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Rafiuddin
Universitas Pejuang Republik Indonesia
Engineering

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Analisis Produktivitas Alat Muat Dan Angkut Pada Pengupasan Overburden Pit Pelikan South Extension Fleet EX768 PT Pamapersada Nusantara Distrik KPCS Marcel; Rafiuddin; Syamsuddin
Journal Teknik Dan Teknologi  Vol. 2 No. 02 (2026): Juni
Publisher : Fakultas Teknik UPRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.67494/jtt.v2i02.31

Abstract

Kegiatan pengupasan lapisan penutup merupakan tahapan penting dalam penambangan atubara karena Berpengaruh langsung terhadap pencapaian target produksi. Produktivitas alat gali muat dan alat angkut menjadi indikator utama dalam menilai efektivitas kinerja operasi penambangan. Penelitian ini bertujuan untuk menganalisis produktivitas alat gali muat dan alat angkut pada kegiatan pengupasan overburden di Pit Pelikan South Extension Fleet EX768 PT. Pamapersada Nusantara Distrik KPCS, Kabupaten Kutai Timur, Provinsi Kalimantan Timur. Kajian teori yang digunakan meliputi konsep produktivitas alat mekanis, waktu siklus , efisiensi kerja, faktor pembengkakan, faktor pengisian , serta keserasian alat kerja (faktor kesesuaian). Metode penelitian yang digunakan adalah metode kuantitatif dengan pendekatan studi kasus. Pengumpulan data dilakukan melalui observasi lapangan dan studi literatur, dengan data primer berupa waktu siklus alat gali muat dan alat angkut, efisiensi kerja, faktor pengisian , serta data hambatan waktu, sedangkan data sekunder diperoleh dari laporan perusahaan dan referensi pendukung. Hasil penelitian menunjukkan bahwa waktu siklus alat gali muat sebesar 0,56 menit dan waktu siklus alat angkut sebesar 6,3 menit. Nilai efisiensi kerja alat gali muat sebesar 80% dan alat angkut sebesar 75%, dengan swell factor 0,85 dan fill factor 1,1. Berdasarkan parameter tersebut, diperoleh produktivitas alat gali muat dan alat angkut sebesar 1.122 bcm/jam. Nilai match factor sebesar 1,07 menunjukkan bahwa keserasian kerja alat berada pada kondisi cukup optimal.
Analisis Pengaruh Kedalaman Dan Diameter Lubang Bor Terhadap Hasil Peledakan Di Tambang Terbuka Tesi; Rafiuddin; Syamsuddin
Journal Teknik Dan Teknologi  Vol. 2 No. 02 (2026): Juni
Publisher : Fakultas Teknik UPRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.67494/jtt.v2i02.32

Abstract

Blasting is an important stage in open-pit mining aimed at breaking rock material to facilitate excavation and loading processes. Fragmentation quality is influenced by blasting design parameters, particularly the depth and diameter of blast holes. This study used drilling geometry data, blasting geometry, explosive consumption, and fragmentation results analyzed using Split Desktop software to determine the effect of variations in blast hole depth and diameter on fragmentation distribution. The results showed that greater blast hole depth produces finer fragmentation due to increased blasting energy. Larger blast hole diameters also increase explosive loading capacity, resulting in more evenly distributed blasting energy. The proper combination of blast hole depth and diameter produces optimal fragmentation in accordance with company operational standards.
PERHITUNGAN CADANGAN NIKEL LATERIT MENGGUNAKAN METODE INVERSE DISTANCE WEIGHTING Muh. Adib Hadriawan; Rafiuddin; Syamsuddin
Journal Teknik Dan Teknologi  Vol. 2 No. 02 (2026): Juni
Publisher : Fakultas Teknik UPRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.67494/jtt.v2i02.36

Abstract

This research aims to analyze the effect of holding time in the Post Weld Heat Treatment (PWHT) process on the mechanical properties of ST42 steel that has undergone welding using the Shielded Metal Arc Welding (SMAW) method. The main focus of the study is the correlation between variations in heat holding time at a certain temperature and changes in hardness and toughness.The method used is an experiment with variations in holding time, followed by rapid cooling to maintain microstructural homogeneity. Hardness testing is conducted using Vickers or Rockwell methods, while toughness is analyzed through bending/impact tests depending on the appropriate method. The microstructure is examined to check for changes in the fractions of ferrite and pearlite, as well as grain size influenced by heat retention.In conclusion, the holding time during PWHT has a significant effect on the hardness and toughness of ST-42 steel. Adjusting the duration of the heat hold can be used as a control variable to optimize the mechanical properties of the weld, balancing strength and crackresistance according to the needs of engineering applications.
Co-Authors Marcel Muh. Adib Hadriawan Syamsuddin Tesi