Corrosion allowance for metal pipes in petroleum refining and chemical enterprises
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Can pipelines in refining and petrochemical enterprises that have reached or are close to the corrosion allowance still be used?
Yes! But strength verification is required! First, calculate the design wall thickness using the film stress theory; the design wall thickness plus corrosion allowance plus rounding plus negative deviation equals the nominal wall thickness. In fact, due to the very small inner diameter of the pipes, their wall thickness is quite thin. Since standard pipes are selected based on their nominal wall thickness, the roundness values are usually quite high. Although there is no corrosion margin left, these roundness values are still more than sufficient to ensure the required strength