An inner detecting device for subsea oil and gas pipeline

摘要

An inner detecting device for subsea oil and gas pipeline includes a support shaft (2) defining a sealed chamber therein; a packer cup coupled to the support shaft; a hinge assembly (3) coupled to the support shaft (2), swinging with respect to the support shaft (2) in a radial direction and sliding with respect to the support shaft (2) in an axial direction; a magnetic detector (5) connected to the hinge assembly (3) to move with respect to the support shaft (2) in the radial and axial directions, and the magnetic detector (5) tending to move away from the support shaft (2) in the radial direction; a battery pack (7); an electric recorder (8) electrically connected to the battery pack (7); and a mileage recorder (10) recording a travel distance of the inner detecting device within the pipeline.