Steam Boilers, Engines, Nozzles and Turbines
The Locomotive boiler has

147 fire tubes and 34 superheated tubes
137 fire tubes and 44 superheated tubes
157 fire tubes and 24 superheated tubes
167 fire tubes and 14 superheated tubes

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Steam Boilers, Engines, Nozzles and Turbines
In water tube boilers

Forced circulation takes place
Water passes through the tubes which are surrounded by flames and hot gases
The flames and hot gases pass through the tubes which are surrounded by water
None of these

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