This document is a seminar presentation about fusible plugs. It discusses what a fusible plug is, which is a threaded cylinder with a tapered hole sealed by a low melting point metal. Fusible plugs are used as overheating protection devices in fluid couplings, melting at around 130-140°C to disconnect the coupling and prevent damage. The document outlines the uses of fusible plugs in aircraft wheels and their advantages of being simple and cost-effective fire protection. However, their disadvantages are that rust can raise the melting point and some may fail to activate at high temperatures, and they are slower than heat detectors.

1. SENTHUR POLYTECHNIC COLLEGE
DEPARTMENT OF MECHANICAL ENGINEERING
4020520/ THERMAL ENGINEERING II
SEMINAR PRESENTATION
Submitted by
S E M I N A R T O P I C
F U S I B L E P L U G E
S U B M I T T E D B Y
M U H A M M E D S A R F A N . H
2 2 2 1 6 3 0 5

2. Fusible plug
A fusible plug is a threaded cylinder of metal usually of bronze, brass
or gunmetal, 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.

3. Fusible plug is a fluid coupling overheating protection device, is one of the
essential components, coupling the brake or overload, the maximum torque of
about 2 to 2.5 times the rated torque, or higher. So heating power will work to
fight a sharp rise in oil temperature and oil near the flashpoint work, but causes
severe vibration coupling products, will cause the working oil fire, even causing
serious consequences coupling damage, but the installation fusible Cypriot later,
as long as the working oil temperature close to 134 °C, fusible plug in low melting
fusible alloy will melt (melting point of about 130 140 °C), working oil under the
effect of centrifugal force, ejected from the fusible plug, so that the active part is
completely disconnected, no torque is transmitted, thereby protecting the
coupling and the driven machinery. At this point you must find the cause of the
injector troubleshooting, according to the provisions of the re-injected into oil-
filled amount of working oil and put on the same specifications as the original
fusible plug, or re-poured into the low melting point alloy, while the re-check all
bolts on the coupling circumference tightening once. Thus fusible plug plays an
important role, not allow to replace the bolt with a solid fusible plug

5. Uses of fusible plug
A fusible plug operates as a safety valve when dangerous
temperatures, rather than dangerous pressures, are reached in a
closed vessel. Fusible plugs are commonly installed in aircraft wheels,
most typically in those of larger or high-performance aircraft.

6. Advantages of fusible plug
• Fusible plugs are simpler and don’t require any maintenance.
• Fire protection can be provided in a surrounding fusible plug radial
field.
• The system is very cost-effective.

7. Disadvantages of fusible plug
Formation of rust conditions can increase the melting point of the
metal, which does not react when heated. Some fuse plugs fail to
activate even after being exposed to higher temperatures. Fusible
plug system is slower than heat detectors

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