International Journal of Offshore and Coastal Engineeing最新文献_第5页

Experimental and Numerical Study on Roll Damping Structure of Floating Crane Catamaran in Free Floating and Moored Conditions 浮式起重机双体船在自由漂浮和系泊条件下减摇结构的实验与数值研究

International Journal of Offshore and Coastal Engineeing Pub Date : 2020-11-22 DOI: 10.12962/j2580-0914.v4i2.9341

Muhamad Fadkhurrohman Aziz, E. Djatmiko, M. Murdjito, Baharuddin Ali

引用次数: 0

Risk Analysis of Decommissioning Process: Case Studies of Lima-Compresor Platform 退役过程风险分析:以lima - compressor平台为例

International Journal of Offshore and Coastal Engineeing Pub Date : 2020-08-20 DOI: 10.12962/J2580-0914.V4I1.8705

Arif Windiargo, D. Rosyid, Murdjito

{"title":"Risk Analysis of Decommissioning Process: Case Studies of Lima-Compresor Platform","authors":"Arif Windiargo, D. Rosyid, Murdjito","doi":"10.12962/J2580-0914.V4I1.8705","DOIUrl":"https://doi.org/10.12962/J2580-0914.V4I1.8705","url":null,"abstract":"The process of petroleum exploration and exploitation is a crucial activity in the fulfillment of energy needs in the world. The process of petroleum exploration and exploitation is currently centred on shallow water regions in the continental shelf. In the process of petroleum exploration and exploitation in shallow waters, the structure of which is commonly used is the jacket structure. In Southeast Asia there are about 1300 platforms, of which 80% is over 20 years old. When the platform has reached its operational limit, according to the ministerial regulation of ESDM number 1 year 2011 The platform must be decommissioning in accordance with existing technical standards. In the process of demolition, there are certainly risks and hazards that can interfere with the process of decommissioning. It is necessary to do a risk analysis to map the risks that can occur while preparing the mitigation steps. In this study, risk analysis arel conducted by determining the activity that has a significant degree of hazard where it is concluded that activities that have a significant risk level are activities related to construction, lifting, maintenance, well service, and maintenance. From each activity that has a significant hazard level, there was a process of determining the cause of risk using the Fault Tree Analysis (FTA) method while determining the barrier that serves to prevent a risk occurring. The next is to determine the impact that can be inflicted from risk by using the Event Tree Analyis (ETA) method while determining the barrier that serves to prevent and reduce the impact that occurs when there is a peril. These two FTA and ETA diagrams are combined to create a Bowtie diagram to explain in detail the risk management performed at each stage of the decommisiioning process.","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117022980","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 Inspection Scheduling on Free Spanning Subsea Pipeline Using Risk Based Inspection (RBI) Method 基于风险检验(RBI)方法的自由跨越海底管道检验调度分析

International Journal of Offshore and Coastal Engineeing Pub Date : 2020-08-20 DOI: 10.12962/J2580-0914.V4I1.8703

D. Rosyid, Abizar Giffari, Y. Hadiwidodo

{"title":"Analysis of Inspection Scheduling on Free Spanning Subsea Pipeline Using Risk Based Inspection (RBI) Method","authors":"D. Rosyid, Abizar Giffari, Y. Hadiwidodo","doi":"10.12962/J2580-0914.V4I1.8703","DOIUrl":"https://doi.org/10.12962/J2580-0914.V4I1.8703","url":null,"abstract":"The subsea pipeline system of PT. X located at north of West Java transports natural gas with 19 kilometers long and 16 inches standard pipe size. The rough seabed causes free span problem. The system will be threatened by a structural failure of fatigue due to Vortex Induced Vibration (VIV) and local buckling as the effects of free span. In this Final Project, a total of 136 free spans on subsea pipeline system due to the uneven seabed are analyzed. The screening will be done for spans with length and diameter ratio more than 30 to figure out the free span which pass the screening and know the risk level of the subsea pipeline due to free span. The result for fatigue screening due to VIV, spans with a length more than 25 meters did not pass the screening. Local buckling occurred at the longest free span with a length of 62 meters. The level of risk to structural failure caused fatigue due to VIV has the highest level in terms of business and the environment, namely in the medium category. The level of risk to local buckling failures for safety, environmental, and business terms was in low category.","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115737973","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: 1

