For reliability testing an Energy Expansion Tree (EET) and a companion Energy Function Model (EFM) are proposed and described in this paper. Different from conventional approaches, the EET provides a more comprehensive and objective way to systematically identify external energy factors affecting reliability. The EFM introduces energy loss into a traditional Function Model to identify internal ...

A new optical fibre feed-through for use in subsea in-well optical fibre sensing systems is reported. The new feed-through is compatible for use with standard subsea Christmas Tree penetrators and allows multiple re-mating of the feed-through over the lifetime of the device. The system has been extensively tested under in-well conditions and found to conform to the performance requirements. The...

This study investigates new methods to improve deepwater monitoring and addresses installation of advanced sensors on ”already deployed” risers, flowlines, trees, and other deepwater devices. A major shortcoming of post installed monitoring systems in subsea is poor coupling between the sensor and structure. This study provided methods to overcome this problem. Both field testing in subsea envi...

Riser emergency shutdown valves (RESDVs) are an essential risk reduction measure for offshore installations and are a legal requirement under the Pipelines Safety Regulations 1996. The RESDV should isolate the topsides from the well and subsea pipeline in the event of an emergency shutdown, to reduce the inventory for loss of containment or when required for maintenance. RESDV failures, whether...

To predict the sealing performance of subsea pipeline compression connector, a semi-analytical method is proposed and verified. The leakage condition obtained as function minimum radial deflection. consists three parts: macroscopic analytical model for interference process deduced based on membrane theory, mesoscopic two-dimensional finite element analysis internally turned surface according to...

To increase the oil production for the Tordis subsea oilfield located at the Norwegian Continental Shelf, a subsea separation and boosting station will be installed. Most of the water will be injected into a subsea reservoir instead of being transported up to the platform. Several challenges conserning process control need to be addressed before the implementation process, and dynamic simulatio...

Medium voltage XLPE cables are becoming a major component for subsea systems, especially for connection of inter-array cabling for offshore wind farms. Cables in subsea installations are subjected to significantly different conditions compared to corresponding underground systems. In particular the combined influence of salt water and hydrostatic pressure is important to study in the case of we...