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NATURAL RESOURCES § 102-192 fluid-operated ram type blowout preventer. Each blowout preventer shall test 5,000 pounds, and its mechanical operation shall be tested daily. All control equipment shall be in good working condition and order at all times. (Ord. No. 1659, § 1(16-15), 8-14-89) Sec. 102-189. Drilling fluid. No well shall be drilled within the city limits without using mud as the drilling fluid after the setting of surface casing as provided in section 102-187. The weight of the mud laden drilling fluid shall be at all times maintained at such weight as will provide a hydrostatic head of not less than 500 pounds per square inch in excess of the formation encountered by the well. In reworking a well, a drilling fluid shall be at all times maintained at such weight as will provide a hydrostatic head of not less than 500 pounds per square inch in excess of the pressure, of the formation penetrated by the well and open for production. (Ord. No. 1659, § 1(16-16), 8-14-89) Sec. 102-190. Drill stem tests. It shall be unlawful and an offense for any person in connection with the drilling or reworking operations of any well within the city limits to take and to complete any drill stem test except during daylight hours,and then only if the well effluent during the test is produced through an adequate oil and gas separator to storage tanks,and the effluent remaining in the drill pipe at the time the tool is closed is flushed to the surface by circulating drilling fluid down the annulus and up the drill pipe. (Ord. No. 1659, § 1(16-17), 8-14-89) Sec. 102-191. Bradenhead. Each well drilled within the city limits shall be equipped with a bradenhead with a working pressure of not less than 3,000 pounds per square inch. Bradenheads shall be cast iron steel premanufactured and welded to the well casing. The bradenhead installed on the surface casing shall be set above the ground level and shall be equipped with fittings having a working pressure rating of not less than 3,000 pounds per square inch.The bradenhead pressure shall be checked at least once each calendar month, and, if pressure is found to exist, proper remedial measures shall be taken immediately to eliminate the source and the existence of the pressure. (Ord. No. 1659, § 1(16-18), 8-14-89) Sec. 102-192. Christmas tree and well head connections. The Christmas tree and all well head connections on each well drilled within the city limits shall have at least a minimum working pressure of 3,000 pounds per square inch, and on all wells completed below a depth of 7,000 feet, the Christmas tree and well head connections shall have at least a minimum working pressure of 3,000 pounds per square inch and a minimum test pressure of at least 5,000 pounds per square inch. All piping and fittings connecting the well head to an oil and gas separator shall have at least the same working CD 102:13