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C� <br /> POLYPROCESSING <br /> Providing Solutions Through Innovation <br /> Polyethylene Tank Life Expectancy <br /> For 35 years, Poly Processing Company has been Helping Our Customers . . . <br /> Solve Problems associated with storing hazardous chemicals, Managing Risk with the <br /> Environment and Employee Safety and Growing Their Profits with Increased Tank Longevity <br /> and Operating Efficiencies. We have specialized in providing hazardous chemical storage <br /> solutions to the industrial, water and waste water markets. While we manufacture both linear <br /> and crosslink polyethylene storage tanks; in hazardous chemical environments, crosslink <br /> polyethylene is the material of choice. Our customers report crosslink polyethylene tanks <br /> providing service for 10+ years with 15 to 20 years of tank service being common. However; <br /> there are many factors and variables that have an effect on the useful life of any tank including <br /> polyethylene. <br /> Chemical, Concentration and Temperature: The chemical, concentration and operating <br /> temperature are all factors influencing the life expectancy of a polyethylene tank. For example, <br /> high concentrations of Sulfuric Acid are stress cracking agents and are more aggressive <br /> oxidizers than less concentrated chemicals such as 25% Caustic Soda. For this reason, Poly <br /> Processing offers our customers the OR-1000Tm Anti-Oxidant Systems. Another example: 12% <br /> Sodium Hypochlorite will degrade from UV exposure and elevated temperatures. As it <br /> degrades, sediment builds in the bottom of the tank leading to a shorter tank life. To eliminate <br /> this sludge buildup, Poly Processing Company offers our customers the IMFO® (Integrally <br /> Molded Flanged Outlet). The IMFO® design promotes continuous "system" flushing increasing <br /> tank life and operating efficiencies. Poly Processing Company chemical storage tanks are <br /> constructed from premium materials and designed specifically for the chemical, concentration <br /> and temperature requirements. <br /> Installation and Piping: The single biggest reason for tank life reduction is improper tank <br /> installation and "hard" piping. Polyethylene's broad spectrum of chemical resistance vs. other <br /> materials of construction is based on its ability to expand and contract. Flexible connections <br /> compensate for tank expansion and contraction promoting a longer useful life. It is important to <br /> follow Poly Processing Company's Installation Manual Instructions during the installation <br /> process. <br /> Ventincr Often overlooked, venting is a very important step that promotes tank longevity. <br /> Polyethylene tanks are rated at atmospheric pressure/vacuum. Adequate vent size is always <br /> based on flow and delivery rates so it is important to gather the following information to <br /> adequately determine the proper venting requirements: <br /> 1) Is the tank to be filled pneumatically? <br /> 2) Is the tank to be vented to atmosphere? <br /> 3) Does the length of the vent exceed 3 feet (piped to a central vent system) <br /> 4) Is a fume scrubbing system to be used? <br /> 5) Are vent screens to be used (restricts flow)? <br /> 6) Does the tank manufacturer offer a method of"emergency venting" to prevent over- <br /> pressurization? <br /> Other Items Effecting Tank Longevity: <br /> 1) Continuous cycling (fill /discharge) <br /> 2) Excessive agitation <br /> 3) Mobile applications <br /> For further information about your specific needs or applications, please contact Poly <br /> Processing Company at 1-866-590-6845 or visit our website at www.i)olyi)rocessing.com. <br />