Steam Boilers, Engines, Nozzles and Turbines
The function of an eccentric rod is

To provide simple harmonic motion to the D-slide valve
To convert reciprocating motion of the piston into rotary motion of the crank
To convert rotary motion of the crankshaft into to and fro motion of the valve rod
To provide reciprocating motion to the slide valve

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Steam Boilers, Engines, Nozzles and Turbines
In a single acting steam engine

The steam is admitted, in turn, on both sides of the piston and one working stroke is produced during each revolution of the crankshaft
The steam is admitted on one side of the piston and two working strokes are produced during each revolution of the crankshaft
The steam is admitted, in turn, on both sides of the piston and two working strokes are produced during each revolution of the crankshaft
The steam is admitted on one side of the piston and one working stroke is produced during each revolution of the crankshaft

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Steam Boilers, Engines, Nozzles and Turbines
Boiler H.P. is defined as the

Steam evaporation rate per kg of fuel fired
Work done in evaporating 1 kg of steam per hour from and at 100°C into dry saturated steam
The evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam
Work done by 1 kg of steam at saturation condition

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Steam Boilers, Engines, Nozzles and Turbines
In designing air preheaters, the important design consideration is that

Approach temperature should be as low as possible
Heat transfer area should be optimum
Stack gases should not be cooled to the dew point
Handling and maintenance should be easier

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