Fusible plug
for a steam boiler is an alloy consisting of bismuth, lead and:
Tin
Copper
Aluminium
Zinc
Tin
A fusible
plug is a threaded metal cylinder usually of alloy consisting
Bismuth, lead and tin with a tapered hole drilled completely through its
length. This hole is sealed with a metal of low melting point that
flows away if a pre-determined, high temperature is reached.
Hence, the correct option is (A).
&Key Points:-
When
the steam temperature reaches the melting point of the fusible plug,
plug melts and sends the steam out through the plug hole. This
escaped steam avoided over pressure in the steam boiler vessel which
eliminated the risk of burst in steam boilers.
Fire-activated fusible
plugs are filled with pure tin and feature a melting point between 445 and 450 0F.
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