2012-227C - Laserfiche WebLink

Home Browse Search

ANSI/AWWA B303 or liquid chlorine ANSI /AWWA B301 . Dry hypochlorite , similar to " HTH " or equal may also be used as the disinfecting agent . PART 3 - EXECUTION 3 . 01 EXAMINATION A. Verify that piping systems have been cleaned , inspected , and tested . B . Coordinate scheduling of flushing , pressure testing , and disinfection activities with tie-ins , certifications , and sequence of construction . 3 . 02 FLUSHING AND PRESSURE TESTING - PIPING A. The Contractor shall furnish and install suitable temporary testing plugs or caps for the water lines , all necessary pressure pumps , hose , pipe connections , meters , gauges and other similar equipment, and all labor required , all without additional compensation for conducting pressure and 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 , 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. 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 . 01025=34 Technical Specifications F:\Public Works\ENGINEERING DIVISION PROJECTS10545-66Th Ave SR60 to 57th St (Arcadis)Vidmim\Bid Documents\Technical