Hoisting method and assembly for abandoning and/or recovering an underwater pipeline from a laying vessel, and laying vessel equipped with such a hoisting assembly

摘要

A method of abandoning or recovering an underwater pipeline from a laying vessel includes the steps of looping a first rope about a pulley connected to the free end of the pipeline; end-locking the first rope, on one side, to the laying vessel; and winding or unwinding the first rope, on the other side, by means of a first winch located on the laying vessel.