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10. Upon completion of a successful test, the ENGINEER and the CONTRACTOR shall certify the test results. 11. Questions pertaining to procedures used during the test shall be answered and decided by the ENGINEER. 12. Leaks or defective pipe disclosed by the hydrostatic test shall be corrected by the CONTRACTOR at his own expense, and the test shall be repeated. E. Allowable Leakage – DIP and PVC Pressure Piping 1. No installation will be accepted by the ENGINEER until the leakage is less than the number of gallons per hour as determined by the formula: Q = (S)(D) (Square Root of P) 133,200 in which Q = allowable leakage in gallons per hour, S = total length of pipe being tested in feet, D = diameter of pipe tested inches, and P = the average test pressure during the leakage test in pounds per square inch. 2. When testing against closed metal-seated valves, an additional leakage per closed valve of 0.0078 gal/hr/in of nominal valve size shall be allowed. F. Allowable Leakage – HDPE Pressure Piping (Monitored Make-Up Water Test) 1. The testing procedure for HDPE pipe consists of initial expansion, and test phase. During the initial expansion phase, the test section is pressurized to the test pressure, and enough make-up water is added each hour for three (3) hours to return to test pressure. 2. The test phase follows immediately, and may be two (2), or three (3) hours. At the end of the test time, the test section is returned to test pressure by adding a measured amount of water. If the amount of make-up water added does not exceed the Table 1 values below, leakage is not indicated. Table 1: Test Phase Make-Up Amount Nominal Pipe Size (in.) Make-Up Water Allowance (U.S. Gallons/100 ft. of Pipe) 2-hour test 3-hour test 1½ 0.10 0.17 2 0.11 0.19 3 0.15 0.25 4 0.25 0.40 6 0.60 0.90 8 1.00 1.50 City of Sunny Isles Beach NE 174th Street Roadway Improvements 15105 - 31 Pipes and Tubes 14-1758 / 09-19-2014