scholarly journals Application of non-contact magnetic corresponding on the detection for natural gas pipeline

2020 ◽  
Vol 185 ◽  
pp. 01090
Author(s):  
Weiguo Zeng ◽  
Xiaofeng Dang ◽  
Shuhua Li ◽  
Hongmei Wang ◽  
Hao Wang ◽  
...  
Keyword(s):  
Natural Gas ◽  
Ultrasonic Testing ◽  
Maximum Degree ◽  
Gas Pipeline ◽  
Contact Detection ◽  
Natural Gas Pipelines ◽  
Natural Gas Pipeline ◽  
Comprehensive Index ◽  
Detection Technology ◽  
Abnormal Node

This study examined natural gas pipeline by the non-contact magnetic corresponding. To confirm the reliability for the examination of natural gas pipelines by non-contact magnetic corresponding, three abnormal nodes were detected by the appearance inspection and ultrasonic testing. The results suggested that the grade of abnormal nodes by non-contact magnetic corresponding were not absolutely agree with that of the corrosion by ultrasonic testing. However, there was an obvious relevance between the comprehensive index of F by non-contact magnetic corresponding and the maximum degree of corrosion by ultrasonic testing. To sum up, the magnetic corresponding was an effective non-contact detection technology for the natural gas pipeline, while it was necessary to rationally grade the abnormal node according to the comprehensive index of F.

Detection Method of Nature Gas Pipeline Leakage Based on Pattern Recognition

2011 ◽  
Vol 403-408 ◽  
pp. 3144-3148
Author(s):  
Shuai Wang ◽  
Jian Jun Yu ◽  
Ming Qing Yan ◽  
Shu Ying Xiao
Keyword(s):  
Pattern Recognition ◽  
Natural Gas ◽  
Safety Management ◽  
Gas Pipeline ◽  
Actual Condition ◽  
Pipeline Network ◽  
Natural Gas Pipeline ◽  
Detection Technology ◽  
Continuous Progress ◽  
Nature Gas

Natural gas pipeline network is one of the most important city lifeline. Because of the complex process of pipeline operation, there has not an authoritative and reliable way to detect leakage. Taking into account the current continuous progress of pipeline network simulation and mature of gas SCADA system, the fault of natural gas pipeline network can be diagnosed by pattern recognition method. The method takes full advantage of the existing detection technology and the actual condition of the pipe network. It is very useful for pipeline safety management and maintenance.

scholarly journals Options of Natural Gas Pipeline Reassignment for Hydrogen: Cost Assessment for a Germany Case Study

2019 ◽  
Author(s):  
Simonas Cerniauskas ◽  
Antonio Jose Chavez Junco ◽  
Thomas Grube ◽  
Martin Robinius ◽  
Detlef Stolten
Keyword(s):  
Natural Gas ◽  
Energy System ◽  
Gas Pipeline ◽  
Cost Functions ◽  
Pipeline System ◽  
Natural Gas Pipelines ◽  
Natural Gas Pipeline ◽  
System P ◽  
Availability Constraints ◽  
Hydrogen Supply

The uncertain role of the natural gas infrastructure in the decarbonized energy system and the limitations of hydrogen blending raise the question of whether natural gas pipelines can be economically utilized for the transport of hydrogen. To investigate this question, this study derives cost functions for the selected pipeline reassignment methods. By applying geospatial hydrogen supply chain modeling, the technical and economic potential of natural gas pipeline reassignment during a hydrogen market introduction is assessed.The results of this study show a technically viable potential of more than 80% of the analyzed representative German pipeline network. By comparing the derived pipeline cost functions it could be derived that pipeline reassignment can reduce the hydrogen transmission costs by more than 60%. Finally, a countrywide analysis of pipeline availability constraints for the year 2030 shows a cost reduction of the transmission system by 30% in comparison to a newly built hydrogen pipeline system.

