System Reliability-Based Assessment on Existing Jacket Platform

2006 ◽  
Author(s):  
Wei-Liang Jin ◽  
Yong He ◽  
Shun-Feng Gong
Keyword(s):  
System Reliability ◽  
Soil Structure ◽  
Mechanical Analysis ◽  
Practical Application ◽  
Statistical Parameters ◽  
Fem Model ◽  
Jacket Platform ◽  
Extreme Loads ◽  
Nonlinear Mechanical ◽  
Mechanics Characteristics

A great deal of existing jacket platforms need to be assessed in order to determine whether they can be reused or not. In allusion to the differences between the existing service platforms and the drafting ones, a methodology of system reliability-based assessment of existing jacket platform is presented and is applied for the assessments of BZ28-1 three jacket platforms which have operated for sixteen years. In terms of nonlinear mechanical analysis, correcting the statistical parameters of the sea states and considering pile-soil-structure nonlinear interaction, the mechanics characteristics of three jacket platforms subjected to extreme loads were analyzed. Based on the FEM model, with Monte Carlo simulation, the reliability of the platforms was studied. From the practical application, the method can be used to estimate the service life of the existing platforms and ensure their secure operation.

System Reliability-Based Assessment on Single Point Mooring Jacket Platform

2005 ◽  
Author(s):  
Wei-Liang Jin ◽  
Yong He ◽  
Shun-Feng Gong ◽  
Jian Song
Keyword(s):  
Return Period ◽  
System Reliability ◽  
Single Point ◽  
Mechanical Analysis ◽  
Assessment Method ◽  
Jacket Platform ◽  
Research Areas ◽  
Extreme Loads ◽  
Mooring Forces ◽  
Offshore Oil

The Single Point Mooring (SPM) jacket platforms have been developed over the last several decades and are widely applied in the exploitation of offshore oil-gas resources. The SPM jacket platforms are continuously subjected to environmental loads due to wave, current, wind and mooring force. As the uncertainty of those loads, the system reliability research of SPM jacket platforms is one of the most important research areas. A methodology of system reliability-based assessment of the SPM jacket platform was introduced in this paper and applied for the assessment of BZ28-1 SPM jacket platform. According to nonlinear mechanical analysis, the mechanics characteristics of SPM jacket platform subjected to extreme loads were analyzed on considering pile-soil-structure nonlinear interaction. Based on the FEM model, with Monte Carlo simulation, the reliability of SPM jacket platform was studied, and the system reliabilities in 20-year-based-period and 50-year-return-period were calculated respectively. The results show that the statistical analysis of parametric variables based on 50-year return period is appropriate, and the mooring forces due to wave are the predominant loads for SPM jacket platforms. The system reliability-based assessment method can provide important and reliable referential suggestions for the design, maintenance and repair of SPM jacket platforms.

scholarly journals Influence of Optimal Intensity Measures Selection in Engineering Demand Parameter of Fixed Jacket Offshore Platform

2021 ◽  
Vol 11 (22) ◽  
pp. 10745
Author(s):  
Sajib Sarker ◽  
Dookie Kim ◽  
Md Samdani Azad ◽  
Chana Sinsabvarodom ◽  
Seongoh Guk
Keyword(s):  
Seismic Performance ◽  
Oil And Gas ◽  
Time History ◽  
Coefficient Of Determination ◽  
Statistical Parameters ◽  
Ground Acceleration ◽  
Jacket Platform ◽  
Intensity Measures ◽  
Optimal Intensity ◽  
Nonlinear Time History

This research identifies the significant optimal intensity measures (IM) for seismic performance assessments of the fixed offshore jacket platforms. A four-legged jacket platform for the oil and gas operation is deployed to investigate the seismic performance. The jacket platform is applied with nonlinearly modeled using finite element (FE) software OpenSees. A total of 80 ground motions and 21 different IMs are incorporated for numerical analyses. Nonlinear time-history analyses are performed to obtain the jacket structure’s engineering demand parameters (EDP): peak acceleration and displacement at the top of the structure. Four important statistical parameters: practicality, efficiency, proficiency, and coefficient of determination, are then calculated to find the significant IMs for seismic performance of the jacket structure. The results show that acceleration-related IMs: effective design acceleration (EDA), A95 parameter, and peak ground acceleration (PGA) are optimal IMs, and the acceleration-related IMs have good agreements with the acceleration-related EDP.

scholarly journals Characteristics Study of Land for Agriculture in Sembalun

2017 ◽  
Vol 1 (2) ◽  
pp. 207
Author(s):  
Azmi Annisa Irradhiyah
Keyword(s):  
Land Use ◽  
Soil Texture ◽  
Soil Structure ◽  
Field Data ◽  
Agricultural Land ◽  
Mechanical Analysis ◽  
Class I ◽  
Slope Length ◽  
Study Population ◽  
Objective Research

