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All Journal Jurnal Teknik ITS IPTEK Journal of Proceedings Series IPTEK The Journal for Technology and Science Journal of Engineering and Technological Sciences International Conference on Coastal and Delta Areas Adi Widya : Jurnal Pengabdian Masyarakat IJOCE (International Journal of Offshore and Coastal Engineering) Jurnal Purifikasi International Journal of Marine Engineering Innovation and Research Jurnal Kadesi : Jurnal Teologi dan Pendidikan Agama Kristen Jurnal Pengabdian Pada Masyarakat Sewagati
Herman Pratikno, Herman
Institut Teknologi Sepuluh Nopember
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Analisis Ketahanan Microalga pada Material Baja AH 36 dengan Menggunakan Metode Impressed Current Anti Fouling (ICAF) Gilang Rezha Mahardika; Herman Pratikno
Jurnal Teknik ITS Vol 7, No 2 (2018)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (330.191 KB) | DOI: 10.12962/j23373539.v7i2.35134

Abstract

Biofouling merupakan salah satu penyebab korosi yang tidak dapat dihindarkan lagi khusunya pada daerah yang terkena lingkungan (air dan udara) secara langsung. Penyebab dari fouling ini juga bermacam-macam dan dibedakan menjadi 2 jenis yaitu macrofouling dan microfouling. Macrofouling contohnya kerang, jamur dan sebagainya. Sedangkan microfouling contohnya bakteri, alga, dan sebagainya yang mana keduanya sama-sama menjadi penyebab utama korosi . Maka pada penelitian kali ini akan diuji ketahanan fouling yang diakibatkan oleh mikroalga pada umumnya terjadi pada sistem pendingin kapal dan sistem ballasting menggunakan metode Impressed Current Anti Fouling (ICAF). Objek yang digunakan pada penelitian kali ini adalah 2 mikroalga jenis Chlorella vulgaris dan Spirulina platensis yang pada kasus di lapangannya kedua mikroalga ini sering menjadi penghambat masuknya air laut kedalam sistem pendingin kapal dan menyebabkan korosi pada logam didalamnya. Penelitian kali ini menggunakan air laut komersil yang sudah di filter yang memiliki salinitas sebesar 35 ppt dan menumbuhkan kedua mikroalga tersebut selama 10 hari. Pada penelitian kali ini digunakan variasi arus listrik dan waktu yaitu 0.3, 0.5 dan 1 A untuk arus listrik nya dan 5, 7 dan 10 menit untuk waktu nya yang mana setelah reaktor ICAF diaktifkan katoda yang berupa baja HSLA 36 dan anoda yang berupa tembaga dimasukan kedalam wadah yang sudah terisi oleh mikroalga aktif. Hasil eksperimen ICAF dengan mikroalga menunjukan bahwa reaktor sederhana yang menggunakan sistem ICAF ini berhasil membunuh mikroalga chlorella vulgaris dengan persentase tertinggi sebesar 99.98% untuk arus 1 A waktu 10 menit terkecil 97.57% untuk arus 0.3 A waktu 5 menit, sedangkan untuk spirulina platensis persentase tertinggi sebesar 99.17% untuk arus 1 A waktu 10 menit terkecil 77.50% untuk arus 0.3 A waktu 5 menit. Maka dari itu semakin besar arus dan lama waktunya maka semakin efektif pula pemakaian dari sistem ICAF tersebut.
Analisis Sour Corrosion pada Baja ASTM A36 Akibat Pengaruh Asam Sulfat dengan Variasi Temperatur dan Waktu Perendaman di Lingkungan Laut Ray Adam Baihaqi; Herman Pratikno; Yoyok Setyo Hadiwidodo
Jurnal Teknik ITS Vol 8, No 2 (2019)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (368.281 KB) | DOI: 10.12962/j23373539.v8i2.45896

