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DISCUSSION OF CORROSION AREAS FOR UNDERGROUND TANKS <br />Information based on 40 years of study by the <br />National Bureau of Standards, and a 1968 <br />nationwide survey of oil companies, utilities, <br />pipe line companies, natural gas transmission <br />and distribution systems, and communications <br />companies Is reflected In this corrosion map. <br />The survey was made by the Hinchman Co., <br />Corrosion Engineers, Detroit, Michigan. <br />In most of the black areas the average life of <br />unprotected steel tanks Is less than 10 years. In <br />the gray - less then 20 years. <br />The seriousness of the Corrosion problem Is <br />Indicated by the iect that 70 pct. of those <br />participating In the recent nationwide survey, <br />Install correslon profectlon materials on all now <br />underground metallic structures. <br />To further assist you In determining where <br />potential corrosion problems may be found we <br />are listing some of the causative and <br />contributing factors. <br />CORROSION FACTORS <br />Extemd <br />Sell Resltivlty <br />Landfill - Organic Material <br />Water Table <br />biray Currents <br />Sell pH <br />Bacteria <br />De -Icing Salts <br />Septic Tanks & Fertilizers <br />Cinders <br />Sulphur - From Mining Areas <br />Underground corrosion Is the result of many <br />variables and therefore hard to predict. Testing fgIft <br />soil resistivity Is one measure of soil corrosly ., <br />but, Is not the only factor to be considered In <br />evaluating the .orroslvlty of an environment. Solis <br />with resistivity above 10,000 ohm centimeters may <br />be corrosive because of other environmental <br />factors such as acidity, stray currents, newly <br />Installed septic tanks, etc. <br />You may be able to add to the areas of high <br />corrosion from your own experience, your awn <br />records of underground tank replacements or <br />Information from Flpe line companies, utilities or <br />other firms who bury metallic slurctures In your <br />area. <br />Special attention should be given to metropolitan <br />areas due to the many landfill building sites. <br />Turnpike sites with septic tanks are also potential . <br />corrosion areas. <br />Common sense is an important as testing in <br />determining locations where corrosion could be a <br />serious problem. <br />Armor Shield resins will not rust or corrode when <br />exposed to molslure and chemicals found In the <br />soil. Lengthy exper!ence of Reinforced Plast!cs In <br />much more highly corrosive environments suc <br />as boats, salt water pipe lines, automobile bodle <br />assure long life expectancy. <br />Internet Armor Shield tanks are malnlenance free -an <br />Water Additives Investment not a Ilabilily-a permanent cure to <br />corrosion problems; not a temporary remedy. <br />CALL (513) 281.5100 FOR AUTHORIZED APPLICATOR IN YOUR AREA. <br />YOUR TOTAL SUPPLIER <br />FOR MATERIAL, EQUIPMENT, APPLICATION <br />\�J <br />