Analisis Optimalisasi Perlindungan Korosi Tangki T-005 Pertamina Ep Cepu Melalui Variasi Anoda Tumbal Pada Sistem 3 Layer Coating

Jatmiko, Hendry Dwi (2026) Analisis Optimalisasi Perlindungan Korosi Tangki T-005 Pertamina Ep Cepu Melalui Variasi Anoda Tumbal Pada Sistem 3 Layer Coating. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Korosi pada pelat dasar (bottom plate) tangki penyimpanan minyak mentah merupakan salah satu penyebab utama penurunan integritas struktur dan umur pakai tangki. Tangki T-005 Pertamina EP Cepu berpotensi mengalami korosi akibat interaksi antara baja karbon dengan lingkungan tanah yang agresif di bagian bawah tangki serta adanya water bottom pada sisi internal tangki. Penelitian ini bertujuan untuk mengidentifikasi karakteristik korosi pada pelat dasar tangki T-005, mengevaluasi efektivitas penggunaan anoda tumbal Magnesium (Mg), Aluminium (Al), dan Zinc (Zn) yang dikombinasikan dengan sistem 3 Layer Coating. Penelitian dilakukan secara eksperimental menggunakan metode weight loss pada spesimen baja ASTM A36 dengan variasi waktu perendaman selama 2, 4, dan 6 hari dalam media korosif, kemudian dilanjutkan dengan pengamatan makrostruktur menggunakan mikroskop optik perbesaran 50× untuk mengidentifikasi tingkat kerusakan permukaan dan pola serangan korosi. Hasil penelitian menunjukkan bahwa spesimen tanpa coating memiliki laju korosi tertinggi sebesar 3,780 mmpy pada hari ke-2 dan meningkat menjadi 14,847 mmpy pada hari ke-6 dengan karakteristik uniform corrosion. Penggunaan coating standar Pertamina mampu menurunkan laju korosi menjadi 1,989 mmpy pada hari ke-2 dan 5,518 mmpy pada hari ke-6. Kombinasi coating dengan anoda tumbal memberikan perlindungan yang lebih efektif, di mana Magnesium menghasilkan laju korosi terendah sebesar 0,012 mmpy, diikuti Aluminium sebesar 0,145 mmpy dan Zinc sebesar 0,321 mmpy. Dibandingkan penggunaan coating Pertamina saja, penambahan anoda Magnesium meningkatkan efisiensi proteksi sebesar 83,12%, Aluminium sebesar 74,03%, dan Zinc sebesar 57,14%. Hasil pengamatan makrostruktur juga menunjukkan bahwa spesimen yang diproteksi menggunakan anoda Magnesium memiliki tingkat kerusakan permukaan paling rendah. Berdasarkan hasil tersebut, sistem proteksi hibrida berupa kombinasi 3 Layer Coating dan anoda tumbal Magnesium dinilai paling efektif dalam melindungi pelat dasar tangki T-005, dengan kebutuhan arus proteksi sebesar 20,79 A sehingga mampu memperpanjang remaining service life tangki.
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Corrosion of the bottom plate in crude oil storage tanks is one of the primary factors contributing to the deterioration of structural integrity and the reduction of service life. The T-005 storage tank at Pertamina EP Cepu is susceptible to corrosion due to the interaction between carbon steel and the aggressive soil environment beneath the tank, as well as the presence of water bottom inside the tank. This study aims to identify the corrosion characteristics of the bottom plate of the T-005 storage tank and to evaluate the effectiveness of sacrificial anodes, namely Magnesium (Mg), Aluminum (Al), and Zinc (Zn), combined with a 3-Layer Coating system. The research was conducted experimentally using the weight loss method on ASTM A36 steel specimens with immersion periods of 2, 4, and 6 days in a corrosive medium. Macrostructural observations were subsequently performed using an optical microscope at 50× magnification to identify the extent of surface degradation and the corrosion attack patterns. The results indicate that the uncoated specimens exhibited the highest corrosion rate, reaching 3.780 mmpy on the second day and increasing to 14.847 mmpy on the sixth day, with a uniform corrosion pattern. The application of the standard Pertamina coating reduced the corrosion rate to 1.989 mmpy on the second day and 5.518 mmpy on the sixth day. A more effective corrosion protection performance was achieved by combining the coating with sacrificial anodes, where Magnesium produced the lowest corrosion rate of 0.012 mmpy, followed by Aluminum at 0.145 mmpy and Zinc at 0.321 mmpy. Compared with the use of the Pertamina coating alone, the addition of Magnesium, Aluminum, and Zinc sacrificial anodes improved the protection efficiency by 83.12%, 74.03%, and 57.14%, respectively. Macrostructural observations also confirmed that specimens protected with Magnesium exhibited the least surface damage. Based on these findings, the hybrid protection system consisting of a 3-Layer Coating combined with a Magnesium sacrificial anode was found to be the most effective method for protecting the bottom plate of the T-005 storage tank. The system requires a total protection current of 20.79 A and is capable of extending the remaining service life of the tank.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Laju Korosi, Anoda Tumbal, Metode Kehilangan Berat, Pelat dasar tangki penyimpanan, Pelapisan 3 Lapis, Corrosion rate, Sacrificial anode, Weight loss method, 3-Layer coating, Storage tank bottom plate.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives T Technology > TA Engineering (General). Civil engineering (General) > TA418.75 Corrosion-resistant materials
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Hendry Dwi Jatmiko
Date Deposited:	23 Jul 2026 06:17
Last Modified:	23 Jul 2026 06:17
URI:	http://repository.its.ac.id/id/eprint/136116

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