ARDIANGGAARDIANGGA, DZIKRI (2026) KALKULASI DAN ANALISIS SISA UMUR OPERASI PADA KOLOM DISTILASI DENGAN MENGGUNAKAN PENDEKATAN REMAINING LIFE ASSESSMENT(RLA). S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
Process equipment in the oil and gas industry, particularly distillation columns in Crude Distillation Units (CDUs), operates under high temperature and pressure conditions that can cause material degradation due to corrosion. This degradation is characterized by material thinning which reduces structural strength and increases the risk of equipment failure. This study aims to calculate and analyze the remaining operating life of distillation column C-201-01 using the Remaining Life Assessment (RLA) approach, as well as to analyze the causes of degradation rate variation among shells. Research data were obtained through Non-Destructive Testing methods including visual testing and Ultrasonic Thickness Testing (UTT), as well as laboratory analysis of acid rain composition and crude oil fractions at PT Kilang Pertamina Internasional Refinery Unit V. Analysis was conducted by calculating corrosion rates, determining minimum required thickness based on ASME BPVC Section VIII Division 1 provisions UG-27 and UG-28, and computing remaining life for each shell. Results indicate that the minimum required thickness is 8.84 mm based on UG-27 and 10.20 mm based on UG-28. Shell 1-01 is in the most critical condition with a corrosion rate of 0.258 mm/year and a governing remaining life of only 1.47 years, while Shells 1-02, 1-03, and 1-04 remain safe with remaining lives of 50.2, 22.8, and 35.1 years respectively. The corrosion rate pattern across shells is non-monotonic with respect to operating temperature, explained through three distinct corrosion mechanisms: wet electrochemical corrosion at Shell 1, a minimum corrosion transition zone at Shell 2, and naphthenic acid corrosion with intensity governed by sulfur content balance at Shells 3 and 4. Shell 1 experiences the highest degradation due to a combination of external factors including acid rain exposure and coastal chloride aerosols, and internal factors involving the most aggressive corrosion mechanisms in the overhead condensation zone. Keywords: Remaining Life Assessment (RLA), Distillation Column, Crude Distillation Unit (CDU), Corrosion Rate, Ultrasonic Thickness Testing (UTT) Peralatan proses pada industri minyak dan gas, khususnya distillation column pada unit Crude Distillation Unit (CDU), beroperasi dalam kondisi temperatur dan tekanan tinggi yang berpotensi menyebabkan degradasi material akibat korosi. Degradasi ini ditandai dengan penurunan ketebalan material yang dapat menurunkan kekuatan struktur serta meningkatkan risiko kegagalan peralatan. Penelitian ini bertujuan untuk menghitung dan menganalisis sisa umur operasi pada distillation column C-201-01 menggunakan pendekatan Remaining Life Assessment (RLA), serta menganalisis penyebab variasi laju degradasi antar shell. Data penelitian diperoleh melalui metode Non-Destructive Testing berupa visual testing dan Ultrasonic Thickness Testing (UTT), serta pengujian komposisi air hujan dan fraksi crude oil di laboratorium PT Kilang Pertamina Internasional Refinery Unit V. Analisis dilakukan dengan menghitung laju korosi, menentukan ketebalan minimum berdasarkan standar ASME BPVC Section VIII Division 1 ketentuan UG-27 dan UG-28, kemudian menghitung sisa umur operasi tiap shell. Hasil penelitian menunjukkan bahwa ketebalan minimum yang dipersyaratkan adalah 8,84 mm berdasarkan UG-27 dan 10,20 mm berdasarkan UG-28. Shell 1-01 berada dalam kondisi paling kritis dengan laju korosi 0,258 mm/tahun dan sisa umur operasi governing hanya 1,47 tahun, sedangkan Shell 1-02, 1-03, dan 1-04 masih dalam kondisi aman dengan sisa umur masing-masing 50,2 tahun, 22,8 tahun, dan 35,1 tahun. Pola laju korosi antar shell bersifat non-monotonis terhadap temperatur, yang dijelaskan melalui tiga kategori mekanisme korosi berbeda: korosi elektrokimia basah pada Shell 1, zona transisi minimum korosi pada Shell 2, serta korosi naphthenic acid dengan intensitas yang dikendalikan oleh keseimbangan kandungan sulfur pada Shell 3 dan 4. Shell 1 mengalami degradasi paling tinggi akibat kombinasi faktor eksternal berupa paparan hujan asam dan aerosol klorida pesisir, serta faktor internal berupa mekanisme korosi yang paling agresif di zona kondensasi overhead. Kata Kunci: Remaining Life Assessment (RLA), Kolom Distilasi, Crude Distillation Unit (CDU), Laju Korosi, Ultrasonic Thickness Testing (UTT)
| Item Type: | Thesis (S1) |
|---|---|
| NIM/NIDN Creators: | 41122010046 |
| Uncontrolled Keywords: | Remaining Life Assessment (RLA), Kolom Distilasi, Crude Distillation Unit (CDU), Laju Korosi, Ultrasonic Thickness Testing (UTT) |
| Subjects: | 500 Natural Science and Mathematics/Ilmu-ilmu Alam dan Matematika > 540 Chemistry/Kimia > 542 Procedures, Equipment of Chemistry/Prosedur, Perlengkapan dan Alat-alat Kimia > 542.3 Testing and Measuring/Alat Pengetesan dan Pengukuran 600 Technology/Teknologi > 620 Engineering and Applied Operations/Ilmu Teknik dan operasi Terapan > 621 Applied Physics/Fisika terapan > 621.8 Machine Engineering, Machinery/Teknik Mesin |
| Divisions: | Fakultas Teknik > Teknik Mesin |
| Depositing User: | khalimah |
| Date Deposited: | 12 Sep 2026 01:38 |
| Last Modified: | 12 Sep 2026 01:38 |
| URI: | http://repository.mercubuana.ac.id/id/eprint/103810 |
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