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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" 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. Riser Pipe INSTRUCTIONS with Face (A) 1) Find tank capacity(in gallons)from tank calibration Top p.Seal Adaptor To Tank nk (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