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

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

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