§ A182-3. Laying pipe.
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A.
All cast-iron pipes shall be laid in accordance with AWWA Standard C-600. All pipes, fittings and valves shall be carefully handled to avoid damage and, while they are suspended over the trench, before lowering, they shall be rung and inspected for defects. Before the pipe is laid, all lumps, blisters, excess coal tar, dirt, oil, grease and moisture shall be removed from inside the pipe. After pipe is laid, care shall be taken to avoid the entrance of dirt or water from the trench by use of tight bulkheads. The handling of material shall conform to Section 2.2 of AWWA Standard C-600.
B.The pipe shall be laid to conform to lines and grades shown on the plans or as directed by the Engineer. The pipe shall have a minimum cover of four feet six inches unless noted otherwise on the drawings.
Each bell and spigot shall be cleaned with a wire brush. Each pipe and special fitting shall be firmly supported on good foundations. Mechanical and rubber gasket pipe joints shall be made in strict accordance with manufacturer's instructions. Where bolts are used, they shall be drawn up evenly with a torque wrench.Editor's Note: The drawings are included at the end of this chapter.C.Excavation and preparation of the trench shall be in accordance with AWWA C-600, as applicable. The bottom of the trench shall be carefully graded and bell holes cut to receive the bell of the pipe.
D.After laying and inspecting the pipe, each length shall be carefully backfilled by placing approved material free from stone around the pipe. Backfill shall be thoroughly compacted and tamped in six-inch layers so as to securely hold the pipe in place, but not tamped to cause movement of the pipe. This careful placing shall continue until a minimum of one foot of earth has been placed and tamped over the top of the pipe. From one foot above the pipe to the grade shown on the drawings
or fixed by the Engineer, the trench shall be backfilled and tamped by hand or approved mechanical methods. Backfill under permanent pavement, curbs, driveways or sidewalks shall be made with sand, run-of-bank gravel or other approved materials and shall conform to AWWA Standard C-600, Section 3.5. Removal, restoration and maintenance of surface shall be made in accordance with AWWA Standard C-600, Section 3.2.Editor's Note: The drawings are included at the end of this chapter.