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i PART 3: EXECUTION 2 3 3.01 INSTALLATION 4 5 A. Bell and Spigot Ductile Iron Pipe: Where bell and spigot joints are used for joining ductile 6 iron pipe, the joints shall be made using rubber rings, U.S. "Tyton", Clow "Super Bell-Tite" ' 7 joint, or equal. Gasket seat, gasket, and spigot shall be thoroughly cleaned before 6 assembly of joint. The entire procedure shall be in strict accordance with manufacturer's 9 recommendations. 10 11 B. Mechanical Joint Ductile Iron Pipe: Mechanical joints in ductile iron pipe shall be made as 12 follows: Gland shall be placed on spigot end of pipe with lip extension toward the joint. 13 The rubber gasket shall then be slipped on the pipe with its thick edge toward the gland. 14 The gasket and joint surfaces shall then be thoroughly wetted using a soapy solution made 15 with vegetable soap or similar soap as recommended by the manufacturer. The spigot end 16 of the pipe shall then be inserted to full depth of the mechanical joint socket and the ' 17 gasket pressed firmly into place in the bell in order to obtain an even "set" all around the 16 joint. The gland shall then be moved into place, the bolts inserted and the nuts taken up 19 tightly with fingers. The nuts shall then be tightened gradually by wrench -- a half turn at ' 20 a time, moving wrench from one nut to another repeating until all nuts are uniformly tight. 21 Final tightness shall be with a torque wrench as follows: three-quarter inch bolts - 60 to 90 22 pounds torque. 23 1 24 C. Flanged Pipe: Flanged joints shall be made up square, with even pressure on the gaskets, 25 and shall be watertight. 26 27 D. Grooved Coupling: Grooved couplings shall be prepared or painted as necessary to obtain 26 a leak-free seal. 29 3o E. Polyethylene Encasement for External Corrosion Protection for Buried Piping: ' 31 32 1. General: Provide 8 mil polyethylene encasement on all buried ductile iron pipe. 33 34 2. Installation on Pipe 35 36 a. Pick up the pipe with a sling or pipe tongs. Slip a polyethylene tube which is ' 37 approximately two feet longer than the pipe over the plain end and leave it 36 bunched up accordion style. 39 40 b. Lower the pipe into the trench and make up the joint with the preceding pipe. 41 Shallow bell holes are required to allow overlap of the tube at the joints. 42 43 c. Remove the sling or tong from the center of the pipe, raise the bell a few inches 44 and slip the polyethylene tube along the pipe barrel, leaving approximately one 45 foot of the tube bunched up at each end of the pipe for wrapping the joints. 46 ' 47 d. Overlap each joint by first pulling one bunched-up tube over the bell, folding 1t 4e around the adjacent plain end, and securing it in place with two or three wraps 49 of the polyethylene adhesive tape. Complete the overlap by repeating the same 50 procedure with the bunched-up tube on the adjacent pipe. 51 DUCTILE IRON PIPE 050694 150423