DESIGN AND BURSTING ANALYSIS DUE TO MECHANO-CORROSION OF SUBSEA PIPELINE IN JAVA SEA

• Main Author: Aldin Wijanto, Diya
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/86785
• Institution: Institut Teknologi Bandung

The phenomenon of corrosion, influenced by environmental and mechanical factors, poses a major challenge in maintaining pipeline integrity throughout its service life. Therefore, a realistic corrosion prediction model is essential to support the mitigation of losses caused by corrosion. A 12 ¾-inch subsea pipeline was designed with a wall thickness of 12.7 mm and coated with 3LPP without a concrete layer. Nonlinear Finite Element (FE) analysis was conducted, incorporating mechano-corrosion analysis with stress interaction based on an empirical corrosion model. The bursting capacity and corrosion topography were evaluated annually over a 20-year service life. A parametric study on operational pressure variation was performed to assess the impact of increased pressure on bursting capacity. The modeling results indicated that operational pressure significantly affects the accelerated degradation of the pipe wall thickness and the reduction of bursting pressure. In the uniform corrosion model, the bursting pressure decreased from 26.92 to 29.65 MPa, with an average annual reduction of 1.49%-1.95%. Meanwhile, the random corrosion model showed a decrease from 26.43 to 27.87 MPa, with an average annual reduction of 1.78%-2.04%. The mechano-corrosion model under extreme operational pressure resulted in a reduction of bursting pressure by up to 50% of the initial design value in the 20th year, with an average annual decrease of 3.91%-4.75%.