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(f) Internal coating must be compatible with product stored. <br /> (4) Electrical Isolation. <br /> (a) Except with impressed current systems, tank to be <br /> electrically insulated from piping by use of special fittings such as nylon <br /> or teflon bushings, bolted flanges with companion nylon flanges, or <br /> equivalent system. <br /> (b) Dielectric material must be able to withstand exposure to <br /> the material to be stored without swelling or degradation. <br /> (5) Tank Joints - Although lap joints are acceptable, double welded <br /> butt joints are recommended as they are less susceptible to corrosion and <br /> stronger than lap joints. <br /> b. Fiberglass Reinforced Plastic (FRP). <br /> (1 ) UL listed and designed in accordance with UL Standard 1316. <br /> (2) Manufacturer's strict handling requirements must be adhered to <br /> when lifting and installing tanks as most of their support strength is <br /> acquired from backfill . <br /> (3) Manufacturer's certification of tank resin compatibility with <br /> product stored. Certain gasoline additives such as methanol are incompatible <br /> with certain resins. Tank manufacturer should be advised of exact chemical <br /> composition of product to be stored and be responsible for selecting proper <br /> ARL tank and providing owner with written assurance of chemical compatibility. <br /> c. Composite - Fiberglass Clad Steel . <br /> (1 ) UL listed (no official standard has been promulgated - presently <br /> reviewed on case-by-case basis). <br /> (2) Internal corrosion protection recommended if not coated <br /> internally. <br /> (3) Electrical isolation from piping system by use of dielectric <br /> bushings or flanges at all piping connections. <br /> (4) Fiberglass coating must be applied under strict quality control, <br /> factory inspected for imperfections and tested electrostatically (spark <br /> testing). <br /> d. Double - Walled <br /> (1 ) Recommended for use on all environmentally critical <br /> installations when used with continuous monitoring system in interstitial <br /> space. <br /> (2) —Most effective monitoring involves applying a vacuum to <br /> interstitial space and checking for vacuum loss. <br /> 2 <br />