A slight vacuum is maintained in the shell...

Question 1 / 2066636ef128f7522a1c52194f

Question 1 of 2066636ef128f7522a1c52194f

A slight vacuum is maintained in the shell of the first stage heater shown in the illustration. The primary reason for the vacuum is to __________. Illustration SG-0025

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Question 1 of 20

66636ef128f7522a1c52194f

A slight vacuum is maintained in the shell of the first stage heater shown in the illustration. The primary reason for the vacuum is to __________. Illustration SG-0025

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🔍 Key Concepts

• First-stage feedwater heater shell pressure and how it relates to the main condenser vacuum • Path of heater drains/condensate from higher-pressure heaters to lower-pressure components • Difference between what moves because of pressure differential versus what needs a mechanical pump

💭 Think About

• Look at where the shell side of this first-stage heater is connected in the plant. Is it closer in pressure to the main condenser or to the bleed-steam source? • If the shell is under a slight vacuum, what does that allow the heater drains or condensate to do without adding extra machinery? • Which choice actually uses the pressure difference between the bleed steam and the shell vacuum, and which choices talk about things that don’t really depend on shell vacuum?

✅ Before You Answer

• Identify whether the feedwater (inside tubes) or the steam/condensate (shell side) is affected by having a vacuum in the shell. • Decide which component downstream is at an even lower pressure than the heater shell (think: main condenser). • Eliminate any answer that confuses ensuring steam flow from the LP bleed with the purpose of having the shell under vacuum. The bleed steam already has higher pressure.

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Question 1 of 20

A slight vacuum is maintained in the shell of the first stage heater shown in the illustration. The primary reason for the vacuum is to __________. Illustration SG-0025

avoid the necessity of having to use the condensate pumps

force the use of the main condenser as the drain cooler

maintain a positive flow of steam as supplied by the main engine LP bleed system

provide a low-pressure area to guarantee feed water flow to the heater

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Question 1 / 2066636ef128f7522a1c52194f

Question 1 of 2066636ef128f7522a1c52194f

A slight vacuum is maintained in the shell of the first stage heater shown in the illustration. The primary reason for the vacuum is to __________. Illustration SG-0025

Back

Question 1 of 20

66636ef128f7522a1c52194f

A slight vacuum is maintained in the shell of the first stage heater shown in the illustration. The primary reason for the vacuum is to __________. Illustration SG-0025

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