30 Nov 2021

DESAIN DAN ANALISIS UPHEAVAL BUCKLING PADA PIPA BAWAH LAUT DI SELAT MAKASSAR
Design and Upheaval Buckling Analysis of Subsea Pipeline in Makassar Strait
M. Naufal Andika Setiawan1, Ricky Lukman Tawekal2, dan Jessica Rikanti Tawekal3
Program Studi Teknik Kelautan
Fakultas Teknik Sipil dan Lingkungan
Institut Teknologi Bandung
Jl. Ganesha 10, Bandung 40132
1andikanaufal99@gmail.com, 2ricky.tawekal@gmail.com, dan 3jessica.rikanti@gmail.com

Abstract: The most common method of transporting oil and gas to land is by subsea pipeline. The pipe that will be used needs to be designed to function properly. In general, the design and analysis process consist of wall thickness design according to DNVGL-ST-F101 standard, on-bottom stability analysis to determine the thickness of concrete coating according to DNV-RP-F109 standard, analysis of pipe installations with practical criteria or DNVGL-ST-F101 standard, and free span length according to DNV-RP-F105 standard. In addition, the buried pipe also needs additional analysis to determine the critical span length due to imperfection height to prevent upheaval buckling according to DNVGL-RP-F110 and DNVGL-RP-F114 standards. The design and analysis process were carried out for the subsea pipeline in Makassar Strait. The pipe wall thickness is 12.7 mm, and the concrete thickness is 40 mm. Then, the pipe installation was carried out with a Timas DL-01 barge with a trim angle of 1.5o and hitch of 0o. The allowed free span length is 10.762 m. Furthermore, the result of the on-bottom stability analysis also stated that the pipes at stations 1, 2, 3, 4, and 8 needed to be placed in a trench and buried. Then, the critical span length due to imperfection height is obtained, where the pipe has the potential to experience upheaval buckling, respectively at the five stations are 51,832 m, 53,467 m, 118,279 m, 127,07 m, and 44,13 m.

Keywords: subsea pipeline, pipe wall thickness, on-bottom stability, pipe installation, free span, imperfection height, upheaval buckling.