On the Fatigue of Steel Catenary Risers

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CHIBUEZE, Nnamdi Onochie;OSSIA, Chinwuba Victor;OKOLI, John Umunna.
On the Fatigue of Steel Catenary Risers. 
Strojniški vestnik - Journal of Mechanical Engineering, [S.l.], v. 62, n.12, p. 751-756, june 2018. 
ISSN 0039-2480.
Available at: <https://www.sv-jme.eu/article/on-the-fatigue-of-steel-catenary-risers/>. Date accessed: 11 may. 2021. 
doi:http://dx.doi.org/10.5545/sv-jme.2015.3060.
Chibueze, N., Ossia, C., & Okoli, J.
(2016).
On the Fatigue of Steel Catenary Risers.
Strojniški vestnik - Journal of Mechanical Engineering, 62(12), 751-756.
doi:http://dx.doi.org/10.5545/sv-jme.2015.3060
@article{sv-jmesv-jme.2015.3060,
	author = {Nnamdi Onochie Chibueze and Chinwuba Victor Ossia and John Umunna Okoli},
	title = {On the Fatigue of Steel Catenary Risers},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {62},
	number = {12},
	year = {2016},
	keywords = {steel catenary risers; touchdown point; Ochi-Hubble; JONSWAP},
	abstract = {Steel catenary risers (SCR), though an appropriate and cost effective tool for deepwater development, are fraught with difficult fatigue challenges derived from loads due to the actions of wind, wave and current. In this study, a model SCR-AB with end-A attached to floating production, storage and offloading vessels (FPSO) and end-B anchored to the seabed was created using OrcaFlex© finite element software. Also attached to this model is a 104 kg 6D buoy of 6 m height and volume 20 m³, which was fixed to the SCR at 900 m of the riser length. The various sections of the homogenous 2200 m long SCR pipe include 50 m flex joint section, 350 m strake length, 1300 m riser pipe length, and 500 m flowline section. Metrological ocean data, geotechnical data and SCR data were input into the model which was subjected to the Ochi-Hubble and Joint North Sea Wave Project (JONSWAP) wave spectra. Analyses to determine the influence of fatigue damage on the model was made using system simulation under both static and dynamic modes. The results for JONSWAP wave spectra showed the fatigue life of the SCR to be 1.8 years at the touch-down-point (TDP) while that of Ochi-Hubble wave spectra showed a fatigue life of 13.6 years at SCR TDP, differing by a factor of 7.5. Furthermore, the S-N curves obtained from both wave spectra corroborated an inverse relationship between Stress values S and the number of stress cycles to failure N on a log-log scale.},
	issn = {0039-2480},	pages = {751-756},	doi = {10.5545/sv-jme.2015.3060},
	url = {https://www.sv-jme.eu/article/on-the-fatigue-of-steel-catenary-risers/}
}
Chibueze, N.,Ossia, C.,Okoli, J.
2016 June 62. On the Fatigue of Steel Catenary Risers. Strojniški vestnik - Journal of Mechanical Engineering. [Online] 62:12
%A Chibueze, Nnamdi Onochie
%A Ossia, Chinwuba Victor
%A Okoli, John Umunna
%D 2016
%T On the Fatigue of Steel Catenary Risers
%B 2016
%9 steel catenary risers; touchdown point; Ochi-Hubble; JONSWAP
%! On the Fatigue of Steel Catenary Risers
%K steel catenary risers; touchdown point; Ochi-Hubble; JONSWAP
%X Steel catenary risers (SCR), though an appropriate and cost effective tool for deepwater development, are fraught with difficult fatigue challenges derived from loads due to the actions of wind, wave and current. In this study, a model SCR-AB with end-A attached to floating production, storage and offloading vessels (FPSO) and end-B anchored to the seabed was created using OrcaFlex© finite element software. Also attached to this model is a 104 kg 6D buoy of 6 m height and volume 20 m³, which was fixed to the SCR at 900 m of the riser length. The various sections of the homogenous 2200 m long SCR pipe include 50 m flex joint section, 350 m strake length, 1300 m riser pipe length, and 500 m flowline section. Metrological ocean data, geotechnical data and SCR data were input into the model which was subjected to the Ochi-Hubble and Joint North Sea Wave Project (JONSWAP) wave spectra. Analyses to determine the influence of fatigue damage on the model was made using system simulation under both static and dynamic modes. The results for JONSWAP wave spectra showed the fatigue life of the SCR to be 1.8 years at the touch-down-point (TDP) while that of Ochi-Hubble wave spectra showed a fatigue life of 13.6 years at SCR TDP, differing by a factor of 7.5. Furthermore, the S-N curves obtained from both wave spectra corroborated an inverse relationship between Stress values S and the number of stress cycles to failure N on a log-log scale.
%U https://www.sv-jme.eu/article/on-the-fatigue-of-steel-catenary-risers/
%0 Journal Article
%R 10.5545/sv-jme.2015.3060
%& 751
%P 6
%J Strojniški vestnik - Journal of Mechanical Engineering
%V 62
%N 12
%@ 0039-2480
%8 2018-06-27
%7 2018-06-27
Chibueze, Nnamdi, Chinwuba Victor Ossia, & John Umunna Okoli.
"On the Fatigue of Steel Catenary Risers." Strojniški vestnik - Journal of Mechanical Engineering [Online], 62.12 (2016): 751-756. Web.  11 May. 2021
TY  - JOUR
AU  - Chibueze, Nnamdi Onochie
AU  - Ossia, Chinwuba Victor
AU  - Okoli, John Umunna
PY  - 2016
TI  - On the Fatigue of Steel Catenary Risers
JF  - Strojniški vestnik - Journal of Mechanical Engineering
DO  - 10.5545/sv-jme.2015.3060
KW  - steel catenary risers; touchdown point; Ochi-Hubble; JONSWAP
N2  - Steel catenary risers (SCR), though an appropriate and cost effective tool for deepwater development, are fraught with difficult fatigue challenges derived from loads due to the actions of wind, wave and current. In this study, a model SCR-AB with end-A attached to floating production, storage and offloading vessels (FPSO) and end-B anchored to the seabed was created using OrcaFlex© finite element software. Also attached to this model is a 104 kg 6D buoy of 6 m height and volume 20 m³, which was fixed to the SCR at 900 m of the riser length. The various sections of the homogenous 2200 m long SCR pipe include 50 m flex joint section, 350 m strake length, 1300 m riser pipe length, and 500 m flowline section. Metrological ocean data, geotechnical data and SCR data were input into the model which was subjected to the Ochi-Hubble and Joint North Sea Wave Project (JONSWAP) wave spectra. Analyses to determine the influence of fatigue damage on the model was made using system simulation under both static and dynamic modes. The results for JONSWAP wave spectra showed the fatigue life of the SCR to be 1.8 years at the touch-down-point (TDP) while that of Ochi-Hubble wave spectra showed a fatigue life of 13.6 years at SCR TDP, differing by a factor of 7.5. Furthermore, the S-N curves obtained from both wave spectra corroborated an inverse relationship between Stress values S and the number of stress cycles to failure N on a log-log scale.
UR  - https://www.sv-jme.eu/article/on-the-fatigue-of-steel-catenary-risers/
@article{{sv-jme}{sv-jme.2015.3060},
	author = {Chibueze, N., Ossia, C., Okoli, J.},
	title = {On the Fatigue of Steel Catenary Risers},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {62},
	number = {12},
	year = {2016},
	doi = {10.5545/sv-jme.2015.3060},
	url = {https://www.sv-jme.eu/article/on-the-fatigue-of-steel-catenary-risers/}
}
TY  - JOUR
AU  - Chibueze, Nnamdi Onochie
AU  - Ossia, Chinwuba Victor
AU  - Okoli, John Umunna
PY  - 2018/06/27
TI  - On the Fatigue of Steel Catenary Risers
JF  - Strojniški vestnik - Journal of Mechanical Engineering; Vol 62, No 12 (2016): Strojniški vestnik - Journal of Mechanical Engineering
DO  - 10.5545/sv-jme.2015.3060
KW  - steel catenary risers, touchdown point, Ochi-Hubble, JONSWAP
N2  - Steel catenary risers (SCR), though an appropriate and cost effective tool for deepwater development, are fraught with difficult fatigue challenges derived from loads due to the actions of wind, wave and current. In this study, a model SCR-AB with end-A attached to floating production, storage and offloading vessels (FPSO) and end-B anchored to the seabed was created using OrcaFlex© finite element software. Also attached to this model is a 104 kg 6D buoy of 6 m height and volume 20 m³, which was fixed to the SCR at 900 m of the riser length. The various sections of the homogenous 2200 m long SCR pipe include 50 m flex joint section, 350 m strake length, 1300 m riser pipe length, and 500 m flowline section. Metrological ocean data, geotechnical data and SCR data were input into the model which was subjected to the Ochi-Hubble and Joint North Sea Wave Project (JONSWAP) wave spectra. Analyses to determine the influence of fatigue damage on the model was made using system simulation under both static and dynamic modes. The results for JONSWAP wave spectra showed the fatigue life of the SCR to be 1.8 years at the touch-down-point (TDP) while that of Ochi-Hubble wave spectra showed a fatigue life of 13.6 years at SCR TDP, differing by a factor of 7.5. Furthermore, the S-N curves obtained from both wave spectra corroborated an inverse relationship between Stress values S and the number of stress cycles to failure N on a log-log scale.
UR  - https://www.sv-jme.eu/article/on-the-fatigue-of-steel-catenary-risers/
Chibueze, Nnamdi, Ossia, Chinwuba, AND Okoli, John.
"On the Fatigue of Steel Catenary Risers" Strojniški vestnik - Journal of Mechanical Engineering [Online], Volume 62 Number 12 (27 June 2018)

