Correct Answer - Option 1 : 4 to 8 m
Explanation:
Boiler is a closed vessel in which steam is produced from water by combustion of fuel.
Classifying the boiler on the basis pressure we have: high-pressure and low-pressure boilers.
High pressure boiler
The boilers which produce steam at pressures of 80 bar or above.
Example: Babcock and Wilcox, Velox, Lamont, Benson boilers.
Low pressure boilers
The boilers which produce steam at pressures below 80.
Example: Cochran, Cornish, Lancashire and Locomotive boilers.
Cornish boiler specifications
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No. of flue tubes
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1
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Diameter of the shell
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1.25 – 1.75 m
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Length of the shell
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4 – 7 m
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Pressure of steam
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10.5 bar
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Steam capacity
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6500 Kg/hr
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