Why Is The Outer Diameter Of Epoxy Resin Sleeves Usually Larger Than The Outer Diameter Of The Pipe?

The annulus between the epoxy bushing pipe and the main pipe provides space for compensation for deformation and stress release, reducing the direct constraints on the pipeline under the influence of foundation, temperature changes, or vibration. For pipeline systems containing corrosive media or in harsh external environments, the wider epoxy resin bushingouter diameter allows for easier later maintenance or replacement of the cladding and monitoring equipment, and facilitates the installation of evacuation or inspection interfaces. Domestic and international standards also indicate that the epoxy resin cast bushing inner diameter of pipelines crossing obstacles is typically approximately 100 mm or more larger than the outer diameter of the pipeline.