초록 ▼

A method and apparatus for repairing a submerged pipeline. The method comprises installing a pair of hot tap tees on either side of the damaged section of pipeline, cutting a hole in the pipeline through each hot tap tee, inserting and securing plugging pigs into the pipeline, cutting and removing t

A method and apparatus for repairing a submerged pipeline. The method comprises installing a pair of hot tap tees on either side of the damaged section of pipeline, cutting a hole in the pipeline through each hot tap tee, inserting and securing plugging pigs into the pipeline, cutting and removing the damaged section of pipeline, and installing a new section of pipeline. The apparatus includes a plugging pig for use during repair of a damaged pipeline comprising a body shaft, a cup seal secured to the body shaft for engaging an interior wall of the pipeline, a cam attached to the exterior of the body shaft, a slip assembly for sliding on the cam and engaging a slip against the pipeline wall, and a control mechanism for engaging and releasing the slip from the wall.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method for replacing a damaged section of subsea pipeline setting on the seabed, the method comprising the steps of:installing a first and a second hot tap tee on a subsea pipeline such that each tee is positioned astride the pipeline with one hot tan tee on each side

[ What is claimed is:] [1.]1. A method for replacing a damaged section of subsea pipeline setting on the seabed, the method comprising the steps of:installing a first and a second hot tap tee on a subsea pipeline such that each tee is positioned astride the pipeline with one hot tan tee on each side of the damaged pipeline section;cutting a hole into the subsea pipeline through each hot tap tee;inserting a first plugging pig through the first hot tap tee and into the pipeline with a pig-set machine;inserting a second plugging pig through the second hot tap tee and into the pipeline;securing the plugging pigs within the pipeline;cutting the pipeline at a first location between the first plugging pig and the first hot tap tee with a cutting device to form a first pipe end;cutting the pipeline at a second location between the second plugging pig and the second hot tap tee with the cutting device to form a second pipe end;removing the damaged section of the subsea pipeline which includes the hot tap tees; andinstalling a new section of pipeline between the first and second pipeline ends.