Remotely operated vehicles used for inspection and maintenance of subsea installations are guided using visual feedback from several vehicle mounted video cameras. These are augmented by position estimates from a navigation subsystem. A system is described which improves the quality of the video images by real-time video enhancement. The current generation of vehicles are limited in their opera...

The subsea jumper has become an essential part of production systems as a gas–liquid mixing pipeline connecting the end manifold (PLEM) to Christmas tree. During oil and gas transportation, common flow pattern, alternating characteristics slug easily cause vibration, resulting in instability or fatigue damage. present study investigates experimentally numerically M-shaped its induced vibrations...

subsea structures such as manifolds, line pipes and flow lines are important investments. also because of the sensitivity of environmental issues, corrosion of these structures is of vital importance. subsea corrosion management is different from on-shore and shallow water off-shore corrosion management in mainly three factors: materials, corrosion management practice and cathodic protection. t...

Present knowledge about the marine ecosystem on the Norwegian Continental Shelf towards the Arctic is sparse. These areas are vast, remote and subject to harsh weather conditions. We report from a three-year case study of an ongoing effort for real-time, subsea environmental monitoring by an oil and gas operator. The ‘facts’ about the subsea environment are anything but neutral; they are intrin...

One of the significant limitations in the long-haul undersea systems is the ability to deliver power to the optical amplifiers due to the power feeding from the shore ends thus capping the achievable optical power. The expected growth in undersea capacity requires new solutions for powering problem. The paper will examine approaches that include SDM to optimize the use of available optical powe...

Today’s undersea cable systems are increasingly complex and part of a much larger network topology that spans the continents. Operational efficiency can be significantly enhanced by integrating the undersea paths seamlessly into the overall network architecture. This implies that it is desirable to have one control plane for both the terrestrial and undersea parts of the network, one network ma...

Flexible and scalable networking solutions are required to offer more efficient bandwidth allocation and increased connectivity in submarine networks. In this regard, filterless optical networks based on agile edge nodes equipped with coherent transceivers and passive broadcast-and-select nodes are promising cost-effective options which allow for more flexible capacity allocation and resource o...

Deepwater operations in subsea production systems can be critically affected during transient events, such as shutdown periods, because of the formation of hydrates and/or wax deposits (see figure 1). Such formations/deposits can completely block production pipelines, thus requiring different technological solutions to restart production [1, 2]. In fact, during shutdown periods the fluid looses...