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All Journal Jurnal Vokasi Sinergi Polmed : Jurnal Ilmiah Teknik Mesin INTERNATIONAL JOURNAL OF MECHANICAL COMPUTATIONAL AND MANUFACTURING RESEARCH
Ritonga, Fatima Sari
Unknown Affiliation
Automotive Engineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Comparison of cutting speed variations in the laser cutting process on the results of SS400 steel plate products Amalia, Mutia; Purba , Adi Syahputra; Rafly, Stevian; Cuana, Rona; Ritonga, Fatima Sari
International Journal of Mechanical Computational and Manufacturing Research Vol. 14 No. 1 (2025): May: Mechanical Computational And Manufacturing Research
Publisher : Trigin Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35335/computational.v14i1.258

Abstract

Computer Numerical Control (CNC) laser cutting as a manufacturing tool for plate cutting, where industrial players are encouraged to get maximum results. Laser cutting is one of the tools used by the industrial world to maximize cutting results. The aim of this research is to determine the results of differences using cutting speed parameters on SS400 steel plate with a thickness of 1 mm using CNC fiber laser cutting on the surface roughness of the material. The method used in this research is a real experimental research method and data analysis to analyze the parameters of cutting plates using laser cutting on surface roughness with the number of experiments being replicated 2 times for the research process by testing surface roughness using Surface Roughness.
Sosialisasi Standar Operasional Prosedur Kesehatan dan Keselamatan Kerja pada Laboratorium IPA SMA Swasta Dr. Wahidin Sudirohusodo Boangmanalu, Eka Putra Dairi; Marbun, Abri Andry Saresa; Ritonga, Fatima Sari; Amalia, Mutia; Husnasari, Khalila
Jurnal Vokasi Vol 9, No 2 (2025): Juli
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/vokasi.v9i2.7232

Abstract

Laboratorium memiliki peran yang sangat penting untuk pengembangan pengetahuan siswa. Laboratorium yang baik tentunya harus dilengkapi dengan fasilitas-fasilitas seperti alat maupun bahan yang memadai dan baik untuk digunakan dan pengguna harus memiliki pengetahuan tentang pengenalan bahan yang tersedia di laboratorium. Berdasarkan hasil survei dengan guru IPA di SMA Dr. Wahidin Sudirohusodo, diketahui bahwa di laboratorium IPA belum tersedia modul pedoman K3 laboratorium. Kegiatan pengabdian pada masyarakat (PKM) ini bertujuan untuk memberikan pemahaman dasar kepada siswa maupun guru di laboratorium IPA di lingkungan SMA Wahidin, sehingga dapat meminimalisir risiko kecelakaan dan memberi pengetahuan tentang tahapan yang dilakukan apabila terjadi kecelakaan. Kegiatan diikuti oleh 40 orang siswa dan 10 orang guru melalui penyampaian materi secara ceramah dan praktik penerapan K3. Metode yang digunakan pada pengabdian ini adalah ceramah dan tanya-jawab berupa keadaan alat keselamatan yang ada di laboratorium sekolah. Kegiatan pengabdian ini dilaksanakan mulai tahap survei sampai kegiatan evaluasi dengan hasil evaluasi setelah kegiatan, menunjukkan bertambahnya pengetahuan siswa tentang alat keselamatan kerja di laboratorium
ANALISIS EFISIENSI BOILER MENGGUNAKAN BAHAN BAKAR BIOMASSA DI PLTU PT. GIP GROWTH ASIA Nainggolan, Rufinus; Ritonga, Fatima Sari; Juwita, Erna; Bangun, Ary Johanda; Marbun, Abri Andry Saresa
SINERGI POLMED: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 2 (2025): Edisi Agustus
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/sinergipolmed.v6i2.2498

Abstract

Boiler atau ketel uap yang dimiliki oleh PLTU PT. Global Inovasi Prima Growth Asia adalah jenis ketel pipa air Merek TAKUMA N2200 dengan spesifikasi tekanan kerja 46 Bar, temperatur 380oC, dan kapasitas 70 ton/jam. Boiler digunakan untuk pembangkitan listrik 15 MW dengan seluruhnya menggunakan bahan bakar biomassa. Penelitian ini mengkaji nilai efisiensi boiler yang menggunakan tiga jenis biomassa, yang terdiri dari fiber (40,395%), kayu giling (40,569%), dan sekam padi (19,036%)., harga nilai kalor atas atau HHV 19.714 kJ/kg dan nilai kalor bawah atau LHV 17.122,776 kJ/kg. Data pengoperasian boiler yang diperoleh tanggal 21 Juni 2024, menunjukkan tekanan sebesar 34,62 Bar, temperatur 372,62oC, dan kapasitas uap 65,62 ton/jam sehingga diperoleh efisiensi boiler sebesar 58,25%. Efisiensi aktual boiler biomassa lebih rendah dari efisiensi teoritis yang diharapkan berdasarkan data operasional boiler (63,3%) mungkin disebabkan oleh variasi kelembaban bahan bakar yang digunakan.
Dimensional check of weld neck flange based on ASME B16.5 Ritonga, Fatima Sari; Purba, Adi Syahputra; Simanjuntak, Jefri Kemri Rodi Samuel; Fadilah, Nurul; Amalia, Mutia
International Journal of Mechanical Computational and Manufacturing Research Vol. 14 No. 2 (2025): August: Mechanical Computational And Manufacturing Research
Publisher : Trigin Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35335/computational.v14i2.268

Abstract

This study aims to verify that the dimensions of a weld neck flange conform to ASME B16.5 standards. The flange used is a raised face type made of carbon steel ASTM A105N with 16-inch NPS, selected for its corrosion resistance, and welded with UNS 006625, a nickel-rich alloy that enhances corrosion protection. Dimensional checks were performed on five samples, each measured three times, using both visual inspection and measuring tools, including a roughness comparator and vernier caliper. Key dimensions measured include outside diameter (705 mm, tolerance +4 mm/-1 mm), inside diameter (333.3 mm, ±1.5 mm), bolt circle diameter (616 mm, ±1.5 mm), flange thickness (88.90 mm, +3 mm), and hub thickness (30.43 mm post-welding, with tolerance not less than 12.5% of pipe wall thickness) the visual inspection assessed surface roughness within the acceptable range of 3.2 µm to 6.3 µm. The inspection results showed that all measured dimensions were within the permissible limits, confirming that the weld neck flange meets the requirements of ASME B16.5.
Co-Authors Amalia, Mutia Bangun, Ary Johanda Boangmanalu, Eka Putra Dairi Cuana, Rona Erna Juwita Husnasari, Khalila Marbun, Abri Andry Saresa Nainggolan, Rufinus Nurul Fadilah, Nurul Purba , Adi Syahputra Purba, Adi Syahputra Rafly, Stevian Simanjuntak, Jefri Kemri Rodi Samuel