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Ameron Dualoy° Pipe Monitoring System 3.0 DESCRIPTION OF EVALUATION PROCEDURES The test procedures used for this evaluation are briefly described in this section. These procedures are described more fully in an evaluation protocol developed by Ken Wilcox Associates, Inc. (KWA) entitled "Test Procedure for the Evaluation of Liquid Filled Double Wall Pipe for Leak Detection Purposes", February 7, 2003. Test Apparatus The test apparatus used for the evaluation is shown in Figures 2 and 3. A twenty-one ft length of doubly contained pipe was assembled in the KWA laboratory. Reservoir 1 Connector to dispenser (and outlet for circulation) Schrader valves 45 deg connector End cap T Connector 90 deg elbow Straight connector Inlet for circulation Figure 2. Schematic of Pipeline Assembly used in Evaluation (Top View) Several clamshell connectors were included to provide for the type of installation typically found at a station. The pipeline was encased in aluminized bubble pack to minimize the influence from ambient temperature changes that might have occurred during the testing. The primary pipe has an inside diameter of 2.22 inches ID. The reservoir inside diameter was 3.32 inches ID with a depth of approximately 15 inches. The interstitial space is approximately 0.055 inches thick and contains graded sand. The presence of the sand reduces the capacity of the brine in the interstice to one gallon per 75 ft of two-inch pipeline, not including the clamshell connectors used in the construction of the line. The interstice must be filled from the low point in the pipeline to minimize trapped air. For this testing, two methods of filling with brine were used. In one, a vacuum pump was used to evacuate the air from the interstice prior to filling. This practice will minimize the amount of trapped air in the various fittings of the pipeline assembly. In the other, brine was poured in from the low point and allowed to fill the system from Page 3 of 12