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City of Elk River Design Standards <br />to detect plug leakage. If plugs are found to leak, air shall be bled off, the plugs shall be <br />retightened, and the air shall be reintroduced into the line. <br />The formula below calculates the specified minimum time required for a 1.00 psig pressure <br />drop from a starting pressure of 3.5 psig to a final pressure of 2.5 psig using a leakage rate of <br />0.0015 cubic feet/minute/square foot of internal surface. <br />Calculate all test times by the following formula: <br />T= 0.085 DK/Q <br />where: <br />T = shortest time allowed for the air pressure to drop 1.0 psig, sec. <br />K = 0.000419 DL but not less than 1.0, <br />Q = leak rate = 0.0015 CFM/SF, <br />D = measured average inside diameter of sewer pipe, in., and <br />L = length of test section, ft. <br />2. Mandrel Deflection Test <br />Deflection tests shall be performed on all plastic gravity sewer pipes. The test shall be <br />conducted after the sewer trench has been backfilled to the desired finished grade and has <br />been in place for thirty (30) days. <br />The deflection test shall be performed by pulling a rigid ball or nine -point mandrel (MnDOT <br />Technical Memorandum 98-24-B-01 or latest revision) through the pipe without the aid of <br />mechanical pulling devices. The ball or mandrel shall have a minimum diameter equal to ninety <br />five percent (95%) of the actual inside diameter of the pipe. The maximum allowable deflection <br />shall not exceed five percent (5%) of the pipe's internal diameter. The line will be considered <br />acceptable if the mandrel can progress through the line without binding. The time of the test, <br />method of testing, and the equipment to be used for the test shall be subject to the approval of <br />the Engineer. <br />All testing shall be performed by the Contractor at his expense without any direct compensation <br />being made therefore, and he shall furnish all necessary equipment and materials required. <br />3. Televising <br />Sewer line televising is required, at the cost of the Contractor, for all newly constructed lines. <br />The full video reports shall be submitted to the city via USB flash drive. <br />END OF SECTION 4000 <br />© City of Elk River, Minnesota — All rights reserved 22 <br />