Response Analysis of Jacket Structure During Loadout Phase

Abstract

The purpose with this report is to verify that the Edvard Grieg jacket structure has sufficient strength to withstand the loads imposed during the load out operation at Kværner Verdal.The structural analysis has been performed using the SESAM program system, ref. [14], employing the programme modules GENIE and SESTRA.The jacket model used for load out is based on the model used for inplace analysis modified to fit the boundary conditions of the load out. A ?Weight not to be exceeded? (WNE) of 15 000 tonnes have been used, ref. [9].In the load out analysis the jacket model is supported on top of 800 mm long box members (pins) at each jacket launch runner leg main- and intermediate nodes in the launch runner area, i.e. 12 supports at each leg, ref. Figure 10.Differential settlements are applied as prescribed displacements at bottom of support pin members to reflect requirements given in chapter 5.2.3 of document LUN-KVE-FD-0131 ?Design brief ? Temporary Phases?, ref. [7]. Description of differential settlements applied is given in chapter 5.1.4.2.2.The code checks of the jacket are performed according to NORSOK standards, ref. [1, 2 and 3], using SESAM module GENIE. The Saipem barge S600 will be used during load out and sea transportation. The barge will be safely moored and free floating with stern against quay front during load out.