Pipeline repairs at large water depths represent challenges for both for mechanical repair systems and for welding systems. This paper presents the main results from a Joint Industry Project (JIP) launched in late 2005 that was focused on the following main topics: • Revision of the Recommended Practice for “Mechanical pipeline couplings” [2] in order to include requirements for clamp repairs, hot-tapping and the pipeline’s response to isolation plug forces. • Methods to qualify remotely operated subsea hyperbaric welding in a dry habitat without performing NDT. At present such welding technology is being developed to join pipelines though the use of a sleeve and two fillet welds, and for the seal welds of hot-tapping pipeline branches.

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