Steam Boilers, Engines, Nozzles and Turbines
The function of a piston rod is

To convert heat energy of the steam into mechanical work
To exhaust steam from the cylinder at proper moment
To transfer motion from the piston to the cross head
To guide motion of the piston rod and to prevent it from bending

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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

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

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