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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 = 61 /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 61 /2 " + (A) depth for the 95 % TANK CAPACITY station records . This number may also be used for (Shut-off points can be adjusted to any capacity 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 . Riser Pipe INSTRUCTIONS with Face (A ) 1 ) Find tank capacity ( in gallons) from tank calibration Seal Adaptor To Tank (ank ank (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 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 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