Analysis of Inspection Scheduling on Free Spanning Subsea Pipeline Using Risk Based Inspection (RBI) Method

Daniel Mohammad Rosyid, Abizar Giffari, Yoyok Setyo Hadiwidodo


The subsea pipeline system of PT. X located at north of West Java transports natural gas with 19 kilometers long and 16 inches standard pipe size. The rough seabed causes free span problem. The system will be threatened by a structural failure of fatigue due to Vortex Induced Vibration (VIV) and local buckling as the effects of free span. In this Final Project, a total of 136 free spans on subsea pipeline system due to the uneven seabed are analyzed. The screening will be done for spans with length and diameter ratio more than 30 to figure out the free span which pass the screening and know the risk level of the subsea pipeline due to free span. The result for fatigue screening due to VIV, spans with a length more than 25 meters did not pass the screening. Local buckling occurred at the longest free span with a length of 62 meters. The level of risk to structural failure caused fatigue due to VIV has the highest level in terms of business and the environment, namely in the medium category. The level of risk to local buckling failures for safety, environmental, and business terms was in low category.


free span, Risk-Based Inspection, subsea pipeline, VIV, local buckling

Full Text:



Dey, Prasanta Kumar, dkk. “Risk Based Maintenance Model for Offshore Oil and Gas Pipelines: A Case Study”. Journal of Quality in Maintenance Engineering (2004): Vol. 10, number 4, Page 169-183.

Soegiono. Pipa Bawah Laut. Surbaya: Airlangga University Press (2007).

Bai, Young. Pipeline and Risers. USA: Elsevier (2001)

Yttervik, Rune dkk. “Fatigue from Vortex-Induced Vibration of Free Span pipelines Using Statistics of Current Speed and Direction”. Proceeding of 22nd Internation Conference on Offshore Mechanics and Artiic Engineering (2003). Cancun Mexico: 8-13 juni.

Rudiyanto, A., Rosyid, D., dan Hadiwidodo, Yoyok

“Analisa Risiko Pada Offshore Pipeline Milik PT. Trans Pacific Petrochemical Indotama (PT. TPPI) Tuban AKIBAT Free Span dengan Menggunakan Metode Risk Based Inspection. Jurnal Teknik Pomits (2014). Vol. 1, No.2.

DNV GL RP F105. Free spanning Pipeline. Recommended Practice (2017). Det Norske Veritas.

Bai, Qiang dan Young Bai. Subsea Pipeline Design, Analysis, and Installatiion.USA: Elseveir (2014)

Mouselli, A. H. Offshore Pipeline Design, Analysis, and Methods. Okhlama: PennWell Books (1981).

DNV OS F101. Submarine Pipeline System. Recommended Practice (2013). Det Norske Veritas

Rosyid, Daniel, M. Pengantar Rekayasa Keandalan. Surabaya: Airlangga University Press (2007)

Bai, Young, dan Qiang Bai. Subsea Pipeline Integrity and Risk Management. USA: Elseveir (2014).

Alamsyah, M. Furqon. Analisa Risk Based Inspection Pada PiPELINE 16” Jalur Sukowati – CPA yang Mengalami Upheaval Buckling. Tugas Akhir, Departemen Teknik Kelautan. Surabaya : Institut Teknologi Sepuluh Nopember (2013).

R. W. Lucky, “Automatic equalization for digital communication,” Bell Syst. Tech. J., Vol. 44, No. 4 (1965, Apr.) 547–588.

S. P. Bingulac, “On the compatibility of adaptive controllers (Published Conference Proceedings style),” in Proc. 4th Annu. Allerton Conf. Circuits and Systems Theory, New York (1994) 8–16.



  • There are currently no refbacks.


IJOCE Editor
Department of Ocean Engineering
Institut Teknologi Sepuluh Nopember (ITS)
Kampus ITS - Sukolilo
Surabaya 60111 - Indonesia
Phone/Fax: +62-31-592 8105


International Journal of Offshore and Coastal Engineering by Department of Ocean Engineering is licensed under a Creative Commons Attribution 4.0 International.

  Lisensi Creative Commons

Based on a work at