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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- 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 elan Mount A anway Mtsunt —Tapernrasure Tape measure 71 SO valve body determine the shut-off point. Follow- ing the standard instructions for the OPW 71 SO will pro- } } } �- C,onsuhtank 's vide for initial shutoff at 95%. In all cases,the upper _ m��tarturer _- ' (A) A farhelghi ofY .i To Tank To Tank tube length must be a minimum of 6-1/2"plus the the manw" Top(.°.) aattom length of the riser pipe. All length measurements are in ! � (5"typical) ! ! S )A) inches. TO Tank 161 TopJI.D.) To Tank NOTE: When installing 71 SO and the actual measured + eom tank diameter is smaller than the tank diameter as des- ignated on the tank calibration chart, use the smaller dimension in determining your 95%capacity from. Figure 1 INSTRUCTIONS 1) Find tank capacity(in gallons)from tank calibration chart provided by tank manufacturer. EXAMPLE 2) Calculate 95%of capacity 3) Locate the 95%volume number on the tank calibra- 1) For an Owens-Corning Model G-3 Fiberglass®Tank tion chart. Calibration Chart: 4) Find the dipstick number (X)which corresponds to Tank Capacity- 10,000 gal., nominal 9,403 gal. the 95%tank volume. And,find the dipstick num- NOTE: Use actual capacity only ber(Y)which corresponds to the 100%volume. 2) 95%of actual tank capacity=0.95 x 9403 gal._ 5) Subtract the dipstick number(X)from the tank di- 8933 gal. ameter(Y)to find the upper tube reference number 3) The closest number which is less than 8933 gal.Is (Z). 8910 gal.Choosing the closest number less than (Y)-(X)=(Z) 95%of actual capacity ensures that the initial shutoff will occur when the tank is no more than 6) Subtract 2"from (Z)to find the upper tube depth 95%full. (Z)-2"=C 4) The calibration chart reading of 8910 gal.corre- 7) Is C less than 6-1/2"? sponds to a dipstick measurement of 82". NO Upper tube length is C plus the distance from the top of the Face Seal Adaptor installed on the riser pipe to the inside,top lip of the storage tank(A). 4