Estimation of Correct Long-Seam Mismatch Using FEA to Compare the Measured Strain in a Non-Destructive Testing of a Pressurant Tank

2021 ◽  
Vol 4 (1) ◽  
pp. 16-28
Author(s):  
Chitaranjan Pany
Keyword(s):  
Strain Curve ◽  
Design Criterion ◽  
Engineering Problem ◽  
Destructive Testing ◽  
Element Analysis ◽  
Experimental Stress Analysis ◽  
Pressure Test ◽  
Steel Tank ◽  
Measured Strain ◽  
Non Destructive

This paper discusses the design criterion of a pressurant steel tank made of HSLA 15CDV6 and proof pressure test (PPT) as a non-destructive examination. An inverse Ramberg-Osgood relation is used to represent the stress-strain curve of the material. Elasto-plastic finite element analysis (FEA) has been carried out to examine the adequacy of the design. Experimental stress analysis has been carried out from the measured strains and found maximum effective stress is at LS joint (max. measured strain location). Strain obtained from FEA is compared reasonably well with the proof pressure test (PPT) data at most of the strain gauge locations except at one long-seam (LS) joint. So, to explain the causes of difference in strains near one LS, parametric studies have been performed in a 3D FEA with varying LS mismatch to find the correct mismatch as a reverse engineering problem. It is found that a mismatch value of 0.9 mm will give the required strain at PPT, which is measured only 0.4 mm. The failure pressure estimated through nonlinear FEA/analytical expressions found to meet the design.

New Environmentally Friendly Solutions to Prevent Oil Pipelines Disasters

2015 ◽  
Vol 797 ◽  
pp. 334-344
Author(s):  
Michał Bardadyn ◽  
Marcelo Paredes ◽  
Mateusz Wrobel ◽  
Krystian Paradowski ◽  
Andrzej Zagórski ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Surrounding Medium ◽  
Operating Conditions ◽  
Small Samples ◽  
Destructive Testing ◽  
Element Analysis ◽  
Qualified Personnel ◽  
Oil Pipelines ◽  
Pipeline Networks ◽  
Non Destructive

In this paper a newly environmental friendly Non-Destructive Testing (NDT) method for underground oil and gas pipeline networks is proposed. A suitable equipment extracts small samples of material from installed buried pipes for mechanical testing. Numerical calculations using Finite Element Analysis (FEM) proves that decreasing wall-thickness pipes is safe for in-field operating conditions. Nevertheless, those locations from where samples are cut should be monitored. For instance by means of Acoustic Testing (AT) system. New way of placing sensors is proposed. Sensors are introduced inside the pipe so that any acoustic wave changes from surrounding medium can be measured. In this type of AT a straightforward procedure must be followed to install sensors on pipe. Therefore, there is no need to uncover tested areas with qualified personnel. The research showed that the signals recorded from internal sensors are comparable to those results extracted from external ones. The study also revealed lower vulnerability to acoustic interference of the sensor placed inside the pipeline.

Evaluation of near-drum thinning data in recovery boiler generating bank tubes

TAPPI Journal ◽  
2016 ◽  
Vol 15 (7) ◽  
pp. 491-500
Author(s):  
W.B.A. SANDY SHARP ◽  
W.A. BILLY JONES
Keyword(s):  
Finite Element Analysis ◽  
Thickness Measurement ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Element Analysis ◽  
Data Set ◽  
Industry Standard ◽  
Recovery Boiler ◽  
Thickness Measurements ◽  
Non Destructive

Near-drum thinning affects the fireside surface of recovery boiler generating bank tubes near the surface of the mud drum. Although sophisticated thickness scanning equipment has been developed to rapidly make tens of thousands of thickness measurements in the portion of a tube that is vulnerable to near-drum thinning, methods for using these data to evaluate fitness-for-service have not shown similar advances. Non-destructive testing companies typically use a technician’s subjective judgment to identify the “thinnest reliable" thickness measurement on each tube. Some mills decide whether tubes can continue in operation or should be plugged or replaced based on this single thickness measurement. However, finite element analysis of the remaining strength of individual tubes thinned in the near-drum area suggests that it is essentially impossible to identify the weakest tubes from simple empirical rules. In the absence of an industry standard for evaluating these data, different mills could reach different conclusions about the fitness-for-service of a tube from the same data set. This paper reviews the technology for scanning the thickness of generating bank tubes and discusses approaches that have been used to identify the tubes most weakened by near-drum thinning and to evaluate the fitness-for-service of individual tubes.

