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...

A redundant Field Programmable Gate Array (FPGA) based controller for subsea Blowout Preventer (BOP) is presented. Triple modular redundancy technique is used for architecture design, since high reliability is a necessary requirement for subsea BOP control system. A multiprocessor system is developed to enhance reliability of the processors and performance of the system. In addition, the shared...

Subsea systems used in combination with host facilities, such as floating, production storage and offloading units (FPSOs), tension leg platforms (TLPs), spars or compliant towers employ supervisory control and data acquisition (SCADA) systems whose architectures differ from SCADA systems found on conventional platforms. In these systems, programmable logic controllers (PLCs) located on the hos...

Double-curved pipes are widely employed as essential components of subsea pipeline systems. Considering the layout flexibility and application diversity, there various spatial structures for double-curved combinations. However, few studies have compared flow characteristics in different pipes. The dissipations corresponding downstream not been thoroughly investigated, which crucial measurement ...