ABSTRAK PENGARUH KADAR AIR DAN JENIS TANAH TERHADAP PENYEDIAAN ARUS SISTEM IMPRESSED CURRENT CATHODIC PROTECTION UNTUK PROTEKSI KOROSI PIPA BAJA. Faktor lingkungan yang menjadi salah satu indikator utama terhadap korosi pada tanah adalah resistivitas dan kadar air tanah. Tujuan penelitian adalah untuk menganalisis pengaruh resistivitas dan kadar air tanah terhadap kebutuhan arus proteksi sistem ICCP pada material pipa API 5L Grade B sebagai katoda yang yang diberi variasi coating (coating

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... hnya, tanpa coating dan cacat gores berbentuk persegi dengan luas 500 mm 2). Variasi kadar air adalah 0% (kondisi kering) dan 25%. Anoda menggunakan grafit, rectifiernya sebagai penyearah arus dan elektroda referensi Cu/CuSO 4 sebagai elektroda acuan. Pengukuran arus proteksi ini dilakukan selama 7 hari dengan pengambilan data setiap hari. Dari hasil penelitian terlihat bahwa dengan bertambahnya kadar air dalam tanah akan menyebabkan nilai resistivitas tanah menurun, karena bertambahnya jumlah air dalam tanah akan mempermudah aliran arus. Nilai resistivitas tanah yang semakin tinggi akan membutuhkan arus proteksi yang rendah karena pada tanah dengan nilai resistivitas tinggi memiliki tahanan yang tinggi (lemah menghantar listrik atau bersifat isolator). Sedangkan dengan kadar air tanah yang tinggi nilai arus proteksi semakin meningkat karena air mempermudah ionisasi elektron dalam tanah sehingga mempermudah aliran arus ABSTRACT THE EFFECT OF VARIATIONS IN RESISTIVITY AND SOIL WATER CONTENT TOWARDS CURRENT IN IMPRESSED CURRENT CATHODIC PROTECTION SYSTEM AT STEELPIPE. Corrosion is the main problem of the failure of metal pipe and it is unavoidable from underground piping system. The frequent method that been used for reducing corotion in underground pipe by giving coat and ICCP installation. The environment factor become the most indicator towards ground corotion is the resistivity and soil water content. The purpose of this research are to analyze the resistivity effect and soil water content towards the requirement of ICCP current protection system at metal pipe API 5L Grade B as a chatode that been add with the coating variation (full coating, without coating and square form scratch defect with 500 mm 2 wide). The 0% of water content variation (dry condition) and 25%. We use graphite as an anode and current rectifier and Cu/ CuSO 4 electrode as a reference. The measurement of this current protection been held for 7 days with data retrieval everyday. From this research it show us that the increase of soil water content level make the soil resistivity reduce, because the increasing of the water level in the soil can ease the current. The soil resistivity number can be higher but it needs the low current protection, this is all due to the soil with the higher resistivity have the high resistance (too weak to deliver the electric current or isolator). Meanwhile with the high level of soil water content, the number of the current protection will be increase, this is all due to the water can easily absorb the ionisation of the electron in the soil so it can ease the current flow. According to the hypothesis of the authors, the higher of resistivity will make the current of protection will be even lower.