After which of the following is the air cock...

Question 1 / 270705eccefa0bacbc34ba4d46d24

Question 1 of 270705eccefa0bacbc34ba4d46d24

After which of the following is the air cock to be closed when raising steam on a cold boiler?

Question 1 of 27070

After which of the following is the air cock to be closed when raising steam on a cold boiler?

🔍 Key Concepts

• Purpose of an air cock (air vent) on a boiler when raising steam from cold • What condition inside the boiler makes continued venting of air no longer necessary • Sequence of steps when warming up and cutting in a boiler to the steam line

💭 Think About

• Think about what the air cock is actually removing from the boiler at the start of raising steam and what replaces it over time. • Ask yourself: at what point is the mixture of air and steam in the boiler no longer mostly air, and pressure/flow conditions are stable enough that venting is no longer needed? • Consider which event happens earliest in the startup sequence: steam forming and venting air, lighting all burners, cutting the boiler into the line, or closing the economizer drain.

✅ Before You Answer

• Identify the primary function of the air cock during a cold startup (what problem is it preventing?). • Determine which step in the startup sequence comes first in time among the answer choices. • Verify at which step it becomes safe to stop venting air without risking trapped air or water hammer in the boiler.

Question 1 of 27070

After which of the following is the air cock to be closed when raising steam on a cold boiler?

steam has formed and all air is vented

all burners have been lit and firing normally

the boiler is cut in on the line

the economizer drain is closed

Question 1 / 270705eccefa0bacbc34ba4d46d24

Question 1 of 270705eccefa0bacbc34ba4d46d24

After which of the following is the air cock to be closed when raising steam on a cold boiler?

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Question 1 of 27070

After which of the following is the air cock to be closed when raising steam on a cold boiler?