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