Download - Moment of inertia API 650.xls.pdf
CALCULATION FOR MOMENT OF INERTIAL OF STIFFENER
1308
130 8
68
SHELLcorroded thkickness 6
200
section Area Y AY H H2 AH2 Igsection Area Y AY H H2 AH2 Ig1 1200 3 3600 65 4225 5070000 36002 1040 71 73840 3 9 9360 14646673 1040 140 145600 72 5184 5391360 5546.667
Total = 3280 223040 10470720 1473813
Neutral Axis = 68
Moment of Inertia, I = 11944533 mm4
Section modulus, Z = 157164.9 mm3 157.1649 cm3
Section modulus is from wind direction. So y value is 144 - 68 =
H
Liquid Hold Down Weight (wDesign Load (D
Wind Uplift Load
H
H/2 for Uniform
Internal Pressure LoadD/2
Wind Load on Shell
H
H/2 for Uniform
Internal Pressure LoadD/2
Wind Load on Shell H
Internal Pressure LoadD/2
Wind Load on Shell
H/2 for Uniform pressure on
Liquid Hold Down Weight (w
Design Load (D
H/2 for Uniform pressure on
Liquid Hold Down Weight (w
Design Load (D
H/2 for Uniform pressure on
Liquid Hold Down Weight (w
Design Load (D
Liquid Hold Down Weight (wL)Design Load (DL)
Wind Uplift Load
Moments about shell to bottom
joint
Internal Pressure Load
Wind Uplift Load
Moments about shell to bottom
joint
Internal Pressure Load
Wind Uplift Load
Moments about shell to bottom
Internal Pressure Load
Liquid Hold Down Weight (wL)
Design Load (DL)
Liquid Hold Down Weight (wL)
Design Load (DL)
shell to bottom joint
Liquid Hold Down Weight (w )
Design Load (DL)