Performance assessment of multi-MFL inspection using feature-based POD

2021 ◽  
Vol 63 (10) ◽  
pp. 592-596
Author(s):  
Xiang Peng ◽  
Kevin Siggers ◽  
Zheng Liu
Keyword(s):  
Oil And Gas ◽  
Probability Of Detection ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Feature Based ◽  
Detection Capabilities ◽  
Corrosion Defects ◽  
Minimum Criteria ◽  
Pipeline Failures ◽  
Non Destructive

Oil and gas pipelines, which transport large quantities of oil products and natural gas, are subject to pipeline failures caused by corrosion. Magnetic flux leakage (MFL) is one of the most popular non-destructive testing (NDT) techniques for the detection of pipeline corrosion. Since individual MFL is insensitive to the corrosion components that are parallel with its magnetic field, two types of MFL tools with perpendicular magnetic fields are usually employed in one inspection to detect all corrosion defects. This study applies probability of detection (POD) to quantitatively assess the detection capabilities of two individual MFL tools and their combination. Due to the characteristics of MFL inspection, this study proposes the construction of the POD model as a function of two geometric features, namely the volume and the orientation, which have a significant influence on the MFL signal response. Detection results from two MFL tools are integrated using logical OR operation to study the POD of their combination. With the proposed POD model, the minimum criteria that ensure a corrosion defect will be reliably detected by MFL tools are studied in this paper. The validity of the proposed POD model is justified on the data collected from an in-service pipeline.

Probability of Detection (POD)-Oriented View to Fault Diagnosis for Reliability Assessment of FDI Approaches

2018 ◽  
Author(s):  
Daniel A. Ameyaw ◽  
Sandra Rothe ◽  
Dirk Söffker
Keyword(s):  
Reliability Assessment ◽  
Research Area ◽  
Performance Measure ◽  
Probability Of Detection ◽  
Fault Detection And Isolation ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Feature Based ◽  
Detection Quality ◽  
Non Destructive

Reliability assessment of Structural Health Monitoring systems applied to the diagnosis of faults in elastic structures is discussed in this contribution. In the field of Non Destructive Testing (NDT), Probability of Detection (POD) is used as a performance measure for quantifying the reliability of NDT approaches. However, reliability measures applied to Fault Detection and Isolation (FDI) is not discussed much in this research area. In this contribution the reliability of vibration-based monitoring approaches with respect to their principal ability to detect changes, realize diagnosis, and isolate causes (as FDI) is discussed. Using eigenfrequency and band power as attributes, a novel feature-based POD is proposed and implemented as a reliability measure for vibration-based FDI. The a90/95 criteria which represents 90% probability of detecting a fault with 95% level of confidence is successfully implemented to an experimentally realized monitoring system. Emphases is made on improving the detection quality through sensor/information fusion. Acceleration, strain, and deflection measurement paths are utilized for diagnosis purposes based on experimental results.

scholarly journals Investigation of the corrosion process and destruction of metals by using acoustodamage method

2019 ◽  
Vol 121 ◽  
pp. 01017 ◽  
Author(s):  
Dmitry Tretyakov ◽  
Alexander Belyaev ◽  
Aliya Galyautdinova ◽  
Vladimir Polyanskiy ◽  
Darya Strekalovskaya
Keyword(s):  
Oil And Gas ◽  
Quantitative Relationship ◽  
Oil And Gas Industry ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Gas Industry ◽  
Acoustic Anisotropy ◽  
Industrial Alloy ◽  
Hydrogen Induced Cracking ◽  
Non Destructive

The paper presents the results of investigation of acoustic anisotropy in industrial alloy made of steel 14HGNDC after hydrogen-induced cracking (HIC) tests according to the standard NACE TM0284-2003. It was found that location and parameters of corrosion cracks with size about 20 microns can be determined by distribution and value of acoustic anisotropy. A quantitative relationship between value of acoustic anisotropy and size of corrosion cracks in the range from 60 to 6600 microns was established. The obtained results have a great importance for improving methods of hydrogen-induced cracking tests and for non-destructive testing of brittle destruction of structures in oil and gas industry by using the acoustodamage method.

scholarly journals Risk Based Inspection of Jackets Submitted to Through-Wall Cracks

2003 ◽  
Author(s):  
Franck Schoefs ◽  
Mustapha Rguig
Keyword(s):  
Decision Aid ◽  
Structural Integrity ◽  
Offshore Structures ◽  
Probability Of Detection ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Probability Of False Alarm ◽  
The Impact ◽  
Non Destructive ◽  
Rational Process

The actual challenge for the requalification of existing offshore structures through a rational process of reassessment leads to state the importance of Risk Based Inspection methodology. This paper points out the inspection results modelling and their contribution to decision aid tools. The study of the impact of through cracks on structural integrity of jacket platforms is still a challenge. The detection of large cracks is first addressed. In order to minimize inspections and maintenance costs, all the available data from inspection results, such as probability of detection and probability of false alarm, must be addressed, as well as the probability of crack presence. This can be achieved by the use of the decision theory. These capabilities of Non Destructive Testing give a first input for the risk study. A cost function is suggested to introduce this modelling into a risk analysis and is devoted to help rank the NDT tools. The case of large through-wall cracks is specifically addressed.

scholarly journals Extended Non-destructive Testing Technique Demonstration in a Realistic Environment with Technology Assessment

