2003-106 - Laserfiche WebLink

Home Browse Search

2.2 . 8 . Polyethylene (PE) Pressure Pipe Testing All PE brine mains shall be field tested. Supply all labor, equipment, material, gages, pumps, meters and incidentals required for testing. Pressure test each water main upon completion of the pipe laying and backfilling operations, including placement of any required temporary roadway surfacing. All brine mains shall be tested at 150 percent of the operating design pressure of the pipe unless otherwise approved by the Engineer. The operating design pressure of the pipe is 100 psi . The test pressure shall be measured at the highest point along the test section by a recording type pressure gage and a copy of the readout shall be submitted to the Engineer upon completion of the test. All testing shall be conducted in the presence of the Engineer or his/her designated representative. Testing shall be conducted after backfilling has been completed and before placement of permanent surface. Testing procedure shall be as follows . 1 . Fill line slowly with water. Maintain flow velocity less than two feet per second. 2 . Expel air completely from the line during filling and again before applying test pressure. Air shall be expelled by means of taps at points of highest elevation. 3 . Apply initial test pressure and allow to stand without makeup pressure for two to three hours, to allow for diametric expansion or pipe stretching to stabilize. 4 . After this equilibrium period, apply the specified test pressure and turn the pump off. The final test pressure shall be held for one to three hours. 5 . Upon completion of the test, the pressure shall be bled off from a location other than the point where the pressure is monitored. The pressure drop shall be witnessed by the resident project representative at the point where the pressure is being monitored and shall show on the recorded pressure read-out submitted to the Engineer. Allowable amount of makeup water for expansion during the pressure test shall conform to Chart 6, Allowance for Expansion Under Test Pressure, Technical Report TR 31 /9-79, published by the Plastic Pipe Institute (PPI). If there are no visual leaks or significant pressure drops during the final test period, the installed pipe passes the test. If any test of pipe laid disclosed leakage significant pressure drop greater than the allowed, the 1 Contractor shall, at his/her own expense, locate and repair the cause of leakage and retest the line. The amount of leakage which will be permitted shall be in accordance with AWWA C600 Standards. All visible leaks are to be repaired regardless of the amount of leakage. 28