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ContainmeA By Design DENIED The O/C Tanks Double -Wall Tank: Engineered for Maximum Safety Fiberglas® tanks have a reputation for safe containment. They have been proven in over 150,000 installations over the past 20 years. Some now specifying underground storage systems with second- ary containment for maximum protection of their natural under- ground water supplies against petroleum contamination. After extensive development and testing, O/C Tanks has engineered an integrated double-wall tank with a "built- in" continuous leak monitoring system for assurance of safe petroleum containment. Award for Achievement in Product Safety Our double-wall tank design and monitoring system is so unique, it earned the National Safety Council Annual Award for Achievement in Product Safety in 1985. High Strength Construction 1701"FlbMilas double-wall tank is not just another tank within a tank. Special high strength Fiberglas ribs bond the inner and outer tank walls together to form a unique structural system. 360 -Degree Secondary Containment Although some tank manufac- turers cut corners and exclude secondary containment around the top of the tank, all Fiberglas double-wall tanks provide full 3600 secondary containment of the primary tank. "Partial" double-wall tanks are more susceptible to leaks compared to tanks which offer complete secondary containment. The American Petroleum Institute (API), in a 1981 study of leaking tanks, confirmedthat 7% of tank leaks occur in the upper quad- rant of an underground tank. Rustproof—Inside and Out And of course, Fiberglas tanks are rustproof, inside and out, on all four surfaces of the inner and outer tank. Most corrosion protected steel double-wall tanks are still vulnerable to rust. Although there is corrosion protection on the tank's exterior surface, few double-wall tanks have internal rust protection on the three bare steel interior sur- faces. A recent survey of 1,900 leaking steel tanks revealed that 29% had perforations due to internal corrosion. Remember, steel can rust. Fiberglas® never will! Continuous Precision Tank Testing All of the Fiberglas tanks in this catalog feature a "built- in" Hydrostatic Tank Monitor. O/C Tanks recommends this monitoring method because of its superior leak detection capability. The Hydrostatic Tank Monitor can also serve the dual pur- pose of a precision tank test. This device has been indepen- dently tested and validated to detect leaks as small as 0.05 gallons per hour; this exceeds the leak detection criteria of 0.1 gallons per hour established by the federal EPA for preci- sion testing equipment. And when it comes to leak detection and precision tank testing, this system is the best because it's continuously monitoring the complete inner and outer tank! Our double-wall tank also has the design flexibility to accom- modate other leak monitoring systems. If another type of tank monitor is specified initially, the Hydrostatic Moni- tor can still be activated at a future date.