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HOW TO LOCATE THE POSITION OF THE 71SO 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 r . 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 tank To Tank calibration chart provided by tank manufacturer. Bottom 2 . ) Calculate 95 % of capacity . 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® Tank Calibration Chart : 5 . ) Subtract the dipstick number (X) from the tank Tank Capacity - 10 , 000 gal . , nominal 9 , 403 gal . diameter (Y) to find the upper tube reference 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) 1 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) . 7 . ) (Z) - 2 C ( 10" - 2" = 811) Upper Tube Length = 6- 1 /2" + (A) C - 811 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 NO Measure the distance from the top of the be used for the purposes of calibrating an FSA-400 Face Seal Adaptor installed on the electronic tank level system . 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) I 64 I