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OPW 71 SO Overfill Prevention Valve Appendix Ain service SO height worksheet <br /> Tank 2 <br /> Finding OPW 71 SO shutoff setting using measurements used for Appendix A installation worksheet. <br /> D = OPV upper tube from upper sealing lip to seam . <br /> A= Distance from top sealing surface for 71 SO lip to inside the top of storage tank, or"Riser". <br /> Y=Tank overall diameter <br /> X= Dipstick number on chart that corresponds to gallons. <br /> Divide Gallons at shutoff/total gallons multiply by 100 to get SO% <br /> Measure (D)99.125 <br /> Find (A) dimension.* 95 <br /> Subtract(A) from (D) _ (C) 99.125 - 95 =4.125 <br /> Add 2"to (C) _ (Z) 2 + 4.125 = 6.125 <br /> (D) (A) <br /> Subtract (Z)from (Y) _ (X) 48 - 6.125 = 41.825 Tuber Riser <br /> (X) in inches from tank chart41.825 <br /> (W)Valve <br /> (X) in Gallons from tank chart 904 Length, <br /> bottom of <br /> cut <br /> (Y) in Gallons from tank chart 971 (B) <br /> To Tan k <br /> SO%_ (X) gallons/(Y) gallons x 100 93.09 (Y) <br /> Tank <br /> (U)Valve Chart <br /> Length, 100% <br /> top of cut Volume <br /> Dipstick <br /> *A dimension* may have a manway, or a protruding bung fitting. Several measurements may be required <br /> to verify that what you are measuring from, or calculating your riser measurement from, is the actual <br /> inside top surface of the tank. <br />