What is a common method for testing a gas line prior to service?

What is a common method for testing a gas line prior to service?

• A. Hydrostatic testing with water.
• B. Visual inspection only.
• C. Pressure testing (per Code requirements) using air or inert gas.
• D. Pneumatic testing with natural gas.

Answer: (C)

Testing gas piping before it goes into service focuses on proving the line can hold a specified pressure without leaks. The common method is a pressure test conducted per Code requirements using air or an inert gas. This approach lets you pressurize the system, watch for any drop in pressure over the required period, and detect leaks without introducing liquids that could cause corrosion or require extensive cleanup. After the test, you purge the test medium and bring the line into service. Visual inspection alone cannot reveal hidden leaks or weak joints, and while hydrostatic (water) testing is used in some piping situations, it’s not the typical method for gas lines due to practicality and compatibility with gas systems. Pneumatic testing with natural gas is hazardous and generally not permitted.

Testing gas piping before it goes into service focuses on proving the line can hold a specified pressure without leaks. The common method is a pressure test conducted per Code requirements using air or an inert gas. This approach lets you pressurize the system, watch for any drop in pressure over the required period, and detect leaks without introducing liquids that could cause corrosion or require extensive cleanup. After the test, you purge the test medium and bring the line into service. Visual inspection alone cannot reveal hidden leaks or weak joints, and while hydrostatic (water) testing is used in some piping situations, it’s not the typical method for gas lines due to practicality and compatibility with gas systems. Pneumatic testing with natural gas is hazardous and generally not permitted.