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Arifin Pahlawan, Ilham
Universitas Muhammadiyah Gresik
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ANALISIS KEGAGALAN PADA HASIL PENGELASAN DI PT. AUTOKORINDO PRATAMA Ikhsanudin Ramadhan; Rilo Chandra Muhamadin; Ilham Arifin Pahlawan
ENIGMA: Engineering in Green Machinery Vol. 1 No. 1 (2024): Desember
Publisher : Universitas Muhammadiyah Gresik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30587/enigma.v1i1.8841

Abstract

PT AUTOKORINDO PRATAMA adalah salah satu perusahaan yang mampu memproduksi lebih dari 600.000 velg setiap tahunnya. Pada proses pengelasan velg sering kali terjadi proses cacat pada tahap pengelasan seperti pinhole, Overlap, Blow Hole, Over Rim, dan Over Disc. Penelitian ini bertujuan untuk menganalisis jenis defect yang sering muncul, mengetahui faktor penyebab serta memberikan solusi perbaikan. Penelitian ini menggunakan metode DMIC (Defne, Measure, Improve , Control). berdasarkan pengolahan data diperoleh cacat pada hasil pengelasan yang sering muncul yakni pinhole, Overlap, Blow Hole, Over Rim, dan Over Disc. Faktor penyebab terjadinya cacat (defect) pada hasil pengelasan yang ditinjau dari aspek mesin, manusia, metode, material dan lingkungan yaitu ampere pada mesin yang tidak stabil, operator yang kelelahan, operator kurang terampil, penyetelan ampere pada pengelasan yang terlalu besar, kurangnya pembersihan, jarak busur yang terlalu jauh, material kotor, material basah, lingkungan yang kurang nyaman dan terjadinya hembusan angin disekitar area pengelasan. Beberapa perbaikan yang dapat dilakukan adalah pengecekan peralatan sebelum pekerjaan dimulai, perbaikan preparation pra pengelasan berupa dilakukannya pembersihan terhadap material yang akan dilakukan pekerjaan pengelasan , perbaikan teknik pengelasan.
EVALUASI SCHEDULE LINTEL SET UNTUK TEROWONGAN BAWAH TANAH Rengga wijaya; Ilham Arifin Pahlawan
ENIGMA: Engineering in Green Machinery Vol. 2 No. 1 (2025): Juli
Publisher : Universitas Muhammadiyah Gresik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30587/enigma.v2i1.9860

Abstract

Penjadwalan (scheduling) merupakan salah satu aspek paling krusial dalam manajemen proyek kontruksi. Penerapan metode kurva-s dalam monitoring dan pengendalian jadwal proyek merupakan salah satu cara untuk mengevaluasi efektivitas dalam memantau kemajuan proyek. Kurva-s digunakan sebagai alat visual untuk memetakan progres aktual di bandingkan dengan rencana yang telah ditetapkan. Data yang di peroleh melalui laporan harian dievaluasi dan diplot pada kurva-s untuk memberikan gambaran visual mengenai proyek. Dari kurva S perencanaan dan aktual mulai terjadi deviasi pada hari ke 2. Hal ini dikarenakan karena keterlambatan pengiriman material dan kondisi cuaca tidak yang tidak mendukung. Selisih deviasi antara rencana dan aktual terdapat terbesar terdapat pada hari ke 9 dengan selesih 2,59. Dari selisih tersebut, dilakukan penambahan operator pada proses fit up drilling dan welding di hari ke 10 untuk menyelesaikan proyek sesuai rencana awal. Melalui penerapan kurva-s, tim management proyek dapat dengan cepat mengidentifikasi dan mengatasi penyebab keterlambatan, termasuk penyesuaian alokasi sumber daya dan percepatan aktivitas kritis. Laporan ini menunjukan bahwa penggunaan kurva s sebagai alat kontrol dan monitoring dapat membantu dalam pengambilan keputusan yag lebih cepat dan efektif terutama dakam menjaga agar proyek tetap berada pada jalur yang di rencanakan.
SISTEM KENDALI TEKANAN UDARA SEKUNDER PADA FORCED DRAFT FAN DI PLTU PAITON Alfian Prasetyo Aji; Ilham Arifin Pahlawan
ENIGMA: Engineering in Green Machinery Vol. 2 No. 2 (2025): Desember
Publisher : Universitas Muhammadiyah Gresik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30587/enigma.v2i2.10921

Abstract

This research aims to assess the effectiveness of using Pressure Transmitters on the Force Draft Fan in a Steam Power Plant. The evaluation is conducted through a series of tests to measure air pressure and analyze the response of the Inlet damper position in regulating airflow. Data were collected through literature studies, direct field observations, and interviews with relevant practitioners. The measurement results show significant pressure variations. For a set point of 100 mmWG, the measured air pressure values range from 94.37 mmWG to 111.31 mmWG, and the percentage opening of the Inlet damper for FDF A & B varies between 58.28% to 63.07%. There are some measurement errors that need to be further evaluated, with error values ranging from -11.31 to 7,72 mmWG. Nevertheless, the system still operates within acceptable limits.
The ANALISIS SISTEM SINKRONISASI DAN DISTRIBUSI DAYA GENSET PADA PROYEK DKUT PK-19 JIIPE GRESIK: Universitas Muhammadiyah Gresik Mohammad Rizal Chasi Pratama; Ilham Arifin pahlawan
ENIGMA: Engineering in Green Machinery Vol. 2 No. 2 (2025): Desember
Publisher : Universitas Muhammadiyah Gresik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30587/enigma.v2i2.10970

