Method and hoisting assembly for abandoning and/or recovering an underwater pipeline by means of a laying vessel and laying vessel equipped with such 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.