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All Journal Jurnal Teknik ITS The Journal of Experimental Life Sciences (JELS) 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 Squalen Bulletin of Marine and Fisheries Postharvest and Biotechnology Adi Widya : Jurnal Pengabdian Masyarakat IJOCE (International Journal of Offshore and Coastal Engineering) Jurnal Purifikasi Jurnal Kadesi : Jurnal Teologi dan Pendidikan Agama Kristen Jurnal Pengabdian Pada Masyarakat Sewagati
Herman Pratikno, Herman
Institut Teknologi Sepuluh Nopember
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Analysis of the Effect of Abrasive Material and Polyurethane Coating Thickness Variations on ASTM A36 Steel Towards Corrosion Rate in Sea Water Environment Herman Pratikno; Felita Widya Hapsari; Wimala Lalitya Dhanista
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 5, No 1 (2021)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i3.9953

Abstract

An unavoidable phenomenon of using steel as the main material in offshore structures and floating vessels is corrosion. One method of preventing corrosion is by coating and using polyurethane is one type of coating that is currently being developed in the maritime industry. But the success of this coating process is very dependent on the surface preparation process. The usual method used is blasting using an abrasive material. This study aims to find the response to the corrosion rate of polyurethane coating with thickness variations of 60 µm, 80 µm, and 100 µm by first blasting using abrasive material variations in the form of silica sand and steel grit. The result of the corrosion rate test showed that the lowest corrosion rate value was obtained in the variation of abrasive material in the form of steel grit. with a 100. µm of polyurethane coating thickness, that is 0,00008 mm/a. While the highest corrosion rate value was obtained in the variation of abrasive material in the form of silica sand with a 60 µm of polyurethane coating thickness, that is 0,02202 mm/a. 
Influence of Pre-Weld Heat Treatment and Aging Post-Weld Heat Treatment on Tensile Test and Microstructure of Aluminium 6061 Weld Joint Herman Pratikno; Tin Rachmatullah; Hasan Ikhwani
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.v4i1.8701

Abstract

Aluminium 6061 is an aluminium composition with Al-Mg-Si alloy which is often used for offshore structure material due to its high strength, good ductility and good corrosion resistance as well as its mechanical properties that can be enhanced by heat treatment. The purpose of this paper is to show the effect of heat treatment variations, in the form of preheating and aging PWHT, on tensile strength and microstructure of aluminium 6061 welding connection with GTAW process using electrode ER 5356. The pre-heat temperature variations used were 80°C, 100°C, and 120°C and the aging PWHT temperature variations used were 180°C and 260°c. The result shows that specimen with preheat treatment temperature of 120°C and aging pwht temperature of 260°C had the largest ultimate strength of 246.74 MPa and yield strength of 125.21 MPa. The highest percentage of Mg2Si formed was also found on the same specimen with a percentage of 48.84% in weld metal, 58.75% in HAZ, and 43.54% in base metal.
Comparative Analysis of FCAW, and GMAW Welding With Heat Input Variations on A36 Steel Against Vickers Hardness Test and Macrostructure Herman Pratikno; Nugraha Adhi Pahlawan; Wimala Lalitya Dhanista
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 5, No 2 (2021)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i4.10931

Abstract

In offshore building construction, a precise welding method is needed on A36 steel, where A36 steel is one of the main materials in the fabrication process of offshore buildings. In this study a comparison of the results of the welding GMAW and FCAW with variations of the heat input on the A36 steel to the Hardness test, and the macrostructure test and the selection of the most appropriate method based on the results of the mechanical test analysis. The heat input variations used are GMAW 1.50 kJ / mm and 2.03 kJ / mm while for FCAW 1.90 kJ / mm and 2.30 kJ / mm. The results of this study are the best hardness test results are the FCAW welding method with a heat input of 2.30 kJ / mm with an average ultimate strength of 149.06 HVN, in the macro test the results show that the greater the heat input, the wider the HAZ area, this is shown by welding FCAW heat input 2.30 kj / mm which has a HAZ width area of 20 mm.
The Effect Analysis of Coating Thickness Variation and Mixed Composition of Zinc - Graphite on Epoxy Coating with Steel Plate ASTM A36 Herman Pratikno; Andry Febrianto; 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.v4i1.8707

