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State-of-the-A• Institute recommends sec- • 2. System Testing for Tightness Containment: ondary containment systems Double-wall tanks can be Double-wall Tanks from wherever the underground tested at the jobsite—prior OIC TANKS tanks are located within 300 to and after installation—to feet of underground water prove that both the primary supplies. and secondary containment Background barriers are product tight. It Throughout the 1950's and Increasing Liability is nearly impossible to eco- 1960's many corporations Exposure nomically test the secondary installed steel underground The potential liabilities can barrier for vaulted or lined gasoline and diesel storage be high. One small leak in an systems. tanks for fueling their car and underground fuel storage tank truck fleets. These steel tanks can be enough to cause an 3. Minimizes Leak Detection are now failing in epidemic explosion or pollute the ground- False Alarms proportions. In fact,the Federal water in the community. Many Double-wall tanks provide Environmental Protection corporate Risk Managers are an isolated monitoring space Agency(EPA) estimates that faced with the increased pos- (between the inner and outer more than 100,000 tanks are sibility that they will be unable tank) for each tank. This leaking right now. to obtain tank leak insurance monitoring space cannot be coverage for gradual, as well penetrated by rain water run. The primary cause for leak- as sudden,accidental pollution. off or accidental spills,which ing steel tanks is rust, which Those that do find coverage may cause false alarms in can attack either the external will be forced to comply with vaulted or lined systems. or internal tank surface. The more restrictions and will shortcomings of steel tanks and also pay significant premium To meet the changing needs the resulting environmental increases. of our customers, O/C TANKS problem were first publicly has developed astate-of-the- identified in the early 1960's These increased risks and art double-wall tank system. by the American Petroleum potential liabilities are causing The Fiberglas double-wall tank Institute (API), who requested tank owners, specifying engi- provides four unique features: that Owens-Corning Fiberglas neers and installing contractors develop a rustproof underground to re-evaluate the effective- a. High Strength Rustproof ® storage tank. To meet this ness of their underground Construction ^ market need, Owens-Corning storage systems. b. Full 3600 Secondary developed and pioneered the Containment first Fiberglass tank. The Trend to c. Continuous Leak Monitoring Double-Wall Tanks The early users of single-wall Many large industrial com- d. "Built-in"Precision Test Fiberglas tanks were a handful panies are now specifying Capability of major oil companies who secondary containment for were keenly aware of the steel underground storage applica. The system also includes tank design, engineering and tions. Although some second- optional electronic monitoring maintenance deficiencies.Over ary containment codes also equipment and optional second- the last 25 years, the conven- allow single-wall tanks when ary containment accessories tional Fiberglas tank earned a used inside concrete vaults for piping. reputation for safe, long-term or excavation liner systems, containment. Fiberglas under- liability-conscious tank owners For added liability protection, ground tanks have been proven are usually specifying double- specify the state-of-the-art in in over 175,000 installations. wall tanks for three primary underground containment Approximately 85% of all reasons: systems—specify O/C TANKS underground fuel tanks now Double-Wall Tanks with the being purchased and installed 1. Improved Jobsite Quality Hydrostatic Tank Monitor. by major oil companies are of Control fiberglass construction. Better jobsite quality control National Safety is possible because double- Council Award Changing Environmental wall tanks are manufactured And safety experts have Codes and tested in a controlled acknowledged the advanced Some municipalities, counties environment. Since con- engineering of the O/C TANKS and states are now specifying crete vaults or liner systems double-wall tank with its underground storage systems require field fabrication, job- "built-in" monitoring system with secondary containment site quality is dependent on and continuous precision tank features for maximum pro- weather conditions and field tester. The exceptional perfor- tection of the natural under- labor workmanship. Also, mance of this system earned ground water supplies against liner systems can be punc- the National Safety Council petroleum contamination. tured during installation and Award in 1985. concrete vaults may crack The American Petroleum over time.