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C. Flushing shall continue until a minimum water volume of two times the aggregate <br />pipe volume has passed through the pipe section being cleaned. The aggregate pipe <br />volume shall include all pipe carrying flushing water from the point of introduction <br />to the work to the point(s) of discharge from the run being cleaned. <br />D. For nominal pipe sizes of 6 inches and smaller, the pipe shall be flushed through a <br />discharge extension of at least the full pipe diameter. For nominal pipe sizes greater <br />than 6 inches, a 6 inch diameter discharge extension pipe, connected to the work with <br />reducer(s), may be used in lieu of a full diameter blowoff. <br />E. Flushing water shall be carried beyond the trench and shall be discharged in a manner <br />that will not cause erosion nor structural damage on or off-site, and will not cause <br />contravention of State water quality standards in receiving surface waters. The <br />Contractor shall provide adequate extension pipe, sedimentation basin(s), and/or <br />diffusion devices as necessary to prevent such damage. <br />4. HYDROSTATIC LEAKAGE AND PRESSURE TESTING <br />A. Hydrostatic pressure and leakage tests for ductile iron pipe shall conform with <br />Section 4 of AWWA C-600 Specification with the exception that the Contractor <br />shall furnish all gauges, meters, pressure pumps and other equipment needed to test <br />the line. P.V.C. pipe shall be tested in accordance with the applicable sections of <br />AWWA M23. Upon completion of flushing, the installed pipe system shall be <br />tested for tightness under a continuous hydrostatic gauge pressure of 25 psi and then <br />100 or 150 psi as applicable, ± 5 psi, determined at the lowest point in the system, for <br />a period of 2 hours. The allowable leakage rate shall not exceed that defined in and <br />specified by AWWA C600-82 or AWWA M23. <br />B. If the work is subject to acceptance by a municipal or private utility with its own <br />adopted test requirements more stringent than those stated herein with regard to <br />pressure, duration, and/or allowable leakage rate, such requirements shall supersede <br />these specifications. <br />C. Testing shall be performed separately on each valved -off section of the installed <br />system. Testing shall be against closed in-line valves with each valve in the system <br />subject to the full test pressure differential for full test time at least once during the <br />course of testing. <br />D. Allowable leakage shall be calculated based on the pipe diameter(s) and total laid <br />length of the run being tested, with no additional allowance for fittings, or joints. No <br />visible leakage shall be allowed. <br />If visible leakage is noted during the course of testing, or if allowable leakage is <br />exceeded, such leakage shall be repaired to the satisfaction of the Engineer and the <br />test repeated or extended for an additional period up to the full test time with suitable <br />adjustment for previous make-up water used, at the Engineer's discretion. <br />02535 = 2 <br />02535 - Testing Force Mains <br />