Before any system of gas piping is finally put in service, it shall be carefully tested to assure that it is gaslight. Where any part of the system is to be enclosed or concealed, this test should precede the work of closing in. To test for tightness the piping may be filled with City gas, air or inert gas but not with any other gas or liquid. In no case shall oxygen ever be used. The piping must stand a pressure of ten pounds per square inch for a period of not less than ten minutes without showing any drop in pressure.
(Ord. 368.Passed 8-4-50.)