A rapid engineering predictive method for burst pressure of lined pipes

Lined pipes are increasingly used for hydrogen and corrosive fluids, but early burst-pressure assessment is limited by costly full-scale tests and lengthy finite element (FE) preprocessing. This study develops a closed-form analytical model for lined pipes based on thick-walled cylinder theory, interfacial displacement compatibility, and the maximum principal stress criterion. The result is a compact algebraic expression suitable for spreadsheet calculation within seconds. Verification against 12 FE cases gives a maximum relative error of 2.27% and an average of 1.08%. Thickness ratio dominates burst pressure but has opposite effects depending on which layer thickness is fixed; outer-pipe tensile strength correlates positively, whereas modulus ratio is negligible for the metallic materials studied. As an elastic engineering approximation for defect-free lined pipes under monotonic internal pressure, the model is intended for rapid preliminary screening, not for fatigue, fracture, or hydrogen-assisted integrity assessment.