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Appendix C HOW TO LOCATE THE POSITION OF THE 71 SO FOR COMPLETE SHUT-OFF ATA 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 71 SO valve body determine the shut-off point. The sam- ple calculation below will provide for complete shut-off 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 the tank capacity (in gallons) from the tank cali- bration chart provided by the tank manufacturer. 2. Calculate 95% of capacity. 3. Locate the 95% volume number on the tank calibra- tion 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 diam- eter (Y) to find the upper tube reference number (Z). (Y) - (X) _ (Z) 2 6. Add 1.5" to (Z) to find the upper tube depth E. (Z)+1.5"=E 7. Is E less than 6-1/2"? NO Upper tube length is E plus the distance from the top of the Face Seal Adaptor installed on the riser pipe to the inside, top lip of the storage tank (A). Upper Tube Length = E + (A) For testable models only, ending Upper Tube Length = E + (A) - 1- r/2" YES Upper tube length is 6-1 /2" plus the riser pipe measurement (A). Upper Tube Length = 6-1/2" + (A) For testable models only, ending Upper NOTE: You must find the actual tank capacity num- berthat correlates to the 6-1 /2" + (A) depth for the station records. This number may also be used or the purposes of calibrating an electronic tank level system. Tank Capacity - 10,000 gal., nominal 9,403 gal. NOTE: Use actual capacity only Riser Pipe with Face Seal Adaptor Tape measure To Tank �B) Top (I.D.) To Tank 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 complete shutoff will occur when the tank is no more than 95% full. 4. The calibration chart reading of 8910 gal. corre- sponds to adipstick measurement of 82". 5. Dipstick number (X) = 82" Tank diameter (Y) = 92" (Y) - (X) _ (Z) (92 "- 82" = 1011) (Z) = 10" 6. (Z)+1.5"=E (10"+1.5"=11.5") 7. Is 11.5" 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 = E + (A) For testable models only, ending in "T": Upper Tube Length = E + (A) - 1-1 /2" 23