What action should be taken if a propane cylinder is found to be leaking?

If a propane cylinder is found to be leaking, the action of closing the service valve is the appropriate step to take. Closing the service valve helps to stop the flow of gas from the cylinder, potentially preventing further gas from escaping into the environment. This is a crucial first step in mitigating the risk of fire or explosion, as stopping the leak helps control the situation more effectively.

While it is important to act swiftly, other actions such as using water to cool the cylinder could inadvertently exacerbate the situation by introducing additional hazards. Moving the cylinder indoors is also unsafe, as it could lead to gas accumulation in an enclosed space, creating a serious risk of explosion. Informing the local fire department is necessary but should be done after first attempting to secure the cylinder by closing the valve. Addressing the leak by shutting the valve is critical as it directly handles the immediate danger posed by the leak.