AUTOMATED ULTRASONIC TESTING FOR PIPELINE GIRTH WELDS PDF

Full colour printed textbook of Automated Ultrasonic Testing for Pipeline Girth Welds for NDT cover. : 3This. The use of ultrasonics to test pipeline girth welds during pipeline today, the use of automated ultrasonic testing (AUT) of girth welds is becoming increasingly. This page book provides an overview of the principles of automated ultrasonic testing (AUT) of girth welds, and explains the many parameters that influence.

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Furthermore challenges regarding the use of AUT on Austenitic welding having a corrosion-resistant alloy layer are presented.

It is also important that users get the best economic benefit from the new technology and this means using the capability of ultrasonics to define the size of ;ipeline defects that are found. Automated ultrasonic testing AUT is globally seen as more than just an alternative to the standard radiographic inspection technique not only because it does not poses safety hazards but also because it is faster, more reliable and has better detection capabilities of critical Lack of Fusion defects in pipeline girth welds.

Alternatively, such a defect could be assessed with an additional length added equal to the width of the pipe seam weld i. Challenges of seamless pipe inspection Due to their variable wall thickness, inspecting seamless pipes with AUT can be a tedious process.

Cracking, transverse to the direction of welding, was also simulated. A wide range of defect types and condition was specified for specialised welding contractors to insert into the welds during their fabrication.

Each configuration is color coded for easy viewing. The nine welds amounted to 35 metres of weldment. If an engineering critical assessment ECA specification were to be used, however, the repair rate was shown to drop substantially, with the potential for significant cost savings.

Automated Ultrasonic inspection of Girth Welds in Seamless Pipes with the Olympus PipeWIZARD

If any company had attempted to achieve good detection by over-reporting this would give spurious indications that would be evident. Journal home Journal issue About auutomated journal.

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These are not included in the cost of shipping or handling of your order. This means there was a considerable length of non-defective weld. Already have an account? The detection of these defects is not covered in standards and an industry initiative to improve this aspect may be warranted. Due to their variable wall thickness, inspecting seamless pipes with AUT can be a tedious process.

The Detection of Copper. No trend was evident to suggest that either better or worse results were obtained with the phased arrays. Some of the defects were cut open to confirm their nature and size. Adequate time was given to each AUT company to ensure that they would not be pressured by time.

While the basic approach is similar from most suppliers, there are significant differences as well as new developments in response to the demands of the marketplace.

This is illustrated in the table below. Nine butt welds were fabricated in 48 inch mm diameter, X80 grade, pipes using two mechanised welding systems. Some variations are apparent in the performance of different operators and companies and an on-the-job testing of operator competence has been proposed as this is such a crucial element of the operation.

The early AUT systems used probes to focus beams of ultrasound onto zones along the weld fusion line. It was decided to conduct a trial of several AUT systems to establish the capabilities. Following the positive results of this work the practical aspects of using AUT have been evaluated during construction of a new pipeline in Scotland in About half the AUT companies missed the external slot in the J-prep.

Automated Ultrasonic Testing for Pipeline Girth Welds This book provides an overview of the principles involved in automated ultrasonic testings of girth welds as well as presents some of the origins and many parameters that influence the results of these inspections.

The start of a defective area was shown to be detected earlier by the AUT in many of the defects that were sectioned e. Every indication noted on both records was entered onto a database, of a substantial size. These radiographs were analysed by four independent, qualified interpreters. For example, with the same specification the repair rates using AUT or RT were shown to be comparable.

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After being welded, the welds were inspected using panoramic X-radiography. The plan of work Nine butt welds were fabricated in 48 inch mm diameter, X80 grade, pipes using two mechanised welding systems. Usually the AUT systems are mounted on a band strapped around the pipe.

Nearly 90 defects were used; eight inspections from seven companies thus gave a reasonable statistical set of data. This paper describes also latest improvements made on AUT during the last years in order to optimize inspection philosophy and minimize the system’s “Uncertainties”.

The results confirmed that very good detection performance is available from AUT systems generically.

Automated Ultrasonic inspection of Girth Welds in Seamless Pipes with the Olympus PipeWIZARD

TRIALS The two pipe spools were located with good access and good facilities in terms of comfort — a dry working environment with light, power and water.

When considering the deficiencies of AUT, it should be remembered that RT is by no means a perfect inspection system to compare it with. These welds contained a range of deliberately made defects. The issues surrounding the accuracy of size evaluation and further work needed in this area is discussed.

An on-the-job test of operator competence has been proposed for Igrth operations, much as is done for welders. The AUT systems on trial have produced inspection results that compare well with radiography, with good detection except for isolated pores and inclusions.

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Transverse defects are not detected reliably. To analyze automatrd data, the operator chooses the appropriate view to display based on the wall thickness measurement of the pipe that was acquired by each phased array probe during the scan.

Store Online Store Home. Utilizing the wall thickness variation tool for welds in seamless pipes ensures that welds are inspected with a high degree of precision.

This is illustrated in figure.