Reliability-Based Scheme Design for Fault-Crossing of X90 Pipeline

2014 ◽  
Vol 1030-1032 ◽  
pp. 2601-2607
Author(s):  
Yu Qing Liu ◽  
Zhen Yong Zhang ◽  
Kai Wen
Keyword(s):  
Failure Probability ◽  
Oil And Gas ◽  
Theoretical Foundation ◽  
Design Method ◽  
Influence Factors ◽  
Steel Grade ◽  
Pipeline Transportation ◽  
Long Distance ◽  
Reliability Design ◽  
Scheme Design

While high steel grade X70, X80 pipeline has been widely used in long-distance oil and gas pipeline engineering of China, to further improve steel grade to X90 is an effective way to increase the efficiency of pipeline transportation and reduce construction cost. In this paper, the failure probability of earthquake fault crossing of X90 pipeline has been calculated with the strain-based reliability design method and the design scheme has been adjusted according to sensitivity analysis with influence factors of the failure probability of fault-crossing of X90 pipeline, after that the scheme of fault-crossing of X90 pipeline which meets requirements of pipeline reliability has been figured out. This study has laid a theoretical foundation for the application of X90 pipeline in future construction of pipeline engineering.

Application of Reliability-Based Design Method of Pipeline Material Selection

2014 ◽  
Author(s):  
Zhenyong Zhang ◽  
Wen Wei Zhang ◽  
Jinyuan Zhang ◽  
Yuqing Liu
Keyword(s):  
Failure Probability ◽  
Material Selection ◽  
Design Method ◽  
Limit State ◽  
Third Party ◽  
Ultimate Limit State ◽  
Permafrost Region ◽  
Pipe Material ◽  
Pipe Failure ◽  
Reliability Design

A certain inland pipeline is located in a cold area and traverses the alpine-cold and permafrost region. For design and selection of steel grade pipeline in such an area, the resistance of X52 and X60 pipes is calculated and analyzed using the reliability design method for the first time based on a comparison of conventional economy and technical schemes, combined with the analysis on pipe failure, reason, and type as well as the ultimate limit state. According to calculation and analysis, the overall resistance of X52 9.5mm pipe is higher than that of X60 8.7mm pipe, except for the equal resistance against excavation and puncture by a third party. This is especially true in regard to the ultimate tensile strain and compression strain, increasing by 17% and 31% respectively. By adopting the Monte Carlo method using certain parameters about pipe material, construction and operational maintenance, the failure probability of X52 and X60 pipes under corrosion as well as excavation and puncture by a third party is calculated and analyzed quantitatively. The result shows that the failure probability of X52, 9.5mm pipe is 2.61 ×10−4 times per kilometer per year which is much less than that of X60 8.7mm pipe (5.50 ×10−4 times per kilometer per year). Considering the safe reliability of pipeline, the X52 9.5mm pipe scheme is far superior to X60 8.7mm pipe scheme. Therefore the former scheme is recommended for design which only increases the cost by 1.5%.

scholarly journals Proposal on Hybrid Design Method of Outer Port Facilities Using Failure Probability

2021 ◽  
Vol 8 (4) ◽  
pp. 237-253
Author(s):  
Yong Jun Cho
Keyword(s):  
Failure Probability ◽  
Design Method ◽  
Critical Value ◽  
Reliability Design ◽  
Reliability Based Design ◽  
Design Wave Height ◽  
Nominal Diameter ◽  
Port Facilities ◽  
Physical Background ◽  
Wave Slope

Lately, many efforts have been made to address the problem concerned with deterministic design using reliability-based design, and the research results are significant. However, there is considerable confusion in the design practice regarding how to use failure probability, the main output of reliability-based design. In this rationale, this study aims to develop a robust hybrid deterministic design method for outer port facilities using the failure probability. To this end, we first reviewed the design process of Eulleungdo East Breakwater, some of which were recently damaged. It was revealed that the exceeding probability of design wave height of 5.2 m was merely 0.65, which corresponds to a return period of 1.53 years, showing that the outer port facilities of Ulleungdo were considerably underdesigned. In an effort to find an alternative that can overcome the limitations of the deterministic design method, which is highly likely to involve subjective judgment, a Level III reliability design was carried out. In doing so, tri-modal Gaussian wave slope distribution was used as a probabilistic model for wave slope. Numerical results show that failure probability was excessively estimated in the Gaussian distribution, and even if the TTP size was slightly reduced, the failure probability increased rapidly. Although failure probability is sensitive to the change in nominal diameter, there is a gradually increasing zone where the failure probability change rapidly decreases when the nominal diameter is larger than the critical value. The presence of a Gradually Increasing Zone mentioned above implies that it is uneconomical and has no physical background to adjust the nominal diameter to be larger than the critical value. Therefore, it can be easily conceived that outer port facility design should be performed using a failure probability provided by Level III reliability-based design.

scholarly journals Study on the Surveillance System of Water Stage Used the Resonator Pressure Transducer and Wireless Connectivity

2018 ◽  
Vol 228 ◽  
pp. 02001
Author(s):  
Bing Han ◽  
Qiang Fu
Keyword(s):  
Surveillance System ◽  
Pressure Transducer ◽  
Oil And Gas ◽  
Low Cost ◽  
Regional Scale ◽  
Time Data ◽  
Long Distance ◽  
Hydrogeological Parameters ◽  
Water Stage ◽  
Wireless Connectivity

For the sake of ameliorating the faultiness of low precision for conventional surveillance methods of water stage, and realize the goal of real time data collection, automated actions and long-distance conveying, we have designed a novel surveillance system of water stage with the resonator pressure transducer and wireless connectivity technologies. The surveillance system of water stage has come into service in a field experiment project of a certain oil and gas pipeline engineering. By analyzing and comparing the results of experiments, the system has the merits of high agility, reliability, instantaneity and accuracy, low cost, capacity of resisting disturbance, which making it ideal for use in unattended supervising of water stage for multi-spots observation based on regional scale. The surveillance system can well satisfy the actual demand of auto hydrogeological parameters monitoring for geotechnical engineering.

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