Steam Boilers, Engines, Nozzles and Turbines
The function of a safety valve is

None of these
To indicate the water level inside the boiler to an observer
To measure pressure of steam inside the steam boiler
To blow off steam when the pressure of steam inside the boiler exceeds the working pressure

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Steam Boilers, Engines, Nozzles and Turbines
In designing air preheaters, the important design consideration is that

Stack gases should not be cooled to the dew point
Heat transfer area should be optimum
Approach temperature should be as low as possible
Handling and maintenance should be easier

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