This research aims to get the data, manage, analyze and discuss the characteristics of the study of Agricultural Land in Sembalun visits: 1 ) Characteristics of agricultural land, 2) Level of agricultural land suitability. This type of research is quantitative. This study population across the districts in East Lombok, amounting to 20 District of the District Keruak, Jerowaru, Sakra, Sakra West, Sakra East, Terara, Montong Ivory, Sikur, Masbagik, Pringgasela, Sukamulia, Suralaga, Selong, Labuhan Haji, Pringgabaya , Suela, Aikmel, Wanasaba Sembalun and Sambelia. Sampling in this study using Purvosive Sampling. Samples are Sembalun subdistrict. Mechanical Analysis by objective research of agricultural land characteristics observed descriptively and databulasi of the field data belongs to the growing requirements of agriculture which can be seen from the slope, soil structure, slope length, slope shape, texture soil, land use criteria. The research found that: 1) Characteristics of agricultural land in Sembalun, had several criteria: a slope in the category Sembalun including steep or less suitable for agriculture by 46-65% kemiringin slope, soil to soil Sembalun criteria granular, blocky or appropriate agricultural land and have long used the medium to long 15-50m, soil texture Sembalun criteria belong to the category of rough because it is composed by sand-plated, dusty sand, slope shape in Sembalun belong to the variation convex with dignity 2 for observation location along notching it is always a convex slope, land use Sembalun belong to the criterion of berlukar / mixed farms with dignity 2. Because along the way, the land berlukar / mixed farms. 2) Suitability of farmland in Sembalun based on the results of pengharkatan to 6 land characteristics, the number value obtained was 12 with class suitability for agricultural land belonging to the class I (land suitable for agriculture).

System Reliability of Existing Jacket Platform in Malaysian Water (Failure Path and System Reliability Index)

2014 ◽  
Vol 567 ◽  
pp. 307-312 ◽  
Author(s):  
V. John Kurian ◽  
Mohamed Mubarak Abdul Wahab ◽  
T.S. Kheang ◽  
Mohd Shahir Liew
Keyword(s):  
System Reliability ◽  
Reliability Index ◽  
Structural Reliability ◽  
Pushover Analysis ◽  
Probability Of Failure ◽  
Jacket Platform ◽  
First Order ◽  
Failure Path ◽  
Reliability Method ◽  
Two Parameters

The objective of this work is to determine the structural reliability of an existing jacket platform in Malaysia, by determining the system probability of failure and its corresponding reliability index. These two parameters are important indicators for assessing the integrity and reliability of the platform, and will point out whether the platform is suitable for continued operation. In this study, pushover analysis is used to determine possible failure paths of the structure, while First Order Reliability Method (FORM) and Simple Bound Formula are used to determine the failure probability and reliability index. Three failure paths of the platform are established. The reliability index of these paths is found with the highest Reliability Indexto be 18.82 from the 315-degree path, while the system reliability index is 9.23. This illustrates that the platform is robust and the chances of collapse is very small.

scholarly journals Two-layer Contact Nonlinear Mechanical Analysis of Flexible Drilling Tool in The Wellbore

2020 ◽  
Vol 123 (1) ◽  
pp. 75-100
Author(s):  
Min Luo ◽  
Tingting Xu ◽  
Jiajun Jiang ◽  
Xu Chi ◽  
Jing Wang ◽  
...  
Keyword(s):  
Mechanical Analysis ◽  
Drilling Tool ◽  
Nonlinear Mechanical ◽  
Layer Contact

Geometric Analysis of Adaptive Origami Channels for Heat Transfer Applications

2017 ◽  
Author(s):  
Nathan Price ◽  
Andrew Gillman ◽  
Kazuko Fuchi ◽  
Edward J. Alyanak ◽  
Philip R. Buskohl
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Thermal Management ◽  
Large Range ◽  
Geometric Analysis ◽  
Mechanical Analysis ◽  
Combustion Engines ◽  
Analysis Techniques ◽  
Art Form ◽  
Nonlinear Mechanical

Thermal management is a ubiquitous and critical engineering challenge for a broad range of applications, including combustion engines, high power electronics and chemical processing. However, conventional heat exchanger solutions are often static with limited ability to adaptively modulate heat transfer. Folding concepts from the ancient art form of origami could potentially address these challenges by providing large conducting surfaces that can also spatially reconfigure to regulate the flow and temperature field interactions with the heat transferring medium. In this study, trigonometric and nonlinear mechanical analysis techniques are applied to origami channel designs based on the “waterbomb” and Miura-ori unit cell to characterize the geometric properties of the structures as a function of folding. Both channels demonstrate a large range of flow control, with potentially enhanced mixing in the “waterbomb” channel, due to an axially varying cross-section. The results show promise for the use of origami-based heat exchanger designs for both improved passive and active control of heat transfer.

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