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Appendix C HOW TO LOCATE THE POSITION OF THE 71SO 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 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 1 . Find the tank capacity (in gallons) from the tank tali - bration chart provided by the tank manufacturer. Riser Pipewith Y 2. Calculate 95 % of capacity. Sea' A a (A) Sea , Adaptor To Tank 3 . Locate the 95 % volume number on the tank calibra= Top (i o 1 (B ) To Tank tion chart. I Bottom 4. Find the dipstick number (X ) which corresponds to _moi the 95 % tank volume. And, find the dipstick number Y (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 . S " 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"7 8910 gal . Choosing the closest number less than NO Upper tube length is E plus the distance from the 95 % of actual capacity ensures that complete 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" (Y1 - (X1 = (Z) (92 "- 82" = 1011 ) YES Upper tube length is 6 - 1 /2 " plus the riser pipe (Z) = 10" measurement (A) . 6. (Z) + 1 .5 " = E ( 10 " + 1 . 5 = 11 . 5 ") Upper Tube Length = & 1 /2" + (A) E - 115 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 = 6-7 !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 -1 /2" system. 23 I I I