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g • " 71 SO Overfill Valve Upper Tube Calculation Worksheet Important: This is meant to be supplemental worksheet and not a substitute to following the installation manual instructions. All length measurements are in inches. Please contact the Authority Having Jurisdic- tion (AHJ) and review local, state, and national codes to determine the regulatory requirements governing shut-off capacity in your region, as well as take into account other considerations such as extreme tank tilt. Desired tank capacity for shut-off: Dipstick Number on Tank Chart that corresponds to 100% volume (Y) _ Dipstick Number on Tank Chart that corresponds to SO% (X) _ Upper Tube Reference Number Z=Y-X Upper Tube Depth Inside Tank C = Z-2" Distance from top sealing surface for 71 SO Lip' to de the top of Storage Tank2 A= For Non -Testable 71 SO models only In all cases for non -testable 71 SO models, the top of the valve body must protrude at least 6'/z" into the tank to provide a minimal clearance for proper operations Additionally the total Upper Tube Length must beat least 16" of length to include the protective bend in the tube. Is C less than 6'/z" Yes / No If NO, Upper Tube Length (D)= C + A If YES, Upper Tube Length (D)= 61/2 "+ A Upper Tube Length = For Testable 71 SO models only In all cases for Testable 71 SO models, the top of the valve body must protrude at least 6'/z" into the tank to provide a minimal clearance for proper operations Additionally the total Upper Tube Length must beat least 141/2" of length to include the protective bend in the tube. Is C less than 5" Yes / No If NO, Upper Tube Length (D)= C + A - 1 1h " If YES, Upper Tube Length (D) = 61/2" + A - 1 Yz " Upper Tube Length = Sealing surface maybe the top of the Face Seal Adaptor, the built in sealing ledge inside some spill containers, or on non - vapor tightapp/ications the top ofthe pipe nipple 2 Some Underground Storage tanks utilize a man way system at the top. Make sure to use the top of the storage tank for measurementandnottotopofthemanway. C-onsultyourunderground tank manufacturer for height ofthe man way 3 This measurement is taken from the seam where the upper tube is attached to the valve body to the inside of the tank top.