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All Journal Rekayasa Mesin JURNAL SIMETRIK Journal Mechanical Engineering
Loppies, Leslie S
Jurusan Teknik Mesin, Politeknik Negeri Ambon
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ANALISA LAJU KOROSI PIPA SCH 40 SEAMLESS DENGAN VARIASI MEDIA PENGKOROSIAN AIR PAYAU DAN AIR LAUT Maitimu, Cindy Gabriel; Loppies, Leslie S.; Pellu, Denny Ismail; Huka, Graciadiana I
Journal Mechanical Engineering Vol. 2 No. 2 (2024): Agustus
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v2i2.2920

Abstract

Metals, especially steel, are widely used in various industrial applications due to their strength and durability. However, corrosion is a significant drawback that can shorten the life of the material. This research aims to analyze the corrosion rate of SCH 40 seamless pipes with a variety of corrosion media: brackish water, sea water, aquadess, NaCl solution, and oxygen, in conditions without paint coating and with paint coating. The research method uses the weight loss method according to the ASTM G102-89 standard, where the corrosion rate is measured in millimeters per year (mmpy) by calculating the difference in pipe weight before and after immersion. The results show that the corrosion rate without paint coating is: brackish water 0.00016 mmpy, sea water 0.00014 mmpy, aquadess 0.00016 mmpy, NaCl 0.00015 mmpy, and oxygen 0.0000045 mmpy. Seawater showed the lowest corrosion rate, possibly due to the formation of a passive protective layer. Oxygen had the lowest corrosion rate, indicating that oxygen alone does not cause significant corrosion without moisture. With paint coating, the pipe corrosion rate becomes: brackish water 0.00000125 mmpy, sea water 0.00000125 mmpy, aquadess 0.00000268 mmpy, NaCl 0.00000107 mmpy, and oxygen 0.00000125 mmpy. The use of paint coatings significantly reduces the rate of corrosion, especially in corrosive media such as brackish water, sea water and salt solutions. These results emphasize the importance of paint coatings to extend the service life of pipes by reducing the speed of corrosion. Key words: corrosion, seamless pipe, paint coating, corrosion media, corrosion rate, weight loss method
PENGARUH PENGUJIAN KEKERASAN DAN PENGUJIAN TEKAN TERHADAP KARAKTERISTIK GAYA TUMBUKAN PADA CANGKANG KENARI (CANARIUM INDICUM L) Loppies, Leslie S.; Patty, Alexander A.; Pelasula, Berthy; Lekatompessy, Roy R.; Nanulaitta, Nevada Mario
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1227

Abstract

Kenari (Canarium indicum L) belongs to the Burseraceae family and is one of the endemic fruits in Indonesia, especially Maluku. Walnuts have a tough shell that encloses the flesh, to get the flesh without damaging it careful effort is needed. This study investigated the strength of walnut shells through mechanical testing to determine the amount of impact force needed to break the walnut shell. The mechanical test carried out is a compression test and impact test. The values of these tests assist in determining, measuring, and analyzing the minimum and maximum force loads required to crack a walnut shell. Tests were carried out on walnut shells from 6 different villages on Ambon Island and Saparua Island. The impact test where the highest impact absorption energy value was found in walnut shells from Booi Village, namely 23.18 J/mm2, and the lowest in walnut shells from Morela Village, 22.40 J/mm2. In the compression test where the lowest value was found in walnut shells from Morela village with a value of 3.61 MPa while the highest value was found in walnut shells from Booi village, namely 5.24 MPa. Whereas the minimum compressive force is 16.22 kgf/mm2 and the maximum compressive force is 17.61 kgf/mm2.
Pengaruh Variasi Arus Pengelasan Gas Metal Arc Welding (GWAM) Terhadap Sifat Mekanis Pada Sifat Seamless Huka, Gracia Irene; Loppies, Leslie. S.; Matheus, Josef; Wilujeng, Auliana Diah; Hamid, Abdul
Journal Mechanical Engineering Vol. 1 No. 3 (2023): Desember
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v1i3.2116

Abstract

GMAW welding is a metal joining process with a melting process with the addition of a coil of wire in the form of electrodes and protective gas. Seamlees pipe, also known as seamless pipe, is an iron pipe without a connection. This study aims to produce data from the results of bending and impact testing on seamlees pipes by varying the welding current with a current of 21.5 volts, 22.5 volts, and 23.5 volts in GMAW welding. After the seamless pipe is welded, impact and bending tests are carried out on the seamlees pipe. From the bending/bending strength test, the highest flexural strength occurred at a current of 21.5 and 22.5 volts, while the lowest flexural strength occurred at a current of 23.5 volts. From the impact test, the highest strength occurred at 21.5 and 22.5 volts and the lowest was at 23.5 volts.  Keywords: Seamlees pipe, GMAW welder, Bending Strength, Impact Strength.  
ANALISIA PENENTUAN UMUR PAKAI TANGKI TIMBUN 01-50 TON DI PT.PLN (PERSERO) UIW MALUKU DAN MALUKU UTARA KANTOR PELAYANAN KIANDARAT Rumaday , Gahsar; Loppies, Leslie. S.; Nanulaitta, Nevada J. M.
Journal Mechanical Engineering Vol. 2 No. 1 (2024): April
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v2i1.2580

