is most immediate when operating at shutoff head with no recirculation, before level changes elsewhere would have time to occur • Check your understanding of the term “flashing” and where it is most likely to occur in a centrifugal pump running hot with low suction pressure