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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 G3 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 . / ' �A ;2 1 . Find the tank capacity (in gallons) from the tank cali- bration chart provided by the tank manufacturer. Riser Pipe with Face (A) 2. Calculate 95% of capacity. Seal Adapior To Tank B 3 . Locate the 95 % volume number on the tank calibra- Top (LD. ) To Tank tion chart. �'~� °�' � �� 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 S . Subtract the dipstick number (X) from the tank diam- eter (Y) to find the upper tube reference number (Z) . (Y) - (X) — (Z) g , 2 . 95% of actual tank capacity = 0.95 x 9403 gal . _ 8933 gal 6 . Add 1 . s " to (Z) to find the upper tube depth E. (Z) + 1 .5 " = E le 1p, eg� 3 . The closest number which is less than 8933 gal . Is 7 . Is E less than 61 /2"7 A/0 8910 gal . Choosing the closest numberless than 95 % of actual capacity ensures that complete NO Upper tube length is E plus the distance from the shutoff will occur when the tank is no more than top of the Face Seal Adaptor installed on the riser 95 % full . . pipe to the inside, top lip of the storage tank (A) . Upper Tube Length = E + (A) 4. The calibration chart reading of 8910 gal . corre- 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 It 82" = 10") (Z) = 10" YES Upper tube length is 61m1 /2" plus the riser pipe measurement (A) . 6. (Z) + 1 .5 " = E ( 10" + 15' = 11 .5") E = 115' Upper Tube Length = 6- 1 /2" + (A) 7 . is 11 .5 " less than 6- 1 /2"7 For testable models only,ding 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 nurn er may also be used or EUpper table models only, ending in "T": the purposes of calibrating an electronic tank level Tube Length = E + (A) — 7 - 1 /2" system. 23