Fmc Kongsberg Subsea As

Øystein Ellefsen

Hans-Paul Carlsen

Joao Pedro Castro Gonçalves

Graham Alan Ford

Ove Rørgård

Ronny Orekaasa

Joao Pedro Castro GONÇALVES

Stress reducing system and associated method for reducing stresses at a desired position in an offshore production or drilling system, the offshore production or drilling system comprising: a seabed structure, a floating structure and a riser () extending there between, the riser being tensioned, the riser () comprising at least a first part () and a second part (), which second part () is connected to the first part () via a flexible connection () allowing an axial, angular and/or rotational movement between the first and second parts (), said stress reducing system comprises:&#x2014;a first sensor () for real-time monitoring of stresses at the desired position, positioned at or close to the desired position (),&#x2014;an actuating system () arranged at the flexible connection (the actuating system () being connected to said first and second parts (), and wherein the actuating system () is configured to apply a force to the first or second part () when the first and second parts () are moved out of a neutral position,&#x2014;a control system () adapted to receive monitoring data from the first sensor (), wherein the control system () is connected to the actuating system () and is able of providing instruction signals to the actuating system (), wherein the control system (), based on said monitoring data from the first sensor (), is able to calculate a real-time set of data for control of the applied force of the actuating system () and instructing the actuating system () to act accordingly, such as to reduce the stress at said desired position.

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Kongsberg, Norway

Øystein Ellefsen