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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 6- 1 /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-offpoints can be adjusted to any capacity to system , comply with AHJ Requirements) The length of the upper tube and the placement of the Tape measure 71 SO valve body determine the shut-off point. Follow- �rL 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 ) Seal Adaptor To Tank 1 ) Find tank capacity ( in gallons) frpm tank calibration Top (I . D . ) To (Tank 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 G3 Fiberglass "' Tank (Z) • Calibration Chart : (Y) - (X) _ (Z) Tank Capacity - 10,000 gal ., nominal 9,403 gal . NOTE: 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) - 2 " = C 3 ) The closest number which is less than 8933 gal . Is 7) Is C less than 6 - 1 /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 g5 % full . the top of the Face Seal Adaptor installed on 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