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Duration of Pressure Test The duration of 30 minutes. each pressure test shall be at Procedure Each valved section of pipe shall be slowly filled with water and the specified test pressure, measured at the point of lowest elevation, shall be applied by means of a pump connected to the pipe in a satisfactory manner. The pump, pipe connection and all necessary apparatus, gauges and meters shall be furnished by the Contractor. Expelling Air Before Test Before applying the specified test pressure, all air shall be expelled from the pipe. Examination Under Pressure All exposed pipes, fittings and joints will be carefully examined during open trench test. T'here the joints are made with cement and show seepage or slight leakage, only such joints as may be defective shall be cut out and replaced at the Contractor's expense as directed by the Engineer. Any cracked or defective pipes, fittings or valves discovered in consequence of this pressure test shall be removed and replaced by the Contractor at his expense, with sound material furnished by the Owner in the manner provided, and the test shall be repeated until satisfactory to the Engineer. Permissible Leakage Suitable means shall be provided by the Contractor for determining the quantity of -water lost by leakage under, normal operating pressure. No pipe installation will be accepted until or unless this leakage (evaluated on a pressure basis of 150 lbs. per square inch) is less than 75 U. S. Gallons per 24 hours per mile'of pipe per inch nominal diameter for pipe in 16-foot lengths, and correspondingly varied for other lengths of pipe. In calculating leakage the Engineer will make allowance for added joints in the pipe line above those incidental to normal unit lengths,of pipe. Variation from Permissible Leakage Should any test of combined sections of pipe laid disclose leakage per mile of pipe greater than that specified, or if individual sections show leakage greater than the specified limit, the Contractor shall, at his own expense, locate and repair the defective joints until the leakage is within the specified allowance. - 8