In most marine boilers, the primary reason...

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Question 1 of 205eccefa0bacbc34ba4d46c8f

In most marine boilers, the primary reason the first few rows of generating tubes, called screen or furnace row tubes, are made larger in diameter than the rest of the generating tubes is because __________.

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🔍 Key Concepts

• Boiler circulation: natural vs. forced and the role of tube size in water flow and heat absorption • Heat transfer in the furnace zone: radiant vs. convective heat and which tubes see the highest heat flux • Effect of tube diameter on velocity, cooling, and metal temperature in high‑heat areas

💭 Think About

• Think about what happens to the water-steam mixture in the tubes that are directly exposed to the flame. How does tube size influence the risk of overheating or burnout? • Which choice actually explains why the tubes must be physically larger, rather than just describing a task they do in the boiler? • Consider natural circulation: do the hottest tubes usually act as downcomers or risers, and how would diameter affect that role?

✅ Before You Answer

• Which option directly connects greatest heat exposure with a need for increased cooling water flow? • Eliminate any choice that only talks about gas-side behavior (like screening or retarding gas flow) but does not explain metal protection and circulation inside the tube. • Verify which components normally serve as downcomers in a water-tube boiler: are they small exposed tubes or large, relatively cool external tubes?

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