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This is an example shown with an 8 foot diameter 10 ,000 gallon tank <br /> 1 . Tank Diameter is TD TD= 96 <br /> 2 . Tank Capacity is TC TC= 10 ,000 <br /> 3 . Desired Shutoff Percentage (Note NFPA Guidelines) SO% = 95% <br /> 4 . Shutoff Tank Capacity TC@ shutoff % = TC x 0 . 95 10 , 000 x 0 . 95 = 91500 <br /> 5 . Tank Level from Stick Chart for Shutoff Capacity (95% ) TL@95%_ 87 <br /> 6 . Tank " B" Dimension B = TD - TL@95% B= 96-87 = 9 <br /> 7 . Distance from top seal surface ( 1 ) to the top (inside ) of the tank (2 ) is A A= 40 <br /> 8 . Length of OPV top tube to (95 % mark) on the A1100 is C - C = A+ B See <br /> Picture, Measure C distance from the 95 % line on valve and cut top tube C= 40 + 9 49 <br /> 9 . Distance from the top seal surface ( 1 ) to the tank bottom is D D = Tank Dia + A D= 96 +40 136 <br /> 10 . OPV Assembly Overall Length OAL = D=6 inches . Screw together top and <br /> bottom tube assemblies . Measure from top tube end and cut bottom tube either <br /> straight or 45 degree at operators preference . (See diagram to insure the 6 " <br /> maximum clearance is maintained ) OAL = 136-6 130 <br /> Tank Chart for a 10 , 000 gallon 8 foot diameter tank at 95 % Capacity = 9500 gallons <br /> In . Ga . In . Ga . In . Ga . <br /> 1 18 41 4086 81 9026 <br /> 2 50 42 4218 82 9122 <br /> 3 94 43 4350 83 9214 <br /> 4 140 44 4482 84 9304 <br /> 5 200 45 4614 85 9390 <br /> 6 260 46 4748 86 9472 <br /> 7 328 47 4880 87 9552 <br /> 8 400 48 5014 88 9628 <br /> 9 474 49 5146 89 9700 <br /> 10 554 50 5280 90 9766 <br /> 11 638 51 5412 91 9828 <br /> 12 724 52 5544 92 9884 <br /> 13 812 53 5678 93 9934 <br /> 14 906 54 5810 94 9976 <br /> 15 1000 55 5942 95 10008 <br /> 16 1098 56 6072 96 10026 <br /> 17 1198 57 6204 <br /> 18 1302 58 6334 <br /> 19 1406 59 6464 <br /> 20 1514 60 6592 <br /> 21 1622 61 6722 <br /> 22 1722 62 6848 <br /> 23 1846 63 6976 <br /> 24 1960 64 7102 <br /> 25 2076 65 7226 <br /> 26 2194 66 7350 <br /> 27 2312 67 7472 <br /> 28 2432 68 7594 <br /> 29 2554 69 7714 <br /> 30 2676 70 7834 <br /> it <br /> II <br />