| 摘要 |
A flexible tubular pipe (1) of the unbonded type intended for transporting fluids in the field of offshore oil production, comprising at least, from the inside outward, a pressure sheath (3), an intermediate sheath (4), tensile armor layers (6, 7) and an external sheath (8), characterized in that the water permeance of said intermediate sheath (4) is at least two times smaller than the water permeance of said pressure sheath (3), and in that the hydrogen sulfide permeance of said intermediate sheath (4) is at least two times greater than the hydrogen sulfide permeance of said pressure sheath (3), and in that the carbon dioxide permeance of said intermediate sheath (4) is at least two times greater than the carbon dioxide permeance of said pressure sheath (3), and in that the methane permeance of said intermediate sheath (4) is at least two times greater than the methane permeance of said pressure sheath (3). |
