Studi Komparasi Stabilitas Pipa Bawah Laut dengan DNVGL-RP-F109 dan Elemen Hingga

Nafisa Nandalianadhira; Mochammad Fathurridho Hermanto

doi:10.21107/rekayasa.v16i2.18804

Studi Komparasi Stabilitas Pipa Bawah Laut dengan DNVGL-RP-F109 dan Elemen Hingga

Nafisa Nandalianadhira, Mochammad Fathurridho Hermanto

Abstract

Deployment under the sea without being excavated or buried is the most effective alternative. The subsea pipeline must be ensured to be stable on the seabed, not experiencing movement when exposed to environmental forces. There are two main things that must be analyzed in the design process and stability analysis of subsea pipelines, hydrodynamic and hydrostatic forces. In the subsea pipeline design process, one of the most important steps is determining the wall thickness. One standard that is widely used is DNVGL-ST-F101. The diameter and thickness of the subsea pipeline are important parameters for determining subsea pipeline stability. The relationship between the forces acting to the subsea pipeline and the resistance of the soil (seabed) has been regulated in DNVGL-RP-F109. In addition, stability calculations can also be performed based on subsea pipeline modeling on the seabed using the finite element method. Based on these two methods, the vertical and lateral stability of the subsea pipeline can be determined. If the subsea pipeline is unstable, it is necessary to add concrete coating. Based on the pipe properties and environmental data, the wall thickness of the subsea pipeline is 18.203 mm. To be able to meet vertical and lateral stability for operating and installation conditions, 41 mm thick concrete coating is required. The greatest hydrodynamic force occurs in operating condition of 165.693 N/m based on DNVGL-RP-F109 and 154.150 N/m based on finite element. The difference of those result is only 6.96%.

Keywords

subsea pipeline, stability, modelling, finite element method

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References

API. (2007). Specification for Line Pipe (44th ed.).

Bai, Y., Tang, J., Xu, W., & Ruan, W. (2015). Reliability-based design of subsea light weight pipeline against lateral stability. Marine Structures, 43, 107–124. https://doi.org/10.1016/j.marstruc.2015.06.002

Bai, Y., & Yu, Z. (2011). Pipeline On-Bottom Stability Analysis Based on FEM Model. 5.

Choi, Han-Suk, Yu, Su-Young, Kang, Dae-Hoon, & 강효동. (2012). Parametric Study of Offshore Pipeline Wall Thickness by DNV-OS-F101, 2010. Journal of Ocean Engineering and Technology, 26(2), 1–7. https://doi.org/10.5574/KSOE.2012.26.2.001

DNVGL. (2017a). Recommended Practice F109 On-Bottom Stability Design of Submarine Pipelines.

DNVGL. (2017b). Recommended Practice F114 Pipe-Soil Interaction for Submarine Pipelines.

DNVGL. (2017c). Standard F101 Submarine Pipeline Systems.

Douglas Chukwu, O. (2016). Estimating On-Bottom Stability of Offshore Pipelines in Shallow Waters of the Gulf of Guinea. International Journal of Mechanical Engineering and Applications, 4(3), 115. https://doi.org/10.11648/j.ijmea.20160403.13

Draper, S., An, H., Cheng, L., White, D. J., & Griffiths, T. (2015). Stability of subsea pipelines during large storms. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 373(2033), 20140106. https://doi.org/10.1098/rsta.2014.0106

Griffiths, T., Draper, S., White, D., Cheng, L., An, H., & Fogliani, A. (2018). Improved Stability Design of Subsea Pipelines on Mobile Seabeds: Learnings From the STABLEpipe JIP. Volume 5: Pipelines, Risers, and Subsea Systems, V005T04A046. https://doi.org/10.1115/OMAE2018-77217

Hafez, K. A., Abdelsalam, M. A., & Abdelhameed, A. N. (2022). Dynamic on-bottom stability analysis of subsea pipelines using finite element model-based general offshore analysis software: A case study. Beni-Suef University Journal of Basic and Applied Sciences, 11(1), 36. https://doi.org/10.1186/s43088-022-00219-x

