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leakage tests and flushing of the piping . Flushing and pressure testing shall be conducted in the following order . B . After all piping lines have been installed and before pressure testing and final connections to existing equipment , each run of pipe shall be thoroughly flushed so as to remove all debris and foreign matter from the piping and equipment . Clean and flush all piping using potable water . Pigging of piping systems shall be incorporated in to this flushing procedure . Non - abrasive pigs shall be employed to clean the DHPE pipes . Sufficient flushing water and pigging shall be introduced into the piping to produce a discharge that is clear with no evidence of silt or foreign matter is visible . Contractor to provide means of discharging and disposing of water at Contractor's expense . C . Pressure testing ductile iron piping systems : 1 . The test pressure for the water piping , irrigation quality water piping , and force main piping systems constructed of ductile iron shall be 150 psi and this pressure shall be maintained for a period of not less than two hours . Tests shall be made between valves and as far as practicable and as approved by the Engineer . Potable water from the distribution system shall be used . Pressure shall not vary more than five (5 ) psi for piping during the test periods or as approved by the Engineer . Allowable leakage shall be computed on the basis of AWWA C - 600 . 2 . All leaks evident at the surface shall be uncovered and repaired regardless of the total leakage as indicated by the test , and all pipes , valves and fittings and other materials found defective under the test shall be removed and replaced at the Contractor' s expense . Tests shall be repeated until leakage has been reduced below the allowable amount . 3 . In the judgment of the Engineer , should it not be practical to follow the foregoing procedures exactly for any reason , modifications in the procedure shall be made as approved by the Engineer . In any event , the Contractor shall be responsible for the ultimate water tightness of the piping within the preceding requirements . D . Pressure Testing HDPE Piping Systems 1 . The test pressure for all piping systems shall be 150 psi and this pressure shall be maintained for a period of two hours . Testing procedure shall be as follows . a . Completely fill pipe with clean water and remove all air from pipe to be tested . b . Allow water in pipe to equalize with surrounding ground/groundwater for 24 hours . c . Bring pipe being tested to test pressure . TECHNICAL PROVISIONS TP -21 FAPublic Works\Capital Projects\Oslo Road Lateral ABID DOCUMENTS\DIVISION 2 - Technical Provisions . doc