WebWhere: P cr = Theoretical collapse strength of a perfectly round tube. Where: P e = Collapse pressure with ellipticity (psi) E = Young’s Modulus for Steel (3×10 7) u = Poisson’s Ratio (0.3) D o = Outside diameter of casing (inches) t = Wall thickness (inches) S = Yield strength (mild steel = 35,000 psi) e = ellipticity, frequently assumed ... WebWhere: Y sp = Yield point of slotted pipe or shutter screen (lbs) Y p = Yield point of casing (lbs) from above. l = Slot length perpendicular to the axis of the pipe (inches) n = Number …

Calculators – Roscoe Moss

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