Advances in metallurgy and improved methods...

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Question 1 of 205eccefa0bacbc34ba4d46c99

Advances in metallurgy and improved methods of boiler tube fabrication has led to lighter tubes with wall thicknesses in the vicinity of 0.1 inches. A characteristic of these thin walled tubes is __________.

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🔍 Key Concepts

• Boiler tube wall thickness and heat transfer: how metal thickness affects the rate of heat flow from hot gases to water/steam • Stress and failure in thin vs. thick tubes: how pressure and temperature affect the chance of tube failure • Relationship between metal temperature, tube thickness, and cooling by water/steam inside the tube

💭 Think About

• If a tube wall is thinner, what happens to the distance heat must travel from the hot gas side to the water/steam side? How does that affect heat transfer? • How does a thinner wall affect the tube metal temperature, given that the inside is cooled by water/steam under circulation? • Think about whether all of the listed effects (A, B, and C) naturally follow from having a thinner wall, or if one of them might be questionable under normal operating conditions.

✅ Before You Answer

• Compare how heat transfer changes when the conduction path (wall thickness) is reduced • Think about tube metal temperature: with better cooling on the water/steam side, does the metal tend to run hotter or cooler? • Ask whether a thinner wall automatically means decreased probability of tube failure, or whether certain stresses might actually increase, especially at high pressure.

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