Calculate Collapse Strength of Casing

Input
Input casing outside diameter inches mm
Input casing wall thickness inches mm
Input yield strength

Mild Steel = 35000
Stainless Steel = 30000
HSLA Steel = 50000

Input ellipticity
frequently assumed as 0.01
Input Young's Modulus
typically = 3x107
Input Poisson's Ratio
typically = 0.3

 
Result
Theoretical collapse strength of a perfectly round casing   psi kg/cm2
Theoretical collapse with consideration for ellipticity   psi kg/cm2