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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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