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1 <br /> Alternative Monitoring Systems: A Performance Comparison <br /> Containment Liquid Vacuum <br /> Solutions Sensors In Or Air Gasoline <br /> Hydrostatic Dry Annular Pressure Vapor <br /> Tank Monitor Space Monitors Sensors <br /> Leak Detection Performance <br /> Meets EPA criteria as a precision tank test Yes No No No <br /> Monitors inner wall totally Yes Nol'li'I Large Leaks Yes <br /> Only") <br /> Monitors outer wall totally Yes No(')(')(s) Large Leaks Nor10)(7) <br /> Only(a)(3) <br /> Prevents product from escaping into the Yes NoM Nol'i Nor') <br /> annular space with an inner wall leak <br /> Proven In Use <br /> Leak detection performance independently Yes Unknown Unknown Unknown <br /> tested and statistically validated <br /> � m <br /> Optional electronic equipment tested and Yes Unknown Unknown Unknown <br /> N labeled by Underwriters Laboratories <br /> Long-term proven performance of Yes Unknown Unknown Unknown <br /> 3 = tank monitor <br /> dm <br /> Z 3 <br /> _Design Awards <br /> Winner of National Safety Council Yes No No No <br /> Award for achievements in product safety <br /> Footnotes: <br /> (1) Only monitors the portion of the inner wall which is in contact with liquid product. <br /> (2) Only monitors the portion of the outer wall which is submerged in groundwater. <br /> (3) With an inner wall leak,product can leak to the outer wall.Then,if the outer tank has an unknown leak,product will spill. <br /> (4) The vacuum or pressure pump can mask small leaks in the inner and/or outer tank wall. This pump is normally required to <br /> compensate for pressure and vacuum losses caused by line losses or changes in product temperatures. <br /> (5) Does not monitor any portion of the outer wall. <br /> (6) If the outer wall has a larger leak than the inner wall,product may spill without accumulating in the annular space. <br /> (7) If the annular space is contaminated with product,residual fumes are difficult to remove. <br /> Electronics <br /> Containment Solutions' monitoring and inventory control components can be configured to satisfy a wide <br /> range of customer requirements. <br /> Optional Containment Solutions' components—control and switch panels, sensors, probes and gauges—are <br /> available for all double-wall, single-wall, compartment and oil/water separator tanks as well as for single or <br /> multiple tank installations. <br /> 12 <br /> r <br />