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� � 1 � ,� � <br />�. •- e <br />The shut off point is detem�ined by the length of <br />the 61S0 upper tube. Following the standard <br />instructions forthe OPW 61 -SO will provide for <br />initial shutoff at 95% of capacity in most 8' , , <br />diameter underground storage tanks. For other <br />diameter tanks, follow the procedure below to <br />determine proper length of the upper tube. In all <br />cases; the upper tube length must be a minimum <br />of 6-1/2" plus the length ofthe riser pipe. Ali <br />length measurements are in inches. <br />INSTRUCTIONS <br />1.) Find tank capacity (in gallons} from tank <br />calibration chart provided by tank manufacturer. <br />2.) Calculate 95°� of capacity. <br />3.) Locate the 95%volume number on the tank <br />calibration chart. <br />4.) Find the dipstick number (X) which <br />corresponds to the 95%volume number. <br />5.) Subtract the dipstick number (X) from the tank <br />diameter (lt7 to find the upper tube reference <br />number (�. <br />m - (x} _ (� <br />6.) Subtract 2 from the upper tube reference <br />number (z7 to find the upper tube depth number <br />(�). <br />(Z) - 2" = C <br />7.) Is C less than 6-1/2"? <br />NO Upper tube length is the upper tube <br />depth number C plus the riser pipe <br />measurement (A). <br />Upper Tube Length = C + (A) <br />1fSS Upper tGbe length is 6-1f2" plus the riser <br />pipe measurement (A). <br />Upper Tube Length =6-1/2" + (A) <br />® Registered T.M. -Owens Coming Fiberglass Corporation <br />3 <br />149easuring <br />Stick <br />_s <br />. (B) <br />To Tank <br />Riser. � (A) Bottom <br />Pipe To Tank <br />Top (i.D.) <br />1.) Foran Owens -Coming Model G-3 <br />Fiberglass® Tank Calibration Chart: <br />Tank Capacity -10,000 gal. nominal (9,403 gal. <br />actual) <br />2.) 95% of actual tank capacity = 0.95 x <br />9403 gal. = 8933 gal. <br />3.) The closest number which is less than 8933 <br />gal. Is 8910 gal. Choosing the closest number <br />less than 95% of actual capacity ensures that the <br />initial shutoff will occur when the tank is no more <br />than 95%full. <br />4.) The calibration chart reading of 8910 gal. <br />corresponds to a dipstick measurement of 82". <br />5.) Dipstick number ()C) = 82" <br />Tank diameter m = 92" <br />Uppertube reference number (27 =10" <br />6.) (z7 =10" (from Step 5) <br />(�-2"=C 10"-2"=8" <br />C = 8" <br />7.) is C = 8"(from Step 6) less than 6-1/2"? <br />NO Measure the riser pipe length (A). <br />Upper tube length = C + (A) <br />C = 8" (from Step 6) <br />Uppertube length = 8" +riser pipe <br />length (A). <br />