The Reliability-Based Assessment of an In-Service X80 Natural Gas Pipeline in China

2014 ◽  
Author(s):  
Kai Wen ◽  
Jing Gong ◽  
Boyuan Zhao ◽  
Wenwei Zhang ◽  
Zhenyong Zhang
Keyword(s):  
Monte Carlo ◽  
Natural Gas ◽  
Reliability Analysis ◽  
Limit State ◽  
Gas Pipeline ◽  
Industrial Practice ◽  
Natural Gas Pipelines ◽  
Natural Gas Pipeline ◽  
State Models ◽  
Basic Input

Guidelines for the application of reliability-based design and assessment to natural gas pipelines were developed under PRCI sponsorship in 2005. The methodology underlying these guidelines has since been adopted as a non-mandatory Annex in the CSA Z662 standard (Annex O). Following the code in CSA Z662 Annex O, the reliability analysis of an in-service X80 pipeline in North-West China is performed using Monte Carlo technique. In this paper, the distributions of basic input parameters such as loadings, material property is derived based on the data collected from industrial practice. And the analysis of limit states, such as yielding of the defect-free pipeline, bursting of the defect-free pipeline, local buckling due to restrained thermal expansion and excessive plastic deformation, is proceeded based on these distributions. The core of reliability analysis lies in the selection and correction of limit state functions. The modification and extension of limit state models is very significant to accurately calculate probability of failure of different natural gas pipelines, so the limit state models are refined to adapt to the specific work conditions in China. A Monte Carlo reliability analysis framework capable of incorporating the data of industrial practice and limit state models has been developed and applied to the evaluation of the X80 natural gas pipeline, then a practical approximation is developed by using Monte Carlo simulation results. A practical example of an in-service X80 natural gas pipeline is presented to illustrate the availability of the reliability analysis. Furthermore, results generated by different basic input parameters in a limit state function are compared. The sensitivity analysis shows the degree of influence of various basic parameters.

scholarly journals An Investigation into the Volumetric Flow Rate Requirement of Hydrogen Transportation in Existing Natural Gas Pipelines and Its Safety Implications

Gases ◽  
2021 ◽  
Vol 1 (4) ◽  
pp. 156-179
Author(s):  
Abubakar Jibrin Abbas ◽  
Hossein Hassani ◽  
Martin Burby ◽  
Idoko Job John
Keyword(s):  
Natural Gas ◽  
Flow Rate ◽  
Compressibility Factor ◽  
Volumetric Flow Rate ◽  
Gas Pipeline ◽  
Internal Erosion ◽  
Gas Pipelines ◽  
Natural Gas Pipelines ◽  
Natural Gas Pipeline ◽  
Wide Range

As an alternative to the construction of new infrastructure, repurposing existing natural gas pipelines for hydrogen transportation has been identified as a low-cost strategy for substituting natural gas with hydrogen in the wake of the energy transition. In line with that, a 342 km, 36″ natural gas pipeline was used in this study to simulate some technical implications of delivering the same amount of energy with different blends of natural gas and hydrogen, and with 100% hydrogen. Preliminary findings from the study confirmed that a three-fold increase in volumetric flow rate would be required of hydrogen to deliver an equivalent amount of energy as natural gas. The effects of flowing hydrogen at this rate in an existing natural gas pipeline on two flow parameters (the compressibility factor and the velocity gradient) which are crucial to the safety of the pipeline were investigated. The compressibility factor behaviour revealed the presence of a wide range of values as the proportions of hydrogen and natural gas in the blends changed, signifying disparate flow behaviours and consequent varying flow challenges. The velocity profiles showed that hydrogen can be transported in natural gas pipelines via blending with natural gas by up to 40% of hydrogen in the blend without exceeding the erosional velocity limits of the pipeline. However, when the proportion of hydrogen reached 60%, the erosional velocity limit was reached at 290 km, so that beyond this distance, the pipeline would be subject to internal erosion. The use of compressor stations was shown to be effective in remedying this challenge. This study provides more insights into the volumetric and safety considerations of adopting existing natural gas pipelines for the transportation of hydrogen and blends of hydrogen and natural gas.

scholarly journals Analysis of Stresses on Buried Natural Gas Pipeline Subjected to Ground Subsidence

