18 Oct

True advancements for longitudinal weld pipe inspection in PA

Philippe Rioux, Jonathan Turcotte, Philippe Cyr

Phased Array inspection of curved parts brings some real technical challenges. Evaluation of seam welds on small diameter and heavy wall pipes is difficult to accomplish using actual tools that, most of the time, are based on a flat surface model. This often leads to erroneous and imprecise flaw location and sizes. Furthermore, interpretation of the S-Scans becomes very difficult in these circumstances. Trying to take into consideration the effect of the convex surface reflection is something the current instrument imagery is not taking into account and is very difficult for the operators to correct themselves. The typical tools like presenting an overlay of the weld just can’t be used in a practical way.
This paper presents a totally new approach of inspecting seam welds and more generally curved parts. The novel method rethinks almost all aspects of the traditional implementation. Starting from an original focalisation of beams that allows the technician to define specific focal points in a zone of interest. As well, we describe how the live data is represented in a 3D scan plan in order to facilitate interpretation and identification of flaws. Corrected A-Scan views are also produced, allowing to perform accurate measurements. We finally touch on how to calibrate the instrument prior to performing these inspections on curved surfaces.

Philippe Rioux, Jonathan Turcotte, Philippe Cyr, True advancements for longitudinal weld pipe inspection in PA

18 Oct

Case study – the study of austenitic joints for LNG terminal

Marek Śliwowski

In paper, in a frame of case study, the ultrasonic inspection of austenitic girth butt welds in storage tank of LNG terminal for the range of diameter till 60 m and thickness range 10 ÷ 40 mm was studied.
There are presented the fundamental problems arise by ultrasonic testing of austenitic coarse grained welds. The examination technique selection based on accessible knowledge, existing standards and tests on representative weld specimen is followed through in a frame of case study.
It is presented the scan plan of testing the austenitic girth welds using conventional ultrasonic system, based on the multiprobe scanning. There is presented a range and sensitivity setting on reference block manufactured on the base of representative austenitic weld with reference reflectors dedicated to each area of interest of inspected weld volume.
It is also presented the new modern solution of scanner with only two probes. Each of them is dual matrix phase –array probe working in pitch-catch mode and cold symbolic PA DMA-TRL. They are connected with phase-array apparatus controlled localization and acquisition of experimental data. There are discussed advantages such a modern examination technique reached highest level of NDT techniques.
The presented case study is an assumption formulation example of examination procedure for technically important and responsible object – like assessment of requirements agreement with technical regulations for the austenitic welds in storage tanks of liquid gas LNG.

Marek Śliwowski, Studium przypadków – badanie złączy austenitycznych na terminalu LNG

18 Oct

Development of Non-destructive Testing Technology in China

Qiang Tianpeng

This article puts forward the concept of three stages of NDT technology development in China; it also introduces the number of the NDT personnel and the issuance of certificates in China; with the special pressure equipment as the example to illustrate the scale of application of NDT technology in China; with the TOFD technology as the example to illustrate the present situation of application of new NDT technology in China; it introduces the situation of NDT instruments in China, including categories of the instrument products, number of the instrument production enterprises and the product characteristics, the instrument industrial policies of China; it introduces the universities and scientific research institutes in China that carry out NDT education and research, and their research fields, academic specialty and leaders; it introduces the present situation of NDT standards, the standard management system and number of standards, and formulation of NDT new technology standards in China; and it introduces the advanced concept on NDT put forward by Chinese scholars.

Qiang Tianpeng, Development of Non-destructive Testing Technology in China