Research on Aseismatic Measures of Gas Pipeline Crossing a Fault for Strain-Based Design

2009 ◽  
Author(s):  
Xiaoting Gu ◽  
Hong Zhang
Keyword(s):  
Design Method ◽  
Large Diameter ◽  
Strain Analysis ◽  
Gas Pipeline ◽  
Analysis Model ◽  
Buried Pipe ◽  
Size And Shape ◽  
Buried Gas Pipeline ◽  
Pipeline Design ◽  
Pipeline Crossing

There are a lot of researches on qualitative aseismatic measures for buried gas pipeline crossing movable faults. But a few of them are quantitative, especially in the size and shape of the trench. In this paper, based on strain-based pipeline design method and finite element method, a new strain analysis model for buried large diameter gas pipeline is presented that deals quantitatively with the pipeline strain influencing factors, such as the size and shape of the trench, buried pipe depth, crossing angle between pipeline and fault, pipe diameter and wall thickness, mechanical properties of original soil and back fill soil, inner pipeline pressure. In this model, the pipeline is simulated by pipe element and elbow element, soil-pipe interaction is reduced to 3 dimensional soil spring. By means of FEM software ABAQUS, detail analysis is performed for a real design case of pipeline crossing a movable fault in the second west-east gas pipeline project of China, and optimized pipeline crossing fault scheme is proposed which can minimize the pipeline strain and limit it in allowable value.

Strain Analysis of Oil and Gas Pipeline with Dents Based on ILI Data

2016 ◽  
Vol 853 ◽  
pp. 372-376
Author(s):  
Zheng Qiang Lei ◽  
Jian Chen ◽  
Fu Xiang Wang ◽  
Ting Wang ◽  
Li Jian Zhou
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Oil And Gas ◽  
Strain Analysis ◽  
Gas Pipeline ◽  
Safe Operation ◽  
Buried Pipe ◽  
Strain Calculation ◽  
Acceptable Range ◽  
Integrity Analysis

Dents in an oil and gas pipeline can be detected by In-line-Inspection (ILI), and structure integrity analysis of the pipe with theses reported dents is important for the safe operation. Strain analysis of the dented pipe is a way of fine assessment and ASME B31.8 has established the strain assessment code and its acceptable range. However, the method of strain assessment is rarely used due to the difficulty of strain calculation for a buried pipe. In this study, features of ILI data are investigated to elaborate the necessary of filtering analysis for strain analysis of the dent with ILI data. Then typical filtering methods are used to smooth the ILI data, and strain analysis are carried out with the smoothed data to study the practicability of strain assessment. Profile and strain of a dent in D813 pipe were obtained by Finite Element Method (FEM). Then different filtering methods were used to smooth the simulated ILI data of the dent which were selected from FEM profile. Strain of the dent were also calculated by smoothed data with the latest ASME B31.8 code, and compared with it from FEM at last to prove the feasibility and validity of the filtering methods with ASME B31.8 code.

Retroerosion in a TBG Gas Pipeline Crossing and its Rehabilitation

2019 ◽  
Author(s):  
Cesar Augusto Costa ◽  
Walter Schultz Neto ◽  
Thiago Wichrestink Zozula
Keyword(s):  
Process Analysis ◽  
Temporal Trends ◽  
Gas Pipeline ◽  
Aerial Photographs ◽  
Erosion Process ◽  
Buried Pipe ◽  
Base Level ◽  
Channel Erosion ◽  
Equilibrium Profile ◽  
Pipeline Crossing

Abstract This Paper presents a case study of the Jardim Novo Maracanã stream situated in Campinas, São Paulo, in which recent streambed modifications were characterized, aiming to define the rates and the potential erosions along the channel alignment of which have Bolivia-Brazil Gas Pipeline crossing. Its presents the erosion process analysis and mitigation concepts aimed at the pipeline and fiber optic cables facilities integrity, as well as to indicate the design issues, considering the streambed deepening in this watershed. For this, satellite images and aerial photographs were collected in different periods, soil and subsoil surveys were performed, information on rainfall and watershed characteristics was analyzed, as well as hydrological and hydrotechnical studies were developed. These studies included geotechnical channel and banks analyzes, the spatial and temporal trends of the fluvial geomorphology evolution and the infrastructures safety conditions analysis. It was concluded that a new channel erosion process occurred after the streambed was filled by recent sediments. This process is associated with an increase floods magnitude, the slopes occupation intensification with the county urbanization and the streambed conditions changes, from an alignment sinuous to rectilinear and from a shallow to deeper channel. Once initiated, the channel erosion process maintained its retroerosion, i.e. its “headcutting” trend, deepening its equilibrium profile to its stratigraphic base level, located about 5.0 m below the 2014 stream bottom, in the pipeline cross section. Alternative concepts for the infrastructure integrity rehabilitation in these new morphological-fluvial conditions were also developed and dimensioned. Among these, the rectangular culverts alternative was adopted. They support a landfill at the crossing with the buried pipe and have to 100-year return period peak flows capacity.

Response Law and Influencing Factors of the Soil under Action of Pile Driving Vibration Based on Midas/GTS

2013 ◽  
Vol 353-356 ◽  
pp. 979-983
Author(s):  
Dong Zhang ◽  
Jing Bo Su ◽  
Hui De Zhao ◽  
Hai Yan Wang
Keyword(s):  
Damping Ratio ◽  
Large Diameter ◽  
Time History ◽  
Pile Driving ◽  
Analysis Model ◽  
Vibration Load ◽  
History Analysis ◽  
Study Results ◽  
Propagation Law ◽  
Dynamic Time

Due to the upgrade and reconstruct of a high-piled wharf, the piling construction may cause the damage of the large diameter underground pipe of a power plant nearby. For this problem, a dynamic time-history analysis model was established using MIDAS/GTS program. Based on the analysis of the pile driving vibration and its propagation law, some parameters, such as the modulus of the soil, the Poissons ratio of soil, the action time of vibration load and the damping ratio of the soil that may have an effect on the response law of the soil, were studied. The study results not only serve as an important inference to the construction of this case, but also accumulate experience and data for other similar engineering practices.

Stress Analysis and Strength Checking for High Pressure Gas Pipeline in the Earthquake Rupture Area

2013 ◽  
Vol 470 ◽  
pp. 866-870
Author(s):  
Wei He ◽  
Yan Dong Liu ◽  
Guo Xing Wang
Keyword(s):  
Finite Element ◽  
High Pressure ◽  
Stress Analysis ◽  
Gas Pipeline ◽  
Earthquake Rupture ◽  
Rupture Area ◽  
Pipeline Crossing ◽  
The Way

Based on the actual project example of high pressure gas pipeline crossing earthquake rupture area, the paper shows and explains the way to make stress analysis and strength checking calculation for the high pressure gas pipeline in the earthquake rupture area by the method of finite element.

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