Evaluasi Kondisi Fitness-For-Service Tangki Timbun Menggunakan Metoda API 579-1/ASME-FFS Dan Uji Imersi ASTM G31

Sihombing, Mual (2024) Evaluasi Kondisi Fitness-For-Service Tangki Timbun Menggunakan Metoda API 579-1/ASME-FFS Dan Uji Imersi ASTM G31. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

This research aims to test the fit-for service (FFS) of aboveground storge tanks without adequate data that have been abandoned for 5 years due to an earthquake. The methods used are in-situ PMI OES, visual inspection and NDT (MT/PT, UT, MFL), immersion tests according to the ASTM_G31 standard and assessment using the API-579-1/ASME-FFS standard.
Visual inspection and NDT are carried out to test the physical access conditions of the tank. Immersion test experiment according to ASTM G31_72 method in a mixture of hydrocarbons (avtur, diesel fuel, kerosene and oil residue). Visual inspection, NDT and immersion testing are used to determine the rate of material corrosion as input for fitness-for-service calculations and simulations.
The immersion test experiment was carried out as by immersing test coupons of ASTM A-36 steel material, welded carbon steel A-36 and A-106 Gr.B for 5 and 8 days (120 hours/200 hours) with temperature variations of 30oC (ambient temperature conditions) 60o (operating conditions) and 90oC (re-rating conditions). Experimental results show that the corrosion rate of ASTM A-36 and A-106 Grade B carbon steel materials in aviation fuel, kerosene, diesel and residues is between 0.01-0.25 mm/year.
The assessment results according to API 579-1/ASME-FFS tank wall and roof plates are in a fit-for-service condition with an estimated remaining life of > 10 years. Meanwhile, the bottom plate of the T-107 tank and the steam distribution pipe made from A-106 Gr B steel do not meet the FFS Level 1 criteria and must be repaired/replaced.
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Penelitian ini bertujuan untuk menguji fit-for service (FFS) tangki yang telah ditinggalkan selama 5 tahun karena bencana alam tanpa ada data yang memadai. Metoda yang dilakukan adalah in-situ PMI, inspeksi visual dan NDT, uji imersi sesuai standard ASTM_G31 dan asesment menggunakan standard API-579-1/ASME-FFS.
Inspeksi visual dan NDT (MT/PT, UT dan MFL) dilakukan menguji mengakses kondisi fisik tangki. Percobaan uji imersi sesuai metoda ASTM G31_72 di dalam campuran hidrokarbon (avtur, solar diesel, kerosene dan residuum oil). Inspeksi visual, NDT dan uji imersi digunakan untuk menetukan laju korosi material sebagai input untuk perhitungan dan simulasi fitness-for-service.
Percobaan uji imersi dilakukan dengan mencelup tes kupon material baja ASTM A-36, baja karbon dilas dan dan A-106 Gr.B selama 5 dan 8 hari hari (120 jam/200 jam) dengan variasi temperatur 30o (kondisi suhu ambient) 60o (kondisi operasi) dan 90oC (kondisi re-rating). Hasil percobaan menunjukkan laju korosi material baja karbon ASTM A-36 dan A-106 Grade B di dalam avtur, kerosene, solar dan residuum berada antara nilai 0.01-0.025 mm/tahun.
Hasil asesment menurut kaidah API 579-1/ASME-FFS pelat dinding dan atap tangki berada dalam keadaan fit-for-service dengan estimasi remaining life > 10 tahun. Sementara pelat bottom tangki T-107 dan pipa penyalur uap yang terbuat dari baja A-106 Gr B tidak memenuhi kriterial FFS Level 1 dan harus diperbaiki/diganti.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Fitness-for-service, Corrosion Rate, Non-Destructive Examination, Hydrocarbon
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA462 Metal Corrosion and protection against corrosion
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 27101-(S2) Master Thesis
Depositing User:	Mual Sihombing
Date Deposited:	09 Feb 2024 08:28
Last Modified:	09 Feb 2024 08:31
URI:	http://repository.its.ac.id/id/eprint/106305

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