What safety feature prevents explosions in a chlorine tank when excessive pressure builds up?

The fusible plug is a critical safety feature designed to prevent explosions in chlorine tanks when excessive pressure builds up. It operates based on a specific material that has a low melting point. When the pressure inside the tank rises to dangerous levels, it can generate significant heat. This heat can cause a rise in the temperature of the chlorine gas, further increasing the internal pressure.

The fusible plug melts at a predetermined temperature, creating a deliberate failure point that allows the gas to escape safely. By venting the excess pressure in a controlled manner, the fusible plug helps to prevent catastrophic failures, such as explosions, that could occur if the pressure were to continue to rise unchecked.

In contrast, other features such as valve seat adjustments and check valves serve different purposes. Valve seat adjustments may help regulate flow but do not specifically address pressure buildup. A heat reducing valve functions by controlling temperature but is not solely responsible for relieving pressure. A check valve can prevent backflow but does not mitigate pressure issues in a tank. Therefore, the fusible plug is the most effective choice for addressing the safety concerns associated with excessive pressure in chlorine tanks.