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� • i 1 ' METHODS All operations were conducted with Pelagos Corporation's AELL/1000 ' portable testing unit and sensors. Both were designed and developed specifically for leak detection by Pelagos' engineers. ' SOUTHERN PACIFIC PIPE LINES, INC. ' Three eight—inch pipelines adjacent to Southern Pacific's Stockton Terminal . Facility were tested utilizing current acoustic -emissions ' technology. The three pipelines were identified by Southern Pacific personnel as "diesel", "main" and "Shell/Mobil" lines. Approximatley a 500-foot segment of each of the three pipelines was tested along Navy Drive frontage to Time Oil Company and Tesoro Refinery porporties. Access to the pipes at approximatley 100 foot intervals was provided by trenching with backhoe equipment. Once the lines were exposed, small three inch patches were cleaned to bare metal for AE sensor attachment. At each of these ' points along the pipelines an AE sensor was coupled magnetically to the pipe. The acoustic levels of sixteen discrete frequencies were then ' monitored while the lines were under static pressure. Line pressure during testing was held at 90 psi on the "Shell/Mobil" line , 120 psi on the "diesel" line and 376 psi on the "main" line. TESORO REFINING, MARKETING AND SUPPLY COMPANY ' Three six-inch pipelines identified by Tesoro Refining personnel as their "no lead", "premium" and "regular" rack lines were monitored during a ' hydrostatic testing. The "no lead" and "regular" lines were monitored at a point nearest their subterrainian excursion to Tesoro Refinings' loading ' racks. The "premium" line was monitored at a point approximatley 60 feet from its underground excursion to the loading rack. The lines were under 50 psi static pressure during monitoring. The three lines were monitored by attaching an AE sensor to a clean section of pipe and observing the acoustic levels at sixteen switch selected frequencies.