30 Nov 2021

DESAIN DAN ANALISIS POTENSI KEGAGALAN LATERAL BUCKLING PADA PIPA BAWAH LAUT DI LAUT JAWA
Design and Analysis of Potential Lateral Buckling Failure on Offshore Pipeline
in Java Sea
Miranda Savitri Andriani1, Ricky Lukman Tawekal2, dan Jessica Rikanti Tawekal3
Program Studi Teknik Kelautan
Fakultas Teknik Sipil dan Lingkungan
Institut Teknologi Bandung
Jl. Ganesha 10, Bandung 40132
1mirandasaxx@gmail.com, 2ricky.tawekal@gmail.com, dan 3jessica.rikanti@gmail.com

Abstract: Pipeline is a solution that is considered more efficient than tanker tanks in the transportation of any product if the transportation distance is relatively close. Pipelines at offshore locations experience many environmental loads in the form of currents and waves. The design process needs to be carried out under operating, hydrotest, and installation conditions with a pipe wall design configuration using the DNV-OS-F101 standard, design on the seabed using the DNV-RP-F109 standard, installation analysis based on DNVGL-ST-F101, and free span design using the DNV-RP-F105 standard. After that, the pipe laying configuration was designed based on the thermal expansion analysis using the ASME B31.8 Ch VIII standard. Then the analysis of the potential for lateral buckling failure was carried out using the Hobbs method. Based on the design process carried out in this Final Project, the wall thickness of the pipe that will be used is 12.7 mm (0.5 in), the required concrete layer thickness is 40 mm (1.5748 in). Then, the free span of the pipe is 18,75 m. In the thermal expansion analysis, it was found that the pipe will elongate by 3,9 mm during hydrotest conditions and by 0.11 m during operating conditions. The results of the further analysis carried out stated that the pipe that has been determined is unlikely to experience lateral buckling failure because the axial is not large enough to trigger failure.

Keywords: offshore pipeline, wall thickness, on-bottom stability, installation, free span, thermal end expansion, lateral buckling