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Supplemental Information on Inspecting Poly Tanks <br /> Integrity Testing <br /> BLACK MARKER TEST—USE TO INSPECT A SPECIFICAREA <br /> Choose an area where cracking is likely to occur(e.g. a stress point) <br /> Use a black,water-soluble marker to fill in a small area (e.g. 3"x3"square). <br /> Before the marker dries, quickly rub off the excess ink with a cloth. <br /> Stress cracks will remain black when the excess ink has been removed. <br /> LIGHT TEST—USE TO INSPECT THE ENTIRE TANK(LESS EFFECTIVE WITH A LARGE TANK) <br /> Remove product before beginning process.. <br /> Lower a bright light into the tank or shine a bright light through the tank wall. <br /> Confined space assessments are required before entering a poly tank. <br /> Closely inspect stress points for fine webs or lines. <br /> BAT TEST—USE TO VERIFY DAMAGE TO AREAS IDENTIFIED BY OTHER TESTS <br /> Remove product before beginning process. <br /> Strike the area where stress cracks are observed with a baseball bat(or similar tool). <br /> Strike the sides of the tank and areas that receive the most sunlight <br /> The tank should flex and rebound under pressure. <br /> Recheck the area(s)for crack and crazing <br /> s <br /> w <br /> Bat test Failed bat test Failed bat test <br /> Suitability for Service <br /> Tanks with moderate damage should be replaced as soon as practical. Tanks with significant damage should <br /> be taken out of service immediately. <br /> Minor Damage Moderate Damage Significant Damage <br /> x Repairable puncture x Thin, fine stress cracks x Thick, wide, or deep stress cracks <br /> x Scratches x Deep crack x Deep crack <br /> x Discoloration due to sun <2" long at a stress point o >2"long at a stress point <br /> o <4" long at a non-stress point o >4" long at a non-stress point <br /> Limited brittleness C Through the tank wall <br /> x Intense swelling or <br /> x Widespread brittleness <br />