Why Was CRA Clad/Lined Steel Pipe needed?
For onshore and offshore pipelines that need to achieve a balance between the mechanical properties of the C-Mn tube steel and the corrosion resistance properties of a Corrosion Resistant Alloy (CRA) Tenaris provides clad and lined pipes.
Production fluids often contain a high sulfur or CO2 content that requires the use of materials suitable for corrosive environments. When the H2S and CO2 content are too high for the corrosion resistance properties of C-Mn steel, a CRA is often employed.
Both clad or lined pipes consist of a C-Mn pipe which has a layer of CRA in contact with the production fluid and hence, its corrosive environment. In the case of clad pipes, the layer of CRA is applied using different procedures that create a metallurgical bond, while in the case of lined pipe an internal CRA pipe is connected to the external C-Mn pipe through mechanical bond.