Page 1 of 14Rectangular tank sizing CalculationObjectives- To calculate the thickness of tank plates- To determine the size of stiffening frame for tank- To determine dry and test weights

Assumptions- Specific gravity of liquid is 1- Acceleration due to gravity is 9.81 m/s- Density of steel is 7850 kg/m- Minimum Distance between stiffeners = 1.05m

References1. UL-142, Steel Aboveground Tanks for flammable and combustible liquids,Underwriters Laboratories Inc.

2Publishing Inc.3 Corus Construction and IndustrialStructural Sections to BS 4: Part 1:1993& BS EN 10056:19994 ASME Boiler and Pressure Vessel Code Section II subpart D5 Trauvay and Cauvin (2001), Piping Equipment

67th ed., McGraw-Hill. 20027 ASME B31.10M - 2000: Welded and Seamless Wrought Steel Pipe8 ASME B.16.5 - 2009: Pipe Flanges and Flanged Fittings

Notes1 A total of 10 Stiffeners were used based on a spacing of 1.05 m on the longsides (3 stiffeners on each longer side; and 2 stiffeners on each shorter side)2 Sump Pump weight was not included in calculations3 Weights are calculated weights. Final weights to be advised by vendorWeight calulation does not include weir.Acceleration due to gravity is 9.81 m/s

2

3Eugene F. Megyesy, Pressure Vessels Handbook, Pressure VesselsYoung, W. C. & Budynas, R. G. (2002) Roark's Formulas for Stress and StrainPage 2 of 14

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1 A total of 10 Stiffeners were used based on a spacing of 1.05 m on the longsides (3 stiffeners on each longer side; and 2 stiffeners on each shorter side)

Definition of Terms- a Length of top plate- b Width of top plate- CA Corossion Allowance- E Modulus of Elasticity- g Gravitational acceleration- H Height of tank- Minimum Moment of inertia of top edge stiffening- L Length of tank-lSpacing between vertical stiffeners- Spacing of bottom plate support- R Reaction at top edge- r Radius of contact of heaviest dead weight on top tank- S Allowable stress of tank material- t Required thickness- Selected thickness- w Load- W Heaviest Dead weight on top plate- Minimum Section Modulus of vertical stiffener- α Factor Depending on ratio of Length to Width of top plate a/b- β Factor Depending on ratio of Height to Length H/LDensity of tank materialρ Density of liquid in tankν Poisson ratio of tank materialCSA Cross-Sectional Area

Page 5 of 14Equipment Tag No. ABH 8000 Project No. 1216 No. of equipments1 DESIGN DATATank Material SA-516 Gr. 60Modulus of Elasticity E = 203.4E+09Allowable Stress S = 117.9E+06Density of tank material = 7850Tank Dimensions:Length L = 4.2 mWidth W = 3 mHeight H = 2.4 mType of Liquid WaterSpecific Gravity = 1Density of liquid ρ = 1000Acceleration due to gravity g 9.81No. of vertical stiffeners one side = 3Maximum Distance between Stiffners l = 1.05 mCorrosion Allowance CA = 3 mmHeight/length ratio (H/L) = 0.5714Factor for H/L β = 0.095 (See Appendix)2 SIDE PLATE THICKNESSRequired Plate Thickness = 0.004573343 m= 4.57 mmThickness + Corossion Allowance = 7.57 mmSelected Plate thickness = 8 mm3 LOAD= 28252.8 N/m= 28.25 N/mm4 VERTICAL STIFFENINGMinimum Section Modulus

77.538An equal angle L-section of dimensions150 x 150 x 15 (section modulus = 83.5frame is satisfactory for vertical stiffeningTotal no. of vertical stiffeners = 10 (Note 1)N/m2N/m2N/m2N/m2ρpρpkg/m3kg/m3kg/m

3kg/m3m/s2m/s2tscm

3cm

3)