As shown in the illustrated D type single...

Question 1 of 2707066636ef128f7522a1c52373f

As shown in the illustrated D type single furnace boiler, what does item "H" represent? Illustration SG-0008

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Question 1 of 27070

As shown in the illustrated D type single furnace boiler, what does item "H" represent? Illustration SG-0008

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🔍 Key Concepts

• Trace the gas flow path from furnace to stack in a D‑type boiler and note where the hottest gases pass first. • Recall where an integral superheater, economizer, and air heater are normally located relative to the steam drum and gas uptake. • Think about which of the listed components actually sits inside the boiler gas path versus out in the steam piping (like a desuperheater).

💭 Think About

• Follow the arrows and gas path in the illustration: is item "H" located where steam, feedwater, or combustion air would logically flow? • Compare the tube arrangement at "H" with the dense tube banks at the rear of the boiler: which service (steam, feedwater, or air) typically uses a small, tightly curved tube bundle up high near the steam drum? • Ask yourself: which of the answer choices would most likely be exposed to the highest gas temperatures, right after the gases leave the furnace?

✅ Before You Answer

• Verify whether item "H" is connected directly to the steam drum or to external ducting/piping for air or feedwater. • Check if any fans or external ducts are attached to "H" (which would suggest an air heater) or if it is simply a tube bank in the gas path. • Confirm that a desuperheater is usually located in the steam line (with water injection) and not drawn as a gas‑side tube bank inside the boiler casing.