What should you do if it is not possible to shut off the gas supply during a piped gas leak fire and the gas is limited?

When faced with a situation where it is not possible to shut off the gas supply during a piped gas leak fire, allowing the flame to burn itself out while calling 911 is the safest course of action. This approach minimizes the risk of explosion or other hazards that could arise from attempting to extinguish the fire aggressively.

By allowing the flame to burn, you reduce the possibility of creating a more dangerous situation, especially if the gas continues to leak. Emergency responders are trained to handle gas fires and can take appropriate measures to ensure safety once they arrive.

It's important to remember that interrupting a gas fire can potentially lead to an explosion if the gas concentration becomes too high in a confined space or if the fire is suddenly extinguished without stopping the flow of gas. Therefore, letting it burn down while summoning professional help is the wisest choice in this scenario.