Abstract

Steel has an important role in the world of marine manufacturing industry. Steel for offshore buildings needs to be reviewed in terms of controlling metal corrosion. The coating method can be used in mobilization areas and splash zones of offshore buildings that have high corrosion rates due to sustained friction loads in the marine environment. This study used steel plate ASTM A36, which is a low carbon steel, and analyze its adhesion strength, abrasion resistance, and corrosion rate prediction by varying the coating thickness of 100μm, 200μm, and 300μm, with a mixture of Zinc-Graphite on epoxy coatings of 2%, 6%, and 10 %. In the Pull-Off test the highest value of adhesion strength was obtained at a mixture of 2% and coating thickness of 100μm with a value of 8.73 Mpa. In the highest abrasion test values was obtained with a variation of 10% mixture and coating thickness of 300μm with a value of 0.91 Wear Cyces per Micrometer. Whereas in the three-cell electrode test the highest value was at a 100% mixture variation and coating thickness of 300μm with a value of 0,00010 mmpy.
The Effect Analysis of Coating Thickness Variation and Mixture Composition of Magnesium – Flake Glass on Epoxy Coating on Abrasive Resistance, Adhesion Strength, and Prediction of Corrosion Rate of ASTM A36 Steel Plate Herman Pratikno; Yudiardana Tridantoko Susarno; Hasan Ikhwani
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.v4i2.9339

Abstract

Steel cannot be separated from the marine manufacturing industry. It is important to control the corrosion rate of steel used for offshore structures. The coating method can be used in mobilization areas and splash zones that have high corrosion rates due to sustained friction loads in the marine environment. The purpose of this study was to analyze the different in adhesion strength, abrasion resistance, and corrosion rate prediction of ASTM A36 low carbon steel plate with coating thickness variations of 300µm, 500µm, and 700µm and Magnesium Carbonate - Flake Glass mixture variations of 10%, 20%, and 30%. In the pull-off test, the highest value of adhesion strength was obtained from specimen with 300µm coating thickness and 10% Magnesium Carbonate - Flake Glass mixture with a value of 5.67 Mpa. The highest abrasion test value was obtained from specimen with 700µm coating thickness and 30% Magnesium Carbonate - Flake Glass mixture with a value of 0.91 Wear Cyces per Micrometer. Whereas in the three cells electrode test, the highest value was found at specimen with 700µm coating thickness and 30% Magnesium Carbonate - Flake Glass mixture with a value of 0,00010 mmpy.
Effect of Heat Treatment and Types of Bacteria on Corrosion Resistance At Steel Materials (API 5L and ASTM A53) in the Marine Environment Herman Pratikno; Harmin Sulistyaning Titah; Febrian Ramadhana Sastradimaja
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 1, No 1 (2017)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (852.27 KB) | DOI: 10.12962/j2580-0914.v1i1.2876

