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' 2 .2 .4. Brine Main Length of Pipe at Rigid Structures Pipe entering or passing through rigid structures such as concrete vaults shall not have a length extending more than three (Y) feet three (Y) inches beyond either inner or outer face of that structure . Pressure Tests Pressure during test. After the pipe line has been laid, it shall be subjected to a hydrostatic test pressure as specified by the Owner and as related to the normal operating pressure. Unless otherwise specified, the test pressure shall be 50 percent (50%) above the normal working pressure, but not less than 150 psi for the Brine main. When local conditions, in the opinion of the Owner, are such that the trenches must be backfilled immediately after laying the pipe, the pressure tests may be made after backfilling has been completed, but before placement of permanent paving. Duration of Pressure Test rThe duration of each pressure test shall be two (2) hours unless otherwise directed by the Owner. Procedure Each section of pipeline shall be slowly filled with water, and the specified test pressure measured at the point of lowest elevation, shall be applied by means or a pump connected to the ' pipe in a manner satisfactory to the Owner. The pressure test for leakage shall be for a duration of two (2) hours and during the test, the pressure shall not be permitted to fall below 150 psi for Brine main. Water added to the test section of pipe necessary to maintain the specified test pressure shall constitute leakage. The maximum allowable leakage permitted for the Brine main will be determined from the following formula: 133 , loo Where : L = Allowable leakage expressed in gallons/hour N = Length of pipe to be tested in linear feet D = Nominal diameter of Brine main expressed in inches P = Average test pressure during the leakage test expressed in psi The pump, pipe connection and all necessary apparatus, shall be furnished by the Contractor. The Contractor shall furnish all necessary assistance for conducting the tests. All tests will be witnessed by the Owner or his designated inspector. 15