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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 /21F + (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": I tank completely before the top of the tank is wetted Upper Tube Length = 6-1 /2" + (A) - 1 - 1 /2" as per EPA requirements. NOTE: You must find the actual tank capacity num- HOW TO LOCATE THE POSITION OF THE 71 SO AT ber that correlates to the 64 /2" + (A) depth for the 95% TANK CAPACITY station records. This number may also be used for (Shut-off points can be adjusted to anycapacity to the purposes of calibrating an electronic tank level comply with AHJ Requirements) system . The length of the upper tube and the placement of the Tape measure 71 SO valve body determine the shut-off point. Follow- 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 length of the riser pipe. All length measurements are in inches. t Riser Pipe INSTRUCTIONS with Face (A) Seal Adaptor To Tank 1 ) Find tank capacity (in gallons) from tank calibration Top (I . D. ) (B ) chart provided by tank manufacturer. To Tank 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, 5) Subtract the dipstick number (X) from the tank di- EXAMPLE ameter (Y) to find the upper tube reference number (Z) 1 ) Foran Owens-Corning Model G-3 Fiberglass® Tank Calibration Chart: (Y) - (X) _ (Z) Tank Capacity - 10,000 gal ., nominal 9,403 gal . 6) Subtract 2" from (Z) to find the upper tube depth NOTE: Use actual capacity only (C), 2) 95% of actual tank capacity = 0.95 x 9403 gal. _ (Z) - 2" = C 8933 gal . 3) The closest number which is less than 8933 gal . Is 7) Is C less than 6-1 /2"? 8910 gal. Choosing the closest numberless 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 95% 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