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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 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 & 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. Riser Pipe with Face �A) 2 . Calculate 95 % of capacity. Q �� Is Seal Adaptor To Tank � e 3 . Locate the 95 % volume number on the tank calibra- Top ( l - D, ) To Tank tion chart. 00 .. + 5 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 . ii l 3 /% 5 . Subtract the dipstick number (X) from the tank diam- eter (Y) to find the upper tube reference number (Z) . (Y) - (X) — (Z) Ii $ _ .3 }- tj • - ► l) I� , } 5 � • 2 . 95 % 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 j i . > 6 5 — 2 = C� > b 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) . � S � ( 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 " M - (X) _ (Z) (92 "- 82 = 10 ") (Z) = 10 " YES Upper tube length is 6- 1 /2" plus the riser pipe 6 . (Z) + 1 .5 " = E ( 10 " + 1 .5 " = 11 .5 ") measurement (A) . E = 11 .5 " Upper Tube Length = 6- 1 /2 " + (A) 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 A /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) bey 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 A /2 " system . 23