Forum Technical Discussions      Re: Advanced UT for piping? Posted by: Nigel Armstrong (PID_728), E-mail: Address, on October 04, 2008 at 11:50 : In Reply to: Re: Advanced UT for piping? posted by : Prasad , E-mail: Address, on October 02, 2008 at 10:43 : Greetings to all, This has potential to become a very interesting thread as it highlights another problem which hinders the wider replacement of radiography by ultrasonics in the testing of pipe welds. Could we agree to keep it public by posting links etc on the forum, for our own referral and for the information of other colleagues (now and future) with similar inspection requirements. I must confess my embarassment on first reading Dao Huu Xuan's initial post as I have not heard of ABI scan before so thanks for the brief explanation, Prasad and thanks for your honesty, Michael! A cursory Google search revealed its medical origins - yes folks I am another Google NDT engineer!!! Prasad, I would be grateful if you could point me to more information regarding this technique in the industrial field, especially with reference to the difficult art of one-sided inspection (pipe to bend/flange/fitting, etc). What trials have been done using what defect types? Are there any published papers? To date my undestanding is that for a high probability of detection (POD) of smooth-sided planar defects such as lack of sidewall defects with a pulse-echo (PE) technique, the major axis of the beam should be essentially perpendicular to the expected flaw orientation, e.g. for lack of side wall fusion the bevel angle. So, for PE coverage entails insonification (sorry!) at the appropriate angle for a high POD, something which is a big problem for PE techniques on pipe to fitting joints, whereas TOFD is not orientation dependent. I have no direct experience of single-sided TOFD but, as an example, Shell Global Solutions has used it as V-TOFD to inspect weldolets, as described in the following paper: http://www.ndt.net/article/ecndt2006/doc/Fr.2.2.3.pdf There are other examples of the usage of single-sided TOFD, so I would be interested to know why you deem it impossible, Prasad. I look forward to learning more of the ABI technique's capabilities with a resulting improvement in my understanding of the difficult science of pipe-to-fitting ultrasonic inspection. Thanks gentlemen Nigel ---------- StaOriginal Message ----------- : Dear Dao Huu Xuan, : First of all the above said UT inspection methods should have been qualified at site. : Secondly ABI scan is a pulse echo method with A and B-Scan-Enhancement Imaging will be obtained through the capturing and recording of the successive unprocessed A-Scans along the scanning path or in time progress. So just like in pulse echo if you can ensure the coverage from one side using diffrent angle beam probes etc , complying to the prevailing code; it is sufficient to carry out inspection from one side : : You need to have access for emitter and receiver probes to carry out TOFD. So it is impossible to carry out TOFD from one side. : More details are required for the detailed reply : : Prasad : : Hi all, : : I have a witness an advanced UT inspection for piping 3" to 6" which is executed by a NDT service. Methodes used are ABI scan and TOFD. I was reject all scan result of joints scaned only one side. : : My questions are. : : 1. Are ABI scan and TOFD can inspect for joints pipe to fitting (L bowls and flanges) in diameter range of 3-6"? How to full coverage scan. : : 2. Which is the best equipment to inspect the above mentioned material? : : Thank you, : : Dao Huu Xuan, Vietnam ------------ End Original Message ------------ Follow Ups: Re: Advanced UT for piping? Ed Ginzel 16:30 Oct-04-2008 (1) Re: Advanced UT for piping? Prasad 11:18 Oct-05-2008 (0) Post a Followup: Name: E-Mail: Subject: Comments: ----------- Start Original Message ----------- : Greetings to all, : This has potential to become a very interesting thread as it highlights another problem which hinders the wider replacement of radiography by ultrasonics in the testing of pipe welds. Could we agree to keep it public by posting links etc on the forum, for our own referral and for the information of other colleagues (now and future) with similar inspection requirements. : I must confess my embarassment on first reading Dao Huu Xuan's initial post as I have not heard of ABI scan before so thanks for the brief explanation, Prasad and thanks for your honesty, Michael! A cursory Google search revealed its medical origins - yes folks I am another Google NDT engineer!!! : Prasad, I would be grateful if you could point me to more information regarding this technique in the industrial field, especially with reference to the difficult art of one-sided inspection (pipe to bend/flange/fitting, etc). What trials have been done using what defect types? Are there any published papers? : To date my undestanding is that for a high probability of detection (POD) of smooth-sided planar defects such as lack of sidewall defects with a pulse-echo (PE) technique, the major axis of the beam should be essentially perpendicular to the expected flaw orientation, e.g. for lack of side wall fusion the bevel angle. So, for PE coverage entails insonification (sorry!) at the appropriate angle for a high POD, something which is a big problem for PE techniques on pipe to fitting joints, whereas TOFD is not orientation dependent. : I have no direct experience of single-sided TOFD but, as an example, Shell Global Solutions has used it as V-TOFD to inspect weldolets, as described in the following paper: : http://www.ndt.net/article/ecndt2006/doc/Fr.2.2.3.pdf : There are other examples of the usage of single-sided TOFD, so I would be interested to know why you deem it impossible, Prasad. : I look forward to learning more of the ABI technique's capabilities with a resulting improvement in my understanding of the difficult science of pipe-to-fitting ultrasonic inspection. : Thanks gentlemen : Nigel : : ---------- StaOriginal Message ----------- : : Dear Dao Huu Xuan, : : First of all the above said UT inspection methods should have been qualified at site. : : Secondly ABI scan is a pulse echo method with A and B-Scan-Enhancement Imaging will be obtained through the capturing and recording of the successive unprocessed A-Scans along the scanning path or in time progress. So just like in pulse echo if you can ensure the coverage from one side using diffrent angle beam probes etc , complying to the prevailing code; it is sufficient to carry out inspection from one side : : : : You need to have access for emitter and receiver probes to carry out TOFD. So it is impossible to carry out TOFD from one side. : : More details are required for the detailed reply : : : : Prasad : : : Hi all, : : : I have a witness an advanced UT inspection for piping 3" to 6" which is executed by a NDT service. Methodes used are ABI scan and TOFD. I was reject all scan result of joints scaned only one side. : : : My questions are. : : : 1. Are ABI scan and TOFD can inspect for joints pipe to fitting (L bowls and flanges) in diameter range of 3-6"? How to full coverage scan. : : : 2. Which is the best equipment to inspect the above mentioned material? : : : Thank you, : : : Dao Huu Xuan, Vietnam ------------ End Original Message ------------ Optional Link URL: Example: "http://www....html". Alternative write "http://www.ndt.net/wshop/attach/filename.htm" if you transfered a filename.htm via FTP Page Title: is important! Optional Image URL: http://www....gif Attention! Please click the button only once. This may take a moment to process Forum Technical Discussions Help