Abstract

Pada industri maritim masalah korosi merupakan masalah yang serius yang terjadi pada logam karena bisa mengurangi nilai ekonomis dari logam tersebut. Logam yang paling banyak digunakan pada industri maritim adalah Baja ASTM A36 yang merupakan baja karbon rendah dengan kandungan karbon 0,25% sampai 0,29%. Tujuan penelitian ini untuk mengetahui variasi medium perendaman, temperatur dan waktu perendaman terhadap laju korosi Baja ASTM A36. Pada medium perendaman menggunakan dua variasi yaitu medium NaCl 3,5% yang merupakan medium air laut buatan dan medium NaCl 3,5% + H2SO4 0,5 M. Kemudian untuk variasi temperatur adalah 20˚, 30˚, 40˚ C. Dan variasi waktu perendaman yang digunakan 24, 72, 120 dan 168 jam. Hasil dari uji immersion corrosion test menunjukkan nilai laju korosi tertinggi terjadi pada Baja ASTM A36 yang direndam pada medium NaCl 3,5% + H2SO4 0,5 M dengan temperatur perendaman 40˚ C yang menunjukkan nilai laju korosi 37,584 mmpy (24 jam), 31,965 mmpy (72 jam), 23,795 mmpy (120 jam), 19,375 mmpy (168 jam), kemudian pada material sampel uji tersebut terjadi korosi seragam dan korosi batas butir. Nilai laju korosi tertinggi pada medium perendaman NaCl 3,5% terjadi pada Baja ASTM A36 yang direndam pada temperatur 40˚ C yang menunjukkan nilai laju korosi 0,098 mmpy (24 jam), 0,105 mmpy (72 jam), 0,081 mmpy (120 jam), 0,063 mmpy (168 jam), kemudian pada material sampel uji tersebut terjadi korosi seragam dan korosi sumuran. Hasil penelitian ini didapatkan adanya senyawa H2SO4 dan temperatur yang tinggi dapat mempercepat laju korosi di lingkungan laut.
Analisis Pengaruh Variasi Heat Input Pengelasan FCAW pada Sambungan Baja BKI Grade A terhadap Sifat Mekanik Muhammad Ichsan Rosidin Yuniarto; Herman Pratikno; Dirta Marina Chamelia
Jurnal Teknik ITS Vol 8, No 2 (2019)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (169.761 KB) | DOI: 10.12962/j23373539.v8i2.47184

Abstract

Kegiatan eksplorasi minyak dan gas di laut membutuhkan fasilitas anjungan lepas pantai khususnya berupa struktur terapung, karena dapat berpindah tempat sesuai kebutuhan. Salah satu rangkaian pekerjaan untuk memproduksi struktur lepas pantai tersebut adalah proses pengelasan. Flux Cored Arc Welding (FCAW) merupakan proses pengelasan yang cocok untuk kegiatan fabrikasi karena memiliki tingkat produktivitas yang tinggi. Tujuan penelitian ini adalah untuk mengetahui pengaruh variasi heat input terhadap kekuatan tarik dan pengamatan struktur makro-mikro pada pengelasan baja BKI Grade A dengan metode pengelasan FCAW. Variasi heat input yang digunakan pada penelitian ini adalah 1,19 KJ/mm, 1,32 KJ/mm, dan 1,46 KJ/mm. Pada hasil pengujian tarik, pengelasan dengan heat input 1,46 KJ/mm memiliki nilai kekuatan tarik terbesar, ultimate strength 453,85 MPa dan yield strength 349,76 MPa. Lebar daerah HAZ tiap spesimen tidak jauh berbeda, adapun pengelasan dengan heat input 1,46 KJ/mm memiliki daerah HAZ terlebar yaitu 18 mm. Sedangkan pada hasil pengamatan struktur mikro, pengelasan dengan menggunakan heat input 1,46 KJ/mm pada bagian weld metal memiliki presentase struktur ferrite paling kecil yaitu 61,1%, kemudian struktur pearlite 38,9%.
Analisa Pengaruh Variasi Pre-Weld Heat Treatment dan Aging Post Weld Heat Treatment pada Sambungan Las Alumunium 6061 terhadap Kekuatan Tarik dan Struktur Makro Tin Rachmatullah; Herman Pratikno; Hasan Ikhwani
Jurnal Teknik ITS Vol 9, No 2 (2020)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23373539.v9i2.53199

