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Vaporless Mfg. LD 300013000S <br /> 3.0 Overview of Evaluation Procedures <br /> The Vaporless LD 3000 was installed in the pipline system described above. The STP <br /> delivered the gasoline through the LD 3000 to the pipeline configurations that were used <br /> in this evaluation. The fuel passed through both rigid and flexible segments of the line <br /> simultaneously. The temperature of the product in the pipeline system tank was varied <br /> relative to the surrounding soil temperature to obtain one of the temperature differentials <br /> shown in Table 3. The conditioned product was circulated through the line for one hour. <br /> Leaks were induced as specified in the EPA protocol. The induced leaks were <br /> established during the circulation period either by adjusting the flow of fuel through a <br /> flow meter set to 3.0 gal/h at a pressure of 10 psig or as a non-leak condition. <br /> At the end of the circulation period, a pre-determined piping segment was valved off, <br /> product flow was blocked at the dispenser end of the line, the STP was turned off, the <br /> line pressure was dropped to zero, the STP was turned back on and the zero leak or 3 <br /> gal/hr leak test was conducted automatically by the LD 3000. Testing continued until an <br /> alarm occurred or the LD 3000 indicated a pass condition had occurred. The second <br /> segment, or combined segments, was then valved off and testing repeated. <br /> This evaluation consisted of one 3 gal/hr leak test and one tight test conducted at each <br /> of the temperature differential extremes indicated in Table 2. Thus, a total of 6 tests <br /> were conducted on each of the three pipeline configurations for a total of 18 tests, rather <br /> than the 50 tests prescribed by the EPA protocol. <br /> The test results reported by the Vaporless LD 3000 leak detector were recorded and <br /> compared to the leak conditions that were introduced into the line for the temperature <br /> condition. The results are tabulated in Tables 3-5. <br /> Table 2. Summary of Test Conditions Used in Each Pipeline Evaluation <br /> Range of AT* (°F) Number of Leak Tests Leaks Induced <br /> AT < -25 2 1 tight + 1 @3gal/hr <br /> -5 :5 AT < +5 2 1 tight + 1 @3gal/hr <br /> AT > 25 2 1 tight + 1 @3gal/hr <br /> Total = 6 Tests per Evaluation <br /> * <br /> AT is the difference between the temperature of the product dispensed <br /> through the pipeline for over an hour prior to the conduct of a test and the <br /> average temperature of the backfill and soil surrounding the pipe. <br /> Since the test times were less than 15 minutes, the protocol allows for conducting 3 <br /> tests for each circulation. In this case the test times were less than one minute so that <br /> 3 tests could be conducted on each line for each circulation. The entire process of <br /> conducting the six tests was usually less than 10 minutes. <br /> Page 3 of 8 <br />