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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; 50%= Dipstick Number on Tank Chart that corresponds to 100%volume(Y)- (y) Dipstick Number on Tank Chart that corresponds to SO%{X}_ � 0 (x) Upper Tube Reference Number Z=Y-X (2) Upper Tube Depth Inside Tank C=Z-2'. 2 Distance from top sealing surface for 71 SD Up'to inside the 0 (C) top of Storage Tank' A= 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 1 No If NO,Upper Tube Length(D)=C+A- 1 1/2" If YES,Upper Tube Length(D)=6'/z"+A- 1 '/z" Upper Tube Length= ' Sealing surface may be the top of the Face Seell Adaptor the buifr in sealing ledge inside same cpol containers,or on non-vapor tight applications the top of the pipe nipple 2 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 -1 This measurement is taken from the seam where the upper tube is attached to the valve body to the Inside of the tank top, 19