What is the typical diameter size for fire tubes in a Cochran boiler___________________?
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Answer: B. 6 Cm ,
Explanation
Cochran boilers are vertical fire-tube steam generators widely used for small and medium industrial loads. The internal heating surface consists of numerous small fire tubes through which hot combustion gases pass. Standard design specifications for these internal fire tubes establish a typical diameter of approximately six centimeters. Fire-tube boilers route hot combustion gases inside tubes surrounded by water contained in a large shell. Vertical boilers like the Cochran design are chosen for their compact footprint in restricted spaces. Natural circulation of water around the fire tubes ensures effective heat transfer to generate steam.
Small industrial plants and marine applications historically utilized Cochran boilers for reliable steam supply. Boiler operators monitor tube cleanliness to prevent soot buildup that reduces heat transfer efficiency. Regular inspection of fire tubes ensures safe operation under high internal steam pressures. Option A specifies a tube diameter that is too small to handle adequate flue gas flow efficiently. Option C suggests an eight centimeter diameter, exceeding the standard Cochran fire tube dimensions. Option D describes tubes that are too large, which would reduce the total internal heat transfer area.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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