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

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
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

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Steam Boilers, Engines, Nozzles and Turbines
Equivalent evaporation of water is the evaporation for a feed water supply at 100°C

Conversion into steam at atmospheric condition
And its corresponding conversion into dry steam at desired boiler pressure
And its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm²
Conversion into steam at the same pressure at which feed water is supplied

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