(A) A rough piping inspection shall be made after all new piping authorized by the permit has been installed, and before any such piping has been covered or concealed or any fixtures or gas appliances have been attached thereto.
(B) A final piping inspection shall be made after all piping authorized by the permit has been installed and after all portions thereof which are to be concealed by plastering or otherwise have been so concealed, and before any fixtures or gas appliances have been attached thereto. This inspection shall include a pressure test, at which time the piping shall stand an air pressure equal to not less than the pressure of a column of mercury six inches in height, and the piping shall hold this air pressure for a period of at least ten minutes without any perceptible drop. A mercury column gauge shall be used for the test. All tools, apparatus, labor and assistance necessary for the test shall be furnished by the installer of such piping.
(2011 Code, § 12-308)