1998 ◽  
Author(s):  
Hyoung-Sik Kim ◽  
Woo-Sik Kim ◽  
In-Wan Bang ◽  
Kyu Hwan Oh
Keyword(s):  
Natural Gas ◽  
Gas Pipeline ◽  
Ground Subsidence ◽  
Safety Criterion ◽  
Natural Gas Pipelines ◽  
Natural Gas Pipeline ◽  
Main Pipelines ◽  
Stress And Deformation ◽  
Buried Gas Pipeline ◽  
Allowable Settlement

This study was initiated to examine the stress and deformation characteristics of the pipelines which were subjected to various environmental conditions in order to confirm their integrity. As the part of them, this paper presents the analysis results for the effect of ground subsidence combined with main loads on buried natural gas pipelines. The ground subsidence which can occur for buried gas pipeline has been classified to the three cases. Finite element method was used to analyze the effect of ground subsidence on pipeline of 26 inch (0.660 m) and 30 inch (0.762 m) diameter used as high pressure (70 Kgf/cm2(686.4 Pascal)) main pipelines. This paper shows the result of stress analysis for the pipelines subjected to those three case ground subsidence. Comparing these results with safety criterion of KOGAS (0.9 σ y), maximum allowable settlement and loads have been calculated.

Fitness-for-Service Assessment for Weldments of the Natural Gas Pipeline by Using Failure Assessment Diagram

2002 ◽  
Author(s):  
Jung-Suk Lee ◽  
Jang-Bog Ju ◽  
Jae-il Jang ◽  
Dongil Kwon ◽  
Woo-sik Kim
Keyword(s):  
Natural Gas ◽  
Fracture Mechanics ◽  
Gas Pipeline ◽  
Gas Pipelines ◽  
Service Workers ◽  
Natural Gas Pipelines ◽  
Field Service ◽  
Natural Gas Pipeline ◽  
Failure Assessment ◽  
User Friendly

There are buried natural gas pipelines of which total length amounts to about 2.1×106m in Korea, and it is very important issue to evaluate FFS (Fitness-for-service) when a crack-like flaw was found in operating pipelines. But, the research about this had not yet been performed in Korea. So, this study constructed a FFS code appropriate to Korean natural gas pipeline through comparing and analyzing API 579 and BS 7910 that are lately. In addition, we developed the user-friendly software based on FFS code, so that field service workers who have little idea about fracture mechanics can use easily. The best merit of this code is that it is possible to evaluate FFS for welding HAZ in Korea natural gas pipeline.

scholarly journals Risk Analysis on Leakage Failure of Natural Gas Pipelines by Fuzzy Bayesian Network with a Bow-Tie Model

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Xian Shan ◽  
Kang Liu ◽  
Pei-Liang Sun
Keyword(s):  
Natural Gas ◽  
Risk Analysis ◽  
Bayesian Network ◽  
Gas Pipeline ◽  
Weak Links ◽  
Gas Pipelines ◽  
Natural Gas Pipelines ◽  
Natural Gas Pipeline ◽  
Major Mode ◽  
Bow Tie

Pipeline is the major mode of natural gas transportation. Leakage of natural gas pipelines may cause explosions and fires, resulting in casualties, environmental damage, and material loss. Efficient risk analysis is of great significance for preventing and mitigating such potential accidents. The objective of this study is to present a practical risk assessment method based on Bow-tie model and Bayesian network for risk analysis of natural gas pipeline leakage. Firstly, identify the potential risk factors and consequences of the failure. Then construct the Bow-tie model, use the quantitative analysis of Bayesian network to find the weak links in the system, and make a prediction of the control measures to reduce the rate of the accident. In order to deal with the uncertainty existing in the determination of the probability of basic events, fuzzy logic method is used. Results of a case study show that the most likely causes of natural gas pipeline leakage occurrence are parties ignore signage, implicit signage, overload, and design defect of auxiliaries. Once the leakage occurs, it is most likely to result in fire and explosion. Corresponding measures taken on time will reduce the disaster degree of accidents to the least extent.

