Wojcik, A;
Waitt, M;
Santos, A;
Shibli, A;
(2022)
Current progress in the use of potential drop for condition monitoring of creep in high temperature/pressure industrial plant.
In:
Proceedings of the 18th International Conference on Condition Monitoring and Asset Management (CM 2022).
(pp. pp. 363-385).
British Institute of Non-Destructive Testing (BINDT)
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Abstract
Electrical potential drop is a well-established method for laboratory crack growth measurement and in-field NDT. We describe here the application of the two separate variants of EPD (ACPD and DCPD) to monitor the progress of creep damage in pressure vessel materials and components, in an on-line continuous monitoring context. ACPD and DCPD have been employed by the authors in a long-term programme, over 4 years, carried out on a range of specimens and vessels. The results have been very encouraging and have consistently revealed an ability to detect creep damage many months before final failure occurs, and to stop long-term tests ahead of final fracture/failure, when close to a component’s end-of-life. A variety of EPD responses have been seen in tests, making data interpretation challenging, but not impossible. EPD readings can be influenced by a variety of phenomenon, many unrelated to creep damage, so it has been necessary to develop an approach based on a “signature” of EPD data from multiple monitored locations on a particular test piece. The combination of AC with DCPD has helped deconvolute the various unrelated phenomena from that due to creep damage (which is sometimes much more subtle). We report on the methods employed, plus the practicalities of physically connecting to plant in the field, ways of ensuring long term connection efficacy and reliability, and the benefits of the combined AC/DC instrumental approach. We speculate on the possible extension of our methods to other time-dependent degradation mechanisms in industrial plant, such as HTHA and HE. The overall methodology holds great promise for condition monitoring of power-plants, pipelines and their end-of-life prediction.
| Type: | Proceedings paper |
|---|---|
| Title: | Current progress in the use of potential drop for condition monitoring of creep in high temperature/pressure industrial plant |
| Event: | 18th International Conference on Condition Monitoring and Asset Management, CM 2022 |
| ISBN-13: | 9781713862277 |
| Open access status: | An open access version is available from UCL Discovery |
| Publisher version: | https://www.bindt.org/events-and-awards/cm-2022/ab... |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10195956 |
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