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 保护气体流量和V型坡口对ASTM A53和A36 GMAW焊接接头拉伸和金相检验的影响分析

International Journal of Offshore and Coastal Engineeing Pub Date : 2020-08-20 DOI: 10.12962/J2580-0914.V4I1.8706

H. Pratikno, Andrea Novia Samiyono, W. Dhanistha

{"title":"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","authors":"H. Pratikno, Andrea Novia Samiyono, W. Dhanistha","doi":"10.12962/J2580-0914.V4I1.8706","DOIUrl":"https://doi.org/10.12962/J2580-0914.V4I1.8706","url":null,"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.","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126926028","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: 1

Influence of Pre-Weld Heat Treatment and Aging Post-Weld Heat Treatment on Tensile Test and Microstructure of Aluminium 6061 Weld Joint 焊前热处理和焊后时效热处理对6061铝合金焊接接头拉伸性能和组织的影响

International Journal of Offshore and Coastal Engineeing Pub Date : 2020-08-20 DOI: 10.12962/J2580-0914.V4I1.8701

H. Pratikno, Tin Rachmatullah, H. Ikhwani

引用次数: 2

The Effect Analysis of Coating Thickness Variation and Mixed Composition of Zinc - Graphite on Epoxy Coating with Steel Plate ASTM A36 镀层厚度变化及锌石墨混合成分对钢板环氧涂层的影响分析

International Journal of Offshore and Coastal Engineeing Pub Date : 2020-08-20 DOI: 10.12962/j2580-0914.v4i1.8707

H. Pratikno, Andry Febrianto, W. Dhanistha

{"title":"The Effect Analysis of Coating Thickness Variation and Mixed Composition of Zinc - Graphite on Epoxy Coating with Steel Plate ASTM A36","authors":"H. Pratikno, Andry Febrianto, W. Dhanistha","doi":"10.12962/j2580-0914.v4i1.8707","DOIUrl":"https://doi.org/10.12962/j2580-0914.v4i1.8707","url":null,"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..","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132825565","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 Study of Mooring Buoy Operability to Support Offloading Operation of Shuttle Tankers with Various Capacities 支持不同容量穿梭油轮卸载作业的系泊浮筒可操作性研究

International Journal of Offshore and Coastal Engineeing Pub Date : 2020-08-20 DOI: 10.12962/J2580-0914.V4I1.8704

M. Fajar, E. Djatmiko, Murdjito

{"title":"The Study of Mooring Buoy Operability to Support Offloading Operation of Shuttle Tankers with Various Capacities","authors":"M. Fajar, E. Djatmiko, Murdjito","doi":"10.12962/J2580-0914.V4I1.8704","DOIUrl":"https://doi.org/10.12962/J2580-0914.V4I1.8704","url":null,"abstract":"This study was conducted to analyse of the operability of mooring buoy initially designed for offloading operation of 35,000 DWT shuttle tankers enhanced to serve the offloading operations of shuttle tankers with 50,000 DWT, 75,000 DWT, and 111,000 DWT capacities. Operability is reviewed in term of mooring line tensions induced by each new variation of tanker capacity under environmental conditions of 1-year, 10-year, and 100-year recurrence. The governing criteria is that the safety factor should meet the appropriate limit as stated in the API RP2SK. Tension on the mooring line increases in parallel with the increasing of tanker capacity. For the case of 35,000 DWT and 50,000 DWT shuttle tankers the operation can be performed in all environmental conditions. For the case of 75,000 DWT shuttle tanker with full load and 67% DWT capacity can fully operate in all environmental conditions, but with 47% DWT capacity could not be operated in the 100-year environmental condition with significant wave height 3.31 m for the direction of inline-L1, inline-L2, and between line-L1&L4. For the case of 111,000 DWT shuttle tanker at all capacity conditions can fully operate in the 1-year environmental condition with significant wave height up to 1.48 m.","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115731032","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 Configuration of Stinger Angle with Depth Variation During Installation On Pipe Diamater 20" in Banyu Urip, Bojonegoro Bojonegoro Banyu Urip管径20”安装时推力角随深度变化的配置分析