What Optical Metrology Can Do for Experimental Mechanics ?

2011 ◽  
Vol 70 ◽  
pp. 1-20
Author(s):  
Wolfgang Osten
Keyword(s):  
High Sensitivity ◽  
Fast Response ◽  
Experimental Mechanics ◽  
Optical Methods ◽  
Optical Metrology ◽  
Identification Problems ◽  
Destructive Testing ◽  
Experimental Stress Analysis ◽  
Versatile Tool ◽  
Non Destructive

Optical metrology has shown to be a versatile tool for the solution of many measurement and inspection problems. The main advantages of optical methods are the non-contact nature, the non-destructive and areal working principle, the fast response, high sensitivity, resolution and accuracy. Consequently, optical principles are increasingly being considered in many areas where reliable data about the shape, the surface properties, the state of stress and the strength of the object under test have to be acquired. However, these advantages have to be paid with some serious disadvantages that are mainly connected with the poor features of identification problems. In this article several examples are presented where optical metrology is helpful for experimental mechanics. The presentation is mainly focused on two topics: the acquisition of quantitative data for experimental stress analysis and the solution of inspection problems by holographic non-destructive testing. Some current aspects such as modern approaches for the solution of identification problems, the installation of remote laboratories and the calibration of measurement set-ups by specially engineered calibration samples are discussed finally.

Research on the Application of the Infrared Thermal Image Method in Detection of Concrete Density of Concrete-Filled Steel Tube

2012 ◽  
Vol 166-169 ◽  
pp. 998-1001
Author(s):  
Rong Xu ◽  
Dahao Jiang ◽  
Xuewei Lu
Keyword(s):  
Steel Tube ◽  
Thermal Image ◽  
Image Method ◽  
Non Destructive Testing ◽  
Tubular Structures ◽  
Destructive Testing ◽  
Element Analysis ◽  
Concrete Filled Steel Tube ◽  
Non Destructive ◽  
Initial Exploration

With the extensive application of concrete-filled steel tubular structures, much attention has been paid to the detection of concrete density of the concrete-filled steel tube. Based on the advantages and research results of infrared thermography non-destructive testing, the paper established physical model and applied ANSYS finite element analysis module to numerical simulation of temperature field to make initial exploration on the applicability of such technology to the detection of concrete density of concrete-filled steel tube.

Effects of Magnetic Concentrator on MFL Signals Using FEA

2011 ◽  
Vol 204-210 ◽  
pp. 1956-1959
Author(s):  
Qiang Song
Keyword(s):  
Signal To Noise Ratio ◽  
Axial Component ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Element Analysis ◽  
Leakage Flux ◽  
Testing Method ◽  
Detection Schemes ◽  
Non Destructive ◽  
Flux Leakage

Magnetic flux leakage (MFL) is a non-destructive testing method used to inspect ferrous materials. However, there are a variety of factors that can affect the MFL inspection tool’s ability to detect and characterize anomalies. MFL signals obtained during the inspection of pipes have been simulated using 3D finite element analysis (FEA) and the effects of magnetic concentrator on MFL signals are investigated. Measurements of the leakage flux with various defect depths or widths indicate that the axial component of MFL are improved by magnetic concentrator with the result that significant advantages could be obtained in defect detection schemes, in that the signal to noise ratio (SNR) of MFL signals can be improved by magnetic concentrator.

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