Research on Infrared Laser Leak Detection for Natural Gas Pipeline

2012 ◽  
Author(s):  
Bin Xu ◽  
Dongliang Yu ◽  
Jiayong Wu ◽  
Hongchao Wang ◽  
Dongjie Tan ◽  
...  
Keyword(s):  
Natural Gas ◽  
Detection System ◽  
Leak Detection ◽  
Infrared Laser ◽  
Gas Pipeline ◽  
Tunable Diode Laser ◽  
Laser Absorption ◽  
Natural Gas Pipeline ◽  
Detection Technology ◽  
Gas Leak

An airborne infrared laser leak detection technology is proposed to detect natural gas pipeline leakage by helicopter which carrying a detector that can detect a high spatial resolution of trace of methane on the ground. The principle of the airborne infrared laser leak detection system is based on tunable diode laser absorption spectroscopy. The system consists of an optical unit including the laser, camera, helicopter mount, electronic unit with GPS receiver, a notebook computer and a pilot monitor. And the system is mounted on a helicopter. The principle and the architecture of the airborne infrared laser leak detection system are presented. Field test experiments are carried out on West-East Natural Gas Pipeline of China, and the results show that the airborne laser leak detection method is suitable for detecting gas leak of pipeline on plain, desert and hills but unfit for the area with large altitude diversification.

scholarly journals Modeling of Buried Natural Gas Pipeline Decompression

2000 ◽  
Author(s):  
X. L. Zhou ◽  
G. G. King ◽  
R. G. Moore
Keyword(s):  
Heat Transfer ◽  
Natural Gas ◽  
Pipe Wall ◽  
Flow Behavior ◽  
Transient Heat Conduction ◽  
Gas Pipeline ◽  
Brittle Behavior ◽  
Natural Gas Pipelines ◽  
Natural Gas Pipeline ◽  
Proper Design

A pseudo-homogeneous multi-component equilibrium model is developed to study fluid flow behavior and heat transfer during decompression of a buried natural gas pipeline. The model includes non-isentropic effects of heat transfer and viscous dissipation. The heat transfer involves transient heat conduction through the pipe wall and the soil. A numerical scheme is developed to efficiently solve the resulting conservation equations simultaneously with the heat transfer equation. The study shows that the inclusion of transient heat transfer is necessary for accurate modeling the decompression of natural gas pipelines. The temperature reduction on the pipe wall due to fluid expansion can be crucial for the proper design of pipelines to prevent brittle behavior of the pipe steel.

scholarly journals Detection of Natural Gas Leakages Using a Laser-Based Methane Sensor and UAV

2021 ◽  
Vol 13 (3) ◽  
pp. 510
Author(s):  
Sebastian Iwaszenko ◽  
Piotr Kalisz ◽  
Marcin Słota ◽  
Andrzej Rudzki
Keyword(s):  
Natural Gas ◽  
Field Experiments ◽  
Measurement Data ◽  
Gas Pipeline ◽  
Gas Pipelines ◽  
Spatially Correlated ◽  
Natural Gas Pipelines ◽  
Natural Gas Pipeline ◽  
Accuracy Of Measurements ◽  
Methane Concentrations

The safety of the gas transmission infrastructure is one of the main concerns for infrastructure operating companies. Common gas pipelines’ tightness control is tedious and time-consuming. The development of new methods is highly desirable. This paper focuses on the applications of air-borne methods for inspections of the natural gas pipelines. The main goal of this study is to test an unmanned aerial vehicle (UAV), equipped with a remote sensing methane detector, for natural gas leak detection from the pipeline network. Many studies of the use of the UAV with laser detectors have been presented in the literature. These studies include experiments mainly on the artificial methane sources simulating gas leaks. This study concerns the experiments on a real leakage of natural gas from a pipeline. The vehicle at first monitored the artificial source of methane to determine conditions for further experiments. Then the experiments on the selected section of the natural gas pipelines were conducted. The measurement data, along with spatial coordinates, were collected and analyzed using machine learning methods. The analysis enabled the identification of groups of spatially correlated regions which have increased methane concentrations. Investigations on the flight altitude influence on the accuracy of measurements were also carried out. A range of between 4 m and 15 m was depicted as optimal for data collection in the natural gas pipeline inspections. However, the results from the field experiments showed that areas with increased methane concentrations are significantly more difficult to identify, though they are still noticeable. The experiments also indicate that the lower altitudes of the UAV flights should be chosen. The results showed that UAV monitoring can be used as a tool for the preliminary selection of potentially untight gas pipeline sections.

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