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

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

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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
Supplied mounted on a single base
Supplied by same manufacturer loose and assembled at site
Purchased from several parties and packed together at site

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