How does the diameter of a Cornish boiler fire tube compare to its outer shell__________________?
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Answer: A. one half
Explanation
In a Cornish boiler, the single internal fire tube has a diameter that is approximately one-half of the outer shell. This geometric proportion provides balanced spatial arrangement for internal combustion gases while maintaining adequate water volume. Design standards for shell boilers historically optimized this one-half diameter ratio for structural stability and heat transfer. Cornish boilers are traditional horizontal fire-tube steam generators featuring a single large internal flue running lengthwise. Hot combustion gases pass through the internal fire tube, transferring thermal energy to the surrounding boiler water shell. Shell boiler construction requires careful proportioning of internal tubes to withstand high internal steam working pressures safely.
One-third ratios underestimate the standard internal flue size used in traditional Cornish boiler shell designs. Smaller fractions like one-fifth or two-fifths do not match the established geometric proportions of standard Cornish boilers. Three-fifth ratios overestimate the relative size of the internal fire tube compared to the overall outer cylindrical shell.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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