Abstract

Alumunium 6061 merupakan alumunium dengan komposisi paduan Al-Mg-Si sebagai paduan utama yang sering digunakan untuk material struktur lepas pantai dikarenakan kekuatan yang tinggi, ductility baik dan ketahanan korosi yang baik juga sifat mekanisnya ditingkatkan dengan cara heat treatment. Tujuan dari paper ini adalah untuk menunjukkan bagaimana pengaruh variasi perlakuan heat treatment berupa preheating dan aging post weld heat treatment pada sambungan las alumunium 6061 dengan proses GTAW terhadap kekuatan tarik dan struktur mikro dengan elektroda ER 5356. Adapun variasi suhu preheat adalah 80℃, 100℃, dan 120℃ dan variasi suhu aging post weld heat treatment 180℃ dan 260℃. Hasil penelitian didapatkan spesimen dengan perlakuan preheat 120℃ dan aging post weld heat treatment 260℃ memiliki ultimate strength terbesar yaitu 246,74 MPa dan yield strength sebesar 125,21 MPa. Serta HAZ terpanjang dimiliki spesimen perlakuan preheat 120℃ dan aging PWHT 260℃ dengan lebar HAZ sepanjang 3,5 mm.
Isolation and Screening of Diesel Degrading Bacteria from Ship Dismantling Facility at Tanjungjati, Madura, Indonesia Harmin Sulistiyaning Titah; Herman Pratikno; Atiek Moesriati; Muhammad Fauzul Imron; Rizky Islami Putera
Journal of Engineering and Technological Sciences Vol. 50 No. 1 (2018)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2018.50.1.7

Abstract

The ship dismantling industry is a cause of contamination of the environment by diesel. The objectives of this study were to isolate and screen diesel degrading bacteria from diesel contaminated areas. Diesel contaminated seawater and soil samples were collected from a ship dismantling facility at Tanjungjati, Madura, Indonesia. Isolation was conducted with an aseptic technique and growing the mixture culture was carried out based on the pour plate method. After 24 h of incubation, thirteen bacteria strains were isolated from diesel contaminated seawater and soil samples from the area of study. The isolated bacteria were identified based on morphological characterization. Mostly gram positive bacteria were found. The isolated bacteria were screened by using nutrient agar medium containing various diesel concentrations (0%, 5%, 10%, and 15% (v/v)). The result of the screening test showed that the bacteria coded EL and CT displayed the best resistance and highest growth in diesel polluted medium. It was shown that both of them potentially have a higher capability of utilizing diesel as carbon and energy source than the others.
Identification of Diesel Resistant Bacteria that Isolated from Ship Dismantling Area in Madura Coastal Harmin Sulistyaning Titah; Herman Pratikno; Atiek Moesriati; Rizky Islami Putera; Muhammad Fauzul Imron
International Conference on Coastal and Delta Areas Vol 3 (2017): The 3rd International Conference on Coastal and Delta Areas
Publisher : International Conference on Coastal and Delta Areas

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Ship dismantling activity is one industry that caused diesel contamination in environment. One of technology that can be used to remediate diesel contaminated area is bioremediation. Bioremediation can be conducted using bioaugmentation technique. The objective of this study was to identifity of diesel resistant bacteria using biochemicals test methods. The seawater and coastal soil samples were collected from area study using a sterilized bottles. All samples were shaker at 150 rpm for 1 h, after that samples were taken and serially diluted from 10-1 to 10-7. The diluted sample was inoculated on nutrient agar plates by pour plate method. The plate was incubated for about 24-48 hours and the growth of microorganisms was noted. Bacteria with difference of colony morphologies were selected. The cell morphology was determined microscopically after Gram-stain preparation. The isolates were identified using Microbact GNB 12A and 12B (Oxoid, UK) identification kit. This is a miniaturized computer aided identification system for the identification of organisms belonging to the genus Acinetobacter and Vibrio. Keywords: bacteria, bioremediation, coastal, seawater, ship dismantling
The ability of Avicennia marina (Api-api putih) to Uptake Heavy Metal of Chromium at Wonorejo Coastal in Surabaya Herman Pratikno; Harmin Sulistyaning Titah; Handayanu Handayanu; Bintang Respati Dwi Harnani
International Conference on Coastal and Delta Areas Vol 3 (2017): The 3rd International Conference on Coastal and Delta Areas
Publisher : International Conference on Coastal and Delta Areas

