Lekhraj(API 650)

STORAGE TANK DESIGN CALCULATION - API 650 1 Tank Detail Liquid = Water Density /kg/m3 = 1000 Roof = Close Type of roof = Internal Floating Roof Diameter of tank /m = 12 Height of tank /m = 12 Capacity of tank /m3 = 1356.48 Corrosion allowance /CA = 1.5 Height ofplate /m = 1.8 Width ofplate /m = 6 Number of courses = 7 Circumference = 37.6991118430775 No. of plates per couses = 7 No. of plates required for shell = 49 2 Materials Component Shell Plate Annular Plate Bottom Plate Roof Plate Material E275 E275 E275 E275 Nominal plate thickness,t /mm t<16 t<16 16<t<40 16<t<40 Min yield strength /MPA 275 275 265 265 Min tensile strength /MPA 410 410 410 410 Product design stress sd /MPA 164 164 164 164 Hydrostatic test stress st /MPA 176 176 176 176 3 SHELL THICKNESS CALCULATION BY ONE-FOOT METHOD Design shell thickness, Hydrostatic test shell thickness, 3.1 Data Height of bottom course, H1 = 1.8 m Specific Gravity of Fluid to be Stored, G = 1 Nominal Dia. of Tank, D = 14 m l Design Liquid Level, H = 14 m Corrosion Allowance, CA = 1.5 Allowable Stress for Design Condition, Sd = 164 MPA ` Allowable Stress for Hydrostatic condition, St = 176 MPA 3.2 Result No. of courses Selected thickness, t/mm Nominal thickness/ mm 1 7.23 5.34 7.23 8 8 2 6.48 3.94 6.48 8 8 3 5.72 3.24 5.72 6 6 4 4.97 2.53 4.97 6 6 5 4.22 1.83 4.22 6 6 6 3.47 1.13 3.47 4 6 7 2.71 0.43 2.71 4 6 4 Bottom Plate Design According to the API 650 clause 5.4.1, all bottom plates shall have a nominal minimum thickness of 6mm exclusive of any corrosion allowance. Minimum thickness as per API 650 Clause 5.4.1 /mm = 6 Corrosion allowance = 1.5 Required thickness /mm = 8 5 Annular Bottom Plate Dsign Minimum thickness as per API 650 (table 5-1a) /mm = 6 Corrosion allowance = 1.5 Required thickness /mm = 8 td/mm tt/mm Thickness for plate /mm

Lekhraj(API 650)

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