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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 AH1 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 pie 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 r 1 1 . Find the tank capacity (in gallons) from the tank cali- bration chart provided by the tank manufacturer. Riser Rpe 2. Calculate 95x/0 of ca acit . wiui Face (A) P Y Seal Adaptor To Tank 3 . Locate the 95% volume number on the tank calibra- Top (I .D. ) (©) To Tank tion chart. 130Bom 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 M to find the upper tube reference number (Z). (Y) - (X) = (Z) 2. 95x/0 of actual tank capacity = 0.95 x 9403 gal. _ 6. Add 1 .5" to (Z) to find the upper tube depth 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"? 8910 gal. Choosing the closest number less 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") YES Upper tube length is 6- 1 /2" plus the riser pipe (Z) = 10" measurement (A). 6. (Z) + 1 .5" = E (10" + 105" = 1145") Upper Tube Length = 6-1 /2" + (A) E = 11 .5" 7. Is 11 .5" less than 6-1 /2" ? 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 61 /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 system. 23