Abstract

Corrosion is the result of damage to material degradation through a chemical or electrochemical reaction spontaneously and causes a decrease in the quality of the material. One of the causes of corrosion is the presence of bacteria on the material. The danger posed by corrosion is fatality, especially on offshore platforms, namely cessation of production at offshore rigs. This study is an experiment using material carbon steel API 5L Grade B and ASTM A53 commonly used as a base for the manufacture of subsea pipelines. Material to be heat-treated before immersion for corrosion test in artificial seawater (salinity 35‰), which have been added with bacteria and without bacteria. The method used in measuring the rate of corrosion steel data is the weight loss. The highest corrosion rate of the original material ASTM A53 and API 5L with the addition of T. ferrooxidans bacteria are, respectively, 3.63 mpy and 3.50 mpy. While the lowest corrosion rate of ASTM A53 and API 5L both with heat treatment but without adding bacteria are 2.33 mpy and 2.01 mpy. This indicates that the steel API 5L have high levels of corrosion resistance, better than ASTM A53 in the marine environment with bacteria or without bacteria.
The Effect Analysis of Coating Thickness Variation and Mixture Composition of Magnesium – Flake Glass on Epoxy Coating on Abrasive Resistance, Adhesion Strength, and Prediction of Corrosion Rate of ASTM A36 Steel Plate Herman Pratikno; Yudiardana Tridantoko Susarno; Hasan Ikhwani
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 5, No 1 (2021)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i3.9956

Abstract

Steel cannot be separated from the marine manufacturing industry. It is important to control the corrosion rate of steel used for offshore structures. The coating method can be used in mobilization areas and splash zones that have high corrosion rates due to sustained friction loads in the marine environment. The purpose of this study was to analyze the different in adhesion strength, abrasion resistance, and corrosion rate prediction of ASTM A36 low carbon steel plate with coating thickness variations of 300µm, 500µm, and 700µm and Magnesium Carbonate - Flake Glass mixture variations of 10%, 20%, and 30%. In the pull-off test, the highest value of adhesion strength was obtained from specimen with 300µm coating thickness and 10% Magnesium Carbonate - Flake Glass mixture with a value of 5.67 Mpa. The highest abrasion test value was obtained from specimen with 700µm coating thickness and 30% Magnesium Carbonate - Flake Glass mixture with a value of 0.91 Wear Cyces per Micrometer. Whereas in the three cells electrode test, the highest value was found at specimen with 700µm coating thickness and 30% Magnesium Carbonate - Flake Glass mixture with a value of 0,00010 mmpy.
Analitical Study of Vertical and Lateral Buckling on Pipeline Using Hobbs Method Yoyok Setyo Hadiwidodo; Muhammad Makki Romadhoni; Herman Pratikno
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 1, No 2 (2017)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (894.413 KB) | DOI: 10.12962/j2580-0914.v1i2.7058

Abstract

During its operation, the pipeline will receive loads of internal pressure and thermal loads of fluid flowed until the pipes have both vertical and lateral buckling. Numerical analysis of vertical and lateral buckling Hobbs this method on a high friction coefficient and the coefficient of friction (0.3 ≤ φ ≤ 0.7) as well as the length of buckling as many as 20 variants were then performed comparisons, as well as axial tension comparison with DnV RP L110. So we get the relationship of temperature increase with the length and amplitude buckling. The data which is used is the gas pipeline Labuhan Maringgai-Muara Bekasi PT. Perusahaan Gas Negara (Persero) Tbk., Including the outer diameter of the pipe = 0.8128 m, plate thickness = 0.015875 m, thermal linear expansion coefficient = 11 x 10-6 m / oC, etc. So the higher coefficient of friction, temperature rise of 13.4%, 13.4% reduced buckling length, and axial tension increased to 12.95%. For the comparisons, the coefficient of friction does not affect the length of buckling on the vertical buckling. Comparison with DnV RP F110, increased coefficient of friction will increase the voltage axial (Seff) of 0.00024% and up 13.4% axial stress (P0) Hobbs.
Effect Analysis on Coating Methods and Corrosive Media Variations toward Adhesion Strength, Corrosion Rate, and Metallography of ASTM A36 Steel with Polyurethane Coating Herman Pratikno; Inaya Krista Pradyptia; Hasan Ikhwani
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 5, No 2 (2021)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i4.10933

