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PO Box 1928 STI SP-001 <br /> POWERS BENI94510 <br /> TEL 707707333343400 STOCKTON EAST WATER DISTRICT STOCKTON,CA <br /> FAx 707 922 2284 <br /> ENGINEERING&INSPECTION,INC. www.powersei.com Tank 19 <br /> 4. Calculations <br /> 4.1 . Shell Thickness <br /> Shell Thickness Calculations per API 653 4.3.3.1 ©POWERS Engineering and Inspection,Inc.2018 <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) 32.00 Measured from the base of each shell course(see column H in the table below) <br /> D Tank Diameter(ft) 8.00 <br /> G Specific Gravity 0.82 <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: lgail <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 Height orMinimum <br /> 0 2.6(H-1)DG Req'd <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 (in) (ft) I (ft) I I % (psi) I API 6534.3.3.1 (in) (in) OK? <br /> 2.6x(28.00-1)x8.00x0.82 <br /> 1 96.00 8 28.00 Butt Weld 100% 1.00 A36 24,882 0.1000 0.1710 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 10000 gal <br /> Category Category 1 <br /> Inspection Schedule(SP001 AST periodic AST Inspection, External Inspection(20) <br /> Inspection Standard Table 5.5) <br /> STI-SP001 Stockton Water District Tk 19 Stockton,CA 2019 Rev O..docx Date Printed:2/4/19 <br /> ©2018 PE&I Inc. <br /> Page 16 <br />