After isolating a section of gas piping, what is the proper verification to confirm the valve is fully closed?

After isolating a section of gas piping, what is the proper verification to confirm the valve is fully closed?

• A. Close the valve and verify the indicator, and perform a pressure test or implement a tag-out.
• B. Simply rely on sight of the valve handle.
• C. Open a different valve to balance flow.
• D. Ignore verification if no leak is observed.

Answer: (A)