OPTIMASI DESAIN DAN SIMULASI SISTEM PROTEKSI KATODIK ANODA KORBAN PADA WATER INJECTION PIPELINE PERTAMINA-PETROCHINA EAST JAVA TUBAN PLANT

ERLINDA, MUSTIKA DWI (2017) OPTIMASI DESAIN DAN SIMULASI SISTEM PROTEKSI KATODIK ANODA KORBAN PADA WATER INJECTION PIPELINE PERTAMINA-PETROCHINA EAST JAVA TUBAN PLANT. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sistem proteksi katodik anoda korban adalah salah satu metode pengendalian korosi dengan menghubungkan struktur yang diproteksi dengan logam lain yang lebih aktif, sehingga struktur menjadi terproteksi sedangkan logam lain terkorosi. Sistem tersebut diterapkan pada saluran Water Injection Pipeline milik Pertamina-Petrochina East Java Tuban Plant. Saluran Water Injection Pipeline yang dianalisis pada penelitian ini memiliki panjang 2605.8 m yang berada di bawah permukaan tanah. Pemilihan sistem proteksi katodik anoda korban disesuaikan dengan kebutuhan arus proteksi pada pipa. Desain awal mengatakan bahwa dibutuhkan 10 buah anoda dengan waktu desain 20 tahun. Namun, di lapangan ditemukan telah terjadi beberapa kali kebocoran pada Water Injection Pipeline pada bagian riser tepat di bawah permukaan tanah dengan indikasi menurunnya tegangan proteksi di bawah standard NACE SP 0169 (-850 mV s.d. -1050mV) terutama di area pad C. Setelah dilakukan rancang ulang desain sistem proteksi katodik anoda korban didapatkan hasil bahwa untuk area CPA dibutuhkan 4 buah (17 lb high Magnesium anode) untuk mensuplai kebutuhan arus sebesar 0.167 Ampere. Sedangkan untuk area sawah dibutuhkan 7 buah ( 32lb high magnesium anode) untuk menyuplai arus proteksi sebesar 0.5989 Ampere. Kemudian pada pad C dibutuhkan 2 (32lb high magnesium anode) untuk menyuplai kebutuhan arus sebesar 0.101 Ampere. Hasil rancang ulang yang telah dilakukan disimulasikan menggunakan software ANSYS APDL 15.0 dalam bentuk 2D untuk menilai kelayakan dari desain proteksi katodik. Simulasi dilakukan berbasis steady state thermal electric. Acuan yang dijadikan standar adalah minimal nilai proteksi yang harus dipenuhi pada desain SACP 2D yaitu 3.3 x 10-4 Ampere. Dari empat variable potensial proteksi yang disimulasikan didapatkan hasil bahwa kriteria arus proteksi minimal dapat tercapai saat potensial proteksi sebesar -882 mV, -950 mV, 1094 mV. Sedangkan pada potensial proteksi -785 mV terdapat area di sekitar pipa yang nilai arus proteksinya kurang dari kriteria yang ditetapkan. Hal ini sesuai dengan standar NACE SP 0169 sehingga desain proteksi katodik yang telah dirancang dapat diterima. ================================================================================================ Sacrificial anode cathodic protection system is one method of corrosion control. The mechanism is to connect the structure to be protected with other metals that are more active, so that the structure become protected and other metals corroded. Water Injection Pipeline analyzed here is underground pipeline which has a length of 2605.8 m. Selection of sacrificial anode cathodic protection system tailored to the needs of current protection on the pipe. The initial design say that it takes 10 pieces of anode with 20 years of design time. However, leakage has been occurred several times in the Water Injection Pipeline, specifically on the buried riser at pad C. After re-design sacrificial anode cathodic protection system result showed that the CPA needed 4 pieces (17 lb high magnesium anode) to supply a current of 0167 Amperes. As for the farm area needed 7 pieces (32lb high magnesium anode) to supply current at 0.5989 Ampere. Then pad C took 2 (32lb high magnesium anode) to supply a current of 0101 Ampere. The result of redesign next simulated using ANSYS APDL 15.0 in 2D to assess the feasibility of the design of cathodic protection. The simulation was performed based Electric thermal steady state. The reference standard used is the minimum value of the protection that must be met of 3.3 x 10-4 Ampere. Four protective potential variables simulated showed that current protection can be achieved when the protective potential reached -882 mV, -950 mV, 1094 mV. While at a potential of -785 mV, it was found that the pipe protection current value is less than the specified criteria. This is in accordance with the NACE standard SP 0169 so that the design of cathodic protection has been designed is acceptable.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: ANSYS thermal electric analysis, NACE SP 0169, Proteksi Katodik Anoda Korban, Water Injection Pipeline, Sacrificial Anode Cathodic Protection.
Subjects: T Technology > T Technology (General) > T55 Industrial Safety
T Technology > TJ Mechanical engineering and machinery > TJ164 Power plants--Design and construction
Divisions: Faculty of Industrial Technology > Material & Metallurgical Engineering > (S1) Undergraduate Theses
Depositing User: MUSTIKA DWI ERLINDA
Date Deposited: 25 Jan 2017 03:56
Last Modified: 27 Jan 2017 03:31
URI: http://repository.its.ac.id/id/eprint/1826

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