Analisis Inspeksi Berbasis Risiko pada Tangki Amonia Menggunakan Pendekatan API 581 dan Validasi Umur Sisa dengan API 579

Huwaida, Haifa (2026) Analisis Inspeksi Berbasis Risiko pada Tangki Amonia Menggunakan Pendekatan API 581 dan Validasi Umur Sisa dengan API 579. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Amonia cair umumnya disimpan pada tangki penyimpanan berkapasitas besar dan beroperasi pada temperatur serta tekanan yang rendah. Mengingat sifat amonia yang korosif dan toksik, tangki perlu dipastikan keamanannya melalui proses inspeksi. Proses ini dilakukan pada tangki yang memiliki riwayat kegagalan maupun tidak. Karena jika tangki mengalami kebocoran dapat berdampak signifikan terhadap lingkungan. Proses inspeksi dapat menggunakan Risk Based Inspection (RBI) berdasarkan API 581. Untuk menambah penilaian pada tangki, dilakukan penialain kelayakan serta umur sisa dari tangki berdasarkan API 579. Proses diawali dengan mengidentifikasi jenis kemungkinan kerusakan yang dapat terjadi menggunakan API 571, kemudian dilakukan perhitungan probability of failure dan consequences of failure menggunakan API 581. Berdasarkan hasil analisis, mekanisme kerusakan yang dominan adalah thinning. Nilai probability of failure yang diperoleh sebesar 5,646E-4 untuk inner shell dan 2,200E-4 untuk bottom plate. Nilai consequence of failure pada bagian inner shell mencapai 25.216,337 untuk area-based dan USD18.860.531,66 untuk financial-based, sedangkan pada bottom plate nilai COF financial-based sebesar USD3.195.653,38. Hasil dari penialain kelayakan meyatakan bahwa baik inner shell mapupun bottom plate masih dikategorikan aman untuk dapat beroperasi dan umur sisa tangki masih cukup tinggi, yaitu 126,67 tahun untuk inner shell dan 45,65 tahun untuk bottom plate. Berdasarkan tingkat risiko keseluruhan yang berada pada kategori medium–high risk, perencanaan inspeksi dapat dilakukan kembali pada tahun 2029 dengan tingkat efektivitas inspeksi Usually Effective untuk inner shell dan Highly Effective untuk bottom plate.
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Liquid ammonia is commonly stored in large-capacity storage tanks and operated under low temperature and pressure conditions. Considering the corrosive and toxic nature of ammonia, the integrity and safety of the storage tank must be ensured through an inspection process. This inspection is required for tanks with or without a history of failure, as storage operations inherently carry the potential for damage that may lead to leakage and cause significant environmental impacts. Therefore, the inspection process can be conducted using the Risk-Based Inspection (RBI) methodology in accordance with API RP 581.To further assess the condition of the tank, a fitness-for-service evaluation and remaining life estimation are performed based on API 579. The assessment begins with the identification of potential damage mechanisms using API 571 as a reference, followed by the calculation of the probability of failure (POF) and consequence of failure (COF) in accordance with API RP 581. Based on the analysis results, the dominant damage mechanism identified is thinning. The calculated POF values are 5,646E-4 for the inner shell and 2,200E-4 for the bottom plate. The COF for the inner shell reaches 25,216.337 ft² for area-based consequences and USD18.860.531,66for financial-based consequences, while the financial-based COF for the bottom plate is USD3.195.653,38. The fitness-for-service evaluation indicates that both the inner shell and bottom plate are still classified as safe for continued operation. In addition, the remaining life of the tank components is relatively high, estimated at 126,67 years for the inner shell and 45,65 years for the bottom plate. Based on the overall risk level, which falls within the medium–high risk category, the next inspection is planned to be conducted in 2029, with inspection effectiveness levels classified as Usually Effective for the inner shell and Highly Effective for the bottom plate.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Amonia, Tangki Penyimpanan, Risk Based Inspection, Remaining Life Time, API 581, API 579 Ammonia, Storage Tank, Risk Based Inspection, Remaining Life Time, API 581, API 579
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:	Haifa Huwaida Huwaida
Date Deposited:	26 Jan 2026 10:33
Last Modified:	26 Jan 2026 10:33
URI:	http://repository.its.ac.id/id/eprint/130436

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