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' 4. All fire hydrants shall be Mueller Super Centurion unless otherwise <br /> noted. <br /> ' 5. All iron parts within fire hydrants shall be ductile iron. <br /> ' 6. The bury length (distance from ground line to insert of the hydrant <br /> inlet) shall be 4'-0" unless ground conditions shown on plans warrant <br /> a deeper bury. <br /> t7. The hydrant main valve shall be 4-1/2" minimum and shall be of the <br /> full compression design, opening against and closing with pressure. <br /> The valve seat ring shall thread into a bronze sub-seat, and all <br /> gaskets sealing the seat ring shall be a bronze-to-bronze surface. <br /> ' 8. Drain valves shall be all bronze and allow complete draining of all <br /> residual water in the hydrant barrel. <br /> ' 9. All bolting and fasteners below ground shall be stainless steel. <br /> ' 10. The operating machine shall utilize two (2) "O"-ring seals between <br /> the revolving nut and bronze-sheathed upper section of the valve <br /> rod. The top of the rod shall also be fitted with a travel stop nut to <br /> limit downward travel of the rod. All-weather grease shall be used to <br /> provide permanent lubrication. A thermoplastic thrust washer shall <br /> be used to reduce friction in the thrust collar while opening the <br /> ' hydrant. <br /> 11. The hydrant inlet shall be mechanical joint. Joint restraint, if <br /> ' specified, shall be accomplished for mechanical joint by use of <br /> mechanical joint gripper glands. <br /> ' D. Air Relief Valve: The air relief valve shall be rated for a working pressure of <br /> 150 psi and hydrostatic test pressure of 300 psi and shall automatically <br /> function to release to atmosphere small amounts of air that accumulate in <br /> ' the pipeline. Once the air has been exhausted, the valve shall seat tightly <br /> to prevent water leakage. <br /> ' E. Manhole Sections and Appurtenances: <br /> 1. Precast concrete manhole bases, risers and cones shall conform to <br /> ' ASTM C478, latest revision, for precast reinforced concrete manhole <br /> sections. Tapered sections and transition sections, where required, <br /> shall be of eccentric cone design, having the same wall thickness <br /> ' and reinforcement as the cylindrical ring sections. Flat slab tops <br /> shall be required for very shallow manholes and where shown or <br /> ' Rev. 10/22/01 PROJECT#13.01126 02640-Page 5 <br />