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The increasing of industries and population growth are the main sources of contamination in the river. Wonorejo river is one of rivers in Surabaya that flow to east coast Surabaya. Concentration of Chromium (Cr) at estuary of Wonorejo River was 0.0325 mg/L and it was 2.7761 mg/L in sediment in 2007. Meanwhile, Cr at east coast of Wonorejo was 0.418 μg/L, it was indicating that upper than standart for biota in sea, 0.005 μg/L (KepMenLH No. 51 tahun 2004). In this research will be measured concentration of Cr from sediment and roots of Avicennia marina at Wonorejo River estuary. And then, it was calculated Bio-consentration Factor (BCF) value of A. marina. Transect method was used to determine the sampling point of mangrove root A. marina and sediment at estuary of Wonorejo River. Mangrove and sediment roots were analyzed using the Atomic Absorption Spectrophotometer (AAS) method, previously samples of roots and sediments were extracted using the wet destruction method. Parameters supporting in this research were measured include temperature using thermometer, salinity using salinometer and pH using pH meter for sediment. Based on the results, the average concentration of Cr in the sediment in transect 1 were 47 mg/kg until to 66.5 mg/kg. The concentration of Cr in roots of A. marina were 28 mg/kg until to 92.25 mg/kg. The BCF value in A. marina were 0.89 to 1.35. Based on the BCF value, it indicated that A. marina was a hyperacumulator species for heavy metals of Cr. Keywords: Avicennia marina, BCF, coast, chromium, root, sediment
Bio-corrosion on Aluminium 6063 by Escherichia coli in Marine Environment Herman Pratikno; Harmin Sulistiyaning Titah
IPTEK The Journal for Technology and Science Vol 28, No 2 (2017)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (702.637 KB) | DOI: 10.12962/j20882033.v28i2.2927

Abstract

Biological corrosion is caused by presence of microbes in environment. Escherichia coli causes serious biofouling in various environments and its pronounced influence on marine biofouling that causing serious problems such as accelerated corrosion. E. coli shares similar properties with most marine bacteria and it was extensively studied for marine environment. The aims of this research was to determine the corrosion rate on Aluminium 6063 by E. coli in deep seawater (salinity of 33‰), medium seawater (salinity of 35‰), shallow seawater (salinity of 37‰). Based on results, bio-corrosion rate on Al 6063 were higher than control. The bio-corrosion rate Al 6063 at day 28 in salinity of 37‰ was 1.1233 mm/year, meanwhile the corrosion rate for control was 0.7225 mm/year. Visual observation showed that corrosion occured on surface on specimen. Macrostructure observation showed that white spots occured on surface of specimen with E. coli was higher than specimen in control (without E. coli, only saline water) It was indicating that presence of E. coli caused increasing of corrosion rate on Al 6063.
Analysis of Influence of Abrasive Material Variation and Spray Pressure Variation in Coating Epoxy of Astm A36 Steel Toward Impact Resistance and Corrosion Rate Herman Pratikno; Bima Satriya Willy Harsa; Sholihin Sholihin
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 4, No 2 (2020)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i2.9337

Abstract

Corrosion is a decrease in material quality caused by environmental influences. One of the methods commonly used to control corrosion is coating. In the coating process, the use of spray is the better method compared to roll and brush. Before coating is applied, the choice of abrasive material during the sand blasting process can determine the success of the coating. This research was conducted to analyze the effect of variations in abrasive material and spray pressure on the coating process of ASTM A36 steel material on its impact resistance, corrosion rate, and adhesion forces. Variation of abrasive material used were steel grit and silica. The spray pressure variations used were 2.5, 3.5, and 4.5 bar. The result of corrosion rate testing on variation with steel grit abrasive material and spray pressure of 4.5 bar has the lowest corrosion rate, with the value of 0.00124 mm/a. The highest adhesion strength test result of 9.07 MPa was obtained from variations with steel grit abrasive material and spray pressure of 4.5 bar. Impact test result using a variation with steel grit abrasive materials and a spray pressure of 4.5 bar yield the highest value, with the value of 2.287 joules.
Analyzing the Effect of Variation in Shielding Gas Flow Rate and V Groove Type Towards Tensile and Metallographic Testing of GMAW Weld Joint of ASTM A53 and A36 Herman Pratikno; Andrea Novia Samiyono; Wimala Lalitya Dhanistha
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 4, No 1 (2020)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i1.8706

