What is the best response when a closed pressure container, such as a liquefied gas tank, begins to expand due to heating?

The best response when a closed pressure container, such as a liquefied gas tank, begins to expand due to heating is to isolate the container from all civilians and fire department personnel. This action is critical because the primary concern with such pressure containers is the potential for an explosion due to the buildup of pressure as the temperature increases.

By isolating the area, you create a safety perimeter that minimizes the risk of injury to personnel and civilians. It prevents the possibility of anyone being caught in the hazardous effects of an explosion, should it occur.

While cooling the container with water could theoretically help, it requires careful consideration and expertise, making direct action without proper assessment risky. Natural cooling may not happen fast enough to prevent a dangerous situation, and evacuation, while essential in many scenarios of hazardous material incidents, does not address the immediate risk associated with the pressure increase. Isolation stands out as the most prudent first step to protect everyone in the vicinity while allowing firefighters to assess and manage the situation safely.