Orange County NC Website
Browse       Search
No connection to existing manholes or sewer lines shall be made until remaining project <br /> construction has been completed and tested. <br /> 17. Testina Sewer Lines and Force Mains. After the sewer lines are completed, but prior to <br /> their acceptance and before any sewage is permitted to enter, the following test shall be made <br /> by the Contractor to determine the watertightness of the lines, including the manholes. The <br /> Engineer will determine whether the test to be made shall be for infiltration or exfiltration. If <br /> ' ground conditions are such that an infiltration test would give no significant results, then an <br /> exfiltration test shall be made in the manner hereinafter described. The sewer line shall be filled <br /> with water to a level equal to the top of the lowest manhole in the section to be tested. At no <br /> ' point in the sewer line shall the head of the pipe reach more than 10 feet of water. The test will <br /> not be deemed conclusive, however, unless the head on the pipe reaches at least 3 feet of <br /> water at the upper end of the section being tested. Tests shall be run on the lines in separate <br /> ' sections so that the head on the pipe is at least 3 feet of water but does not exceed 10 feet. <br /> Under the exfiltration method the line shall be tested for six hours(6)after filling and the leakage <br /> will be carefully measured. Allowable leakage shall be 100 gallons per inch of internal diameter <br /> per mile of pipe per 24 hours. If the leakage exceeds this limit the line shall be drained, <br /> repaired, and retested. The manholes shall be included in the test. <br /> In the event the Engineer elects to test the sewer line by the infiltration method the allowable <br /> infiltration shall be 10 gallons per inch of internal diameter per mile of pipe per 24 hours. If the <br /> infiltration exceeds this limit,the line shall be repaired and retested. <br /> ' Ali sewer lines must pass the test requirements prior to their acceptance by the City. Excessive <br /> leakage or infiltration in any one section shall be corrected even through the total may come <br /> within the allowable limits. <br /> ' Force mains shall be tested in the manner set forth in Section 13 of AWWA Standard C-600, <br /> except the Contractor shall furnish his own gauges and perform the test at no cost to the Owner. <br /> Before final acceptance, the force main shall be filled with water, care being taken to expel all <br /> air. <br /> A pressure test of 150 psi shall be applied to the line at the test pump and shall be maintained <br /> ' at that pressure for a minimum period of two consecutive hours. <br /> All defective material found shall be replaced by the Contractor. All leaking joints shall be made <br /> tight. The pipe installation will not be accepted unless and until leakage, evaluated on the <br /> pressure test of 150 psi for 2 hours, does not exceed 10.0 gallons per day per mile of pipe per <br /> inch of nominal diameter. The contractor has the option of using an air test method in lieu of the <br /> exfiltration method in testing the sewer line. The following requirements apply. <br /> Air Test: <br /> ' Low-Pressure Air Test for Sanitary Sewers: <br /> *Introduction - Numerous laboratory and field air tests have been devised over the years since <br /> the early 1960's. Much of the information contained in these tests was utilized by the American <br /> ' Society for Testing and Materials (ASTM) when preparing ASTM C 828, a low-pressure air test <br /> for sanitary sewers. <br /> ' SANITARY SEWER LINES: DETAILED SPECIFICATIONS FOR INSTALLATION SS-7 <br /> 10/15/09 <br />