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Digital twin for subsea pipeline corrosion monitoring location based on ILI-MFL pipeline operator forum and potentiodynamic test

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AIP Conference Proceedings 2024年第1期3076卷

作者： Ekha Panji Syuryana Muhammad Agus Kariem I. G. N. Wiratmaja Puja M. Irvan Maulana Uriyana Rizki Agus Doctoral Study Program Faculty of Mechanical and Aerospace Engineering Bandung Institute of Technology Bandung Indonesia Faculty of Mechanical and Aerospace Engineering Bandung Institute of Technology Bandung Indonesia Faculty of Industrial Technology Pertamina University Jakarta Indonesia Master Study Program Faculty of Mechanical and Aerospace Engineering Bandung Institute of Technology Bandung Indonesia PT Dago Energi Nusantara Bandung Indonesia

The limitation of subsea pipeline access coupled with limited personnel mobilization due to the COVID-19 pandemic has become a challenge in pipeline inspections. With these limitations, this study’s Inspection Data Management System (IDMS) was carried out by processing data from In Line Inspection-Magnetic Flux Leakage (ILI-MFL) to be developed into digital twin data initiation by simulating anomalies that occur using a potentiodynamic test. The analysis was carried out using the Pipeline Operator Forum (POF) diagram to map the corrosion morphology of the pipeline. Sampling is carried out using pipeline material API 5L-X42 which will form a certain corrosion morphology that represents pinhole, pitting, and general corrosion which is adjusted to the anomalies feature and metal loss depth from pipe tally in the form of length, width, and depth percent of the anomaly to the nominal wall thickness. Potentiodynamic testing was carried out using corrtest instrument 5.0, resulting in tafel polarization to define Resistance of polarization using a stern geary approach. The results are then analyzed to determine the material in resisting damage which shows corrosion rate (for general) and pitting rate (for pitting and pinhole) which is <0.02 mmpy for outstanding, 0.02-0.1 mmpy for excellent, 0.1-0.5 mmpy for good and 0.5-1 mmpy for fair. This digital twin method combined ILI MFL and Potentiodynamic testing to result in the type of anomalies, metal loss depth, dimension of anomalies from the results of the POF diagram, and determination of corrosion rate and pitting rate of API 5L-X42 material in the subsea pipeline.

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Design and efficiency optimization of deep drawing for sustainable electric pole cap application

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Materials Today: Proceedings 2023年

作者： Lydia Anggraini Fikri Aulia Mechanical Engineering Study Program President University Jababeka Education Park Cikarang Bekasi 17550 Indonesia

Deep drawing is one of the most frequently used plate-forming methods. This process forms materials by a cold working system. Like other press tool processes, the deep drawing process is also assisted by press tools, press machines, and other components that are tailored to accommodate the desired product being produced. Electric pole products consist of several pipes and a cover in the form of a semicircular plate of a certain size which is then assembled using electric arc welding. This part of the electric pole cover is made using deep drawing and blanking processes. Making products using the deep drawing method must be done with proper analysis and planning. For this reason, the dimensions of the product, the type of material, and the required strength need to be determined. The electric pole cover is made using ST37 material which is equivalent to AISI 1045 with a thickness of 2 mm and a tensile strength of 370 N/mm 2 .

关键词： Design Deep drawing Blanking Electrical Pipe

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Low-symmetry vacancy-related spin qubit in hexagonal boron nitride

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npj Computational Materials 2024年第1期10卷 1318-1326页

作者： Rohit Babar Gergely Barcza Anton Pershin Hyoju Park Oscar Bulancea Lindvall GergőThiering Örs Legeza Jamie H.Warner Igor A.Abrikosov Adam Gali Viktor Ivády HUN-REN Wigner Research Centre for Physics PO Box 49H-1525 BudapestHungary MTA-ELTE Lendület“Momentum”NewQubit Research Group Pázmány PéterSétány 1/A1117 BudapestHungary Department of Atomic Physics Insitute of PhysicsBudapest University of Technology and EconomicsMűegyetem rakpart 3.H-1111 BudapestHungary Walker Department of Mechanical Engineering and Materials Graduate Program Texas Materials InstituteThe University of Texas at AustinAustinTX78712USA Department of Physics Chemistry and BiologyLinköping UniversitySE-58183 LinköpingSweden Institute for Advanced Study Technical University of MunichLichtenbergstrasse 2a85748 GarchingGermany MTA-WFK Lendület“Momentum”Semiconductor Nanostructures Research Group PO Box 49H-1525 BudapestHungary Department of Physics of Complex Systems Eötvös Loránd UniversityEgyetem tér 1-3H-1053 BudapestHungary

Point defect qubits in semiconductors have demonstrated their outstanding capabilities for high spatial resolution sensing generating broad multidisciplinary *** boron nitride(hBN)hosting point defect qubits have recently opened up new horizons for quantum sensing by implementing sensing *** sensitivity of point defect sensors in hBN is currently limited by the linewidth of the magnetic resonance signal,which is broadened due to strong hyperfine couplings.

