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Appendix A 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 Up' to inside the top of Storage Tank2 A= Q (C) For Non -Testable 7750 rnodeis gnly In all cases for non-testabie 71 SO models, the top of the valve body must protrude at least 61/2" into the tank to provide a minimal clearance for proper operation.3 Additionally the total Lipper Tube Length must beat least 16" of length to include the protective bend in the tube. Is C less than 61/2" Yes 1 No If NO, Upper Tube Length (D)= C + A If YES, Upper Tube Length (D)= 6112 "+ A Upper Tube Length For TestabiglISO ragdels only In all cases for Testable 7150 models, the top of the valve body must protrude at least 6'12" into the tank to provide a minimal clearance for proper operation.3 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 1/2 " If YES, Upper Tube Length (D) = 6'/2" + A -- 1 '/z " Upper Tube Length = ' Sealing surface may be the top of the Face Seal Adaptor the buil€ in sealing ledge inside same cpol containers, or on non -vapor tight applications the top of the pipe nipple 7 Some Underground Storage tanks utilize a manway system of the top. Make sure to use the top of the storage tank Fnr measure- ment and not to top of the manway. Consuityour underground tank manufacturer for height of the manway ' This measurement is taken from the seam where the upper tube is attached to the valve body to the Inside of the rank top, 19