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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 t%.?O�f'& sss A ss uaxwaw ►a 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- Ujap"1 `i 'uEie 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 shutoff 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) 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 6-1 /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. S)tERr r 5 c rpg �yArsot_730 $ ' NAI, Riser Pipe INSTRUCTIONS with Face (A) 1 ) Find tank capacity Seal Adaptor nk p ry in gallons) To Ta ( g Ins) from tank calibration Top p , p . ) (B ) chart provided by tank manufacturer. 24+870 GAL . To Tank 2) Calculate 95% of capacity 23, '72 ! . $0 &AL Bo m 3) Locate the 95% volume number on the tank calibra- tion chart. 107 P3/1k u 4) Find the dipstick number (X) which corresponds to Ll the 95% tank volume. And, find the dipstick num- Figure I 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 1 ) For an Owens-Corning Model G-3 Fiberglassm Tank t1q ! n '7t2 " Calibration Chart: M - (X) - (Z) Tank Capacity - 10,000 gal., nominal 9,403 gal. 6) Subtract 2 " from (Z) to find the upper tube depth NATE: Use actual capacity only (C) . SM P & TE 2) 95 % of actual tank capacity = 0.95 x 9403 gal . _ (Z) - 2" = CZ.. 1 " s C 8933 gal . 7) Is C less than 6- 1 /2 " 7 M t b/ u 3) The closest number which is less than 8933 gal , is I z 3b IWR 4 P 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