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PC = 2 Sy [ ((D/t)-1) / (D/t)2 ]

The equation above is unclear: What stands for S, y, D, t?

The one I am using:

PC= 2*E/ (1-M^2)*(t/D)^3

Where E= Elasticity [Young] modulus, M= Poisson ratio, t= wall thickness, D= external pipe diameter

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