MCC-NH Gas Fitters Practice Exam

What is the first step when turning on the gas supply?

1. Notify the user

2. Perform a leak check

3. Adjust the regulator

4. Purge the lines

The correct answer is: Perform a leak check

The first step when turning on the gas supply should be to perform a leak check. This is an essential safety measure to ensure that there are no leaks in the gas supply system before it is activated. Conducting a leak check helps to prevent potential hazards, including explosions or fire, that could result from gas escaping into the environment. Performing a leak check involves inspecting all joints, fittings, and connections for the presence of gas, often using a gas detector or a simple soap solution to identify any escaping gas bubbles. This step is critical in maintaining safety for both the user and the surrounding area, as any leaks identified can be addressed before the gas is fully turned on. While notifying the user, adjusting the regulator, and purging the lines are essential steps in the overall process of safely managing gas supply, they should occur after confirming that the system is leak-free to ensure a safe operation. Ensuring that there are no leaks first allows the gas fitter to proceed with confidence that the system can be safely turned on and used.