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Termoelektrana Kakanj , Kakanj , Bosnia and Herzegovina
Institute "Kemal Kapetanović" Zenica, University of Zenica , Zenica , Bosnia and Herzegovina
Maneco Kakanj , Kakanj , Bosnia and Herzegovina
In order to examine the state of critical components of the boiler of Unit 5 of Kakanj Thermal
Prema wer Plant, headers were tested in order to undertake appropriate technological measures
and activities on the basis of insight into the current state of affairs, and to make
recommendations for further exploitation. From first commissioning in 1969 to 30 April 2019 the
Unit 5 boiler had 271.403 operating hours in operation and was designed for 100.000 hours.
During the exploitation so far, several modifications and revitalizations have been carried out on
the block, although some components from the installation period are still in operation
(superheater headers Pr 5 and Pr 6). The testing program was made on the basis of analysis and
evaluation of the results from previous tests and records of performed repairs on the tested
components (repair of individual cracks on welded joints, created during exploitation in the
previous period). The paper presents the most important data on past exploitation, the results of
the NDT tests, as well as the hardness and structure tests on the replicas.
Material condition assessments of critical components of Pr 5 and Pr 6 superheaters, unit 5
boiler, and recommendations for further exploitation were made based on NDT tests, as well as
hardness and structure tests, in accordance with prescribed, norms and applicable standards, and
structural degradation assessment and the hardness drop from the commissioning of the block to
the tests carried out in the course of this work on the same or similar components.
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