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3 k , I There is one basic difference Rust Strength between Owens-Corning Steel tank rust can occur internally Properly installed, Fiberglas tanks as well as externally. Attempts to pro- are strong enough to withstand con Fiberglas F underground tect the outside of steel tanks will do stant traffic from the heaviest over- petroleum storage tanks and nothing to prevent internal rust. Fac- the-road vehicle(H 20 axle tors which can contribute to internal loads-32,000 lbs/axle). tanks made from steel, rust include: water condensation Fiberglas tanks can't rust. and sludge containing water and Fiberglas underground tanks were bacteria. Internal rust which con designed to meet specific perfor } Steel Tank Corrosion tributes to many unprotected steel mance criteria in dry or wet holes Steel underground storage tanks tank leaks is eliminated with when properly installed with specified can corrode.There are two sources Fiberglas underground tanks. backfill. An empty Fiberglas tank of corrosion of steel tanks: galvanic installed in a simulated wet hole action and stray electrical currents. condition(seven feet of water over � the tank top)will maintain a 2:1 safety Galvanic action is a natural action _ factor against external hydrostatic between steel and the soil. The action4t, pressure. _ produces current much like a dry cell battery. Corrosion occurs as the cur . National Availability rent leaves the tank surface. Corro- Manufacturing plants located in sion may be more pronounced " Mount Union, PA,Valparaiso, IN, where steel tank surface conditions Conroe,TX, Bakersfield, CA,and vary from one area of the tank to Auburndale, FL, assure rapid another. Non-homogeneous backfill delivery of Fiberglas tanks to any material may also aggravate the ` t part of the United States. problem. Factors which affect galvanic corrosion include: soil ;� resistivity, soil H, and backfill com Trained Independent a Y p Installation Contractors position. Backfill which is con Owens Owens-Corning has trained hun taminated with cinders, de-icing In over 20 years and over 100,000 g salts,fertilizer or runoff from septic tank installations there has never dreds of contractors nationwide in tanks will contribute to corrosion. been a leak caused by internal or the proper installation techniques 'j Galvanic action corrosion of a new external corrosion in a Fiberglas for Fiberglas tanks. steel tank can be accelerated when petroleum storage tank. That's the tank is connected to old steel proof, not promise. Owens-Corning Fiberglas Tanks tanks. petroleum storage tanks carry a Intended Use 30 year limited warranty against Owens-Corning Fiberglas petroleum These conditions may vary within a internal and external corrosion as storage tanks are designed for the single installation.When testing soil well as structural failure. storage of gasoline, gasohol(10% resistivity, several tests must be ethanol and 90010 gasoline mixture), made at different points to make the 9.501b Oxinol-50*(4.75010 methanol resistivity results more reliable. Owens-Corning Fiberglas tanks are and 4.7501b GTBA)and 90.501b gaso- listed and labeled b ;. Y UL(Under- line mixture,jet fuel, kerosene, diesel Stray electrical currents may occur writers Laboratories)and/or Factory fuel orpotable wa ter a t ambien t through grounding of various direct Mutual. Our manufacturing plants underground temperatures. Fuel oil current electrical equipment.Typical are inspected by these testing may be stored at temperatures not to ' sources are direct current rapid tran- agencies as part of their follow-up exceed 150°F. sit systems, cathodic protection of service. adjacent structures and even electric The storage of other materials may welding.The current may discharge Maintenance Costs affect the life of the tank. Before stor- from underground steel tanks,taking Because Fiberglas tanks are not ing materials other than those listed metal from the tank, resulting in cor- susceptible to rust,the repair or relin above contact the Quality Assurance rosion. Even cathodically protected ing of the tank due to rust will never Manager, Undergound Tanks, steel tanks may not prevent stray be required. No electronic monitor- Owens-Corning Fiberglas Corp., current corrosion. ing or anode replacement is needed. Toledo, Ohio. Reg.T M.ARCO Chemical Co