Agenda Packets - 1985/04/22 - Laserfiche WebLink

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DISCUSSION OF CORROSION AREAS FOR UNDERGROUND TANKS Information based on 40 years of study by the National Bureau of Standards, and a INN nationwide survey of oil companies, utilities, pipe line companies, natural gas transmission and distribution systems, and communications companies is reflected In this corrosion map. The survey was made by the Hlnchman Co., Corrosion Engineers, Detroit, Michigan. In most of the black areas the average life of unprotected steel tanks Is less than 10 years. In the gray • less than 20 years. The seriousness of the corrosion problem is Indicated by the fact that TO pot. of those participating In the recent nationwide survey, Install corrosion protection materials on all new underground metallic structures. To further assist you In determining where potential corrosion problems may be found we are listing some of the causative and contributing factors. CORROSION FACTORS External Soil Resitivlty Landfill • Organic Material Water Table Stray Currents Soil pH Bacteria De4cInizers Salta Septic Cindery Cinders SulphureFrom Mining Areas Underground corrosion Is the result of many variables and therefore hard to predict. Testing for soil resistivity Is one measure of soil corroslvlty but, Is not the only factor to be considered In evaluating the corrosivity of an environment. Soil$ with resistivity above 10,000 ohm centimeters may be corrosive because of other environmental factors such as acidity, stray currents, newly Installed septic tanks, etc. You may be able to add to the areas of high corrosion from your own experience, your own records of underground tank replacements or Information from pipe line companies, utilities or other firms who bury metallic sturctures In your area. Special attention should be given to metropolitan areas due to the many landfill building sites. Turnpike sites with septic tanks are also potential . corrosion areas. Common sense is an Important as testing In determining locations where corrosion could be a serious problem. Armor Shield resins will not rust or corrode when exposed to moisture and chemicals found In the soil. Lengthy experience of Reinforced Plastics In much more highly corrosive environments such as boats, salt water pipe lines, automobile bodies, assure long life expectancy. Internal Armor Shield tanks are maintenance free -an Investment not a Ilabllilya permanent cure to wnrar Additives,.,,rrnarnnoroblems:not atemporaryremedy. CALL(YOURTOTALAUTHORIZED SUPPLIERrn�. FOR MATERIAL, EQUIPMENT, APPLICATION •