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6 <br />Al2pend ix A <br />71 SO Overfill Valve Upper Tube Calculation Worksheet <br />Important. This is meant to be supplemental worksheet and not a substitute to following the installation <br />manual instructions. All length measurements are in inches. Please contact the Authority Having Jurisdic- <br />tion (AHJ) and review local, state, and national codes to determine the regulatory requirements governing <br />shut-off capacity in your region, as well as take into account other considerations such as extreme tank tilt. <br />D <br />Desired tank capacity for shut-off: SO°/4-M/0 <br />Dipstick Number {Y} on Tank Chart that corresponds to 140% volume = (y) <br />Dipstick NumIDer on Tank Chart that corresponds to 50% (X) = � (X) <br />Upper Tube Reference Number Z=Y-X l' (2) <br />Upper Tube Depth inside Tank C = Z-2" <br />Distance from top sealing surface for 71 SO Lip' to inside the © (C) <br />top of Storage Tank2 A= - 8f-5 - <br />For Non -Testable 71 SO models oni <br />In a I I cases for non -testable 71 SO models, the top of the valve body must protrude at least 61/2" into the tank to <br />provide a minima} clearance for proper operation.' Additionally the total Upper Tube Length must be at least 16" <br />of length to include the protective bend in the tube. <br />Is C less than 6'/2" Yes 1 No <br />If NO, Upper Tube Length (D)= C f A <br />If YES, Upper Tube Length [D)= 6172 "+ A <br />Upper Tube Length = <br />For Testable 71 SO models only <br />In alt cases for Testable 71 SO modeis, the top of the valve body must protrude at least 61/2" into the tank to provide <br />a minimal clearance for proper operation.' Additionally the total Upper Tube Length must beat least 14'/x" of <br />length to include the protective bend in the tube. <br />Is C fess than 6 112" Yes / 9 <br />If NO, Upper Tube Length (D)= C f A -- 1 1/2 " <br />If YES, Upper Tube Length (D) = 61/2" + A —1 1/2 - <br />Upper Tube Length = <br />Sealing surface may be the top of the Fare Seal Adaptor, the built in sealing ledge inside some spill containers, or on non -vapor <br />tight applications the top of the pipe nipple <br />r Some Underground Storage tanks utilize a man way system at the top, Make sure to use the top of the storage tank for meosure- <br />mentcrud not to top of the manway, Consult your underground took manufacturer for height of the manway <br />' This measurement is taken from the seam where the upper tube is attached to the valve body to the inside of the tank top. <br />tic <br />