Prior to turning on the gas supply, plumbers test natural gas or LP gas lines with

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Multiple Choice

Prior to turning on the gas supply, plumbers test natural gas or LP gas lines with

Explanation:
Testing gas lines before turning on the supply is done by pressurizing the piping with air. An air pressure test checks that the system can hold a specified pressure, showing that joints and connections are tight and there are no leaks. If the pressure drops, leaks are present and must be repaired before gas is introduced. The other methods aren’t standard for this purpose: a vacuum test isn’t used for gas piping, water would introduce moisture and potential damage, and soap solution is used to help locate leaks after a proper air pressure test rather than as the primary testing method.

Testing gas lines before turning on the supply is done by pressurizing the piping with air. An air pressure test checks that the system can hold a specified pressure, showing that joints and connections are tight and there are no leaks. If the pressure drops, leaks are present and must be repaired before gas is introduced. The other methods aren’t standard for this purpose: a vacuum test isn’t used for gas piping, water would introduce moisture and potential damage, and soap solution is used to help locate leaks after a proper air pressure test rather than as the primary testing method.

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