Steam Boilers, Engines, Nozzles and Turbines
Willian’s line follows the law (where b = A constant representing the shape of the Willian’s line, a = Another constant i.e. no load consumption per hour, I.P. = Indicated power, and m = Steam consumption per hour)

I.P. = b × m + a
m = (b/I.P.) - a
m = a + b × I.P.
I.P. = a × m + b

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Steam Boilers, Engines, Nozzles and Turbines
The equivalent evaporation is defined as

The ratio of heat actually used in producing the steam to the heat liberated in the furnace
The amount of water evaporated from and at 100°C into dry and saturated steam
The amount of water evaporated or steam produced in kg per kg of fuel burnt
The evaporation of 15.653 kg of water per hour from and at 100°C

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