Download - Tank API650 Design
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Storage TankDesign
as per
IS 803 / API 650
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nDiameter: (D)= 6.0 m
nHeight:= 7.5 m
nDesign Liquid Height (H)= 7.5 m
nDesign Pressure : (h)=Hydrostatic+150 mm WC, and 50 mm WC (vacuum)nDesign Temperature=75 C
nOperating Pressure=Ambient, Hydrostatic
nOperating Temperature=4-50 C
nDesign Specific Gravity: (G)=0.85
nProduct Stored :Crude oil
nCorrosion Allowance: (CA)= 1.6 mm for Shell and Bottom, 0 mm for roof
nBasic wind speed : (Vb)= 47 m/sec (As per IS 875 Pt 3)
nSeismic loads :IS 1893 Zone III
nJoint efficiency:0.85
nTest Pressure:Full of waternMaterialShell, Bottom & Roof: IS 2062 Gr A
nYeild Strength: (fy)250 MPa (2549.3 Kgf/cm2 )
nTensile Strength: (T)410 MPa (4180.8 Kgf/cm2 )
nRoof slope:1:5
nShape Factor=0.7
DESIGN OF
CONE ROOF TANK, 200 m3
(Design and Construction Code: IS 803 / API 650 )
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Design Condition as Per IS 8
S1 = 0.7 (Yield Strength) = 0.7 x 250 M = 175 MPa
= 1784.5 Kgf/cm2
= 25381.6 psi
S2 = 0.4 (Tensile strength) = 0.4 x 410 M = 164 MPa
= 1672.3 Kgf/cm2= 23786.2 psi
Allowable Stress, S = Minimum of S1 or S2 = 164 MPa = 1672.3 Kgf/cm2
DESIGN OF SHELL PLATES (Reference: IS 803-CI 6.3.3)
Plate Thickness:
The minimum thickness of shell plates should not be less than calculated from following formula.
t= (4.9 (H-0.3) D.G / S. E) + CA
Where,
t= minimum thickness in mm;
D= nominal diameter of tank in m;
H= height from the bottom of the course under consideration to top of curb angle m;
G= specific gravity of liquid to be stored, but in no case less than 1;
S= allowable stress; and
E= joint efficiency factor.
1st Shell Course from bottom
t1 = (4.9 (H-0.3) D.G / S. E) + CA
= (4.9 (19.63-0.3) 20 x 0.85 / (164). (0.85)) + 1.6
= 2.89 mm
Provide 12 mm thick for 1510 mm height for bottom first shell course.2nd Shell Course from bottom
H = 19.63-1.51 = 18.12 m
t2 = (4.9 (H-0.3) D.G / S. E) + CA
= (4.9 (18.12-0.3) 20 x 0.85 / (164). (0.85)) + 1.6
= 2.62 mm
Provide 12 mm thick for 1510 mm height for bottom 2nd shell course.
3rd Shell course
H = 19.63-3.02 = 16.61 m
t3 = (4.9 (H-0.3) D.G / S. E) + CA
= (4.9 (16.61-0.3) 6 x 0.85 / (164). (0.85)) + 1.6= 2.35 mm
Provide 12 mm thick for 1510 mm height for 3rd shell course.
4th Shell course
H =19.63-4.53 =15.1 m
t4 = (4.9 (H-0.3) D.G / S. E) + CA
= (4.9 (3.0-0.3) 6 x 0.85 / (164). (0.85)) + 1.6
= 2.22 mm
Provide 10 mm thick for 1510 mm height for 4th shell course.
= 23786.2 psi
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5th Shell course
H = 19.63-6 = 1.5 m
t5 = (4.9 (H-0.3) D.G / S. E) + CA
= (4.9 (1.5-0.3) 6 x 0.85 / (164). (0.85)) + 1.6
= 1.82 mm
Provide 10 mm thick for 1510 mm height for 5th shell course.
6th Shell course
H = 19.63-6 = 1.5 m
t6 = (4.9 (H-0.3) D.G / S. E) + CA
= (4.9 (1.5-0.3) 6 x 0.85 / (164). (0.85)) + 1.6
= 1.82 mm
Provide 10 mm thick for 1510 mm height for 6th shell course.
7th Shell course
H = 19.63-6 = 1.5 m
t7 = (4.9 (H-0.3) D.G / S. E) + CA
= (4.9 (1.5-0.3) 6 x 0.85 / (164). (0.85)) + 1.6
= 1.82 mm
Provide 10 mm thick for 1510 mm height for 5th shell course.
8th Shell course
H = 19.63-6 = 1.5 m
t8 = (4.9 (H-0.3) D.G / S. E) + CA= (4.9 (1.5-0.3) 6 x 0.85 / (164). (0.85)) + 1.6
= 1.82 mm
Provide 8 mm thick for 1510 mm height for 8th shell course.
9th Shell course
H = 19.63-6 = 1.5 m
t9 = (4.9 (H-0.3) D.G / S. E) + CA
= (4.9 (1.5-0.3) 6 x 0.85 / (164). (0.85)) + 1.6
= 1.82 mm
Provide 8 mm thick for 1510 mm height for 9th shell course.
10th Shell course
H = 19.63-6 = 1.5 m
t1 = (4.9 (H-0.3) D.G / S. E) + CA
= (4.9 (1.5-0.3) 6 x 0.85 / (164). (0.85)) + 1.6
= 1.82 mm
Provide 8 mm thick for 1510 mm height for 10th shell course.
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11th Shell course
H = 19.63-6 = 1.5 m
t1 = (4.9 (H-0.3) D.G / S. E) + CA
= (4.9 (1.5-0.3) 6 x 0.85 / (164). (0.85)) + 1.6
= 1.82 mm
Provide 8 mm thick for 1510 mm height for 11th shell course.
12th Shell course
H = 19.63-6 = 1.5 m
t1 = (4.9 (H-0.3) D.G / S. E) + CA
= (4.9 (1.5-0.3) 6 x 0.85 / (164). (0.85)) + 1.6
= 1.82 mm
Provide 6 mm thick for 1510 mm height for 12th shell course.
13th Shell course
H = 19.63-6 = 1.5 m
t1 = (4.9 (H-0.3) D.G / S. E) + CA
= (4.9 (1.5-0.3) 6 x 0.85 / (164). (0.85)) + 1.6
= 1.82 mm
Provide 6 mm thick for 1510 mm height for 13th shell course.
As per Cl. 6.3.3.2 Shell thickness provided are above minimum nominal thickness recommended.
Bottom plate thickness:
Refer IS 803 Cl. 6.2 for bottom plate uniformly resting on foundation or ground.
Min. thickness = 6 mm + CA
= 6 mm + 1.6 mm
= 7.6 mm
Provide 8 mm thick bottom plate.
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No of shell
course from
bottom
Height of
course
Calculated
thickness
Thickness
required as
per design
Thickness
provided
(mm) (mm) (mm) (mm)
t13 1510 2.89 5 6
t12 1510 2.62 5 6
t11 1510 2.35 5 8
t10 1510 2.2 5 8
t9 1510 1.82 5 8
t8 1510 1.82 5 8
t7 1510 1.82 5 10t6 1510 1.82 5 10
t5 1510 1.82 5 10
t4 1510 1.82 5 10
t3 1510 1.82 5 12
t2 1510 1.82 5 12
t1 1510 1.82 5 12
Summary of Tank shell plates
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Shell Development and Weld Detail
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Bottom Plate Development
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Drawing Detail of CURB ANGLE
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Roof Development
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