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Li ON 3. Fittings a. All underground fittings shall be either bell and spigot, or mechanical joint. r Mechanical joints shall conform to AWWA Specification C110 (ANSI 21.10-87), of latest revision. All aboveground fittings shall be flanged joint. b. The pressure rating shall be 250 psi for fittings up to 12" and a minimum of 150 psi for larger sizes. r c. All fittings shall be lined with the same material as specified for the pipe as discussed in the lining and coating section. W 4. Lining and Coating a. Unless otherwise indicated, all ductile iron pipe shall be factory lined and coated. r b. Lining: All pipe shall be cement mortar lined and seal coated in accordance with AWWA Standard C104 (ANSI A21.4-85), or latest revision. r c. Coating: pe Unless specified otherwise, all pipe shall be bituminous coated outside to a dry film thickness of at least 1 mil. d. Repair. Anywhere that the coating is removed purposely or accidentally, the area shall be cleaned of any rust, grease, and recoated to a minimum dry film as specified for the individual piece. r e. Encasement: If and where directed by IRCDUS, a polyethylene encasement shall be provided over pipe, fittings, and valves. The material, installation, and workmanship r shall conform to applicable sections of AWWA C105 (ANSI A21.5-88), or latest revision. Installation methods A or B shall be employed using flat tube polyethylene. The Contractor shall make provisions to keep the polyethylene from direct exposure r to sunlight prior to installation, and backfilling following installation shall be completed without delay to avoid exposure to sunlight. r 5. Bell and Spigot Connections Joints in bell and spigot pipe shall be push -on, mechanical, or restrained joints in accordance with AWWA Standard C-111 (ANSI 21.11-85), or latest revision. Mechanical joint pipe set screw type retainer glands will be permitted on a case-by-case basis, when restrained mechanical joints, in accordance with AWWA Standard 0-111 (ANSI 21.11-85), or latest revision, are Impractical. Thrust blocks may be required by • IRCDUS in cases where retainer glands are used. 6. Flanged Connections a. All flanged pipe barrels shall comply with the physical and chemical requirements as set forth in the Handbook of Ductile Iron Pipe of the Cast Iron Pipe Research r Association. Flanges shall be in accordance with ANSI Specification B16.1 for Class 125 flanges. Bolts shall comply with ANSI Specification 818.2.