Steam Boilers, Engines, Nozzles and Turbines
Fire tube boilers are those in which

Water passes through the tubes and flue gases around it
Forced circulation takes place
Flue gases pass through tubes and water around it
Tubes are laid vertically

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Steam Boilers, Engines, Nozzles and Turbines
The function of a flywheel is

To convert reciprocating motion of the piston into rotary motion
To convert rotary motion of the crankshaft into to and fro motion of the valve rod
To prevent fluctuation of speed
To keep the engine speed uniform at all load conditions

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