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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 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 1. Find the tank capacity(in gallons)from the tank cali- bration chart provided by the tank manufacturer. Riser Pipe with Face 2. Calculate 95%of capacity. seal adaptor (A) To Tank (B) 3. Locate the 95%volume number on the tank calibra- Top(I.D_) 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. 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 1.5"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 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" (Y)-(X)_(Z) (92 "-82"= 10") 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 =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)- 1-1/2Face 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 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