International Journal of Offshore and Coastal Engineeing最新文献_第4页

Influence Analysis of Shielding Gas Flow Rate and Purity Level Variation on GMAW Welding Process to Microstructure of Alumunium 5083 保护气体流量及纯度变化对5083铝合金GMAW焊接组织的影响分析

International Journal of Offshore and Coastal Engineeing Pub Date : 2021-05-01 DOI: 10.12962/J2580-0914.V4I3.9954

N. Syahroni, Sadewa Sechan Winando, Y. Mulyadi

{"title":"Influence Analysis of Shielding Gas Flow Rate and Purity Level Variation on GMAW Welding Process to Microstructure of Alumunium 5083","authors":"N. Syahroni, Sadewa Sechan Winando, Y. Mulyadi","doi":"10.12962/J2580-0914.V4I3.9954","DOIUrl":"https://doi.org/10.12962/J2580-0914.V4I3.9954","url":null,"abstract":"Aluminium is a commonly used material in construction and transportation industries. The advantages of using the aluminium material are its light weight, corrosion resistant, and the capability to form an alloy with another metal. Therefore, the aim of this research is to analyze the influence of shielding gas flow rate and purity level variation to mechanical properties and microstructure of the welded material. The welding process used on this research was the GMAW method. The material used was aluminium 5083 series with 300 mm x 150 mm x 8 mm dimensions. The shielding gases used were high purity (HP) and ultra-high purity (UHP) argon (Ar). The variations of shielding gas flow rate used were 16, 18, dan 20 litre/minutes. Based on the tensile test that has been done, the variation of UHP argon gas with 20 litre/minute flow rate had the best result with yield strength of 217,32 MPa and ultimate strength of 295,83 MPa. The result of the micro photos showed that the GMAW method produced small dots where the dots were Mg2Si formation, which the greater number of smaller size dot produced would increase the mechanical properties of the material.","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"199 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122306106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Local Stress Analysis in the Chain Link of Mooring Line That Had Diameter Degradation 直径退化系泊索锚链局部应力分析

International Journal of Offshore and Coastal Engineeing Pub Date : 2021-05-01 DOI: 10.12962/J2580-0914.V4I3.9952

Rafliansyah Azhar Putera, E. Djatmiko, M. Murdjito

{"title":"Local Stress Analysis in the Chain Link of Mooring Line That Had Diameter Degradation","authors":"Rafliansyah Azhar Putera, E. Djatmiko, M. Murdjito","doi":"10.12962/J2580-0914.V4I3.9952","DOIUrl":"https://doi.org/10.12962/J2580-0914.V4I3.9952","url":null,"abstract":"Mooring systems are used to moored ships at a particular area. One of its type is SPM by using a buoy. The system generally uses chains used to tie buoys to the seabed. However, chains that are used continuously can experience degradation in the diameter of the chain connection. The degradation experienced by the connections between the chains will certainly affect the local ( von Mises stress). According to ABS rules, the amount of local stress or von Mises stress that occurs on an object must not exceed 90% of the yield strength of the material. Therefore, it is necessary to do a local stress analysis to determine the extent of degradation of the diameter of the chain connection so that the local stress value does not exceed that allowed. The largest mooring tension value that occurs in the mooring system is 1838,252 kN. The results show that if the chain connection is subject to a tension of 1838,252 kN, the diameter degradation that occurs in the chain connection must not exceed 15% of the initial diameter so that the local or von Mises stress does not exceed 369 MPa (90% of the yield strength of the material 410 MPa).","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114174813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative Analysis of FCAW, and GMAW Welding With Heat Input Variations on A36 Steel Against Vickers Hardness Test and Macrostructure A36钢热输入变化下FCAW与GMAW焊接维氏硬度试验及宏观组织对比分析

International Journal of Offshore and Coastal Engineeing Pub Date : 2021-02-21 DOI: 10.12962/J2580-0914.V4I4.10931

H. Pratikno, Nugraha Adhi Pahlawan, W. Dhanista

引用次数: 2

Experimental & Numerical Studies of Vertical Motion Acceleration Analysis in Helideck on a Catamaran Floating Crane 双体船浮式起重机直升机甲板垂直运动加速度分析的实验与数值研究

International Journal of Offshore and Coastal Engineeing Pub Date : 2021-02-13 DOI: 10.12962/j2580-0914.v4i3.9955