关键词： boron defect hexagonal

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Primary air coal supply speed analysis to prevent refractory furnace abrasion using CFD method at Tenayan steam power plant

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AIP Conference Proceedings 2023年第1期2592卷

作者： Ridwan Abdurrahman Mae Nitto Budi Karsono Abrar Ridwan Lega Putri Utami Mechanical Engineering Study Program Riau University Pekanbaru 28293 Indonesia PT. Pembangkitan Jawa–Bali PLTU Tenayan Raya Pekanbaru 28285 Indonesia Mechanical Engineering Department Universitas Muhammadiyah Riau Pekanbaru 28294 Indonesia Mechanical Engineering Study Program Andalas University Padang 25175 Indonesia

This study aims to analyze the occurrence of abrasion in the Refractory Furnace in the Coal Supply Unit 1 area at Tenayan Steam Power Plant. This analysis uses the CFD (Computational Fluid Dynamic) method. The test carried out is to determine the amount of velocity which has a direct impact on the Refractory Furnace abrasion. The results of the analysis show that refractory abrasion occurs due to the insufficient angle of the primary air coal supply so that a design modification must be made to obtain a lower velocity.

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Techno-Economic Analysis of Bioethanol Production from Sugarcane Bagasse in Indonesia

SSRN

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SSRN 2023年

作者： Aditiya, H.B. Riayatsyah, Teuku Meurah Indra Chitra, I.S.N. Ong, Hwai Chyuan Silitonga, A.S. Mahlia, T.M. Indra Department of Mechanical Engineering Faculty of Engineering Sampoerna University Jakarta Indonesia Sampoerna University Energy Research Center Pancoran Jakarta Selatan12780 Indonesia School of Civil & Environmental Engineering University of Technology Sydney 81 Broadway UltimoNSW2007 Australia Department of Mechanical Engineering National Yunlin University of Science and Technology Touliu Yunlin64002 Taiwan Program Study of Mechanical Engineering Department of Production and Industrial Technology Institut Teknologi Sumatera South Lampung 3536 Indonesia Future Technology Research Center College of Engineering National Yunlin University of Science and Technology Douliou Yunlin64002 Taiwan Centre for Technology in Water and Wastewater School of Civil and Environmental Engineering Faculty of Engineering and Information Technology University of Technology SydneyNSW2007 Australia Center of Renewable Energy Department of Mechanical Engineering Politeknik Negeri Medan Medan20155 Indonesia

The studies of bioethanol production are being intensively explored over the past years in the provision of biofuel. This has been long recognized as the best alternative for a renewable energy resource to overcome the problem of the depletion of fossil resources. Indonesia's main agricultural sector, sugarcane industry, has shown promise in supplying sugarcane bagasse (SCB) as a feedstock for the second generation of bioethanol production. In this study, the techno-economic analysis of the sugarcane bagasse from the bioethanol production plant was explored, and the viability of bioethanol production based on the biomass generated from a local sugarcane factory was evaluated. All the costs that will be incurred during a 20-year operating period for a 203 ktons bioethanol production plant from SCB is $231 million, with a payback period of 6.19 years. The potential amount of bioethanol produced from SCB of this plant is 30.19 ML/year with the production cost (levelized cost of bioethanol, LCOB) of $0.59 per liter of ethanol produced. Overall, SCB bioethanol still carries better competitiveness at lower selling price in comparison with the latest price regulation by the Indonesian government ($0.85/L). © 2023, The Authors. All rights reserved.

关键词： Life cycle

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Fracture Zone Analysis Based on Property Electrical Borehole Image Log and Geomechanic Geothermal Field Solok, West Sumatra 1

Fracture Zone Analysis Based on Property Electrical Borehole...

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1st Workshop on Environmental Science, Society, and Technology, WESTECH 2018

作者： Agustin, Friska Abdullah, Chalid Idham Palabiran, Merandy Sulastri, Asti Geology Engineering Study Program Faculty of Earth Sciences and Technology ITB Indonesia Mechanical Engineering Study Program Faculty of Mechanical and Aerospace Engineering ITB Indonesia Indonesia

Prospective area of Solok geothermal lies in step over transtensional between two segments, Suliti and Siulak, Sumatra faults. Geological structure in this prospect area shows structural pattern controlled by "oblique divergent strike-slip fault system" (releasing bend) as a proceed of embraced movement from Sumatra fault and establishes "dilation zone" between those two segments, forming negative flower structure in direction of NW-SE and N-S. The pattern of geological structure is predicted to control the availability of solok geothermal system which in this case related to presence of surface manifestation. The pattern of geological structure is predicted to control the availability of solok geothermal system which in this case related to presence of surface manifestation. Surface manifestation indicates good permeability zone that can be used as flow path of geothermal fluid from reservoir. © Published under licence by IOP Publishing Ltd.

