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SEMI-SUBMERSIBLE GRAVITY BASED HYBRID STRUCTURE – AN ALTERNATIVE TO JACKET AND TOPSIDE PLATFORMS
Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.ORCID iD: 0000-0002-1224-792X
Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.ORCID iD: 0000-0002-0662-539X
ABB AB, Västeras, Sweden.
2014 (English)In: Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE, vol. 8B, 2014, 2014Conference paper, Published paper (Refereed)
Abstract [en]

The aim of this research is to present the result from a case study comparing a semi-submersible gravity based hybrid structure and a jacket topside structure for two offshore wind farm converter station projects. The cases are analyzed from a transportation and installation perspective. Converter stations enable the conversion from alternating to direct current, more efficiently bringing generated wind energy to shore. Out of the project process phases e.g. planning, engineering, fabrication, transport, installation and commissioning; transportation and installation are two of the most demanding during offshore platform projects. The weight and size of an offshore platform require specialized equipment, vessels and marine contractors’ expertise to be transported and installed. The risks associated with transportation and installation (T&I) operations are related to health, safety and environment, and T&I operations are also sensitive to any disturbance e.g. accidents and delays. Many interdependencies between disciplines in the project execution process may result in consequential and immediate impact, should an activity not follow the plan and thus the risk of cost overruns increases. In an attempt to circumvent risks related to heavy lifts offshore and consequently mitigate the corresponding risks, a new platform concept has been developed a Norwegian EPC –company and a Swiss converter station manufacturer, a semi-submersible gravity based hybrid, SSGBH. The subjects presented in this paper include the general principles of the SSGBH concept and in what way risk associated with T&I operations are reduced. This paper present the platform concepts, data gathered from interviews, archival data and direct observations. Their pros and cons are presented in an objective way, while concluding that platform concepts of this kind are and should be highly customized, as should the concept selection.

Place, publisher, year, edition, pages
2014.
National Category
Engineering and Technology Other Engineering and Technologies
Identifiers
URN: urn:nbn:se:mdh:diva-26795DOI: 10.1115/OMAE2014-23954ISI: 000363498600014Scopus ID: 2-s2.0-84911164008ISBN: 9780791845516 (print)OAI: oai:DiVA.org:mdh-26795DiVA: diva2:768411
Conference
ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2014; San Francisco; United States; 8 June 2014 through 13 June 2014
Projects
INNOFACTURE - innovative manufacturing development
Available from: 2014-12-03 Created: 2014-12-02 Last updated: 2015-11-19Bibliographically approved
In thesis
1. Considering Engineering Change Management in Project Realisation: The Case of Offshore Platform Projects
Open this publication in new window or tab >>Considering Engineering Change Management in Project Realisation: The Case of Offshore Platform Projects
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Offshore wind converter platforms are complex installations that increase the competitiveness of offshore wind as an energy source. Prior research in the field of offshore platform project execution has focused on early project phases and planning as means to increase project reliability. Later phases such as fabrication, transport and installation have not received the same attention from academia and industry. Projects of this type frequently suffer both large and small deviations. The further projects progress, the more deviations they accumulate. The accumulated deviations have to be resolved in a timely manner so as to avoid impairing the quality and scheduling of an overall project. This research explores the design of converter platforms and the management of engineering change in relation to fabrication, transport and installation in order to increase the overall reliability of projects.

Two offshore platform projects in three case studies form the source of empirical data. The first of the three studies considered prior research connected to fabrication and installation of offshore platforms. In the second study, the effect of two different platform designs on the fabrication and installation process was investigated. The third study considered engineering change management as a tool to achieve changeability, and examined its ability to buffer against deviations affecting later project phases i.e. fabrication, transport and installation. The findings revealed that the design’s effects on a project’s outcome are often not the driver of reliability. Rather, it was found that engineering change management is essential to any project to manage the changeable nature of projects. This research also raises concerns as to how much engineering change to allow for and in what project phase. That engineering change, as a tool, should preferably be used sparingly in early phases and as necessary in later phases. The observed engineering change process in the studied projects was chaotic.  This research suggests that engineering change can be organised around change carriers. In this way, it is predicted that the processes of change can become more stable and predictable. 

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2015
Series
Mälardalen University Press Licentiate Theses, ISSN 1651-9256 ; 212
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:mdh:diva-28057 (URN)978-91-7485-217-2 (ISBN)
Presentation
2015-08-20, Filen, Mälardalens högskola, Eskilstuna, 10:15 (English)
Opponent
Supervisors
Funder
Knowledge Foundation
Available from: 2015-06-03 Created: 2015-06-02 Last updated: 2015-07-09Bibliographically approved

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Citation style
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