Possibilities and Implications by Designing an Aluminium Integrated Template Structure.
Steel has historically been the governing material for use in subsea applications. This master thesis looks into the possibility of using aluminium rather than steel in subsea structures. A four-slots integrated template structure installed on the Gjøa field in the Norwegian Sea is used as design ba...
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ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2454127 2023-05-15T17:47:07+02:00 Possibilities and Implications by Designing an Aluminium Integrated Template Structure. Lunde, Kjell Petter Løkling Nesheim, Henrik Westersjø Gjersvik, Tor Berge Johnsen, Roy 2017 http://hdl.handle.net/11250/2454127 eng eng NTNU ntnudaim:17267 http://hdl.handle.net/11250/2454127 Undervannsteknologi Undervannsteknologi - Drift og vedlikehold Master thesis 2017 ftntnutrondheimi 2019-09-17T06:52:42Z Steel has historically been the governing material for use in subsea applications. This master thesis looks into the possibility of using aluminium rather than steel in subsea structures. A four-slots integrated template structure installed on the Gjøa field in the Norwegian Sea is used as design basis. The use of aluminium represents a lighter structure with a potential in reducing life cycle cost. The aluminium alloys 5083 and 6082 are the only ones approved for structural seawater applications by the NORSOK M-121 standard, where H116 and T6 are the strongest approved tempers, respectively. However, material properties has to be fully understood in order to utilize aluminium in a subsea environment. Especially with respect to corrosion behaviour, mechanical properties and joining methods. Bolting, metal inert gas and friction stir welding are identified as preferred joining methods. The structure is redesigned utilizing appropriate alloys and joining methods. Load simulations are subsequently performed using finite element method, where the structure withstands design loads defined by industry standards with acceptable results. The main load types are drilling, trawling, tie-in and weight of equipment installed on the integrated template structure. The utilization of aluminium in subsea structures looks very promising for the integrated template structure, although there is a need for more research, especially with respect to corrosion of aluminium buried in soil. A total weight reduction of 36% is achieved by utilizing aluminium. Total cost for the aluminium made structure is competitive to steel, where aluminium fabrication cost is the decisive factor. Master Thesis Norwegian Sea NTNU Open Archive (Norwegian University of Science and Technology) Norwegian Sea |
institution |
Open Polar |
collection |
NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
topic |
Undervannsteknologi Undervannsteknologi - Drift og vedlikehold |
spellingShingle |
Undervannsteknologi Undervannsteknologi - Drift og vedlikehold Lunde, Kjell Petter Løkling Nesheim, Henrik Westersjø Possibilities and Implications by Designing an Aluminium Integrated Template Structure. |
topic_facet |
Undervannsteknologi Undervannsteknologi - Drift og vedlikehold |
description |
Steel has historically been the governing material for use in subsea applications. This master thesis looks into the possibility of using aluminium rather than steel in subsea structures. A four-slots integrated template structure installed on the Gjøa field in the Norwegian Sea is used as design basis. The use of aluminium represents a lighter structure with a potential in reducing life cycle cost. The aluminium alloys 5083 and 6082 are the only ones approved for structural seawater applications by the NORSOK M-121 standard, where H116 and T6 are the strongest approved tempers, respectively. However, material properties has to be fully understood in order to utilize aluminium in a subsea environment. Especially with respect to corrosion behaviour, mechanical properties and joining methods. Bolting, metal inert gas and friction stir welding are identified as preferred joining methods. The structure is redesigned utilizing appropriate alloys and joining methods. Load simulations are subsequently performed using finite element method, where the structure withstands design loads defined by industry standards with acceptable results. The main load types are drilling, trawling, tie-in and weight of equipment installed on the integrated template structure. The utilization of aluminium in subsea structures looks very promising for the integrated template structure, although there is a need for more research, especially with respect to corrosion of aluminium buried in soil. A total weight reduction of 36% is achieved by utilizing aluminium. Total cost for the aluminium made structure is competitive to steel, where aluminium fabrication cost is the decisive factor. |
author2 |
Gjersvik, Tor Berge Johnsen, Roy |
format |
Master Thesis |
author |
Lunde, Kjell Petter Løkling Nesheim, Henrik Westersjø |
author_facet |
Lunde, Kjell Petter Løkling Nesheim, Henrik Westersjø |
author_sort |
Lunde, Kjell Petter Løkling |
title |
Possibilities and Implications by Designing an Aluminium Integrated Template Structure. |
title_short |
Possibilities and Implications by Designing an Aluminium Integrated Template Structure. |
title_full |
Possibilities and Implications by Designing an Aluminium Integrated Template Structure. |
title_fullStr |
Possibilities and Implications by Designing an Aluminium Integrated Template Structure. |
title_full_unstemmed |
Possibilities and Implications by Designing an Aluminium Integrated Template Structure. |
title_sort |
possibilities and implications by designing an aluminium integrated template structure. |
publisher |
NTNU |
publishDate |
2017 |
url |
http://hdl.handle.net/11250/2454127 |
geographic |
Norwegian Sea |
geographic_facet |
Norwegian Sea |
genre |
Norwegian Sea |
genre_facet |
Norwegian Sea |
op_relation |
ntnudaim:17267 http://hdl.handle.net/11250/2454127 |
_version_ |
1766151432483897344 |