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r <br /> 3 . Fittings <br /> a . All underground fittings shall be either bell and spigot, or mechanical joint. <br /> r Mechanical joints shall conform to AWWA Specification C110 (ANSI 21 . 10-87), or <br /> latest revision . All aboveground fittings shall be flanged joint. <br /> b . The pressure rating shall be 250 psi for fittings up to 12" and a minimum of 150 psi for <br /> larger sizes. <br /> r c. All fittings shall be lined with the same material as specified for the pipe as discussed <br /> in the lining and coating section. <br /> r 4. Lining and Coating <br /> a. Unless otherwise indicated, all ductile iron pipe shall be factory lined and coated . <br /> i <br /> b. Lining : All pipe shall be cement mortar lined and seal coated in accordance with <br /> AWWA Standard C104 (ANSI A21 .4-85) , or latest revision. <br /> r c . Coating : pe Unless specified otherwise, all <br /> pipe shall be bituminous coated outside to a <br /> dry film thickness of at least 1 mil. <br /> d. Repair. Anywhere that the coating is removed purposely or accidentally, the area <br /> shall be cleaned of any rust, grease, and recoated to a minimum dry film as specified <br /> for the individual piece. <br /> r <br /> e. Encasement: If and where directed by IRCDUS , a polyethylene encasement shall be <br /> provided over pipe, fittings, and valves. The material, installation, and workmanship <br /> r shall conform to applicable sections of AWWA C105 (ANSI A21 .5-88), or latest <br /> revision. Installation methods A or B shall be employed using flat tube polyethylene . <br /> The Contractor shall make provisions to keep the polyethylene from direct exposure <br /> r to sunlight prior to installation, and backfilling following installation shall be completed <br /> without delay to avoid exposure to sunlight. <br /> r 5 . Bell and Spigot Connections <br /> Joints in bell and spigot pipe shall be push-on, mechanical, or restrained joints in <br /> accordance with AWWA Standard C-111 (ANSI 21 . 11 -85), or latest revision. <br /> Mechanical joint pipe set screw type retainer glands will be permitted on a case-by-case <br /> basis, when restrained mechanical joints, in accordance with AWWA Standard 0-111 <br /> (ANSI 21 . 11 -85), or latest revision, are Impractical. Thrust blocks may be required by <br /> • IRCDUS in cases where retainer glands are used. <br /> 6. Flanged Connections <br /> a. All flanged pipe barrels shall comply with the physical and chemical requirements as <br /> set forth in the Handbook of Ductile Iron Pipe of the Cast Iron Pipe Research <br /> r Association. Flanges shall be in accordance with ANSI Specification B16.1 for Class <br /> 125 flanges. Bolts shall comply with ANSI Specification 818.2. <br /> i <br /> r <br />