Steam Boilers, Engines, Nozzles and Turbines
Locomotive boiler is a

Single tube, vertical, externally fired and stationary boiler
Multi-tubular, horizontal, internally fired and mobile boiler
Multi-tubular, horizontal, externally fired and stationary boiler
Single tube, horizontal, internally fired and stationary boiler

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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

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

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Steam Boilers, Engines, Nozzles and Turbines
In recuperative air preheaters, the heat is transferred

Heat is transferred by bleeding some gases from furnace
From a metal wall from one medium to another
From heating an intermediate material and then heating the air from this material
By direct mixing

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