Abstract

Corrosion can cause material damage due to the material’s reaction with the environment. Corrosion will affect materials on construction, including metal material, thereby reducing the strength and the construction life, especially in a corrosive environment. The most effective and economical corrosion control is coating. The right coating application method will result in good bonding of the paint with the material, so that the corrosion protection will be better. This research used the ASTM A36 carbon steel material and polyurethane coatings. The purpose of this study is to determine the adhesion strength and corrosion rate by varying the application methods, namely brush, roll, and spray. In the pull-off test, the highest value of adhesion strength was obtained in the spray coating method with an average value of 20,82 MPa. Whereas in the three-electrode cell testing, the lowest corrosion rate using NaCl corrosive media was found in the spray coating method with a value of 0.000025402 mmpy and the lowest corrosion rate using FeCl3 corrosive media was found in the spray coating method with a value of 0.00182 mmpy.
PENGARUH BAKTERI DALAM PENCEMARAN LIMBAH TERHADAP KOROSI PADA STRUKTUR BAJA DI LINGKUNGAN LAUT Herman Pratikno
Purifikasi Vol 8 No 1 (2007): Jurnal Purifikasi
Publisher : Department of Environmental Engineering-Faculty of Civil, Environmental and Geo Engineering. Institut Teknologi Sepuluh Nopember, Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25983806.v8.i1.105

Abstract

Corrosion is the phenomena on the offshore structures which is impossible to avoid. Corrosion is occurred by physical, chemical and biological process. Generally, biological corrosion is caused by presence of microbes which on its process can be individual or make a new colony with other bacteria. Ocean outfall usually produce some bacteria which having role in corrosion process. With artificial sea water media and the corrosion rate calculation based on ASTM standard, has been compare the corrosion rate of the specimen on 3 sea water condition, consist of deep sea water (salinity 33‰), medium sea water (salinity 35‰), shallow sea water (salinity 37‰) and variate into 3 kinds bacteria as follows: Escherichia coli, Pseudomonas fluorescens, and Thiobacillus ferroxidans The result of this analysis show that maximum corrosion rate is 1,321 mm/year or increase 89,79% from the normal condition without adding bacteria, with value 0,696 mm/year.
Co-Authors 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 Dienullah, R Mohammad Alghaf Dirta Marina Chamelia Dwa Desa Warnana Dwi Purnomo H, Zuhud Ubaidillah & Miftakh D.S Febrian Ramadhana Sastradimaja Felita Widya Hapsari Frestiqauli, Santi Gilang Rezha Mahardika Hafizh Abiyyuda Handaningtyas, Inggrid Handayanu Handayanu Handayanu Handayanu Harmin Sulistyaning Titah Harmin Sulistyaning Titah Hasan Ikhwani Hasan Ikhwani Hasan Ikhwani Hasan Ikhwani Ikhwani, Hasan Inastika Nabilah Inaya Krista Pradyptia Ipung Fitri Purwanti Kusumaningrum, Ajeng Wardhani Lila Yuwana 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 Sultanul Azdkar Muhammad Zikra Mukhtasor Mukhtasor Nabila, Debby Dea Naifah, Sonia Ratnaduhita Nurani Nugraha Adhi Pahlawan Nur Syahroni Pandu Damay Putra Pratikto, Agoes Putera, Rizky Islami Putra, Riyan Afnanda Rahmadhani Tasya Rahman Rahmaningtyas, Ivana Rashida, Ailsa Dahayu 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 SALMAN FARIS Shade Rahmawati Sholihin Sholihin Sholihin Suef, Mokhammad Suparno Suparno SUTIKNO Taufik Fajar Nugroho Tin Rachmatullah Tin Rachmatullah Titah, Harmin Sulistiyaning Titah, Harmin Sulistiyaning Wardhani, Widhowati Kesoema Wimala Lalitya Dhanista Wimala Lalitya Dhanista Wimala Lalitya Dhanistha Wiscahyo, Gelar Wisnu Wardhana Yani, Beta Fitri Yoyok Setyo H Yoyok Setyo Hadiwidodo Yoyok Setyo Hadiwidodo Yudha Prasetyawan Yudha Prasetyawan Yudiardana Tridantoko Susarno