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

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

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