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"Sistem proteksi katodik yang digunakan untuk melindungi jaringan pipa distribusi gas dari serangan korosi merupakan bagian yang penting dari sebuah instalasi pipa. Dalam pengukuran sistem proteksi katodik yang dilakukan, selalu ada nilai IR drop yang akan mengganggu keakuratan pengukuran. IR drop ini sangat dipengaruhi oleh karakteristik lingkungan tanah. Penelitian ini bertujuan untuk menganalisis pengaruh kondisi lingkungan dan resistivitas tanah terhadap nilai IR drop pada sistem proteksi katodik. Analisa dilakukan pada data-data hasil survey lokasi, hasil survey resistivitas tanah, hasil pengukuran ON- Instant OFF Potential; dan hasil pengujian sampel tanah pada nilai resistivitas tanah tertentu. Didapatkan lebih dari 47 lokasi mempunyai nilai IR drop lebih dari 100 mV. Nilai IR drop rata-rata untuk semua lingkungan sebesar 100 mV. Nilai IR drop rata-rata lingkungan pinggir laut sebesar 12 mV, tanah sawah sebesar 104 mV, pinggir sungai sebesar 83 mV, pinggir selokan sebesar 88 mV, taman/kebun sebesar 107 mV, dan pinggir jalan sebesar 104 mV. Berdasarkan data penelitian dapat disimpulkan bahwa kriteria minimal proteksi katodik -850 mV vs Cu/CuSO4 ON Potential tidak cukup untuk melindungi jaringan pipa dari serangan korosi, karena itulah kriteria tersebut harus diubah. Namun perubahan kriteria proteksi katodik tersebut selain karena mempertimbangkan adanya IR drop, harus mempertimbangkan pula faktor lain seperti historikal data dan pengamatan di lapangan.

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The cathodic protection system used to protect gas distribution pipelines from corrosion attacks is an important part of a pipeline installation. In the measurement of the cathodic protection system performed, there is always an IR drop value that will interfere with the measurement accuracy. IR drop is strongly influenced by soil environmental characteristics. This study aims to analyze the effect of environmental conditions and soil resistivity to the value of IR drop on cathodic protection system. The analysis was performed against the survey location data, the results of the soil resistivity survey, the ON Instant OFF Potential measurement result and the result of testing of soil samples at a certain soil resistivity value. There are more than 47 of locations that have IR drop values greater than 100 mV. The average drop IR value for all environments of 100 mV. The average IR drop value of the seafront is 12 mV, the wetland is 104 mV, riverbanks is 83 mV, the sewer edge is 88 mV, the park garden is 107 mV, and the roadside is 104 mV. Based on the research data, it can be concluded that the minimum criteria of cathodic protection 850 mV vs Cu CuSO4 ON Potential is not enough to protect the pipeline from corrosion attack, therefore the criteria must be changed. However, the minimum criterion of cathodic protection criterion in apart of considering the IR drop, should also consider other factors such as historical data and field observations."

"Penentuan desain sistem Impressed Current Cathodic Protection di bagian dasar tanki T-1301 A/B/C/D dan AB Rerun Tank di PT XX Kalimantan Timur yang meliputi proses perhitungan kebutuhan arus dan jumlah tegangan DC keseluruhan sistem struktur serta pengaruh penambahan struktur lain yang meliputi electrical grounding system telah berhasil dilakukan dan secara efektif telah dikontrol di lapangan. Selain proses desain engineering, variasi lapisan tahanan tanah terhadap ketidakseimbangan IR Drop pada sistem Impressed Current Cathodic Protection di bagian dasar tanki T-1301 A/B/C/D dan AB Rerun Tank di PT XX Kalimantan Timur dan pengaruhnya terhadap distribusi potensial telah dipelajari.Dari hasil pembuktian di lapangan menunjukkan bahwa dibutuhkan 10 anoda tambahan dengan total kebutuhan arus DC 154 Ampere dan kebutuhan tegangan DC 32 Volt , selain itu tahanan tanah yang tinggi diatas 3000 ohm cm akan menyebabkan pembacaan error yang tinggi.pH tanah yang rendah berkisar 5-7 akan mengurangi tahanan tanah, dan meningkatkan distribusi arus proteksi katodik.

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Engineering design calculation for bottom section of T-1301 A/B/C/D dan AB Rerun Tank at PT XX Santan Terminal including current requirement and DC voltage calculation followed by additional structure such electrical grounding system has been already successfully implemented and controlled at field. Furthermore, effect of soil layer resistivity and pH of soil against disproportion of IR Drop voltage including its effect to potential distribution has been already successfully observed. Another influences such depth and location of anode groundbed determination along with establishment of impressed current cathodic protection main tools and equipments as external corrosion control method has been defined as the most effective way for controlling potential distribution against structure.

As per verification results from site, the results showed that the cathodic protection required 10 additional anode (MMO), with minimum amperage DC supply is 154 A, minimum voltage supplied is 32 Volt, it has been identified that high soil resistivity above 3000 ohm.cm would cause error reading. Naturally, acid soil in about pH 5-7, would decrease soil resistivity and enhanced potential distribution from anode to tank structure."