While your vessel is steaming with one...

Question 1 / 270705eccefa0bacbc34ba4d46ec3

Question 1 of 270705eccefa0bacbc34ba4d46ec3

While your vessel is steaming with one boiler, the automatic combustion control system sensing line for the idle boiler is accidentally opened. How will this affect the steaming boiler?

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Question 1 of 27070

While your vessel is steaming with one boiler, the automatic combustion control system sensing line for the idle boiler is accidentally opened. How will this affect the steaming boiler?

🔍 Key Concepts

• Automatic combustion control (ACC) maintains steam drum/header pressure by adjusting fuel and air flow. • The sensing line carries the pressure signal from the boiler/header to the controller. • Consider what the controller "thinks" happens to pressure if a sensing line is opened to a non‑pressurized space on the idle boiler.

💭 Think About

• If the sensing line on the idle boiler is opened, what pressure does the controller see on that line compared to actual steam pressure? • When ACC believes steam pressure is too low, does it increase or decrease fuel to the firing boiler? How does that change actual steam pressure? • Does this faulty pressure signal act directly on boiler water level, or only indirectly through firing rate?

✅ Before You Answer

• Be clear on whether ACC is primarily a pressure control or water‑level control system. • Decide whether an opened sensing line makes the controller see higher or lower pressure than real. • Ask: Will the immediate controlled variable affected be steam pressure or drum water level? Focus on the first‑order effect.

Question 1 of 27070

While your vessel is steaming with one boiler, the automatic combustion control system sensing line for the idle boiler is accidentally opened. How will this affect the steaming boiler?

The steam pressure will drop.

The water level will drop.

The steam pressure will rise.

The water level will rise.

Question 1 / 270705eccefa0bacbc34ba4d46ec3

Question 1 of 270705eccefa0bacbc34ba4d46ec3

While your vessel is steaming with one boiler, the automatic combustion control system sensing line for the idle boiler is accidentally opened. How will this affect the steaming boiler?

Back

Question 1 of 27070

While your vessel is steaming with one boiler, the automatic combustion control system sensing line for the idle boiler is accidentally opened. How will this affect the steaming boiler?