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PO Box 1928 STI SP-001 <br /> POWERS BENI94510 <br /> TEL 707707 333343400 STOCKTON EAST WATER DISTRICT STOCKTON,CA <br /> FAx 707 922 2284 <br /> ENGINEERING&INSPECTION,INC. www.powersei.com Gasoline Tank <br /> 4. Calculations <br /> 4.1 . Shell Thickness <br /> Shell Thickness Calculations per API 653 4.3.3.1 ©POWERS Engineering and Inspection,Inc.2019 <br /> Find: Minimum shell thickness(t min)for each shell course utilizing the API 653 standard for tanks less than 200 ft dia. <br /> Given: <br /> Variable Identifier Description Value Reference <br /> H Fill height(ft) 13.50 Measured from the base of each shell course(see column H in the table below) <br /> D Tank Diameter(ft) 8.50 <br /> G Specific Gravity 0.72 <br /> S Allow stress(psi) 24882 Reference API 653 Table 4-1 <br /> E Joint Efficiency 1.00 Reference API 653 table 4.2 for Welded and 4.3 for Riveted construction <br /> M 1.00 Temp Modifier 1.00 Reference API 650 Appendix M Elevated temperature modifier <br /> Solution: 10L <br /> Table for Calculating minimum shell thickness(t min)for each shell course <br /> H E S API 653 Required Calculation Actual Solution <br /> Product Type <br /> C <br /> o Height or 2.6(H-1)DG Req'd Minimum <br /> /Length Type of Joint Eff Unknown Maximum t min= t min Thickness Actual <br /> u Height/Length of each Above Joint for API 653 Tbl 4.2 Welded or Allowable SEM for Course Vs <br /> r Course Course each Course and 4.3 Riveted Stress Req'd <br /> s <br /> e I (in) (ft) (ft) % (psi) API 6534.3.3.1 (in) (in) OK? <br /> 2.6x(13.50-1)x8.50x0.72 <br /> 1 163.00 13.58333 13.50 Butt Weld 100% 1.00 A 36 24,882 0.1000 0.2400 Ok <br /> (24,882 x 1.00 x 1.00) <br /> 4.2 Next Inspection <br /> Interval Between Inspection <br /> AST Type Shop Fabricated ASTs <br /> Capacity 5000 gal <br /> Category Category 1 <br /> Inspection Schedule(SP001AST periodic AST Inspection <br /> Inspection Standard Table 5.5) <br /> STI-SP001 Stockton Water District TkNo Gasoline Stockton,CA 2019 Rev Dale Printed:214119 <br /> O..docx <br /> ©2018 PE&I Inc. <br /> Page 16 <br />