Yunan Setiawan Suwandono, E. Djatmiko, M. Murdjito, Abdul Ghofur

{"title":"Experimental & Numerical Studies of Vertical Motion Acceleration Analysis in Helideck on a Catamaran Floating Crane","authors":"Yunan Setiawan Suwandono, E. Djatmiko, M. Murdjito, Abdul Ghofur","doi":"10.12962/j2580-0914.v4i3.9955","DOIUrl":"https://doi.org/10.12962/j2580-0914.v4i3.9955","url":null,"abstract":"ABSTRAK This research discusses the operability of vertical acceleration in the helideck. The experiment was carried out at the Maneuvering and Ocean Engineering Basin (MOB) facility of the BPPT-ITS Hydrodynamics Technology Center. The model being tested is the catamaran type with a scale of 1:36 to the original scale. Experimental testing using random waves with a Piersonmaskowitz spectrum with Hs = 2.5 and Hs = 6.37 m. The helideck only performs surge sway and heave tests. Meanwhile, numerical analyzes the effects of regular waves at heading 0 45 90 135 180 and obtained RAO for Heave, Roll, Pitch movements. For the analysis of landing operability at Helideck using the Olson and Marine criteria, where the limit of wave height according to Olson is obtained, namely for the incoming wave direction of 0, 90,180, it should not be done more than 3 meters of wave height, while for conditions 450 and 1350 should not be above 4 meters. . For the HCA category, the critical condition when the direction of the wave of 900 with a wave height of 2 meters. At an altitude of 4 meters is the limit of the wave direction 0 45 135 180.","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128379862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental Study and Numerical Analysis of Floating Crane Catamaran Mooring Tension in Intact and Damage Conditions Using Time-Domain Approach 基于时域方法的浮式起重机双体船系泊张力试验研究与数值分析

International Journal of Offshore and Coastal Engineeing Pub Date : 2021-02-13 DOI: 10.12962/J2580-0914.V4I3.9957

Mochamad Hanif Rafi’i, E. Djatmiko, Murdjito, Erdina Arianti

{"title":"Experimental Study and Numerical Analysis of Floating Crane Catamaran Mooring Tension in Intact and Damage Conditions Using Time-Domain Approach","authors":"Mochamad Hanif Rafi’i, E. Djatmiko, Murdjito, Erdina Arianti","doi":"10.12962/J2580-0914.V4I3.9957","DOIUrl":"https://doi.org/10.12962/J2580-0914.V4I3.9957","url":null,"abstract":"Floating Crane Catamaran equipped with a mooring system to keep stable while operating. During operation, wave load causes tension on the mooring system. In this study, the tension of the mooring system was analyzed using experimental studies and numerical analysis with intact and damaged mooring conditions. Experimental studies were carried out by simulating a physical model in the Ocean Basin Maneuvering Laboratory, BTH-BPPT. While numerical using related software. Mooring tension analysis is carried out using the frequency domain approach which refers to the API RP 2SK rules. The sum of the average tension, significant low frequency tension and maximum wave frequency tension is the maximum tension of the mooring system. The low frequency tension and wave frequency tension is obtained by the low-band-pass filter process. The stochastic value is obtained by the FFT of low frequency and wave frequency tension. The results of maximum tension from experimental and numerical at intact conditions, wave headings 90°, Hs 2.5 m, are 373.7 kN and 441.6 kN and at Hs 6.37 m are 565.6 kN and 1741.5 kN. In the damaged condition, wave heading 90°, Hs 2.5 m, the maximum tension is 863.9 kN and 2113.3 kN.","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128356099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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 镁片玻璃涂层厚度变化及混合成分对环氧涂层对ASTM A36钢板耐磨性、附着强度及腐蚀速率预测的影响分析

International Journal of Offshore and Coastal Engineeing Pub Date : 2020-11-22 DOI: 10.12962/j2580-0914.v4i3.9956

H. Pratikno, Yudiardana Tridantoko Susarno, H. Ikhwani

{"title":"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","authors":"H. Pratikno, Yudiardana Tridantoko Susarno, H. Ikhwani","doi":"10.12962/j2580-0914.v4i3.9956","DOIUrl":"https://doi.org/10.12962/j2580-0914.v4i3.9956","url":null,"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.","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128526197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of Pipe Lay Barge Hafar Neptune Capability in Pipelaying Operation at Offshore North West Java Oil and Gas Field 西北爪哇油气田铺管作业中铺管驳船Hafar Neptune能力分析

International Journal of Offshore and Coastal Engineeing Pub Date : 2020-11-22 DOI: 10.12962/j2580-0914.v4i2.9338

