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IV D <br /> DROP TUBE CALCULATIONS for OVERFILL FLAPPER VALVE (20,000 GALLON�40V 3 O 2017 <br /> Top of Riser with Adaptor Removed ENVIRONMENTAL HEALTHDEPARTMENT <br /> Top of Riser <br /> Upper Drop Tube "A" <br /> Tank Riser Pipe <br /> Top of Tank <br /> «B» <br /> +^ 95% of a <br /> Full Tank <br /> (U.S.T) «C» <br /> Lower Drop Tube <br /> 45° <br /> 51/2" <br /> Bottom of Tank <br /> Measurement Value Description <br /> A" (Determined at Tank Installation) Distance from the Top of the Riser to the Inside of the Top of the Tank <br /> B 12-1/2"(PER TANK CHART) 95% Full Tank Level <br /> "C" (Determined at Tank Installation) Distance from the Top of the Riser to the Bottom of Tank <br /> Calculations <br /> 95%TANK CAPACITY=0.95 x 19,951 GAL.= 18,953 GAL. <br /> FLAPPER VALVE HEIGHT ABOVE BOTTOM OF TANK=107 1/8"(PER TANK CHART AT 18,939 GAL.) <br />