Abstract

In the oil and gas industry, tanks play a crucial role as storage containers for fluids and fuel oil products, both in the form of volatile, pressurized, and flammable fluids. In addition, tanks are not only found in the oil and gas industry, but also in other sectors such as power plants. In the long period of use, the tank may be damaged due to several factors, including plate depletion caused by cor rosion. This problem can affect the integrity of the tank so that an inspection of the condition of the tank needs to be carried out. The inspection of tank plate thickness and corrosion rate was carried out using the Non-Destructive Examination (NDE) method with the Benetech GM100 Ultrasonic Thickness Gaugge tool. This inspection is urgently needed to determine the remaining life of the tank with reference to the API 653 and API 575 standards. The method used started from literature studies in various references and previous research, after which field data collection was then analyzed in accordance with the findings and applicable provisions. Based on the results of measurements in April 2024, the condition of the 01-50 ton tank is still in good condition, marked by the thickness of course 1-3 is still above the minimum limit that has been determined. For Course 1 Tact is 4.3 mm and Tmin is 0.4064 mm with a corrosion rate of 0.0875 mm/year and a remaining life of 44.49 years. For Course 2 Tact is 4.1 mm and Tmin is 0.2032 mm with a corrosion rate of 0.1125 mm/year and a remaining life of 24.63 years. For Course 3 Tact of 3.9 mm and Tmin of 0.1016 mm with a corrosion rate of 0.1375 mm/year and a remaining life of 28.35 years. It can be concluded that the condition of the 01-50 Ton tank is still in good condition. Keywords: (tank, power plant, plate thickness, corrosion rate, remaining tank life)
ANALISIS LAJU PENDINGINAN BAHAN MAKANAN DALAM COOLBOX UNTUK PEMASARAN DENGAN WATER MISTING SYSTEM DI KOTA AMBON Loppies, Leslie S; Lilipaly, Eka Rahmat Mahayani Anthonio Putera
JURNAL SIMETRIK Vol 11 No 1 (2021): Jurnal Simetrik (Sipil, Mesin, Listrik)
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat (P3M) Politeknik Negeri Ambon

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/js.v11i1.620

Abstract

Food preservation can be done by using cooling system, however, the preservation used in Ambon traditional market is still the old ways of pouring cold water on the materials. The method caused many types of pollution such as smell, dirty puddle, and the damage of the road. By using a more effective and efficient cooling system, the food material is expected to be more clean, the market will be better and less damaged road. This will result in a happier customer and seller. The water misting system can keep the materials temperature at 10-15⁰C. The materials use is kale and fish. These materials can last all day and looked fresh. This system did not create pollution, dirty water puddle, and also consumed less water.
Pengaruh Deferensisasi Kotak Pendingin Bagi Penjual Ikan Sistem Delivery Pada Masa Pandemi Covid-19 Di Kota Ambon Loppies, Leslie Sovie
JURNAL SIMETRIK Vol 11 No 2 (2021): Jurnal Simetrik (Sipil, Mesin, Listrik)
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat (P3M) Politeknik Negeri Ambon

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/js.v11i2.623

Abstract

Pada masa pandemi Covid-19 di Indonesia khususnya di Kota Ambon,masyarakat dihimbau untuk menjalankan protokol kesehatan salah satunya adalah dengan menjauhi kerumunan. Pasar merupakan tempat yang ramai setiap harinya oleh karena itu dibutuhkan layanan delivery dimana setiap orang dapat membeli ikan dari pedagang keliling  langsung dari rumah tanpa harus mengunjungi pasar. Para penjual ikan sistem delivery biasanya hanyamenaruh ikan pada kotak stereofoam yang diisi es batu,hal ini dapat menyebabkan proses pembusukan ikan lebih cepat terjadi. Untukmencegah hal tersebut maka penelitian ini bertujuan untuk membuat kotak  Mendesain kotak pendingin ikan sistem delivery   berdasarkan fungsi utama yakni memuat produk ikan segar yang mampu  bertahan pada suhu rendah yaitu lebih kecil dari    5ᵒ C. Suhu ruang  penyimpanan pada uji coba pertama tanpa ikan  selama 120 menit  mencapai 11,5 °C, pada uji coba kedua 12,1 °C dan pada uji coba ketiga 15,0°C.  Perbedaan suhu tersebut disebabkan oleh perbedaan suhu lingkungan selama pelaksanaan uji coba. Suhu lingkungan pada uji coba pertama adalah 28 °C, uji coba kedua 30 °C dan uji coba ketiga 32°C.  Suhu lingkungan berpengaruh terhadap banyaknya panas yang masuk dari lingkungan menuju ruang penyimpanan ikan. Semakin tinggi suhu lingkungan menyebabkan semakin besar jumlah panas yang masuk sehingga suhu  ruang  penyimpanan yang  dapat dicapai  juga semakin  tinggi. Hal ini yang       menyebabkan  suhu  ruang   penyimpanan   pada uji coba ketiga paling tinggi.Hasil penelitian menunjukkan bahwa peti ikan berpendingin dapat mempertahankan suhu ikan di bawah 3 °C pada saat dilakukan penjualan ikan secara eceran dibandingkan pengunaan sterofoam tanpa alat pendingin. Suhu kotak pada uji coba dalam kondisi  kosong selama 120 menit mencapai 11,1 – 15,0 °C.Penambahan kipas di bagian dalam kotak insulasi dan penggunaan power supply dapat mempercepat dan memaksimalkan proses pendinginan.Kata Kunci : Kotak pendingin,ikan,suhu, peltier
Co-Authors Abdul Hamid Auliana Diah Wilujeng Dessy Natalia Renwarin Gahsar Rumaday Graciadiana. I. Huka Huka, Gracia Irene Ida Ayu Putu Sri Widnyani Josef Matheus Kristofol Waas Lekatompessy, Roy R. Lilipaly, Eka Rahmat Mahayani Anthonio Putera Lopuhaa, Agustinus Oktovianus Maitimu, Cindy Gabriel Nevada M.J. Nanulaitta Nevada. J. M. Nanulaitta Nursitna F. R. Mahmud Patty, Alexander A. Pelasula, Berthy Pellu, Denny Ismail Putirulan, Tesya Rumaday , Gahsar Waas, Kristofol