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Supplemental Information on Inspecting Poly Tanks <br /> Inspecting Tanks and Plumbing for Wear and Damage <br /> Damage to tanks may be caused by impact, frequent loading or unloading, product movement during <br /> transport, sunlight, or normal aging. Signs of damage may include dents, cuts, punctures, or cracks. A <br /> tank may fail before damage is visible for no apparent reason; inspection and maintenance are important. <br /> The severity of deterioration and damage should be used to determine if tanks are fit for continued use. <br /> Valves, gaskets, or fittings may become misaligned, loose, or deteriorated resulting in seepage, gapping, <br /> or brittleness and should be replaced as needed. Pumps and other equipment should be repaired as <br /> necessary(e.g. if leaking;fouling, corroding, or worn). In general, poly tanks are not repairable. <br /> Damage is frequently observed on stationary tanks at the fittings and near the bottom of the tank. <br /> Examples of Damage <br /> Surfarcr� .,`� <br /> Deep crack at recess point Cut nModerate crazing with crack <br /> �w <br /> s a <br /> Flaking Deep crack at recess point Moderate stress cracks Significant stress cracks <br /> Scratches can usually be felt on the surface of the tank. Cracks appear as very abrupt lines, which may(or <br /> may not)be felt on the surface of the tank. Stress cracks(or crazing)are a serious sign of damage and <br /> frequently occur at stress points. Stress points on stationary tanks include fittings, impact points, near the top, <br /> and the"knuckle" (bottom bend). Stress cracks appear as a network (or spider web)of lines and are often not <br /> visible without close inspection. Conduct one or more of the integrity tests when a tank shows signs of <br /> damage. <br />