1999-338A - Laserfiche WebLink

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i! period up to the full test time with suitable adjustment for previous make-up water used, at the Engineer's discretion, E. During testing at pressures in excess of 100 psig., all corporation stops not connected to services shall be sealed with appropriate screwed caps or plugs. All service corporation stops shall be left open and the services tested against closed curb stops. F. The pumpinglpressurizing and make-up water measuring equipment shall be provided by the Contractor and approved by the Engineer prior to testing. The pressurizing equipment shall be designed and operated in a manner that will minimize pressure surging and pulsing within the pipe. G. The Contractor shall provide and install a temporary valved tap with a 114" FPT connection to receive the pressure gauge in each pipe run to be tested Upon satisfactory completion of testing, the Contractor shall remove and plug the pipe. H. In preparation for testing, the pipe shall be slowly filled with clean water from an approved source, taking care to purge all air pockets. Water remaining in the pipe system after flushing may be used and supplemented as necessary with prior approval by the Engineer, and clean test water may be reused For sequential testing of pipe segments. I. In conducting the test, water shall be pumped into the full pipe until test pressure is attained, and make-up water shall be added as soon as the pressure drops to 5 psi below test pressure. All matte -up water shall be accurately treasured, and the total test leakage shall be defined as the volume of make-up water added. J. Should the tested section fail to meet these requirements, the Contractor shall, at his own expense, locate and repair the defects and retest the section until it is acceptable. K. Where any section of pipe is provided with concrete thrust blocking, the hydrostatic pressure test shall not be made until at least seven days after the concrete was placed except if high early -strength cement is used, in which case the hydrostatic pressure test shall not be made until at least three days have elapsed. L. Immediately upon completion of a passing pressure test, all valves shall be operated to insure their full opening and closing. DISUgFECTION A. Upon satisfactory completion of pressure and leakage testing, all newly installed pipe, services, and hydrants shall be disinfected by introduction of a concentrated solution of calcium hypochlorite or sodium hypochlorite, along with sufficient potable water to fill the pipe system, until a free residual chlorine concentration of 204 mgll is obtained throughout the system. The Contractor shall provide the water source, chlorine feed system, chlorine test equipment, and bacteriological testing lab, subject to the Engineers approval prior to disinfection. l.. B. The Contractor shall provide and install a minimum 314" threaded tap for chlorine introduction and a stand pipe with 1/2" hose bib sampling tap above grade at the upstream end of the piping section being disinfected, and a 2" valved blow off with a 1/2" hose bib sampling tap at the zu•s l~