Authors

Affiliations

  • University of Port Harcourt, Offshore Technology Institute, Nigeria 1

Paper's information

Strojniški vestnik - Journal of Mechanical Engineering 62(2016)12, 751-756

https://doi.org/10.5545/sv-jme.2015.3060

Steel catenary risers (SCR), though an appropriate and cost effective tool for deepwater development, are fraught with difficult fatigue challenges derived from loads due to the actions of wind, wave and current. In this study, a model SCR-AB with end-A attached to floating production, storage and offloading vessels (FPSO) and end-B anchored to the seabed was created using OrcaFlex© finite element software. Also attached to this model is a 104 kg 6D buoy of 6 m height and volume 20 m³, which was fixed to the SCR at 900 m of the riser length. The various sections of the homogenous 2200 m long SCR pipe include 50 m flex joint section, 350 m strake length, 1300 m riser pipe length, and 500 m flowline section. Metrological ocean data, geotechnical data and SCR data were input into the model which was subjected to the Ochi-Hubble and Joint North Sea Wave Project (JONSWAP) wave spectra. Analyses to determine the influence of fatigue damage on the model was made using system simulation under both static and dynamic modes. The results for JONSWAP wave spectra showed the fatigue life of the SCR to be 1.8 years at the touch-down-point (TDP) while that of Ochi-Hubble wave spectra showed a fatigue life of 13.6 years at SCR TDP, differing by a factor of 7.5. Furthermore, the S-N curves obtained from both wave spectra corroborated an inverse relationship between Stress values S and the number of stress cycles to failure N on a log-log scale.

steel catenary risers; touchdown point; Ochi-Hubble; JONSWAP