The wear is nonuniform and actually removes a minimal

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Unformatted text preview: tic failure. Ys( A − B ) Pc = − C For P110, A=3.18,B=0.082, C=2855 D/t and Collapse(Worn) = 5951 psi Collapse(Unworn)= 7932 psi Difference = -25% Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 111 Tensile Strength Casing wear is concentrated at a contact point and is in the shape of a crescent in the pipe wall. The wear is nonuniform and actually removes a minimal amount of metal. The cross sectional area of the casing is only minimally reduced by even a high degree of wear. Fig.42 Temperature Effect on Yield Strength As temperature varies from 0 ℉ to the melting point of tubular steel(2700℉), the yield strength of the tubular is seen to be reduced to zero.This reduction is not exactly linear, nor is it the same for all steel alloys. The steel mills and numerous operations have researched this phenomena and found the strength reduction as a function of temperature to vary as shown in Fig.43. Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 112 Fig.43 (Should be Fig.50, Pg.54) 225 Vorenkamp Backup For Burs...
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