What precaution is necessary for the opening of a gas cylinder valve?

Checking for leaks before opening a gas cylinder valve is a crucial safety precaution to prevent potential hazards associated with gas leaks. When gas cylinders are opened, there is a risk that gas may escape, which can lead to fires, explosions, or exposure to toxic gas. By inspecting for leaks beforehand—usually through methods such as soapy water tests or using a leak detection solution—workers can identify any issues that may pose safety threats. This proactive measure ensures a safer working environment not only for the individual handling the cylinder but also for others nearby.

While other precautions are important in their own right—such as keeping the cylinder upright to ensure stability, pointing the outlet away from people to prevent accidental gas exposure, and opening the valve slowly to regulate the release of gas—checking for leaks is the foundational step taken to ensure safety before any further actions are performed with the gas cylinder.