What happens when a fusible plug melts?

When a fusible plug melts, it serves as a safety device designed to prevent potentially hazardous situations, such as explosions, due to excessive pressure build-up within a gas cylinder. The fusible plug is made from a material that has a low melting point and is strategically placed in the cylinder. When temperatures rise to a certain level, typically because of a fire or extreme heat, the fusible plug melts, which opens a pathway for gas to escape.

This controlled release of gas is critical because it helps to relieve pressure within the cylinder, mitigating the risk of rupture or explosion. By allowing the gas to escape, the fusible plug effectively acts as a relief mechanism, safeguarding people and property in the vicinity. Therefore, the melting of the fusible plug is a crucial action designed to enhance safety and prevent catastrophic failures associated with gas storage.