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”  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.
- Ocean, Offshore and Arctic Engineering Division
Pipeline Subsea Repair
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Heier, E, & Mellem, T. "Pipeline Subsea Repair." Proceedings of the ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. Volume 3: Pipeline and Riser Technology; CFD and VIV. San Diego, California, USA. June 10–15, 2007. pp. 229-240. ASME. https://doi.org/10.1115/OMAE2007-29274
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