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HOW TO LOCATE THE POSITION OF THE 71 SO AT 95% TANK CAPACITY Measuring Stick The length of the upper tube and the placement of the 71 SO valve body determine the shut-off point. Following the standard instructions for the OPW 71 SO will provide 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 Top(I.D.) (B) 1.) Find tank capacity(in gallons)from tankTo Tank calibration chart provided by tank manufacturer. Bottom 2.) Calculate 95% of capacity. L � )( 3.) Locate the 95% volume number on the tank T calibration chart. 4.) Find the dipstick number(X)which corresponds Figure 1 to the 95% tank volume. And, find the dipstick number(Y)which corresponds to the EXAMPLE 100%volume. 1.) For an Owens-Corning Model G-3 Fiberglass® 5.) Subtract the dipstick number(X)from the tank Tank Calibration Chart: diameter Y to find the upper tube reference Tank Capacity- 10,000 gal., nominal 9,403 gal. ( ) pp NOTE: Use actual capacity only number(Z). (Y)- (X) = (Z) 2.)95% of actual tank capacity = 0.95 x 6.) Subtract 2"from (Z)to find the upper tube depth 9403 gal. = 8933 gal. (C)_ 3.)The closest number which is less than 8933 gal. (Z)- 2" = C Is 8910 gal. Choosing the closest number less than 95% of actual capacity ensures that the 7.) Is C less than 6-1/2"? initial shutoff will occur when the tank is no more than 95% full. NO Upper tube length is C plus the distance from the top of the Face Seal Adaptor 4.)The calibration chart reading of 8910 gal. installed on the riser pipe to the inside, top corresponds to a dipstick measurement of 82". lip of the storage (A). 5.) Dipstick number(X) = 82" Upper Tube Length = C + (A) Tank diameter(Y) = 92" (Y)- (X) = (Z) (92 "- 82" = 10") YES Upper tube length is 6-1/2" plus the riser (Z) = 10" pipe measurement (A). 6.) (Z)- 2" = C (10" -2" = 8") Upper Tube Length = 6-1/2" + (A) C = 8" NOTE: You must find the actual tank capacity 7.) Is 8" less than 6-1/2"? number that correlates to the 6-1/2"+(A)depth for the station records. This number may also be used NO Measure the distance from the top of the for the purposes of calibrating an electronic tank level system. FSA-400 Face Seal Adaptor installed on the riser pipe to the inside, top lip of the storage tank and obtain measurement (A). ®Registered T.M.-Owens Corning Fiberglass Corporation Upper tube length = C + (A) OPW 71 SO Overfill Prevention Valve Page 4