2021 ◽  
pp. 259-330
Author(s):  
Romain Ecault ◽  
Ana Reguero Simon ◽  
Célian Cherrier ◽  
Paweł H. Malinowski ◽  
Tomasz Wandowski ◽  
...  
Keyword(s):  
Technology Assessment ◽  
Full Scale ◽  
Probability Of Detection ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Evaluation Procedures ◽  
Structural Parts ◽  
First Time ◽  
Non Destructive ◽  
Testing And Evaluation

AbstractThis chapter highlights two advances towards a higher maturity of versatile extended non-destructive testing (ENDT) procedures. Full-scale demonstration tests are presented in realistic user application cases that involve typical production or repair scenarios. Subsequently, the investigations used to assess the probability of detection (POD) are detailed for the respective ENDT processes and application-relevant scenarios in a realistic environment. Although some results indicated that some additional in-depth investigations would be even more enlightening, these demonstrations still clearly showed that developments and progress described in the previous chapters have enabled some of the technologies to achieve a maturity that is sufficient to proceed towards industrial implementation. Some ENDT techniques revealed the presence of contaminants on real structural parts with unknown contaminant amounts. For the first time, POD results obtained for ENDT investigations are presented. Some ENDT procedures permitted POD results to be obtained for several scenarios, while others showed technologically relevant POD only for certain scenarios. For two ENDT techniques, determining the POD helped to enhance the respective testing and evaluation procedures. In most of the cases, it was possible to estimate a preliminary quantification of POD by giving the POD90/95. For some techniques, this value was below the lowest contamination degree.

Review of statistical methods for assessing the probability of detecting defects in non-destructive testing

NDT World ◽  
2021 ◽  
pp. 4-14
Author(s):  
Vasiliy Chertischev ◽  
Mihail Dalin ◽  
Aleksandr Boychuk ◽  
Ivan Krasnov
Keyword(s):  
Bayesian Statistics ◽  
Statistical Methods ◽  
Nonlinear Models ◽  
Probability Of Detection ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Nonparametric Models ◽  
Box Cox Transformation ◽  
Non Destructive ◽  
Insight Into

The probability of detection (POD) depends on defects size and is an integral part of calculating the resource during non-destructive testing of parts. This article provides an overview of well-established statistical methods for estimating PODs, with a little historical insight into their emergence. An overview of new advances in POD calculation in recent years is given: three- and four-parameter models; nonparametric models; planning the experiment and sampling of defects; applying defect modeling to reduce the number of samples; the application of the Box-Cox transformation; the influence of the variability of the initial data on the result; application of Bayesian statistics. An overview of the tasks that POD specialists still have to solve in the future: nonlinear models, modeling in conjunction with Bayesian statistics, etc

FORUM «TERRITORY OF NDT» 2020

2020 ◽  
pp. 51-63
Author(s):  
B. V. Artemiev ◽  
D. I. Galkin ◽  
V. I. Matveev ◽  
G. V. Zusman ◽  
A. V. Kovalev
Keyword(s):  
Oil And Gas ◽  
Publishing House ◽  
Technical Conference ◽  
Information Support ◽  
Technical Diagnostics ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Russian Scientific ◽  
Analytical Review ◽  
Non Destructive

A brief analytical review of the events of the VII International Industrial Forum “NDT Territory. Non-Destructive testing. Tests. Diagnostics” and the “XXII Аll-Russian Scientific and Technical Conference on Non-Destructive Control and Technical Diagnostics” held simultaneously with it. All events were held at the Expocenter Central Exhibition Complex in Moscow. The exhibition of instruments and tools of NK and TD was accompanied by a business program. Within the framework of the forum, round tables were held on topical issues of non-destructive testing and technical diagnostics. The exhibition was attended by more than 57 companies, and information support was provided by a number of news agencies, including the “Spectrum Publishing House” and “RIA Standards and Quality” (“World of Measurement” magazine). In addition to equipment for non-destructive testing and technical diagnostics, modern test equipment, testing and analytical equipment begins to appear on the stands of exhibitors. This year there was a focus on hightech solutions for engineering, metallurgy, oil and gas and other industries. The final of the competition for NK specialists and the award ceremony took place. For the first time, the “Salon of Innovations and Startups 2020” was organized at this Forum, in which representatives of 20 organizations took part. The forum demonstrated a high technical level of non-destructive testing, their metrological support, as well as certification and standardization.

Исследование выявляемости поверхностных плоскостных дефектов ультразвуковым методом с применением волн Рэлея

2021 ◽  
Vol 6 ◽  
pp. 26-34
Author(s):  
Н.П. Алешин ◽  
Н.В. Крысько ◽  
С.В. Скрынников ◽  
А.Г. Кусый
Keyword(s):  
Experimental Studies ◽  
Signal Amplitude ◽  
Probability Of Detection ◽  
Non Destructive Testing ◽  
Electromagnetic Acoustic Transducer ◽  
Destructive Testing ◽  
Testing Method ◽  
Acoustic Transducer ◽  
Non Destructive ◽  
Planar Flaw

The issues of detecting operational surface planar flaws by the ultrasonic non-destructive testing method with the use of Rayleigh surface waves generated by an electromagnetic-acoustic transducer are considered. The paper presents experimental studies of planar defects detection, simulated by an artificial reflector of the "notch" type with different width, depth and angle of inclination. The dependences of the signal amplitude on the listed parameters are constructed and their character was estimated. The optimal amplitude models for constructing the probability of detection curves (PoD) have been determined. A conclusion is made about the minimum dimensions of an operational planar flaw detected by the considering method with a probability of 90%, taking into account the confidence interval of 95%.

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