Non-Destructive Evaluation of Composite Pipes and Tanks: Development of Inspection Strategies

2004 ◽  
Author(s):  
Harald Thon ◽  
Bjo̸rn Melve
Keyword(s):  
Ultrasonic Testing ◽  
Visual Inspection ◽  
Practical Experience ◽  
Radiographic Examination ◽  
Visual Examination ◽  
The Public ◽  
Research Programmes ◽  
Composite Pipes ◽  
Non Destructive

The document describes practical experience gained from several research programmes and the use of GRP products both offshore and onshore. An OLF document was compiled during 1990’s and the visual inspection part of the document was used in the ISO 14692, part 4 [12] with requirements and defect criteria. Additional parts on ultrasonic and radiographic examination have been included in the Norwegian standard Norsok M-622 [1]. However, we would like to publish the full version of this document and make it available in the public domain. Some of the methods described is well developed, while others still would require research efforts to make the techniques practical useful. For practical use, the visual examination with failure description, acceptance criteria and corrective actions are most developed. Further, radiography has been useful in several projects in assessing the quality of adhesive joints. The ultrasonic testing is expected to become better to use as the equipments and methods are developing. Every reasonable effort has been made to ensure that this publication is based on the author’s best knowledge. However, no responsibility of any kind for any injury, delay, loss or damage can be accepted for parties using information given herein.

scholarly journals Laboratory Study on Non-Destructive Evaluation of Polyethylene Liquid Storage Tanks by Thermographic and Ultrasonic Methods

CivilEng ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 823-851
Author(s):  
Amir Behravan ◽  
Matthew M. deJong ◽  
Alexander S. Brand
Keyword(s):  
Ultrasonic Testing ◽  
Visual Inspection ◽  
Phased Array ◽  
Road Maintenance ◽  
Storage Tanks ◽  
Ultrasonic Methods ◽  
Liquid Storage ◽  
Non Destructive Evaluation ◽  
Deicing Chemicals ◽  
Non Destructive

High-density polyethylene (HDPE) above-ground storage tanks (AST) are used by highway agencies to store liquid deicing chemicals for the purpose of road maintenance in the winter. A sudden AST failure can cause significant economic and environmental impacts. While ASTs are routinely inspected to identify signs of aging and damage, current methods may not adequately capture all defects, particularly if they are subsurface or too small to be seen during visual inspection. Therefore, to improve the ability to identify potential durability issues with HDPE ASTs, additional non-destructive evaluation (NDE) techniques need to be considered and assessed for applicability. Specifically, this study investigates the efficiency of using infrared thermography (IRT) as a rapid method to simultaneously examine large areas of the tank exterior, which will be followed by closer inspections with conventional and phased array ultrasonic testing (UT) methods. Results show that IRT can help to detect defects that are shallow, specifically located within half of the tank’s wall thickness from the surface. UT has the ability to detect all defects at any depth. Moreover, phased array UT helps to identify stacked defects and characterize each defect more precisely than IRT.

scholarly journals Design and Experimental Evaluation of an Aerial Solution for Visual Inspection of Tunnel-like Infrastructures

2022 ◽  
Vol 14 (1) ◽  
pp. 195
Author(s):  
Bianca Bendris ◽  
Julián Cayero Becerra
Keyword(s):  
Visual Inspection ◽  
Surface Coverage ◽  
State Of The Art ◽  
Visual Examination ◽  
Railway Tunnel ◽  
Trajectory Length ◽  
Planning Algorithm ◽  
Inspection And Maintenance ◽  
Path Planning Algorithm

Current railway tunnel inspections rely on expert operators performing a visual examination of the entire infrastructure and manually annotating encountered defects. Automatizing the inspection and maintenance task of such critical and aging infrastructures has the potential to decrease the associated costs and risks. Contributing to this aim, the present work describes an aerial robotic solution designed to perform autonomous inspections of tunnel-like infrastructures. The proposed robotic system is equipped with visual and thermal sensors and uses an inspection-driven path planning algorithm to generate a path that maximizes the quality of the gathered data in terms of photogrammetry goals while optimizing the surface coverage and the total trajectory length. The performance of the planning algorithm is demonstrated in simulation against state-of-the-art methods and a wall-following inspection trajectory. Results of a real inspection test conducted in a railway tunnel are also presented, validating the whole system operation.

scholarly journals IDENTIFIKASI CACAT LASAN FCAW PADA FONDASI MESIN KAPAL MENGGUNAKAN METODE ULTRASONIC TESTING

2021 ◽  
Vol 5 (2) ◽  
pp. 53-58
Author(s):  
Fauzi Widyawati ◽  
Lino Marano
Keyword(s):  
Weld Metal ◽  
Ultrasonic Testing ◽  
Slag Inclusion ◽  
Incomplete Fusion ◽  
Solid Objects ◽  
Porosity Defects ◽  
The Difference ◽  
Non Destructive ◽  
Welding Position

