Comparison of failure analysis on reheater and waterwall tube power plant base on outer surface

Visual observation on waterwall tube failure showed crack at the outer surface and fish mouth on reheater tube. An analysis of this research is to compare the causes of failure of waterwall and reheater tube boiler. Method of this used descriptive qualitative with macro and micro visual observation....

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2021-02, Vol.1034 (1), p.12163
Main Authors: Drastiawati, Novi Sukma, Soekrisno, R., Kis Agustin, H.C., Arsana, I Made
Format: Article
Language:English
Subjects:
Boiler tubes
Creep (materials)
Electric power generation
Failure analysis
Intergranular fracture
Visual observation
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Summary:Visual observation on waterwall tube failure showed crack at the outer surface and fish mouth on reheater tube. An analysis of this research is to compare the causes of failure of waterwall and reheater tube boiler. Method of this used descriptive qualitative with macro and micro visual observation. Crack appeared from the outside waterwall tube occurred at a place attached to the oxide layer, it indicated that failure on this tube achieved in long period. The small crack as a place for new oxide layer and corrosive media. Larger crystal grains at the edge of the oxide layer and tip of crack because the corrosion reaction between oxides and metal, it produces local heat on the area. Failure on reheater tube was presence of scale attached on the outer caused differences in the distribution of temperature between inner and outer surface tube.The dominant factor of this failure occurred intergranular creep fracture. The results shows that main mechanism on waterwall tube failure is physical and mechanical factor on reheater tube.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/1034/1/012163