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Owl %W State -of -Them -Art Containment: Double -Wall Tanks from O/C Tanks The American Petroleum �2. System Testing for Tightness Double-wall tanks can be Institute recommends second- systems wher- tested at the jobsite—prior ary containment ever the underground tanks to and after installation—lo that both the primary are located within 300 feet of supplies. prove and secondary nment tlight underground water barriers are product It is nearly impossible to eco- Increasing Llabillty Background Exposure Throughout the 1950's and The potential liabilities can 1960's many corporationsbe high. One small leak in an installed steel underground underground fuel storage tank gasoline and diesel storage can be enough to cause an tanks for fueling their car and explosion or pollute the ground - truck fleets. These steel tanks water in the community. Many are now failing in epidemic corporate Risk Managers are proportions. In fact, the Federal faced with the increased Environmental Protection possibility that they will be Agency (EPA) estimates that unable to obtain tank leak more than 100,000 tanks are insurance coverage for gradual, leaking right now. as well as sudden, accidental pollution. Those that do find coverage will be forced to comply wish more restrictions and will also pay significant premium increases. The primary cause for leaking steel tanks is rust, which can attack either the external or internal tank surface. The shortcomings of steel tanks and the resulting environmental problem were first publicly identified in the early 1960's by the American Petroleum Institute (API), who requested that Owens-Corning Fiberglas develop a rustproof under- ground storage tank. To meet this market need, Owens- Corning developed and pio- neeredthe first Fiberglas" tank. The early users of single-wall Fiberglas" tanks were a handful of major oil companies who were keenly aware of the steel tank design, engineering and maintenance deficiencies. over the last 20 years, the con- ventional Fiberglas tank earned a reputation for safe, long- term containment. Fiberglas underground tanks have been proven in over Approximately instal - talions. App 850/0 of all underground fuel tanks now being purchased and installed by major oil com- panies are of fiberglass construction. These increased risks and potential liabilities are causing tank owners, specifying engineers and installing con- tractors to re-evaluate the effectiveness of their under- ground storage systems. nomically test the secondary barrier for vaulted or lined systems. 3. Minimizes Leak Detection False Alarms Double-wall tanks provide an isolated monitoring space (between the inner and outer tank) for each tank. This monitoring space cannot be penetrated by rain water run-off or acci- dental spills, which may cause false alarms in vaulted or lined systems. The Trend to Double -Wall Tanks Many large industrial com- panies are now specifying secondary containment fo underground storage applica- tions. Although some second- ary containment codes also allow single-wall tanks when used inside concrete vaults or excavation liner systems, liability -conscious tank owners are usually specifying double- wall tanks for three primary reasons: Changing Environmental Codes Some municipalities, counties and states are now specifying underground storage systems with secondary containment features for maximum protec- tion of their natural under- ground water supplies against petroleum contamination. To meet the changing needs of our customers, O/C Tanks has developed a state-of-the- art double-wall tank system. The Fiberglas double-wall tank provides four unique features: a. High Strength Rustproof Construction b. Full 3600 Secondary Containment C. Continuous Leak Monitoring d. "Built-in" Precision Test Capability 1, Improved Jobsite Quality Control Better jobsite quality control is possible because double- wall tanks are manufactured and tested in a controlled environment. Since con- crete vaults or liner systems require field fabrication, job - site quality is dependent on weather conditions and field labor workmanship. Also, liner systems can be punc- tured during installation and concrete vaults may crack over time. The system also includes optional electronic monitoring equipment and optional secondary containment accessories for piping. For added liability protection, specify the state-of-the-art in underground containment systems—specify OIC Tanks Double -Wall Tanks with the Hydrostatic Tank Monitor. National Safety Council Award And safety experts have acknowledged the advanced engineering of the O/C Tanks double-wall tank with its "built-in" monitoring system and continuous precision tank tester. The exceptional perfor- mance of this system earned the National Safety Council Award in 1985. t 1