Steam Boilers, Engines, Nozzles and Turbines
Boiler stays are used to

Prevent flat surfaces under pressure from tearing apart
Provide support for boiler
Take care of failure in shear
Take care of failure in compression

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Steam Boilers, Engines, Nozzles and Turbines
When the inlet pressure of steam is equal to the exit pressure, then

Pressure drops and fluid flows through the nozzle
There is no pressure drop and fluid does not flow through the nozzle
Fluid flows through the nozzle
There is a pressure drop in the nozzle

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