Abstract

TThe DKUT PK-19 Infrastructure and Landscape Development Project at the JIIPE Gresik industrial area is a vital Bank Indonesia project requiring reliable and continuous power supply. To ensure energy availability, PT Jaya Teknik Indonesia (JTI) installed a backup power system consisting of two Mitsubishi generator units, MGS1500CL and MGS1300R L50. This study aims to analyze the synchronization and power distribution system between generators and their connection to the PLN grid. The research method includes field observation and operational parameter measurements, such as voltage, current, and frequency during testing, synchronization, and power distribution. Results indicate that synchronization between generators successfully maintains load balance with current differences below 5% across phases. The applied three-phase four-wire (3Φ-4W) distribution system effectively delivers power through the Main Distribution Panel (MDP) to subpanels throughout the project. The automatic synchronization system (auto-synchronizer) enhances fuel efficiency and voltage stability.
The Perakitan Alat Vacum Test ( NDT ) Di PT. Kintomo Engineering Group Argyono Cahyono Adi; Ilham Arifin Pahlawan
ENIGMA: Engineering in Green Machinery Vol. 3 No. 1 (2026): Juli
Publisher : Universitas Muhammadiyah Gresik

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Abstract

This study discusses the assembly and testing process of a Vacuum Test device as part of a Non-Destructive Testing (NDT) method to detect leakage in welded joints. The project was carried out at PT. Kintomo Engineering Group, Gresik, aiming to understand the working principles, assembly procedures, and effectiveness of the Vacuum Test tool in industrial applications. The methodology included direct observation, technical participation, and structural simulation using Autodesk Inventor software. The test results showed that the assembled Vacuum Test device could reach a pressure of 50–100 mbar and effectively detect defects such as porosity and micro-cracks in weld joints. Simulation analysis indicated a maximum stress of only 0.613 MPa with a safety factor of 15, confirming that the tool is structurally safe for repeated use. These findings demonstrate that the Vacuum Test method is an effective and reliable visual inspection technique for detecting leakage without damaging the tested material
STRATEGI PERAWATAN ROTATING EQUIPMENT SECARA BERKALA PADA POMPA TAGGING 4160 B PT. XYZ Muhammad Rifki Rakhman; Ilham Arifin Pahlawan
ENIGMA: Engineering in Green Machinery Vol. 3 No. 1 (2026): Juli
Publisher : Universitas Muhammadiyah Gresik

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Abstract

PT. XYZ is a company engaged in palm oil processing that produces various derivative products, one of which is biodiesel. The reliability of this equipment determines operational efficiency, so an appropriate and sustainable maintenance strategy is needed. The author analyzed the periodic maintenance strategy on rotating equipment using direct field observation methods, interviews with technicians and equipment managers, and literature studies as a basis for comparison and validation. Based on the analysis results, it was found that several main causes of damage to rotating equipment are excessive vibration due to misalignment and unbalance, bearing damage due to inadequate lubrication, overheating of electric motors due to suboptimal cooling systems, and wear and tear of mechanical components due to service life and high workloads. To reduce the risk of downtime and increase the service life of the equipment, a periodic maintenance strategy was developed that includes condition monitoring as a measure for early detection of damage symptoms, preventive maintenance carried out routinely and scheduled to prevent damage, predictive maintenance based on the actual condition of the equipment through operational data analysis, and corrective maintenance as a corrective action when damage occurs.
Co-Authors Agin Viakri Dagmar Alfian Prasetyo Aji Alviani Hesthi Permata Ningtyas Alviani Hesthi Permata Ningtyas Argyono Cahyono Adi Arif Prambudiarto, Benny Ayunaning, Kholidia Burhanudin Rahmat Darmawan Chandra Muhamadin, Rilo Choirul Anam Fiska Yohana Purwaningtyas Hidayat Ikhsanudin Ramadhan Iqbal Maulana Irfan Arif Evendi Mochammad Afif Lutfi Moh. Jufriyanto Moh. Jufriyanto Mohammad Rizal Chasi Pratama Mohammad Rizal Safri Muhammad Bima Alamsyah Muhammad Nuril Istighfar Muhammad Rifki Rakhman Muhammad, Katon Mustakim, Zainal Permata Ningtyas, Alviani Hesthi Poerwo Sudirjdo Purwo Sudirdjo R. Achmad Djazuli Rafli Pramudia Putra Rafly Arifin, Muhammad Rengga wijaya Rilo Chandra Muhamadin Rizkyansyah Alif Hidayatullah Siti Duratun Nasiqiati Rosady Tarisa Dwi Anastasya Zan Nubah Arifah Chafsoh Rohmah