Fahriza, Muhammad Alief Dwi (2025) Analisis Risiko Dengan Metode Risk Based Inspection API 581 Yang Diintegrasi Dengan Entropy Weight Method (EWM) Pada Tube Dan Shell Unit MP Process Water Boiler. Other thesis, Institut Teknologi Sepuluh Nopember.
![[thumbnail of 5011211016-Undergraduate_Thesis.pdf]](http://repository.its.ac.id/style/images/fileicons/text.png) |
Text
5011211016-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (7MB) | Request a copy |
Abstract
Industri petrokimia pengolahan metanol menggunakan berbagai peralatan pendukung energi dalam proses yang sangat kompleks. Medium pressure process water boiler menghasilkan uap dengan memanaskan process water dalam shell dengan bantuan tube, sehingga air berubah menjadi uap yang dikumpulkan di steam drum sebelum digunakan dalam proses industri. Indeks risiko RBI API 581 yang bersifat umum perlu disesuaikan dengan kondisi konkret perusahaan dan pandangan engineer melalui metode entropy weight method (EWM) demi akurasi yang lebih tinggi apabila pembobotkan dilakukan dengan jumlah alternatif yang banyak. Mekanisme kerusakan pada boiler ada beberapa yaitu thinning, external corrosion, dan kemungkinan high temperature hydrogen attack (HTHA). Analisis pada probability of failure (PoF) dilakukan dengan mempertimbangkan 6 faktor yaitu remaining life factor (RLF), damage factor (DF), inspection factor (IF), current condition factor (CCF), process factor (PF), dan mechanical design factor (MDF). Sedangkan untuk consequence of failure (CoF) dilakukan dengan perhitungan kuantitatif dengan 2 konsekuensi yaitu area dan finansial. Perhitungan kuantitatif pada damage factor didapatkan nilai 0,0000030630294 (kategori 1) untuk bagian shell dan 0,153003094 (kategori 5) untuk bagian tube. Sementara untuk perhitungan konsekuensi area didapatkan 1.058,62 m2 apabila kecelakaan disebabkan bagian shell dan 71.919,15 m2 apabila kecelakaan disebabkan oleh bagian tube. Konsekuensi finansial untuk bagian shell didapat $582.723,5 dan untuk bagian tube $2.502.846. Metode integrasi dengan EWM didapatkan nilai PoF yaitu 0,285729105 (RLF), 0,182594464 (DF thinning), 0,091357759 (DF external corrosion), 0,000012542 (DF HTHA), 0,09693161 (IF), 0,096657648 (CCF), 0,149785261 (PF), dan 0,09693161 (MDF). Sementara untuk metode kustom EWM nilai konsekuensi area didapat 0,521507562 dan 0,478492438 untuk finansial. Perbandingan hasil metode kuantitatif dan metode integrasi menunjukkan kategori yang sama pada bagian shell tetapi sedikit berbeda dibagian tube. Pada perhitungan kuantitatif didapat PoF dengan skor 1 untuk shell dan skor 5 untuk tube, lalu untuk CoF didapat skor 4 untuk shell dan skor 5 untuk tube. Pada perhitungan dengan integrasi bobot didapat PoF dengan nilai 0,2729 untuk shell dan 2,7974 untuk tube, lalu untuk CoF didapat nilai 3,5215 untuk shell dan 4,5215 untuk tube. Adanya perbedaan risiko tube pada 2 metode tersebut karena pada metode perhitungan PoF kuantitatif hanya mempertimbangkan nilai damage factor yang dimana tube terdapat kemungkinan terjadinya HTHA sehingga kategori berada pada 5, sedangkan pada integrasi mempertimbangkan 6 faktor yang dimana nilai bobot damage factor totalnya hanya 0,273964765 dari skala 1. Untuk jadwal yang direkomendasikan untuk tube yaitu 2025 karena terdapat kemungkinan HTHA dan 2034 untuk shell.
===================================================================================================================================
The methanol-processing petrochemical industry utilizes a variety of energy-supporting equipment within a highly complex process. A medium-pressure process-water boiler generates steam by heating process water in a shell-and-tube setup, converting it into steam collected in a steam drum before being directed to industrial operations. The generic API 581 RBI risk index must be customized to reflect the company’s specific conditions and engineers’ perspectives through the entropy weight method (EWM) for greater accuracy, especially when many alternatives are being weighted. The damage mechanisms on the boiler include thinning, external corrosion, and the possibility of high temperature hydrogen attack (HTHA). The analysis of probability of failure (PoF) is carried out by considering six factors: remaining life factor (RLF), damage factor (DF), inspection factor (IF), current condition factor (CCF), process factor (PF), and mechanical design factor (MDF). Meanwhile, the consequence of failure (CoF) is calculated quantitatively by including two consequences: area and financial. Based on the quantitative calculation, the damage factor values obtained were 0.0000030630294 (category 1) for the shell and 0.153003094 (category 5) for the tube. For the area consequence, the results were 1,058.62 m² if an accident is caused by the shell and 71,919.15 m² if caused by the tube. The financial consequence values were $582,723.5 for the shell and $2,502,846 for the tube. Using the integrated method with EWM, the PoF values obtained were 0.285729105 (RLF), 0.182594464 (DF thinning), 0.091357759 (DF external corrosion), 0.000012542 (DF HTHA), 0.09693161 (IF), 0.096657648 (CCF), 0.149785261 (PF), and 0.09693161 (MDF). Meanwhile, the integrated EWM method produced consequence values of 0.521507562 for area and 0.478492438 for financial. A comparison of the quantitative method and the integrated method shows that both resulted in the same category for the shell part, but slightly different results for the tube. In the quantitative calculation, the PoF scores were 1 for the shell and 5 for the tube, while the CoF scores were 4 for the shell and 5 for the tube. In contrast, in the integrated weighting calculation, the PoF values were 0.2729 for the shell and 2.7974 for the tube, while the CoF values were 3.5215 for the shell and 4.5215 for the tube. The difference in risk results for the tube between the two methods arises because the quantitative PoF calculation only considers the damage factor, where the tube has the potential for HTHA, leading to a category of 5. On the other hand, the integrated method takes into account six factors, where the total weight of the damage factor is only 0.273964765 on a scale of 1. Based on these results, the recommended inspection schedule for the tube is in 2025 due to the possibility of HTHA, and 2034 for the shell.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Entropy Weight Method, MP Process Water Boiler, Risk Based Inspection. |
| Subjects: | T Technology > T Technology (General) > T174.5 Technology--Risk assessment. |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Muhammad Alief Dwi Fahriza |
| Date Deposited: | 31 Jul 2025 01:26 |
| Last Modified: | 31 Jul 2025 01:26 |
| URI: | http://repository.its.ac.id/id/eprint/124600 |
Actions (login required)
 |
View Item |