A. The Christmas tree and all wellhead connections on each well drilled within the city shall be as follows:
1. On all flowing wells completed at a depth above four thousand feet (4,000'), the Christmas tree and wellhead connections shall have at least a minimum working pressure of two thousand (2,000) pounds per square inch and a minimum test pressure of at least four thousand (4,000) pounds per square inch.
2. On all wells completed to a depth of from four thousand one (4,001) to seven thousand feet (7,000'), the Christmas tree and wellhead connections shall have at least a minimum working pressure of three thousand (3,000) pounds per square inch and a minimum working pressure of three thousand (3,000) pounds per square inch and a minimum test pressure of at least six thousand (6,000) pounds per square inch.
3. On all wells completed below a depth of seven thousand feet (7,000'), the Christmas tree and wellhead connections shall be at least a minimum working pressure of five thousand (5,000) pounds per square inch and a minimum test pressure of at least ten thousand (10,000) pounds per square inch.
B. All piping and fittings connecting the wellhead to an oil gas separator shall have at least the same minimum working pressure and minimum test pressure as hereinabove specified for Christmas tree and wellhead connections. In the event the surface shut-in pressure of any well in the city exceeds two thousand (2,000) pounds per square inch, the flow wing of the Christmas tree shall be equipped with an automatic closing safety valve in addition to the regular control valves. (1991 Code § 14-14)