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

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

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Steam Boilers, Engines, Nozzles and Turbines
For water, at pressures below atmospheric;

Melting point rises markedly and boiling point drops markedly
Melting point drops slightly and boiling point drops markedly
Melting point rises slightly and boiling point drops markedly
Melting point drops slightly and boiling point drops slightly

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Steam Boilers, Engines, Nozzles and Turbines
Equivalent evaporation of water is the evaporation for a feed water supply at 100°C

And its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm²
And its corresponding conversion into dry steam at desired boiler pressure
Conversion into steam at the same pressure at which feed water is supplied
Conversion into steam at atmospheric condition

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