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Vol 14, Issue 1, 2023
Pages: 158 - 166
Professional paper
Metallic materials
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Published: 01.05.2023. Professional paper Metallic materials

NDT TESTING AND DETERMINATION OF THE STATE OF THE MATERIALS OF THE HEADERS OF THE BOILER UNIT 5 IN THE THERMAL POWER PLANT KAKANJ

By
Armin Husika ,
Armin Husika

Termoelektrana Kakanj , Kakanj , Bosnia and Herzegovina

Belma Fakić ,
Belma Fakić
Contact Belma Fakić

Institute "Kemal Kapetanović" Zenica, University of Zenica , Zenica , Bosnia and Herzegovina

MIlenko Rimac
MIlenko Rimac

Maneco Kakanj , Kakanj , Bosnia and Herzegovina

Abstract

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.

References

1.
Rimac M, Kakanj TTDUM, Koro A. Energoinvest Institut za materijale i kvalitet IMQ Sarajevo, Belma Fakić Institut „Kemal Kapetanović“ Zenica, Elaborat 03-19 – Utvrđivanje stanja kritičnih komponenti kotla bloka 5 u Termoelektrani. 2019.
2.
Standard ČSN. 41 5128 - ČESKOSLOVENSKÁ STÁTNÍ NORMA, OCEL 15 128, Cr-Mo-V. JK. 1984;125 325.
3.
E.Kratina Bf. A.Husika Proces degradacije mikrostrukture materijala i uticaj na osobine u termoenergetskim postrojenjima u toku dugotrajne eksploatacije na povišenim temperaturama, VII Naučno/stručni simpozij sa međunarodnim učešćem „Metalni i nemetalni materijali. 2008;15–6.
4.
Standard DIN. 17175 – Seamless Tubes of Heat – resistant Steels. Technical Conditions of Delivery. 1979;
5.
Standard VGB-S-517-00-2014.-Guidelines for rating the microstructural composition and creep rupture damage of creep-resistance steel for high-pressure pipelines and boiler components and their weld connections.
6.
Standard ASTM A 956-method A-Standard Test Method for Leeb Hardness Testing of Steel Products. 1996;
7.
Standard DIN 50150- Testing of metallic materials - conversion of hardness values. 2000;
8.
E SASTM. 407-07-Standard Practice for Microetching Metals and Alloys. 2007;
9.
Standard BAS ISO 3057-Non-destructive testing - Metallographic replica techniques of surface examination. 1998;

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