Electronic Theses and Dissertation

Kebocoran pada pipa transportasi asam sulfat menjadi perhatian utama dalam industri, mengingat potensi risiko besar yang ditimbulkan terhadap keselamatan operasional dan lingkungan. Penurunan ketebalan dinding pipa akibat korosi asam sulfat dapat menyebabkan kegagalan struktural, seperti kebocoran atau le-dakan, yang mengancam keselamatan pekerja dan merusak infrastruktur. Penelitian ini bertujuan untuk mengevaluasi kelayakan operasional pipa yang mengalami penipisan multi-titik akibat korosi asam sulfat menggunakan pen-dekatan Fitness-for-Service (API 579-1/ASME FFS-1) Level 3 berbasis Finite Element Analysis. Data ketebalan pipa diperoleh melalui metode Critical Thick-ness Profile dengan menggunakan alat Ultrasonic Thickness Gauge, yang menghasilkan pemetaan ketebalan pada area terdegradasi. Simulasi numerik dilakukan dengan perangkat lunak ANSYS untuk menganalisis distribusi tegangan dan faktor keamanan pipa. Hasil penelitian menunjukkan bahwa meskipun pipa masih dapat beroperasi, estimasi sisa umur pipa yang terbatas menunjukkan potensi risiko kegagalan dalam waktu dekat. Berdasarkan analisis FFS Level 3, disarankan untuk melakukan pemeliharaan atau penggantian pipa pada area yang terdegradasi, guna memastikan keselamatan dan mencegah insiden lebih lanjut
Kata kunci: Fitness-for-service,Corrosion Remaining life assessment,Limit analysis, Finite element analysis, Sulfuric Acid Corrosion

Leaks in sulfuric acid transportation pipelines are a major concern in industry due to the significant risks they pose to operational safety and the environment. The reduction in pipe wall thickness caused by sulfuric acid corrosion can lead to structural failures, such as leaks or ruptures, which threaten worker safety and damage infrastructure. This study aims to evaluate the operational fitness of pipelines experiencing multi-point wall thinning due to sulfuric acid corrosion using the Fitness-for-Service (API 579-1/ASME FFS-1) Level 3 approach based on Finite Element Analysis. Pipe thickness data were obtained using the Critical Thickness Profile method with an Ultrasonic Thickness Gauge, producing detailed thickness mapping in degraded areas. Numerical simulations were conducted using ANSYS software to analyze stress distribution and safety factors of the pipeline. The results indicate that although the pipeline can still operate, the limited remaining service life suggests a potential risk of failure in the near future. Based on the Level 3 FFS analysis, maintenance or replacement of degraded sections is recommended to ensure safety and prevent further incidents. Keywords: Fitness-for-Service, Corrosion, Remaining Life Assessment, Limit Analysis, Finite Element Analysis, Sulfuric Acid Corrosion