What should be done immediately after conducting the operating pressure test?

The appropriate action to take immediately after conducting the operating pressure test is to close up the gas cock. This step is critical for ensuring safety and preventing gas from escaping after the test has been completed. Closing the gas cock helps to secure the system and minimizes the risk of any potential hazards, such as gas leaks, which could occur if the gas remains open.

While documenting test results, inspecting connections, and calibrating the pressure gauge are all important components of the testing process, they are not the immediate priority right after the pressure test. Closing the gas cock ensures that the system is safe and stable before any further actions are taken. Therefore, it is essential to prioritize safety by sealing off the gas supply promptly after the test.