Steam Boilers, Engines, Nozzles and Turbines
A fusible plug is fitted in small boilers in order to

Avoid excessive build up of pressure
Avoid explosion
Control steam dome
Extinguish fire if water level in the boiler falls below alarming limit

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Steam Boilers, Engines, Nozzles and Turbines
In an impulse turbine

The pressure and temperature of steam remains constant
The steam is expanded in moving blades only
The steam is expanded both in fixed and moving blades continuously
The steam is expanded in nozzles only and there is a pressure drop and heat drop

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

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

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Steam Boilers, Engines, Nozzles and Turbines
In forced circulation type boiler

Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
Feed pump is employed to supplement natural circulation in water wall type furnace
Water is converted into steam in one pass without any recirculation
Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

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