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All Journal Inersia : Jurnal Teknik Sipil IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin
Puspawan, Angky
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Automotive Engineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analisa Head Losses dan Efisiensi Pompa Sentrifugal Vogel dari Instalasi Menara Pendingin ke Penampung Utama Puspawan, Angky
Inersia: Jurnal Teknik Sipil Vol. 14 No. 2 (2022)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/ijts.14.2.117-125

Abstract

Di pabrik industri bidang pengolahan dan pembuatan pupuk urea di Indonensia memerlukan bahan baku utama yaitu adalah gas alam cair (Liquid Natural Gas/LNG), air (H2O), dan udara (air). Ketiga bahan baku utama tersebut penting diolah dan menghasilkan nitrogen (N2), hidrogen (H2), dan karbondioksida (CO2). Amoniak (NH3) adalah hasil reaksi gas nitrogen (N2) dan hidrogen (H2). Selanjutnya proses berikutnya adalah mencampurkan amoniak (NH3) dengan karbondioksida (CO2) bereaksi dan menghasilkan pupuk urea. Pupuk urea sangat penting dalam membantu pertumbuhan tanaman dalam pengolahan pertanian dan perkebunan. Salah satu bahan baku utama adalah air (H2O). Oleh sebab itu, letak atau lokasi pabrik industri pupuk ini seyogyanya atau selayaknya harus mendekati sumber air baku yaitu air laut ataupun air sungai. Tujuan letak atau lokasi pabrik pupuk ini mendekati sumber air adalah agar kebutuhan air murni tetap kontinyu dan terjaga. Dikarenakan kebutuhan (demand) akan air sangat banyak, maka dibuatlah aliran air yang disesuaikan dengan kebutuhan dengan membangun stasiun pompa. Kebutuhan air yaitu untuk air pendingin kemudian dialirkan ke penampung utama untuk bahan baku pembuatan pupuk. Pompa digunakan sebagai alat untuk memindahkan fluida dari suatu tempat ke tempat lain melalui media pipa dengan terjadinya perubahan tekanan pada fluida. Pompa biasanya untuk fluida bersifat cair. Pada instalasi pompa dari instalasi menara pendingin menuju ke penampung utama adalah pompa sentrifugal vogel, dimana kerugian head pada jalur pipa sisi isap 0,044 m, kerugian head jalur pipa sisi keluar 0,761 m dengan total kerugian head 0,805 m dan efisiensi atau performa pompa sentripugal Vogel adalah 68,707%.
A PROSES TUBE EXPANSION DAN SEAL WELDING PADA HEAT EXCHANGER Nuralif, Raihan Shallu; Puspawan, Angky; Gumilang, Faisal
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 10 No. 1 (2026): April 2026
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v10i1.45168

Abstract

This study examines the tube expansion process in heat exchangers at PT IHI Power Service Indonesia using the heavy expand method with a pneumatic expander. As a subsidiary of Japan’s IHI Corporation, the company focuses on repair, maintenance, and fabrication for the power generation industry in Indonesia. The research aims to understand the tube expansion process, the function and operation of the expander tool, and factors that affect work quality and efficiency. The fabrication process includes technical design, material processing, assembly, and component testing. Data were obtained through direct observation, interviews, and technical documentation. Results show that the pneumatic expander improves joint quality and reliability compared to conventional methods. This expansion technique ensures tight connections between tubes and tube sheets, which is essential for heat exchanger performance. The study also highlights the importance of proper torque control and operator training in maintaining process consistency. Overall, the use of pneumatic expansion tools enhances fabrication standards and supports operational efficiency in power plant systems. The findings are expected to contribute to improving productivity at PT IHI Power Service Indonesia and serve as a reference for similar industries focused on heat exchanger fabrication and maintenance.
Pengaruh Variasi Kemiringan Front Wall Dan Perioda Gelombang Air Laut Terhadap Daya Udara Yang Dihasilkan Dan Efisiensi Pada Model Oscillating Water Column (Owc) Pembangkit Tenaga Gelombang Peldiansah Ismael , Alif Rahman; Supardi, Nurul Iman; Puspawan, Angky; Witanto, Yovan; Alqap, ASF
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 1 (2026): April
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i1.391

Abstract

Ocean wave energy is a renewable resource with significant potential for development in Indonesia, given its vast coastal areas. One technology for converting wave energy into usable power is the Oscillating Water Column (OWC) system. This system utilizes the vertical motion of seawater inside a chamber to generate airflow, which then drives a turbine to produce energy. This study aims to analyze the effect of oscillating column tilt angle and wave period variations on the energy conversion efficiency of an OWC model, and to determine the optimal tilt angle for maximum efficiency in converting wave power into air power. The research was conducted experimentally using a laboratory-scale OWC model measuring 1500 mm in length, 300 mm in width, and 500 mm in height. The oscillating column tilt angles tested were 0°, 35°, 40°, and 45°. Artificial waves were generated using a motor drive at 30 rpm, 40 rpm, and 50 rpm, producing wave periods of 2.1 seconds, 1.6 seconds, and 1.2 seconds, respectively. Measured parameters included air velocity, motor speed, wave period, wavelength, and wave height. Calculations determined wave power, air power, and system efficiency. Results show tilt angle and wave period significantly affect OWC efficiency, with the highest efficiency reaching 41.00% at 40° tilt and 1.6-second waves.
Co-Authors Alqap, ASF Gumilang, Faisal Nuralif, Raihan Shallu Nurul Iman Supardi Peldiansah Ismael , Alif Rahman Yovan Witanto