Specifications - City of Montpelier, Vermont

Title:Montpelier District Heating02665 – Water SystemsCity of Montpelier, VTIssue Date:September 28, 2012Page #:6 of 73.6 TESTINGA. The Contractor shall furnish all necessary equipment and labor for carrying out a pressure testand leakage test on the pipeline in accordance with AWWA C600 Specifications. Thecontractor shall notify the Engineer at least 72 hours in advance of the testing to coordinatethe required Engineer’s observation of the test.B. The pipe shall be subjected to a hydrostatic pressure of 50% greater than normal operatingpressure of 225psi, whichever is greater, and this pressure maintained for at least 2 hours.The following restrictions apply:1. Not to be less than 1.25 times the working pressure at the highest point along the testsection.2. Not to exceed pipe or thrust restraint design pressures.3. Be of at least 2hour duration.4. Not vary by more than 5 psi.5. Not to exceed twice the rated pressure of the valves when the pressure boundary of thetest section includes closed gate valves.C. Leakage Test: A leakage test shall be conducted concurrently with the pressure test. No pipeinstallation will be accepted if the leakage is greater than that determined by the formula:L = S*D*(SQRT(P)) / 133200In which L is allowable leakage, in gallons per hour; S is the length of pipe tested, in feet; Dis the nominal diameter of the pipe, in inches; SQRT is the square root, and P is the averagetest pressure during the leakage test, in pounds per square inch gauge.D. The Contractor shall, at his own expense, make any taps and furnish all necessary caps, plugs,etc., as required in conjunction with testing a portion of the main between gate valves. Healso shall furnish a test pump, gauges, and any other equipment required in conjunction withcarrying on hydrostatic tests. He shall, at all times, protect the new water mains and theexisting water mains against the entrance of polluting material.3.7 CHLORINATIONA. Before being placed in service, all new water pipelines shall be flushed and disinfected inaccordance with AWWA C65186 “Disinfecting Water Mains”. The procedure shall bediscussed with the Engineer before the work and shall be approved.B. The location of the chlorination and sampling points will be determined by the Engineer inthe field. Taps for chlorination and sampling shall be uncovered and backfilled by theContractor as required. All taps for testing or chlorination shall be shut off at the corporationstop and the copper disconnected and removed following successful test results.WATER SYSTEMS 02665 6