Ho, M., El-Borgi, S., Patil, D., & Song, G. (2020). Inspection and monitoring systems subsea pipelines: A review paper. Structural Health Monitoring, 19(2), 606–645. https://doi.org/10.1177/1475921719837718

Leckie, S. H. F., Draper, S., White, D. J., Cheng, L., Griffiths, T., & Fogliani, A. (2018). Observed changes to the stability of a subsea pipeline caused by seabed mobility. Ocean Engineering, 169, 159–176. https://doi.org/10.1016/j.oceaneng.2018.07.059

Leckie, S. H. F., Mohr, H., Draper, S., McLean, D. L., White, D. J., & Cheng, L. (2016). Sedimentation-induced burial of subsea pipelines: Observations from field data and laboratory experiments. Coastal Engineering, 114, 137–158. https://doi.org/10.1016/j.coastaleng.2016.04.017

Menteri ESDM RI. (2023). Keputusan Menteri Energi dan SUmber Daya Mineral Republik Indonesia tantan Rencana Induk Jaringan Transmisi dan Distribusi Gas Bumi Nasional Tahun 2022—2031.

Mousselli, A. H. (1981). Offshore Pipeline Design, Analysis, and Methods. PennWell Books. https://books.google.co.id/books?id=u7pTAAAAMAAJ

Peng, X.-L., & Hao, H. (2012). A Numerical Study Of Damage Detection Of Underwater Pipeline Using Vibration-Based Method. International Journal of Structural Stability and Dynamics, 12(03), 1250021. https://doi.org/10.1142/S0219455412500216

Ridlwan, A., Hidayatullah, M. S., & Kencana, E. R. (2022). On-Bottom Stability Analysis of Subsea Pipelines Based on DNVGL RP F109. Kapal: Jurnal Ilmu Pengetahuan Dan Teknologi Kelautan, 19(3), 165–176. https://doi.org/10.14710/kapal.v19i3.48398

Santoso, J. F., Tawekal, R. L., Arianta, & Ilman, E. C. (2023). Numerical Assessment Of Subsea Pipeline Pressure Capacity Due To External Circumferentialsemi-Ellipticalcrack. International Journal of GEOMATE, 25(108). https://doi.org/10.21660/2023.108.3734

Tanujaya, V. A., Tawekal, R. L., & Ilman, E. C. (2022). Vessel traffic geometric probability approaches with AIS data in active shipping lane for subsea pipeline quantitative risk assessment against third-party impact. Ocean Systems Engineering, 12(3), 267–284. https://doi.org/10.12989/OSE.2022.12.3.267

Tawekal, R. L., Allo, R. P. R., & Taufik, A. (2017). Damage Analysis of Subsea Pipeline Due to Anchor Drag. 12(15).

Tawekal, R. L., & Velas, J. D. (2019). Subsea Pipeline Protection Design Subjected To Dropped Anchor Using Concrete Mattress. International Journal of GEOMATE, 17(60). https://doi.org/10.21660/2019.60.84652

Tian, Y., Cassidy, M. J., & Chang, C. K. (2015). Assessment of offshore pipelines using dynamic lateral stability analysis. Applied Ocean Research, 50, 47–57. https://doi.org/10.1016/j.apor.2015.01.001

Youssef, B., & O’Brien, D. (2017). On-Bottom Stability Analysis of Submarine Pipelines, Umbilicals and Cables Using 3D Dynamic Modelling. Day 3 Wed, May 03, 2017, D031S035R001. https://doi.org/10.4043/27727-MS

Youssef, B. S., Cassidy, M. J., & Tian, Y. (2013). Application of Statistical Analysis Techniques to Pipeline On-Bottom Stability Analysis. Journal of Offshore Mechanics and Arctic Engineering, 135(3), 031701. https://doi.org/10.1115/1.4023204

Yu, S. Y., Choi, H. S., Lee, S. K., Do, C. H., & Kim, D. K. (2013). An optimum design of on-bottom stability of offshore pipelines on soft clay. International Journal of Naval Architecture and Ocean Engineering, 5(4), 598–613. https://doi.org/10.2478/IJNAOE-2013-0156