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Ameron Dualoy° Pipe Monitoring System Several types of tests were conducted to demonstrate the performance of the Dualoy°system. These include: • Effects of pressure in the primary pipe on the brine level • Effects of temperature on the brine level • Effects of trapped vapor in the interstitial space • Effects of a catastrophic failure of the primary pipe • Flow through the interstice • Time to alarm • Sensor alarm set points These procedures are summarized briefly below. Effects of pressure in the primary pipe on the brine level This test involved raising the pressure in the primary pipe from zero psig to 100 psig. The brine level in the reservoir was monitored at regular intervals during this time. Effects of temperature on the brine level This test involved circulating hot or cold water at a constant temperature through the primary pipe. The temperature of the interstice was measured by placing a thermocouple between the bubble pack insulation and the outer pipe. The brine level in the reservoir was measured periodically during the circulation until a constant interstitial temperature and brine level were attained. The temperature of the circulated fluid ranged from approximately 32 deg F (using ice for cooling) to over100 deg F, a temperature range of approximately 68 deg F. Effects of trapped vapor in the interstitial space Two types of tests were conducted with trapped air. In the first case, the interstice was filled by gravity feed. If either gravity feed or a pump are used to fill the interstice without first evacuating the interstice it is anticipated that a small volume of air typical for the number of fittings in the line may be trapped in the clamshells of the pipe system. These were somewhat exploratory tests and were not conducted as rigorously as subsequent tests. Only the temperature of the water circulated through the line was monitored rather than the actual interstitial temperature as was monitored on the later tests. The data is still useful for comparison with other data collected during this evaluation. The second set of tests was conducted by first evacuating the interstice followed by filling the interstice using the vacuum. A 300 ml volume of air was then introduced into the interstice at the Schrader valve located furthest from the reservoir. The same testing that was conducted for the system without vapor was repeated with the trapped air. The results are informative in that the magnitude of the trapped air can then be assessed for gravity filling vs. evacuation. While testing with a known amount of trapped air is indicative of the effect of a specific volume of air, it is difficult to extrapolate the information to longer lines. The test line consisted of five connectors, which is more than would normally be present in a Page 5 of 12