Steam Boilers, Engines, Nozzles and Turbines
A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are

Supplied by same manufacturer loose and assembled at site
Packaged boiler does not exist
Supplied mounted on a single base
Purchased from several parties and packed together at site

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

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

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