When starting a turbine driven boiler feed...

Question 1 of 270705eccef9cbacbc34ba4d457ce

When starting a turbine driven boiler feed pump, care should be taken to ensure that the recirculating valve is open. Which of the following valves should be closed when starting?

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Question 1 of 27070

When starting a turbine driven boiler feed pump, care should be taken to ensure that the recirculating valve is open. Which of the following valves should be closed when starting?

🔍 Key Concepts

• Turbine-driven boiler feed pump starting sequence (what must be open so the turbine and pump can actually run) • Purpose of the recirculating (minimum flow) valve and how it protects the pump when discharge flow is low or zero • Effects of starting a centrifugal pump with the suction, discharge, steam supply, and exhaust valves in different positions

💭 Think About

• Ask yourself: Which valve(s) absolutely must be OPEN for the turbine to spin and for water to reach the pump impeller at start-up? • If the recirculating valve is open, which line already provides a safe flow path so the pump is not "deadheaded" even if one other valve is closed? • For each option, imagine it is CLOSED at startup. What specific problem would that create: no steam flow, no water to pump, no turbine exhaust, or just reduced discharge to the system?

✅ Before You Answer

• Verify which valves are normally open whenever the turbine is in operation (think: steam path in and out of the turbine, and water supply into the pump). • Confirm that the recirculating valve open means the pump has a flow path back to the deaerator/feed tank even if the main line is not yet flowing. • Eliminate any choice where closing that valve would prevent either steam flow through the turbine or water flow into the pump at start.