ORCAFLEX VIV HOW TO
The addition of RiserTec to the group will greatly enhance OSI’s subsea engineering capabilities while at the same time providing RiserTec with significantly increased commercial backing plus access to OSI’s large procurement network. and how to analyse for fatigue damage and vortex induced vibration (VIV). With leading-edge technologies and unsurpassed technical expertise, OSI can deliver reliable, cost-effective solutions to meet drilling, workover, production, lifting and mooring challenges & has a strong track record of supporting customer success for over 75 years. Against this background, RiserTec will continue to operate as a fully independent division within OSI providing riser, mooring and pipeline system engineering and analysis services to both existing and new Clients.
ORCAFLEX VIV FULL
OSI has the capability & expertise to enable customers to build and operate high-performance offshore facilities and offers a full range of solutions for the most demanding environments from project start to finish. RiserTec has recently been acquired by Oil States Industries, a major global provider of integrated energy systems and solutions. This gave the client the confidence to continue operating their system without the need for expensive remedial work.Sep-2019 RiserTec acquired by Oil States Industries We were able to provide a quick and accurate analysis of the system, due to a wealth of experience in the design and analysis of risers and other subsea structures, and analysis and modelling expertise. The VIV analysis also showed that the potential for VIV was not changed by the riser clearance, and so the original riser VIV assessment was still valid. The loads on the riser guides were also found to be within the design loads of the guides. The analysis showed that, whilst peak loads in the riser increased when compared with the nominal (as designed) case, the increase in loads did not represent a threat to the fitness for purpose of the riser, and did not significantly shorten the fatigue life of the riser.
The fatigue analysis was completed in accordance with DNV-RP-C203 using the OrcaFlex wave summing tool.Īn analysis of the effect of the clearance on the vortex induced vibration (VIV) of the system was also assessed, by comparing the magnitude of the clearance with the displacement predicted during VIV under local environmental conditions. The analysis included an extreme wave analysis, to investigate the integrity of the riser under storm wave conditions, and a wave induced fatigue analysis, in order to understand the effect of the riser movement on the fatigue life of the riser. This was capable of performing a dynamic and non-linear analysis of the problem, allowing for a time based analysis which accurately modelled the movement and impact of the riser.
We undertook an analysis of the riser using the OrcaFlex software. Offshore rigid spool lift analysis using FS2000 and rigging (round slings, shackles, master links, strops etc) design as per codes Installation Analysis of Subseaflexible, umbilical and power cables using OrcaFlex. Cathodic Protection design (DnVRP B401, DnV RP F103, PLUSONE). We were asked to investigate the potential impact of the oversized guides on the fitness for purpose of the riser. PiP OHTC calculation, Droppedobject assessment, VIV Analysis. The clearance between the riser and the guide allowed for a degree of riser movement within the guides under environmental loads. The internal diameter of the guide was 14 inches. The riser had an outer diameter of 10.75 inches. During a routine inspection of one of their risers, our client noticed that some of their riser guides were oversized, resulting in clearance between the riser and the inside of the guide.
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