What should be done with factory installed plugs before conducting the pre-installation air/soap test?

Before conducting the pre-installation air/soap test on underground storage tanks (USTs), it is essential to ensure that all factory-installed plugs are properly prepared. Applying sealant or pipe dope to these plugs is the best approach because it helps to create a tight seal, preventing any air or soap solution from escaping during the test. This step is crucial for the accuracy of the test results, as leaks can lead to false readings, potentially resulting in unnecessary repairs or safety concerns.

Sealant or pipe dope adds an additional layer of protection against leaks, ensuring that the testing process accurately reflects the integrity of the system. This preparation helps verify that the UST will function correctly and safely after installation.

In contrast, completely removing the plugs could expose the system to contaminants and air, compromising the testing process. Leaving the plugs untouched would not address any potential issues with sealing, while only tightening them might not achieve the necessary seal integrity without the additional barrier provided by sealant or pipe dope.