Which equipment is necessary to perform a gas line pressure test?

To perform a gas line pressure test, it is essential to have a pressure gauge and proper fittings to ensure that the gas line is securely sealed. The pressure gauge measures the pressure in the line, allowing you to determine if there are any leaks present. Proper fittings are critical for creating a complete seal at the connection points of the gas line, which is necessary to accurately assess the system's integrity under pressure. Without these components, the test could yield unreliable results, and risks could arise from undetected leaks.

The other options lack the necessary tools and equipment. An adjustable wrench is useful for tightening connections but does not measure pressure or seal the line. A standard thermometer is not relevant for a pressure test since it does not relate to measuring or maintaining pressure. Lastly, pressure relief valves play a different role in the system, primarily in safety and preventing overpressure, and are not used directly in performing the pressure test itself.