2009 Wildwood Water Utility Specifications
Water mains shall be laid in straight lines except when otherwise specifically approved drawings or directed by the WWU inspector. When deviation from a straight line is permitted, the deflection of each joint shall not exceed the manufacturers recommended maximum for the type of joint and the size of the pipe to be installed. Pipe shall be laid with at least three (3) feet of cover over the pipe to the proposed finished grade or to the future grade when such is lower. Along extensions of roads, which are unimproved, the pipe shall be laid with at least four (4) feet of cover over the top of the pipe to the existing grade. The depth of the pipe may be increased locally to pass obstructions. Grade changes shall be accomplished by fittings and / or dividing the necessary deflection among several joints as approved by the inspector.
Special care shall be exercised to remove all dirt, stone and other materials from each pipe as it is laid, and to prevent such materials from entering each length of pipe. The contractor shall see that the entire line is maintained absolutely clean on the inside line and that all valves and hydrants are clean and in good working order when installed. Open ends shall be adequately protected at all times and shall be securely sealed with approved plugs whenever work is stopped for any reason whatsoever. Unsanitary practices will not be permitted. After removing the plug, the interior of the pipe shall be inspected and cleaned before resuming pipe-laying operations.
Before laying each length of pipe, the contractor shall carefully examine it for breaks, cracks, or other defects and shall discard any section, which appear in any way to be defective. All pipe and fittings shall be handled and installed with care to avoid damage. Ringing of the cast iron with a small hammer is recommended to detect cracks in the pipe that may not be readily visible to the naked eye.
Each section of pipe shall be solidly bedded in the trench bottom and shall be supported for its full length.
Before making a connection, the ends of the pipe and all joint members shall be thoroughly cleaned. All mating shall be done in strict accordance with the manufacturer's recommendations and the requirements of the WWU inspector.
The contractor shall perform all necessary pipe cutting and locate valves, fittings, and fire hydrants in the exact positions indicated on approved drawings. He shall provide and use cutting tools of an approved type and in good order, so as to ensure clean, square cuts to exact measurements. All fittings and valves shall be accurately set true and to square with the pipelines. Valve stems shall be accurately plumb. Fittings and valves shall be supported by approved blocking so as to ensure their remaining accurately in position during jointing and in such a manner that their weight will not place undue strain on connecting pipe or joints. Valve boxes shall be set plumb, accurately centered with respect to the valve stem, well supported by solidly tamped earth and with their tops flush with the finished grade of the roadway or surface of the ground where set.
Thrust blocks shall be installed or lines rodded at all bends greater than ten(10)degrees and at all tees, plugs, valves, blow-offs, reducers, and fire hydrants. This is to prevent movement of the lines or appurtenances under pressure. The contractor shall use rods instead of thrust blocks or reverse when directed by the WWU inspector. The use of “MegaLugs”- mechanical joint restraints for Ductile Iron Pipe are permitted with approval of the WWU inspector.
THE FOLLOWING IS A LIST OF REQUIREMENTS GOVERNING THE CONSTRUCTION OF THRUST BLOCKS:
1. All thrust blocks shall be constructed of poured concrete with minimum twenty-eight (28) day compression strength of 3500 PSI. Dry laid concrete block or any other type of construction is not acceptable for thrust block unless prior approval has been obtained in writing from the WWU.
2. The bearing area of the thrust blocks shall be poured against undisturbed soil and the bearing area shall be sufficient to prevent any movement when lines are tested and again when they are put into operation. Always use 100 PSIG as the internal line pressure.