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Ameron Dualoy° Pipe Monitoring System Based on these two tests the maximum combined brine level change for a temperature differential of 63 deg F was 0.37 inches or 0.0059 in/deg for the 21 ft test line. The worst-case condition, however, gives a change of 0.0076 in/deg. If the worst- case results are extrapolated to a 300 ft line with a temperature change of 30 deg F, the effect would be around 3.26 inches. The total temperature range of 63 deg F achieved in this evaluation far exceeds the range of temperatures that are expected for a typical service station. If the initial brine level is correctly set and the reservoir size is correctly designed, a level range of 3.26 inches should not be a problem. A high/low sensor spacing of 12 inches would require a level change of±6 inches in order to trigger an alarm. In addition, dual-point sensors can be custom designed to further minimize the probability of false alarm for any site. The manufacturer can design the reservoir to service a site of a defined length. The reservoir would then be suitable for any installation at or below the design length. Temperature Test With Trapped Vapor This testing was conducted with 300 ml of air trapped in the pipeline interstitial space. The same type of testing was conducted with the trapped air as was conducted for the pipeline without trapped air. Two tests were conducted with trapped air. These tests included the following. 1. One 2 hour circulation with cold liquid at constant temperature through the primary pipe; 2. One 2 hour circulation with hot liquid at constant temperature through the primary pipe; The first test involved circulation of cold water at a temperature of 32 Deg F through the primary pipe for 2 hours at a rate of 6 gal/min. The initial interstitial temperature was 70 deg F at the start of the circulation and decreased to 39 deg F. The results show a change in level from 7.94 inches to 7.56 in after 2 hours with a temperature change of 31 deg F. This effect is shown in Figure D-4 in Appendix D. The second temperature test involved circulation of hot liquid through the primary pipe at a constant temperature of 100 deg F for 2 hours with the brine reservoir level again measured at periodic intervals until a steady level was achieved. The interstitial temperature was at 66 deg F at the start of circulation and increased to 97 deg F after circulation. The initial brine reservoir was 7.78 inches at the beginning of the circulation and increased to 8.25 inches at the end of the circulation for a level change of 0.47 inches. The temperature change was 32 deg F. This effect is shown in Figure D-5 in Appendix D. Based on the two trapped air tests, the maximum combined brine level change for a temperature differential of 57 deg F was 0.69 inches or 0.0120 in/deg for the 21 ft test line. The worst-case conditions, however, resulted in a level change of 0.0148 Page 10 of 13