(A) Handling.
(1) Pipe and accessories shall be handled with care to avoid damage. Material shall not be dropped or bumped against pipe or accessories already on the ground or against any other object. Damaged pipe, which cannot be repaired to the town’s satisfaction, shall be replaced at the contractor’s expense.
(2) The interior of all pipe and accessories shall be kept free from dirt and other foreign matter.
(B) Dimensions. The pipe shall be furnished in the longest manufactured lengths unless otherwise shown or specified. Shorter or cut lengths shall be used only when necessary to make closure. Branches, bends, and other specials, where so shown and required, shall be made to standard dimension unless otherwise shown. All pipes shall be straight, true to form, of full diameter throughout, and shall have deep and wide socket joints.
(C) Pipe lying.
(1) Deflection from a straight line or grade, as required by horizontal or vertical requirements or offsets, shall be in accordance with the manufacturer’s specifications.
(2) If the alignment requires deflections in excess of the allowable deflection per joint, special bends or a sufficient number of shorter lengths of pipe shall be furnished to provide angular deflections within the limit set forth.
(3) All pipes shall be laid and maintained to the required lines and grades as indicated on the plans. Fittings shall be installed at the locations shown on the plans.
(4) At times when work is not in progress, open ends of pipe and fittings shall be securely closed so that no trench water, earth, or other substances will enter the pipe fittings.
(5) No pipe shall be laid in water or when the trench or weather conditions are unsuitable for proper installation.
(6) When the proposed elevation of the force main conflicts with the elevation of an existing gravity sewer, water main, gas main, or other structure, the force main shall be depend as directed by the town to avoid said conflict. This shall be done at no additional expense to the town or utility owner.
(7) Pipe shall be laid with bell ends facing in the direction of lying. Pipe ends shall be clear of dirt and debris before the connection is made.
(8) The cutting of pipe for installing valves or fittings shall be done in a neat, workmanlike manner without damage to the pipe or lining. Flame cutting for pipe shall not be allowed.
(D) Thrust restraint.
(1) Trust blocking or restraints shall be provided at all line deflection greater than 22 degrees and as otherwise required to protect the pipe joints from separation.
(2) Trust blocks shall be seized and dimensioned as shown in these standards.
(E) Hydrostatic testing. The testing method described in this division (E) is for water pressure testing. The test, which must be successfully performed on all new force mains, shall be performed in accordance with the following provisions.
(1) Said test shall all force main from point of beginning or the wastewater lift station or to the point of termination. The contractor shall make the arrangements with the town for scheduling the test after the piping has been accepted as being ready for testing. All concrete thrust block shall have been in place for at least ten days prior to the test. The test shall be performed on a day mutually agreed upon and in the presence of the town.
(2) Water for testing must be furnished by the contractor. The contractor shall furnish all necessary equipment, pipings, pumps, fittings, gauges, and operating personnel to properly conduct the test.
(3) The system shall be subjected to a hydrostatic test pressure of 100 psi.
(4) The test procedure shall be as follows.
(a) The system shall be slowly filled with water. Air shall be expelled from the pipe through the air relief valves. If additional air vents are needed to assure that all air is expelled, the contractor shall temporarily install corporation stops at the appropriate points. All air shall be expelled from the force main prior to applying the test pressure.
(b) After the test pressure is applied, a visual inspection of the force main will be made for leaks. All visual leaks shall be stopped by repairing or replacing the damaged or defective pipe, fittings, or valves prior to starting the official pressure test.
(c) After all visible leaks are stopped, the official shall be conducted for a period of at least two hours. During the test, the specified test pressure shall not vary more than five psi.
(d) Pumps shall be equipped with a receiving water receptacle, and the water entering the pipeline to make up leakage shall be carefully measured and recorded. Pumping equipment shall include suitably calibrated pressure gauges. LEAKAGE is defined as a volume of water which must be added to the pipeline to maintain a pressure within five psi to the specified test pressure.
(e) If the amount of makeup water entering the pipeline (during the two-hour test while the pressure is maintained within five psi of the specific test pressure) is less than or equal to the allowable leakage as calculated by the following formula, the pipeline shall be accepted as having passed the leakage test satisfactorily:
L = SD (P)l/2
133,200
Formula from AWWA Standard C600 where:
L = allowable leakage, gallons per hour;
S = length of pipeline tested, feet;
D = nominal diameter of pipe, inches; and
P = average test pressure during test, pounds per square inch gauge.
(f) Appropriate repairs or replacement of defective or damaged materials regardless of the outcome of the test, however, shall stop all visible leaks.
(5) Should the line fail this official test, the pressure shall be maintained while a through search is made of all possible locations of leakage or other cause of pressure drop. When all such conditions are corrected, the pipeline shall be given another official test and this procedure repeated until satisfactory results are obtained.
(6) All leaks developing after the line has been tested and made evident by a showing of water on the ground surface shall be repaired to the satisfaction of the engineer regardless of the results of the official test.
(F) Identification/location tape.
(1) Furnish and install identification/location tape over the centerline of buried force mains.
(2) Identification tape for ductile iron pipe. Identification tape shall be manufactured of invert polyethylene so as to be highly resistant to alkalis, acids, and other destructive agents found in soil, and shall have a minimum thickness of four-mils. Tape minimum shall be three inches and a maximum of six inches and shall have a background color specified below, imprinted with black letters. Imprint shall be as specified below and shall repeat itself a minimum of once every two feet for entire length of tape.
(3) Identification of polyvinyl chloride pipe. Identification tape shall be manufactured of polyethylene with a minimum thickness of four-mils and shall have a one-mil thick metallic foil core. The tape shall be highly resistant to alkalis, acids, and other destructive agents found in soil. Tape width shall be a minimum of three inches and a maximum of six inches and shall have background color specified below, imprinted with black letters. Imprints shall be as specified below and shall repeat itself a minimum of once every two feet for entire length of tape.
(4) Tape background colors and imprints shall be as follows:
(a) Imprint: caution - force main buried below; and
(b) Background color: green.
(5) Identification tape shall be “Terra Tape” as manufactured by Reef Industries, Inc., Houston, TX, or approved equal.
(a) Identification tape shall be installed over all buried force mains in accordance with the manufacturer’s installation instructions and as specified herein.
(b) Identification tape shall be installed two feet below final grade over centerline of pipe.
(c) In all PVC pipe installation, the identification/location tape shall be looped into the manholes for connection to a locating device. The tape shall be one continuous piece from manhole to manhole.
(Ord. passed - -)