Existing tie in systems for large diameter pipelines in deep water are often large in size and complicated, and require many time consuming operations. Furthermore, most of today's systems are limited to a maximum pipe diameter of 20''. Subject paper describes a new development of a simple, yet reliable, tie in system for large diameter pipelines in deep waters down to 2500 meters. The system is based on simple modularized tie in heads, one at each end of the pipeline spool, integrated with hydraulic control and communication packages. Primary communication and control is conducted from a PC on a vessel via acoustic modems to conduct pull in, alignment, and connection as well as seal testing and seal replacement if required. Secondary control can be done via a standard work class ROV should primary control & communication system fail. During operations the tie in spool is deployed from the support vessel with the tie in heads installed, one at each end. Upon reaching the tie in location subsea, pre installed guide posts on subsea terminations as well as guide funnels on the tie in heads will roughly align the pipe spool. Following rough alignment, the tie in head in each end will be operated from the vessel PC while ROV provide the camera for visual feedback to operator. Initial time savings analysis indicates that subject tie in system has a potential of cutting operations time down 50-70% as compared to existing systems on the market today. Further, due to the simplicity of the system, it is believed that tie in operations can be conducted far more safely than is the case today due to fewer lifting and other associated operations.
Autonomous subsea tie in system (AUSTIN) for lager diameter pipelines in deep waters
2001
8 Seiten, 2 Quellen
Aufsatz (Konferenz)
Englisch
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