Which of the conditions listed will provide...

Question 1 / 205eccefa0bacbc34ba4d46d3e

Question 1 of 205eccefa0bacbc34ba4d46d3e

Which of the conditions listed will provide 'blow down' after the safety valve has lifted?

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Question 1 of 20

5eccefa0bacbc34ba4d46d3e

Which of the conditions listed will provide 'blow down' after the safety valve has lifted?

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🔍 Key Concepts

• Blow down of a safety valve: the difference between the pressure at which the valve opens and the lower pressure at which it reseats • How a pop-type safety valve uses steam flow and area changes (huddling chamber, enlarged area) to change the opening force once the valve has lifted • The difference between a valve being held open by an external control (pilot line) versus opening behavior caused by its own internal geometry

💭 Think About

• First, recall in your own words what "blow down" means for a boiler safety valve. Is it about how it opens, how far it opens, or the pressure at which it recloses? • Ask which option describes a change in forces on the disc after lifting that would allow the valve to stay open until pressure falls to a lower reseating value. • Consider which statements describe a control method (external pilot or changing set pressure) versus a built‑in mechanical design feature that produces a distinct opening and reseating pressure.

✅ Before You Answer

• Verify which choice clearly involves steam acting on an increased effective area after lift, enhancing opening force and thus affecting reseating pressure. • Check that the option you pick actually produces a different closing pressure from the original opening pressure (that’s what provides blow down). • Eliminate any choice that only talks about the valve opening "gradually" or being held open externally, without explaining a built‑in blow down mechanism in the valve design.

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Question 1 of 20

Which of the conditions listed will provide 'blow down' after the safety valve has lifted?

The valve is held open by a pressure pilot line.

Once the valve has opened, the existing steam pressure acts on an enlarged area creating an opening force greater than that which opened the valve.

Once the valve lifts, the set opening pressure changes.

The safety valve opens gradually but with decreasing lift during the blow down period.

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Question 1 / 205eccefa0bacbc34ba4d46d3e

Question 1 of 205eccefa0bacbc34ba4d46d3e

Which of the conditions listed will provide 'blow down' after the safety valve has lifted?

Back

Question 1 of 20

5eccefa0bacbc34ba4d46d3e

Which of the conditions listed will provide 'blow down' after the safety valve has lifted?

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