Leakage Tests Sample Clauses

Leakage Tests. Following final trench backfilling, leakage tests shall be performed on all installed piping according to the latest editions AWWA Standards. The Director is to be provided a minimum of 48 hours’ notice of a leakage test. The test is to be undertaken under the supervision of the developer’s engineer and may be witnessed by a staff member of the Town. The section to be tested shall be filled with water and all air expelled from the piping for at least 24 hours prior to testing. By pumping water into the test section, the pressure within the piping shall be increased to the pressure rating of the main or at least 1 1/2 times the operating pressure at the point of testing, whichever is greater. This pressure shall be maintained constantly in the pipe within + 35 kPa (5 psi) throughout the duration of the test, by the addition of make-up water. The duration of the test shall be a minimum of 2 hours. Hydrant leads shall be open at the hydrant such that the hydrant is placed under test. The quantity of water pumped into the test section to maintain the specified pressure over the period of the test shall be considered to be the leakage. Water mains will not be accepted until the leakage is less than the maximum allowable leakage determined from the following formula: L = NDP½ where; 262,000 L =the allowable leakage (L/hr) N=the number of joints in the test section D=the nominal diameter of the pipe (mm) P=the average test pressure during the leakage test (kPa) Should any test result be leakage greater than that specified above, the source of the leakage shall be located and the defect repaired or replaced and the section retested until a satisfactory test is obtained. Flushing The pipe is to be flushed clean of dirt and other foreign materials. Water for flushing will be made available by the Town through an appropriate backflow prevention device.