Steam Boilers, Engines, Nozzles and Turbines
Steam in water tube boiler as compared to fire tube boiler

Is raised at same rate
Can be raised rapidly
Could be raised at fast/slow rate depending on design
Is raised at slower rate

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Steam Boilers, Engines, Nozzles and Turbines
The power of a boiler may be defined as

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

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