What critical step should be taken after installation of new gas lines?

After the installation of new gas lines, conducting a pressure test to ensure there are no leaks is an essential step. This process involves filling the gas lines with air or another non-flammable gas and monitoring for any drop in pressure, which would indicate a leak. Ensuring the integrity of the gas lines is crucial for safety, as leaks can lead to dangerous situations, including explosions or gas buildup in enclosed spaces.

While installing safety valves, painting the pipes, or insulating them are important maintenance and safety steps, they do not directly address the immediate necessity of confirming that the gas lines are properly sealed and free from leaks. If leaks are present, any further actions could pose significant risks, making the pressure test the top priority following installation.