Unbonded flexible pipe for transporting an abrasive material, associated method and associated use

An unbonded flexible pipe for transporting an abrasive material, comprising:

• at least one tubular sheath delimiting a passage for circulation of the abrasive material;
• at least one armor layer of tensile armors positioned externally with respect to the tubular sheath, the al least one armor layer comprising a plurality of filiform armor elements,
• a protective internal layer positioned inside the at least one tubular sheath in the circulation passage, the protective internal layer including an elastomeric matrix and a longitudinal reinforcement assembly embedded in the matrix;
• wherein the protective internal layer is an innermost layer of the pipe, and wherein the protective internal layer is deformable and locally deforms when the abrasive material makes contact with the protective internal layer.