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Metodik för identifiering av T-stycke med risk för termisk utmattning
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
2014 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
Abstract [sv]

Thermal fatigue is a serious problem in todays power plants. A large amount of damages around the world circles around that subject. The damage can come from the mechanism of two flows mixing with different temperatures in a T-junction. It is a fundamental prerequisite that these T-junctions are frequently tested for damages. An amount of criterias steers the rate of testings. This guide/document will provide the process of rating the T-junctions resistance with valid information and ease the course. If a T-junction is stated as very sensetive for thermal fatigue, it will be graded with a low damage index. This value is reliant of the temperature difference between the two flows and can be changed with different actions, for example by adding a mixer to the T-junction. The mixer will blend the two flows so the thermal fatigue reduces or doesn’t occour at all. The T-junction can be tested with several methods, ultra sonic testing or eddy-current testing. The ultra sonic testing method is the most used method and can test the inside of the T-junction pipe without access of the inside.

Place, publisher, year, edition, pages
2014. , 30 p.
Keyword [sv]
T stycke T junction thermal fatigue termisk utmattning
National Category
URN: urn:nbn:se:uu:diva-227433ISRN: UTH-INGUTB-EX-KKI-2014/01-SEOAI: oai:DiVA.org:uu-227433DiVA: diva2:729506
External cooperation
Forsmark Kraftgrupp AB
Educational program
Bachelor Programme in Nuclear Engineering
Available from: 2014-09-01 Created: 2014-06-26 Last updated: 2014-09-01Bibliographically approved

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LidholmLundbergExjobb.pdf(2099 kB)154 downloads
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Lidholm, Oskar
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Department of Physics and Astronomy

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