SENSITIVITY ANALYSIS ON PIPELINE WALL THICKNESS AND ON-BOTTOM STABILITY
Fredrik Nikolac 1 and Paramashati 2
Ocean Engineering
Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung
Jl. Ganesha 10 Bandung 40132
1 fredrik.nikolac@gmail.com and 2 parama@ocean.itb.ac.id
ABSTRACT. Oil and gas are the primary energy source to support human activities since the last century. Most of the exploration is done in the offshore. Pipeline is one of the best alternatives to transport the product from exploration in the offshore to the land. Pipeline is subjected to various environmental loads; therefore it has to be designed to withstand the entire loads. One of the aspects to be designed is pipe wall thickness and pipeline on bottom stability (concrete coating thickness). Pipe wall thickness and concrete coating thickness is affected by various parameters. Objectives of this study are to design the minimum wall thickness and concrete coating thickness, analyses how the parameters affect wall thickness and concrete coating thickness, and determine the most sensitive parameter for both aspects above. Case study in this paper is from PGN (Perusahaan Gas Negara) SSWJ (South Sumatra West Java) pipeline project. Wall thickness calculation and sensitivity analysis is done according to API RP 1111, while concrete coating thickness calculation and sensitivity analysis is done according to DNV RP E305. According to both codes, the minimum wall thickness is 14.94 mm and the minimum concrete coating thickness is 71 mm. From sensitivity analysis, wall thickness is directly proportional to diameter (Ds), pipe grade, and design pressure (Pd), while concrete coating thickness is directly proportional to pipe grade, significant wave heights (Hs), peak period (Tp), average velocity over pipe diameter (UD), and inversely proportional to water depth (d). The most sensitive parameter for wall thickness is pipe diameter (Ds), and the most sensitive parameter for concrete coating thickness is the average velocity over pipe diameter (UD).
Keywords: Sensitivity Analysis, Wall Thickness, On-Bottom Stability, Concrete Coating Thickness
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