Steam Boilers, Engines, Nozzles and Turbines
Incomplete combustion can be best judged by

Measuring carbon monoxide in flue gases
Excess air in flue gases
Smoky chimney exit
Measuring temperature of flue gases at exit of furnace

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Steam Boilers, Engines, Nozzles and Turbines
Blow off cock in a boiler is used to

Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
Increase the temperature of saturated steam without raising its pressure
Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required

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