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Appendix C HOW TO LOCATE THE POSITION OF THE 71 SO FOR COMPLETE SHUT -OFF AT A GIVEN TANK CAPACITY Note : This Appendix only applies when AHJ require- EXAMPLE ments call for complete shut-off at a given tank capacity. 1 . For an Owens-Corning Model G-3 Fiberglass` Tank See page 4 for standard measurements , Calibration Chart : The length of the upper tube and the placement of the Tank Capacity 10,000 gal ., nominal 9,403 gal . 71 SO valve body determine the shut-off point. The sam- NOTE : Use actual capacity only ple calculation below will provide for complete shut-off _ at 95 % . In all cases, the upper tube length must be a Tape measure minimum of 6- 1 /2" plus the length of the riser pipe. All length measurements are in inches . INSTRUCTIONS 140 'e 1 . Find the tank capacity (in gallons) from the tank cali- bration chart provided by the tank manufacturer. Riser Pipe with Face '>(Ar) 2. Calculate 95% of capacity. z . Seal Adaptor To Tank 3 . Locate the 95% volume number on the tank callbra- Top,(1 . 13. ) To(Tank tion chart. t._ Bottom 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 diam- eter (Y) to find the upper tube reference number (Z (Y) - (X) _ (Z) :" �~ 2 . 95% of actual tank capacity = 0.95 x 9403 gal . _ 6. Add 1 . 5 " to (Z) to find the upper tube de E. 8933 gal . (Z) + 1 .5 = E 3 . The closest number which is less than 8933 gal . Is 7. Is E less than 6- 1 /2" 02 '�' o 8910 gal . Choosing the closest number less than 95% of actual capacity ensures that complete NO Upper tube length is E pl he distance from the shutoff will occur when the tank is no more than top of the Face Seal A ptor installed on the riser 95% full . . pipe to the inside, lip of the storage tank (A). Upper Tube Length = E + (A) 4. The calibration chart reading of 8910 gal . corre- a n sponds to a dipstick measurement of 82". For testable models only, ending in "T": 5 . Dipstick number (X) = 82" Upper Tube Length = E + (A) — 1 - 1 /2" Tank diameter (Y) = 92 " (Y) - (X) _ (Z) (92 "- 82" = 10") (Z) YES Upper tube length is 6- 1 /2 plus the riser pipe measurement (A) , 6 . (Z) + 1 .5 " = E ( 10" + 1 . 5 = 11 .5 ") Upper Tube Length = 6- 1 /2" + (A) E = 11 .5 " 7 . Is 11 .5 " less than 6- 1 /2" 7 For testable models only, ending in "T" : NO Measure the distance from the top of the FSA-400 Upper Tube Length = 6 - 1 /2" + (A) - 1 - 1 /2 " Face Seal Adaptor installed on the riser pipe to the inside, top lip of the storage tank and obtain measurement (A) . NOTE : You must find the actual tank capacity num- Upper tube length = E + (A) ber that correlates to the 6 - 1 /2" + (A) depth for the station records . This number may also be used or For testable models only, ending in "T the purposes of calibrating an electronic tank level Upper Tube Length = E + (A) - 1 - 1 /2" systems. 23