Design and Analysis of Lateral Buckling Potential Failure of Subsea Pipeline
Abednego Andries 1 dan Prof. Ricky Lukman Tawekal, Ph.D. 2
Program Studi Sarjana Teknik Kelautan
Fakultas Teknik Sipil dan Lingkungan, Institut Teknologi Bandung
Jalan Ganesha 10 Bandung 40312
auliabe@students.itb.ac.id 1 dan rickytawekal@ocean.itb.ac.id 2
Abstract
The progress of human civilization is closely related to the rapid development of technology in the field of oil and gas energy. The depletion of oil and gas sources has caused the exploration of fossil energy reserves to shift offshore so that they require a subsea pipeline structure. The pipe design process at the detailed engineering stage begins with the basic design of the steel pipe wall thickness. The design of the wall thickness pipeline is calculated based on the DNV-OS-F101 design standard. The pipe wall is designed to be resistant to failures due to excessive internal pressure, local buckling, and failure propagation due to buckling. The next stage is the pipeline analysis on-bottom stability which is calculated using the DNV-RP-E305 standard. If the weight of the steel pipe is not enough to keep the pipe still, then the use of concrete coating is needed to increase the weight of the pipe in order to reach the minimum weight of the pipe according to the analysis conducted. Analysis of the pipe installation is done using OFFPIPE software. This analysis aims to determine the configuration of the installation lay barge components in accordance with the provisions of the tensile strength of the thick pipe wall material so that it does not experience yield (yield). Then do the long free span pipe design that is allowed while on the seabed. The underwater pipeline that is held, is not fully leaning on the seabed because of the uneven bathymetry contours of the sea floor, causing the pipe to experience a free stretch due to uncontested. The wave load experienced by the undisputed pipe segment will result in harmonic movements in the pipe. The analysis is done so that the natural frequency due to harmonic motion of the pipe is smaller than the natural frequency of the pipe material. The next stage is the analysis of thermal end expansion that occurs in the pipeline. Pipes that are operating at high temperatures and temperatures cause the pipe structure material to increase in length. Analysis of the potential for lateral buckling failure using the Hobb method. is a calculation carried out to determine the potential for lateral buckling in the pipe structure. The design and analysis process that has been carried out results in a subsea pipeline design that has an outer diameter of 6,625 in steel, has a steel structure thickness of 0.28 in, a concrete coating thickness of 36 mm and a maximum allowable stretch of 25 m. The results of further analysis conducted stated that the pipe that has been designed does not have the potential to experience lateral buckling failure because the axial load is not large enough to trigger failure.
Keywords: subsea pipeline, wall thickness, on-bottom stability, installation analysis, free span, lateral buckling
Loading...
Reload document 
Open in new tab