Burst　capacity　assessment　at　a　corrosion　defect　of　pipe　elbows　subjected　to　internal　pressure　is　essential　for　oil/　gas　pipeline　integrity　management.　In　this　study,　a　three-dimensional　(3D)　nonlinear　finite　element　(FE)　model　validated　by　burst　tests　was　developed　to　investigate　the　effect　of　corrosion　defects　on　the　burst　capacity　of　X80　pipe　elbows.　Subsequently,　the　effects　of　corrosion　geometry　(i.e.　depth,　length,　and　width　of　the　defect)　on　the　pipe　burst　pressure　were　determined.　Based　on　the　Goodall　model　of　intact　pipe　elbows,　a　reasonable　mathe-matical　expression　for　the　failure　pressure　prediction　formula　for　corroded　pipelines　under　external　loads　was　derived　by　introducing　a　defect　geometry　factor　function.　Then,　combined　with　a　series　of　FE　cases,　a　new　prediction　model　of　burst　pressure　for　corroded　pipe　elbows　experiencing　internal　pressure　was　developed.　Finally,　the　accuracy　and　reliability　of　the　proposed　model　were　verified　using　extensive　parametric　FE　analysis.　The　results　show　that　the　average　error　of　failure　pressure　between　the　proposed　model　and　FEM　was　only　3.63%　for　291　cases.　Moreover,　the　prediction　accuracy　was　better　than　other　well-known　models.　Therefore,　the　proposed　model　can　be　widely　used　in　the　safety　assessment　of　corroded　elbows　of　oil/gas　pipelines.