Ultrasonic testing is one of the non-destructive inspection methods for welding results. The ultrasonic testing method has several advantages, namely it can be used to analyze the position of the defect in the object, both the depth of the defect and the dimensions of the defect, and it is an environmentally friendly method. Physical defects that are in solid objects of course cannot be known from direct vision so it is necessary to carry out an inspection of an object to see whether or not there are defects that occur in solid objects. Ultrasonic testing of the results of FCAW welding on the foundation of the ship's engine. FCAW welding is applied to the foundation with two types of welding positions, namely the overhead position coded P1 and the horizontal position coded P2. The test was carried out using a wave frequency of 4 MHz and using a 0° probe for analysis of defects in the area around the weld metal and a 70° probe for analysis of the weld metal. The tests were carried out using the ASME section V and ASTM E164 standards as the standard for determining defects. The test results at the P1 welding position found two types of defects, namely incomplete fusion defects with five welding points with the longest defect length of 40mm and porosity defects with two points with the longest defect length of 30mm. While the results of ultrasonic testing at the P2 welding position found two types of defects, namely slag inclusion defects with a defect length of 35mm and incomplete penetration defects with a defect length of 20 mm. The conclusion of ultrasonic testing is that the difference in welding positions is that the welding position greatly affects the quality of the welding results. The defects resulting from the welding position also vary.

Assessments of User Comments With “Alternative Views” as a Function of Media Trust

2020 ◽  
pp. 1-12
Author(s):  
Marlene Kunst
Keyword(s):  
Online Discussions ◽  
Future Research ◽  
Political Issues ◽  
Argument Quality ◽  
The Public ◽  
Mainstream Media ◽  
User Comments ◽  
Media Trust ◽  
Heuristic Information Processing

Abstract. Comments sections under news articles have become popular spaces for audience members to oppose the mainstream media’s perspective on political issues by expressing alternative views. This kind of challenge to mainstream discourses is a necessary element of proper deliberation. However, due to heuristic information processing and the public concern about disinformation online, readers of comments sections may be inherently skeptical about user comments that counter the views of mainstream media. Consequently, commenters with alternative views may participate in discussions from a position of disadvantage because their contributions are scrutinized particularly critically. Nevertheless, this effect has hitherto not been empirically established. To address this gap, a multifactorial, between-subjects experimental study ( N = 166) was conducted that investigated how participants assess the credibility and argument quality of media-dissonant user comments relative to media-congruent user comments. The findings revealed that media-dissonant user comments are, indeed, disadvantaged in online discussions, as they are assessed as less credible and more poorly argued than media-congruent user comments. Moreover, the findings showed that the higher the participants’ level of media trust, the worse the assessment of media-dissonant user comments relative to media-congruent user comments. Normative implications and avenues for future research are discussed.

Trust in the Police: Cross-country Comparisons

2012 ◽  
pp. 24-47
Author(s):  
V. Gimpelson ◽  
G. Monusova
Keyword(s):  
Public Opinion ◽  
Public Attitudes ◽  
Crime Rates ◽  
Authoritarian Regimes ◽  
Data Sets ◽  
The Public ◽  
Positive Attitudes ◽  
Cross Country ◽  
Police Activity

Using different cross-country data sets and simple econometric techniques we study public attitudes towards the police. More positive attitudes are more likely to emerge in the countries that have better functioning democratic institutions, less prone to corruption but enjoy more transparent and accountable police activity. This has a stronger impact on the public opinion (trust and attitudes) than objective crime rates or density of policemen. Citizens tend to trust more in those (policemen) with whom they share common values and can have some control over. The latter is a function of democracy. In authoritarian countries — “police states” — this tendency may not work directly. When we move from semi-authoritarian countries to openly authoritarian ones the trust in the police measured by surveys can also rise. As a result, the trust appears to be U-shaped along the quality of government axis. This phenomenon can be explained with two simple facts. First, publicly spread information concerning police activity in authoritarian countries is strongly controlled; second, the police itself is better controlled by authoritarian regimes which are afraid of dangerous (for them) erosion of this institution.

Video Profile Sebagai Media Penunjang Promosi Pada Sdk Penabur Gading Serpong

CCIT Journal ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 149-157
Author(s):  
Dewi Immaniar Desrianti ◽  
Giandari Maulani ◽  
Dana Krisdiana
Keyword(s):  
Marketing Strategy ◽  
Research Methods ◽  
Needs Analysis ◽  
Media Production ◽  
Promotional Effort ◽  
The Public ◽  
Adobe Photoshop ◽  
Support Information

The tight competition between schools in the era of globalization today, requires that the school Ivory Serpong Sower SDK to do the marketing strategy as attractive as possible, in order to enhance the new prospective learner interests as well as improve the quality of and professionalism in the management of the school. It is a promotional effort is used to market products or services to the public, so that they are more familiar with or know the product or service being marketed. Current media information and promotions that use the SDK Sower Ivory Serpong still be printed in the form of banners, brochures and more, so there are still many who have not yet learned about SDK Sower Gading Serpong. The purpose of this research is to inform and promote school SDK Sower Ivory Serpong. Based on a needs analysis is required of media promotion in the form of a video profile, to support information and promotion more attractive and effective by using the software Adobe Premier and Adobe Photoshop. Research methods used namely collecting data through observation, interviews and literature studies, Media Production and concept i.e. preproduction, production and postproduction. Through the design of Video media Profile of this SDK Sower Ivory Serpong can better known to many people and attracting parents to enroll his son in schools � SDK Sower Ivory Serpong

Sign in / Sign up

Export Citation Format

Share Document