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SOV% X <br />N WILLIAMS CONSULTANTS. INC. <br />E-11 <br /> <br />• <br />PROJECT: JOB NO: SHEETS OF_Z <br />I Arequa VLF 1125 <br />FEATURE: BY: DATE: <br />Riser Pipe Design ALD 2/18/08 <br />DETAILS: CHKD BY: DATE: <br />Screen Length DTW 2/20/08 <br />• Criteria: 1) Screen length for riser pipes based on Roscoe-Moss Shutter Screen, Stainless Steel - Standard Flow. <br />• Analysis: <br /> Roscoe Moss Shutter Screen dimensions: <br /> - 24 inch diameter <br /> - 84 slots / foot <br /> - 55 in2 / foot <br /> Flow capacity = 4.8 * (Ap * 12 * Don) <br /> Ap = Open area (%) <br /> Do = Outside diameter (inches) <br /> Surface area of blank casing = 2nR * L <br /> A=2n*12*12=904.78 inZ/ft <br /> % Open area = (55 in2/ft) / (904.78 inz/ft) = 0.0608.0.06 = 6% <br /> Flow capacity = 4.8 * (0.06 * 12 * 24 * n) = 261 gpm / ft <br /> Required riser flow: <br /> Maximum flow from 3 risers = 14,400 gpm / 3 = 4,800 gpm <br /> Minimum screen length: (4,800 gpm) / (261 gpm/ft) = 18.4 ft = 18.5 feet