关键词： Geothermal fields

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Wear of cylinder liner due to friction load of piston ring with various surface temperature

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AIP Conference Proceedings 2023年第1期2568卷

作者： I. M. Widiyarta I. M. Parwata M. R. Akbar E. F. Baryudha 1Study Program of Mechanical Engineering Faculty of Engineering Udayana University Bali Indonesia 2Magister of Mechanical Engineering Faculty of Engineering Udayana University Bali Indonesia

Wear on the cylinder liner as a combustion chamber is generally because of frictional loads by the piston rings. In addition, high temperatures that occur in the combustion chamber may accelerate the wear of the cylinder liner and shorten the service life of the cylinder liner. In this work, the wear test will be carried out on the cylinder liner of a diesel engine due to the friction load by the piston ring with various temperatures of the contact surface between the cylinder liner and the piston ring. The wear test is carried out on a linear reciprocating pin-on-plate wear test machine with the temperature of the contact surface varied from room temperature of 30 to 400°C. The results show the wear rate of the cylinder liner increases with increasing surface temperatures progressively. The wear mechanism occurs possibly by abrasive or adhesion wear and oxidation wear.

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Effects of additional hydrogen and biodiesel crude palm oil on performance and exhaust gas emissions of one cylinder diesel engine

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AIP Conference Proceedings 2023年第1期2630卷

作者： Kuntang Winangun Atok Setiyawan Bambang Sudarmanta Mechanical Engineering Department Institut Teknologi Sepuluh Nopember Surabaya Indonesia 60111 Mechanical Engineering Study Program Universitas Muhammadiyah Ponorogo Ponorogo Indonesia 63471

The scarcity of fuel oil is caused by the increasing demand for fuel oil, and production at the refineries begins to decrease. Making researchers look for solutions, one of which is new and renewable energy. New and renewable energy can be produced sustainably, such asbiodiesel Crude Palm Oil (CPO), and hydrogen gas. The use of CPO biodiesel is known to be low in emissions, high in oxygen content, and cetane number. However, the use of biodiesel without engine modification can lead to decreased thermal efficiency and increased smoke emissions in the engine. The addition of hydrogen gas in small amounts can improve the performance of diesel engines. This study aimsto determine the performance and emissions of diesel engines using CPO biodiesel and hydrogen gas as fuel. The engine used is a single-cylinderdiesel engine, direct injection, with a constant speed of 2000rpm. The load variation is 1kW to 4kW with 0.5kW increment interval, and the hydrogen flow variation is (2.5, 5, 7.5, 10) Liters per minute. At high load, the results obtained thermal efficiency of 78.75 percent without hydrogen flowand decreased to 24.09 percent with 10lpm hydrogen flow. Increased biodieselfuel consumption and soot emissions along with the addition of hydrogen flow, at full load.

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Hardness improvement of aluminum alloy 2024 t3 after artificial aging treatment 1

Hardness improvement of aluminum alloy 2024 t3 after artific...

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1st International Conference on Design, Energy, Materials and Manufacture, ICDEMM 2018

作者： Astika, I.M. Mechanical Engineering Study Program Faculty of Engineering Udayana University Indonesia

The needs of having strong and light material for many construction is increasing. Aluminum is one of materials that fulfill this requirement with other advantages such as corrosion resistant and easily formed. Generally, hardness of aluminum and its alloys is lower than ferrous metal such as iron and steel. Aluminum hardness improvement can be conducted by heat treatment namely artificial aging. Artificial aging in aluminum alloy type 2024 T3 in this study was conducted in 2 phases that is solution treatment in 500 °C for 1 hour and continued with artificial aging process in 180 °C by holding time 2, 4 and 6 hours. From the conducted research, it was found that there was hardness improvement on aluminum type 2024 T3 in line with the increasing of aging time. The gained microstructure was getting smooth which means the precipitation hardening process was getting perfect. © Published under licence by IOP Publishing Ltd.

关键词： Hardness

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Wear of nickel-tungsten layer on carbon steel with varying contact surface temperature 1

Wear of nickel-tungsten layer on carbon steel with varying c...

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1st International Conference on Design, Energy, Materials and Manufacture, ICDEMM 2018

作者： Widiyarta, I.M. Parwata, I.M. Lokantara, I.P. Study Program of Mechanical Engineering Faculty of Engineering Udayana University Indonesia

The aim of Nickel-Tungsten coatings on the material of carbon steel is to improve the wear resistance of the material. However, with the elevated contact temperature due to friction force in the surface area of sliding may alter the wear resistance of Nickel-Tungsten layers. If the elevated temperature is quite high to reduce the hardness performance of Nickel-Tungsten layers, the layers may be degraded more quickly. In this work, Nickel-Tungsten was deposited on the surface of medium carbon steel in the process of flame powder spray coating with layer thickness of about 0.2 mm. The wear test was conducted using linear reciprocating ball-on-plat with varying surface temperature of about 30°C up to about 250°C. The wear rate and wear mechanism of Nickel-Tungsten layer is investigated. © Published under licence by IOP Publishing Ltd.

关键词： Wear resistance

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