A sectional (sinuous) header boiler is classified as which type?

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Multiple Choice

A sectional (sinuous) header boiler is classified as which type?

Explanation:
Sectional header designs use many short tubes that run straight between end headers, forming a long serpentine gas path. The key point is that the tubes themselves are straight, even though the header arrangement makes the path look winding. So this type is classified as a straight-tube boiler. The sinuous header describes how the path is laid out, not curved tubes, which is why the correct label focuses on the straight-tube construction. The other options don’t match the tube geometry being described.

Sectional header designs use many short tubes that run straight between end headers, forming a long serpentine gas path. The key point is that the tubes themselves are straight, even though the header arrangement makes the path look winding. So this type is classified as a straight-tube boiler. The sinuous header describes how the path is laid out, not curved tubes, which is why the correct label focuses on the straight-tube construction. The other options don’t match the tube geometry being described.

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