Sprinkler systems may be permitted to be attached to the water mains by direct connection without meters under the direction and supervision of the City Engineer. No open connection can be incorporated in the system, and there shall be no valves except a main control valve at the entrance of the building which must be sealed open. The owner of the property shall promptly report to the Water Department whenever said seal has been broken for the closing of the system. A diagram of such sprinkler system must be filed with the City Engineer and free access to all parts of said system must be granted to the Water Department. No charge shall be made for water used for fire purposes through a sprinkler system. (Ord. 88-8, 5-2-1988; amd. Ord. 90-27, 12-18-1990; Ord. 91-3, 2-5-1991; 2017 Code)