Remaining Service Life Struktur Conveyor K pada Tambang Batubara PT XYZ di Kabupaten Tapin, Provinsi Kalimantan Selatan

Abstract

Abstract. The conveyor is a hauling equipment commonly in the mining industry, both for mining and processing of mineral resources, however, due to its carbon steel composition, the conveyor structure is prone to corrosion from its surrounding environment. Therefore, a study was conducted to determine the type of corrosion, corrosion control methods, Corrosion Rate, and Remaining Service Life of the conveyor structure.The methodology employed in this research is the method of measuring thickness reduction. These measurements were conducted on a conveyor structure with a length of 96 meters, utilizing 25 test points with the Smart Sensor Ultrasonic Thickness Gauge TT 130 device. The research area is characterized by an average annual rainfall of 253.48 mm, air humidity of 87.12%, and a temperature of approximately 26.61ºC.Uniform corrosion was detected in the conveyor structure, and the corrosion control method used was a three-layer coating system using Seaguard 5000 as a primer, Sherglass FF as an intermediate coating, and Aliphatic Acrylic Modified Polyurethane as a top coating. The Corrosion Rate of the conveyor structure ranged from 0,1860 to 0.3110 mm/year, which falls into the "good" category according to the corrosion resistance table for steel. The conveyor structure was designed to last for 15 years and has been used for 7 years, but its Remaining Service Life is only 6.448 to 9.408 years. Therefore, it is estimated that 11 out of 25 testing points, or 44% of the testing points, will not reach its design life.

Abstrak. Conveyor adalah alat angkut yang sering digunakan di industri pertambangan, baik untuk penambangan maupun pengolahan bahan galian. Namun, karena terbuat dari baja karbon, struktur conveyor akan rawan untuk mengalami korosi akibat lingkungan di sekitarnya. Oleh sebab itu, penelitian ini perlu dilakukan untuk menentukan jenis korosi, metode pengendalian korosi, Corrosion Rate, dan Remaining Service Life struktur conveyor. Metodologi dalam penelitian ini adalah metode pengukuran pengurangan ketebalan. Pengukuran ini dilakukan pada struktur conveyor yang mempunyai panjang 96 meter, dan 25 test point dengan alat Smart Sensor Ultrasonic Thickness Gauge TT 130. Lingkungan pada daerah penelitian memiliki rata-rata curah hujan yang mencapai 253,48 mm per tahun, kelembapan udara sebesar 88,48% dan suhu sekitar 26,61ºC. Korosi merata terdeteksi pada struktur conveyor, dan metode pengendalian korosi yang digunakan adalah metode coating sistem three layers menggunakan Seaguard 5000 sebagai primer coating, Sherglass FF sebagai intermediate coating, dan Aliphatic Acrylic Modified Polyurethane sebagai top coating. Corrosion Rate struktur conveyor sebesar 0,1860 hingga 0,3110 mm/tahun, yang termasuk dalam kategori good berdasarkan tabel ketahanan korosi relatif baja. Struktur conveyor dirancang memiliki umur desain 15 tahun dan telah digunakan selama 7 tahun, namun Remaining Service Life-nya hanya 6,44 hingga 9,40 tahun. Oleh karena itu, diperkirakan 11 dari 25 test point atau 44% test point tidak dapat mencapai umur desainnya.