Dents　have　been　identified　as　among　the　most　common　deformation　defects　in　oil　and　gas　pipelines.　In　this　study,　the　multidimensional　mechanical　responses,　springback,　and　rerounding　behaviors　of　dents　as　well　as　the　interaction　of　multiple　dents　on　pipelines　and　their　effect　on　pipe　integrity　were　investigated　through　the　three-dimensional　finite　element　method　and　full-scale　burst　tests.　The　burst　test　demonstrates　that　a　plain　dent　has　a　minimal　effect　on　the　pipeline　burst　pressure,　and　the　burst　failure　position　is　not　located　in　the　dented　area.　Generally,　when　a　dented　pipeline　that　is　subjected　to　monotonically　increasing　internal　pressure　bursts,　the　dent　does　not　fully　reround,　and　a　convex　protuberance　forms　in　the　axial　shoulders　on　both　sides　of　the　dent.　During　pressurization,　the　maximum　equivalent　plastic　strain　in　the　dented　pipe　always　occurs　on　the　inner　surface　near　the　dent　center　in　which　no　necking　is　found　in　the　radial　direction　of　the　wall　thickness.　However,　a　larger　equivalent　stress　is　observed　around　the　edge　of　the　dent　center,　whereas　the　stress　at　the　center　is　relatively　small,　resulting　in　the　formation　of　a　plastic　hinge　in　the　dented　area.　If　internal　pressure　fluctuations　occur,　this　can　easily　lead　to　fatigue　failure.　Finally,　the　interaction　among　multiple　longitudinally　aligned　dents　was　investigated,　and　the　critical　spacing　affecting　the　integrity　of　the　pipeline　was　determined.　The　investigation　reveals　that　when　the　dent　spacing　exceeds　the　pipe　diameter,　the　interaction　between　two　dents　may　be　ignored,　and　the　dent　effect　on　the　pipe　integrity　may　be　separately　evaluated.　However,　if　the　dent　spacing　is　less　than　0.5　times　the　pipe　diameter,　then　the　dents　must　be　treated　as　a　combined　dent.　Further,　if　the　spacing　is　0.5-1.0　times　the　pipe　diameter,　then　dent　interaction　must　be　considered.