If it is necessary to operate a turbine...

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Question 1 of 205eccef9cbacbc34ba4d457e4

If it is necessary to operate a turbine driven main feed pump at shut off head, or at less than 20% of its rated capacity, what will prevent the pump from overheating?

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5eccef9cbacbc34ba4d457e4

If it is necessary to operate a turbine driven main feed pump at shut off head, or at less than 20% of its rated capacity, what will prevent the pump from overheating?

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🔍 Key Concepts

• Centrifugal pump minimum flow and why pumps overheat at very low flow or shutoff head • Difference between throttling a valve and providing a recirculation (bypass) line • Where recirculated flow should return in order to actually remove heat from the pump

💭 Think About

• Think about what physically cools a turbine‑driven feed pump when it is running: is it the steam to the turbine, the water through the casing, or something else? • If the discharge valve is almost closed at shutoff head, what is happening to the water in the pump casing? Is it moving enough to carry heat away? • Compare what happens if recirculated water goes back to the main suction source versus going back very close to the pump (such as the impeller eye). Which arrangement ensures continuous cool flow through the pump body?

✅ Before You Answer

• Verify which options provide continuous flow through the pump casing even when the main discharge is shut or very low. • Check which arrangement will remove heated water from the pump and replace it with cooler water from the suction source, instead of just swirling the same hot water. • Confirm that simply throttling valves (steam or discharge) does not by itself guarantee enough cooling flow through the pump at shutoff.

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Question 1 of 205eccef9cbacbc34ba4d457e4

If it is necessary to operate a turbine driven main feed pump at shut off head, or at less than 20% of its rated capacity, what will prevent the pump from overheating?

Back

Question 1 of 20

5eccef9cbacbc34ba4d457e4

If it is necessary to operate a turbine driven main feed pump at shut off head, or at less than 20% of its rated capacity, what will prevent the pump from overheating?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed