2008-276 C - Laserfiche WebLink

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1 . The test pressure for the raw water piping, pretreatment, permeate, concentrate, finish water wastewater piping, and tank piping shall be 1 - 1I2 times the indicated working pressure 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 onsite distribution system shall be used. Pressure shall not vary more than one ( 1 ) psi for low pressure piping (less than 20 psi ), or five (5 ) psi for other piping during the test periods or as approved by the Engineer . Additionally, allowable leakage shall be computed on the basis of AWWA C -600 , C- 605 where practical . 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 . Should, in the judgement of the Engineer, 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 plant piping within the preceding requirements. 3 .03 DISINFECTION — PIPING, PUMPS A. The Contractor shall famish and install suitable temporary connections to the piping, all necessary pressure pumps, hose, pipe connections, meters, gauges and other similar equipment, and all labor required, all without additional compensation for the disinfection of all required piping systems. Disinfection shall be conducted on the following systems: j1 . High service pumps, including suction and discharge piping. B . Conform to AWWA Standards and as modified herein . I C, Maintain disinfectant for a minimum of 8 hours in such a manner that the entire system will be filled with water containing a minimum chlorine concentration of 50 ppm at any point. I , D . After the disinfecting agents have been permitted to remain for the specified contact periods, the water lines, and valves shall be thoroughly flushed with water until the residual chlorine tests are less than 2 PPM in each instance. The determination of the amount of residual l chlorine in the system shall be made at such points and in accord with standard tests by means of a standard orthotolodine test set. LE. Replace permanent system devices removed for disinfection. 1 F. RO pressure vessels and process piping shall be swabbed with sodium bisulfatet disinfectant prior to loading membranes and flushed accordingly to waste. Piping systems shall be thoroughly flushed from the system to prevent damage to the membrane system. l3.04 CHEMICAL LINES — TESTING AND FLUSHING ' 044572017 02670-3