International Journal of Offshore and Coastal Engineeing Pub Date : 2017-11-28 DOI: 10.12962/j2580-0914.v1i2.7052

Imam Rochani, Juniavi Dini Kumala Putri, Handayanu Handayanu

{"title":"Analysis of Configuration of Stinger Angle with Depth Variation During Installation On Pipe Diamater 20\" in Banyu Urip, Bojonegoro","authors":"Imam Rochani, Juniavi Dini Kumala Putri, Handayanu Handayanu","doi":"10.12962/j2580-0914.v1i2.7052","DOIUrl":"https://doi.org/10.12962/j2580-0914.v1i2.7052","url":null,"abstract":"The selection of subsea pipeline construction methods used depends on the environmental conditions and behavior of the pipe installation system which acquires a variety of loads during installation and may the result in failure. In this case the required angle stinger configuration is in accordance with the criteria to avoid overstress and local buckling on the pipe during installation, the variation of the depth of 15 meters, 18 meters, 20.65 meters, 21.25 meters and 22.25 meters can help analysis the stress on the pipe in each case. The pipeline is 23.4 km north of Bojonegoro. From the results of the analysis, it is known that the configuration of stinger angles used during installation for each water depth is 15 m with stinger angle 8.88 degree, 18.65 m stinger angle 8.88 degree, 20.65 m stinger angle 8.88 degree, 21.25 m stinger angle 8.88 degree and 22.25 m stinger angle 8.88 degree. The result of pipe stress on the overbend area has a value of 85.13% SMYS or 352.42 Mpa when the direction of wave comes 90 degrees, while the sagbend area of the pipe has a maximum stress of 51.01% SMYS or 211.2 Mpa when the direction of wave comes 180 degrees. Local buckling check results in all conditions show safe results during the installation process.","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126353439","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 the Effect of Welding Sequence Variations on Residual Stresses and Distortions for Welding Pressure Vessels Structures at PT. Petrokimia Gresik using the Finite Element Method 用有限元法分析了焊接顺序变化对格列西克石油公司焊接压力容器结构残余应力和变形的影响

International Journal of Offshore and Coastal Engineeing Pub Date : 2017-11-28 DOI: 10.12962/j2580-0914.v1i2.7053

N. Syahroni, Bayu Iman Fatkurokhim, Handayanu Handayanu

{"title":"Analysis of the Effect of Welding Sequence Variations on Residual Stresses and Distortions for Welding Pressure Vessels Structures at PT. Petrokimia Gresik using the Finite Element Method","authors":"N. Syahroni, Bayu Iman Fatkurokhim, Handayanu Handayanu","doi":"10.12962/j2580-0914.v1i2.7053","DOIUrl":"https://doi.org/10.12962/j2580-0914.v1i2.7053","url":null,"abstract":"The development of oil and gas industry technology has been very advanced, one of the implementation is to connect material materials to support oil and gas industry facilities. Residual stress may occur due to high temperature differences due to welding and also uneven heat distribution. This causes the material to become hard but brittle so that it may cause structural failure in the connection area. In this final project will be simulated welding pressure vessels to determine the structure of residual stresses that occur as well as the influence of Post Weld Heat Treatment on residual stress itself. The material used is aluminum and WPS data coming from the fabrication company. The simulation is divided into 2 steps: thermal and structural analysis. The value of the residual voltage of 1 to pathline pathline 3 is 189 MPa, 124.8 MPa, 100.76 MPa with distortion value of 40.43 mm. Then analyzed Post Weld Heat Treatment referring to AWS D1.1: 2000 to reduce residual stresses that occur. From the results of the Post Weld Heat Treatment value of the residual stress can be reduced significantly. After being treated Post Weld Heat Treatment with variations of temperatures of 200 C, 300 C The maximum residual voltage reduction occurs in pathline 1 to pathline 3 at 125 MPa, 93 MPa, 100 MPa.","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129493632","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 Influence of Slopes to the Stability of Stones in front of Seawall 边坡对海堤前石料稳定性的影响

International Journal of Offshore and Coastal Engineeing Pub Date : 2017-11-28 DOI: 10.12962/j2580-0914.v1i2.7051

H. Armono, D. Setyawan, M. Zikra

引用次数: 0