Ignasius Krisna Armanda, E. Djatmiko, Imam Rochani

{"title":"Analysis of Pipe Lay Barge Hafar Neptune Capability in Pipelaying Operation at Offshore North West Java Oil and Gas Field","authors":"Ignasius Krisna Armanda, E. Djatmiko, Imam Rochani","doi":"10.12962/j2580-0914.v4i2.9338","DOIUrl":"https://doi.org/10.12962/j2580-0914.v4i2.9338","url":null,"abstract":"When pipelaying activity is carried out, the most influential factor is the significant wave height. In this final project, the maximum significant wave height allowed for the PLB during the pipelaying process was analyzed with the variation of pipe diameters, which are 8 inches, 10 inches, and 12 inches; variations in the direction of coming waves namely 0, 45, 90, 135, and 180; and stinger angle variations. First, static analysis was performed using OFFPIPE software Then, Pipe Lay Barge (PLB) Hafar Neptune modelled with MOSES software and validated with ABS MODU codes. The output was RAO from the Hafar Neptune PLB. Next, dynamic analysis was performed with OFFPIPE software, where the input is static analysis, RAO of Pipe Lay Barge Hafar Neptune, and JONSWAP wave spectrum formulation. The result of the analysis was the significant wave height that could hit the PLB when pipelaying is 3 meters for all pipe diameter variations. For variations in the direction of the wave data, the maximum Hs were 3 meters for 0 ° and 180 °, 2.5 meters for 45 °, 1.5 meters for 90 ° and 135 °.","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132440180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fatigue Life Comparison of Modified and Conventional 3 Leg Jacket Offshore Structure 改进与常规三腿导管架海上结构疲劳寿命比较

International Journal of Offshore and Coastal Engineeing Pub Date : 2020-11-22 DOI: 10.12962/J2580-0914.V4I2.9306

Muhammad Nabil Ghiffary, Murdjito, R. Prastianto

{"title":"Fatigue Life Comparison of Modified and Conventional 3 Leg Jacket Offshore Structure","authors":"Muhammad Nabil Ghiffary, Murdjito, R. Prastianto","doi":"10.12962/J2580-0914.V4I2.9306","DOIUrl":"https://doi.org/10.12962/J2580-0914.V4I2.9306","url":null,"abstract":"The jacket structure must be adapted to the conditions of the production field to support economic factors. So, the concept of a modular platform for minimal, low-cost facilities is adopted. However, the design differences will affect the performance of the jacket itself, in other words a modular jacket can withstand the same load as a conventional jacket model but has a different structural performance. Therefore, this research discusses the performance comparison, which includes the fatigue life and the natural period, between conventional and modular jacket structures, which in this study are referred to as modified jackets. Conventional jacket as a comparison structure takes the design basis of the modified structure, including the same structural profiles, and environmental loads. In this study, the two jackets will only be modeled on the jacket part and the superstructure will be modeled as a joint load on the three upper ends of the jacket legs. Fatigue life analysis in this study used the full spectral analysis method. By using SACS software, the natural period of modified jacket is 1.756 s and conventional jacket is 1.472 s. While the lowest fatigue life on modified jacket is 44.98 years and conventional jacket is 9125.79 years.","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123852190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pipe Stacking Optimization and Sea Fastening Analysis of Linepipe Transport 管道运输堆管优化及海上紧固分析

International Journal of Offshore and Coastal Engineeing Pub Date : 2020-11-22 DOI: 10.12962/j2580-0914.v4i2.9340

Carlo Jonathan Sihombing, D. Rosyid, R. Riyanto

{"title":"Pipe Stacking Optimization and Sea Fastening Analysis of Linepipe Transport","authors":"Carlo Jonathan Sihombing, D. Rosyid, R. Riyanto","doi":"10.12962/j2580-0914.v4i2.9340","DOIUrl":"https://doi.org/10.12962/j2580-0914.v4i2.9340","url":null,"abstract":"Subsea pipeline is a system comprised of multiple linepipes that are welded when installed on location used to distribute fluid such as oil and natural gas. Fabricated linepipes are to be stacked on cargo barge and transported to the installation location. This operation takes significant time and involves numerous linepipes. Optimization needs to be done to make sure the transport operation is executed efficiently. Optimization attempt was done using data from Double Joint Linepipe Transport Operation of Tangguh Expansion Project by Saipem Indonesia. Parameters considered during the optimization process include linepipe qualities during stacking, cargo barge strength and stability, and sea fastening property strength. Roark’s Formulas for Stress and Strain formulas are used in pipe stacking analysis to find stacking limit for each type of linepipes. Stability analysis is done by using DNVGL-ST-N001 as a guide and Maxsurf software for modelling. SACS software is used to analyzed sea fastening properties with guidance from DNVGLST-N001. Finally, optimization is done using a multi-criteria optimization method by using values from each analysis as parameters. Optimization results find that pipe stacking method using side support is 8.41% more optimal than standard pipe stacking method from Saipem Indonesia.","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114066057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of Influence of Abrasive Material Variation and Spray Pressure Variation in Coating Epoxy of Astm A36 Steel Toward Impact Resistance and Corrosion Rate 磨料变化和喷涂压力变化对Astm A36钢环氧涂层抗冲击性能和腐蚀速率的影响分析

International Journal of Offshore and Coastal Engineeing Pub Date : 2020-11-22 DOI: 10.12962/j2580-0914.v4i2.9337

H. Pratikno, Bima Satriya Willy Harsa, S. Sholihin

引用次数: 0