What feature must a LHG emergency shutoff system have if it uses a piping system for flammable LHG?

The correct feature that a liquefied hazardous gas (LHG) emergency shutoff system must have when utilizing a piping system for flammable LHG is the inclusion of fusible elements that melt at temperatures less than 105 degrees Celsius (221 degrees Fahrenheit).

Fusible elements are critical because they provide a thermal response mechanism that automatically triggers a shutdown of the system during a fire or other heat-related incident. When exposed to high temperatures, these elements will melt and cause a valve to close, thereby stopping the flow of flammable gas and reducing the risk of an explosion or fire that could occur if the gas continued to leak into the environment.

The melting point specified (below 105 °C) ensures the shutoff is effectively activated during early stages of a fire, providing valuable time for emergency response teams to take action. This feature is particularly crucial in environments where high temperatures can quickly pose severe hazards.

While other options may complement safety measures in certain scenarios, they do not specifically cater to the urgent need for an automatic thermal response in the event of a fire. Automatic valves that close at high pressure, for example, are beneficial for overpressure situations but do not mitigate risks directly associated with fire exposure. Manual overrides offer an element of control but