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Piping, including process piping, that is installed in trenches, shall be inspected prior to backfilling.

Related Code Sections

404.17 Gas Piping Installations, Testing of Piping
Before any system of piping is put in service or concealed, it shall be tested to ensure that it is gas tight. Testing, inspection and purging ...
404.20 Gas Piping Installations, Testing of Piping
Before any system of piping is put in service or concealed, it shall be tested to ensure that it is gas tight. Testing, inspection and purging ...