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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 - U per tube must protrude into the tank at least 61 /2 " peer Tube Length = 6- 1 /2 " + (A) 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 ) (0) (C) ' NOTE : You must find the actual tank capacity num- ber that depth for the HOW TO LOCATE THE POSITION OF THE 71 SO AT station records .tes 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 7150 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 Seal Adaptor (A ) 1 ) Find tank capacity (in gallons) fr9m tank calibration To Tank (B ) chart provided by tank manufacturer. Top (LD r ) To Tank tt 2) Calculate 95 % of capacity Boom 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 1 ) For an Owens-Corning Model G3 Fiberglass ® Tank (Z) . 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 . _ 8933 gal . 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 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