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Rim Seal Chevron uses the best seals to close the gap between the floating roof and the tank shell. These "shoe seals" are made of stainless steel (rather than plastic or carbon steel). The shoe seal is the most durable and maintenance -free seal available. It is important to have a high -reliability seal because it reduces the possibility of fires, emissions, and evaporation losses. Sensors prevent --- overfills by shutting down receipts of product into tank in case of emergency Servo mechanis moves up and d( giving water leve and fuel level • Water draw piped to • processing facility Deep Sump De • The deep sump in the tank bottom collects water. Tanks are checked for water after every product receipt and accumulated • water is then removed. The automatic tank gauging system detects water using an accurate servo system displacer that senses how much water is in the sump. As long as the water is confined to the sump, the amount of exposure of the product to water is relatively small and product integrity is maintained. Note: In some locations, the ladder rungs are omitted to reduce the hazard of unauthorized entry. Overfill Protection System Chevron tanks are equipped with state-of-the-art overfill protection systems. Overfills are damaging to the environment, and they may create a fire. While American Petroleum Institute Standard API 2350 which addresses overfills includes many principles of overfill prevention, Chevron goes much further than API 2350 by applying its principles to all finished fuels and to all types of tank transfers. The Chevron Overfill Standard classifies tanks into 4 basic categories: • Categories 1 and 2 include most of our tank overfill systems and represent conventional overfill systems which may or may not be instrumented. Our standard requires that these systems be upgraded whenever a tank is internally inspected up to a Category 3 or 4 system. • A Category 3 system uses an independent safety shutdown system, which automatically shuts down the incoming product, should the liquid level rise beyond the high-level alarm point, to prevent overfills. • Category 4 systems are all electronic, self checking devices that use non -contact, no moving part devices (except for the Servo which measures water in addition to liquid level) to greatly improve the reliability of the overfill system. Chevron encourages the use of Category 4 systems accomplish the same purpose as Category 3 systems. Today, only Category 3 or 4 systems are acceptable to Chevron. While hardware and technology are important, Chevron additionally recognizes the importance of good procedures, testing and training. All of these are also incorporated into the overfill prevention system standards as well.