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IMPORTANT: The instructions below for the 71 SO Upper Tube Length = C + (A) Overfill Prevention Valve are written for the initial stage shutoff at 95%, but can be adjusted to shutoff For testable models only, ending in "T" : at any desired tank capacity. Please contact the Au- Upper Tube Length = C + (A) — 1 - 1 /2" thority Having Jurisdiction (AHJ ) and review local, state, and national codes to determine the regulato- YES Upper tube length is 6- 1 /2 " plus the riser pipe ry requirements governing shut-off capacity in your measurement (A) , region, as well as take into account other considera- tions such as extreme tank tilt. in all cases, the up- Upper Tube Length = 6- 1 /2" + (A) per tube must protrude into the tank at least 61 /2" to ensure that the valve can shut off flow into the For testable models only, ending in "T": tank completely before the top of the tank is wetted Upper Tube Length = 6- 1 /2" + (A) - 1 - 1 /2" consistent with EPA requirements 40 CFR 280.20 (c) ( 1 ) (ii ) (C) . NOTE: You must find the actual tank capacity num- ber that correlates to the 61 /2" + (A) depth for the HOW TO LOCATE THE POSITION OF THE 71 SO AT station records. This number may also be used for "! 95% TANK CAPACITY the purposes of calibrating an electronic tank level (Shut-off points can be adjusted to any capacity to system , comply with AHJ Requirements) The length of the upper tube and the placement of the lTape measure 71 SO valve body determine the shut-off point. Follow- L ing the standard instructions for the OPW 71 SO will pro- vide for initial shutoff at 95%. In all cases, the upper tube length must be a minimum of 6- 1 /2" plus the � I length of the riser pipe. All length measurements are in inches. Riser Pipe INSTRUCTIONS with Face (A) Seal Adaptor To Tank 1 ) Find tank capacity (in gallons) from tank calibration Top (I . D . ) To (TBank chart provided by tank manufacturer. Bottom 2) Calculate 95 % of capacity 3 ) Locate the 95 % volume number on the tank calibra- tion chart. 4) Find the dipstick number (X) which corresponds to the 95% tank volume. And, find the dipstick num- Figure 1 ber (Y) which corresponds to the 100% volume. EXAMPLE 5 ) Subtract the dipstick number (X) from the tank di- ameter (Y) to find the upper tube reference number 1 ) For an Owens-Corning Model G-3 Fiberglass® Tank (Z) • Calibration Chart. (y) _ (X) _ (Z) Tank Capacity - 10,000 gal ., nominal 9,403 gal . NATE: Use actual capacity only 6) Subtract 2" from (Z) to find the upper tube depth 2) 95% of actual tank capacity = 0.95 x 9403 gal . _ (C) ' 8933 gal . (Z) m2 = C 3) The closest number which is less than 8933 gal . Is 7) Is C less than 6m1 /2"7 8910 gal . Choosing the closest number less than 95 % of actual capacity ensures that the initial NO Upper tube length is C plus the distance from shutoff will occur when the tank is no more than the top of the Face Seal Adaptor installed on 9510 full . the riser pipe to the inside, top lip of the storage 4) The calibration chart reading of 8910 gal. corre- tank (A) . sponds to a dipstick measurement of 82". 4 i