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

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

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Steam Boilers, Engines, Nozzles and Turbines
The object of producing draught in a boiler is

To discharge the gases of combustion to the atmosphere through the chimney
To exhaust the gases of combustion from the combustion chamber
All of the listed here
To provide an adequate supply of air for the fuel combustion

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