Abstract

Steel is a metal that commonly used in fabrication, engineering, and reparation activities in the structure construction industry. ASTM A53 steel is a low carbon steel with 0.25% to 0.3% of carbon content so it has a high weldability. ASTM A36 steel is a low carbon steel with carbon content of 0.25% to 0.29% and is often used in the floating building industry. This study aims to determine the effect of shielding gas flow rate and V-groove type to the tensile strength of A53 steel welded with A36 steel by Gas Metal Arc Welding (GMAW) method. The shielding gas level used is 100% CO2 with flow rate variations, including 15 liters/minute, 20 liters/minute, and 25 liters/minute. The groove types used are Single V-Groove and Double V-Groove. Tensile strength test result showed that in the welding process in this study, specimen with 25 liters/minute flow rate on the Double V-Groove had the highest tensile strength value of 516.73 MPa, with the narrowest HAZ width of 0,87 mm on A36’s HAZ and 1,22 mm on A53’s HAZ, and the smallest percentage of ferrite in the microstructure as much as 56.34% and 43.66% pearlite.
Co-Authors Abdullah Husin Baredwan Agung Purniawan Andrea Novia Samiyono Andry Febrianto Ardi Prasetia Yanuar Arifin Amanto Putra Atha Fazadima Atiek Moesriati Atiek Moesriati Bayu Mahardika Bima Satriya Willy Harsa Bintang Respati Dwi Harnani Carolus Trijatmiko Nugroho Dirta Marina Chamelia Dwi Maharani Aisyah Dwi Purnomo H, Zuhud Ubaidillah & Miftakh D.S Faruq Abdullah Febrian Ramadhana Sastradimaja Felita Widya Hapsari Gilang Rezha Mahardika Hafizh Abiyyuda Hafizh Abiyyuda Handayanu Handayanu Handayanu Handayanu Harmin Sulistyaning Titah Harmin Sulistyaning Titah Hasan Ikhwani Hasan Ikhwani Hasan Ikhwani Hasan Ikhwani Hasan Ikhwani Inastika Nabilah Inaya Krista Pradyptia Madi Madi Madi Mahmud Mustain Mahmud Mustain Maria Anityasari Miftakh D.S, Dwi Purnomo H, Zuhud Ubaidillah & Moch. Zaed Yuliadi Muhammad Fauzul Imron Muhammad Ichsan Rosidin Yuniarto Muhammad Makki Romadhoni muhammad Rizkqy Jafa Muhammad Rizqy Jafa Muhammad Sultanul Azdkar Nugraha Adhi Pahlawan Nur Syahroni Pandu Damay Putra Putera, Rizky Islami Rahmadhani Tasya Rahman Ray Adam Baihaqi Raymond Habinsaran Aruan Rizkiyah Ramadani Rizky Islami Putera Rizky Islami Putera Rochani, Imam Rudi Walujo Prastianto Rudi Walujo Prastianto Safira Dwi Anggraeni Sholihin Sholihin Sholihin Sujantoko Sujantoko Suparno Suparno Taufik Fajar Nugroho Tin Rachmatullah Tin Rachmatullah Titah, Harmin Sulistiyaning Totok Yulianto Wimala Lalitya Dhanista Wimala Lalitya Dhanista Wimala Lalitya Dhanistha Yoyok Setyo H Yoyok Setyo Hadiwidodo Yoyok Setyo Hadiwidodo Yoyok Setyo Hadiwidodo Yudha Prasetyawan Yudiardana Tridantoko Susarno