Taking into Account the Initial Signs of Critical Degradation of a Chimney in the Analysis of the Risk of Its Destruction

Vladimir Akatev; L. V. Volkova; M. P. Tyurin; E. S. Borodina

doi:doi:10.12737/article_5cf6646e9e17c2.03590798

UDC 50

Taking into Account the Initial Signs of Critical Degradation of a Chimney in the Analysis of the Risk of Its Destruction

Published в Safety in Technosphere · Volume 7, Issue 4, 2018 · Pages 11–16 · Rubrics: Control and monitoring

DOI 10.12737/article_5cf6646e9e17c2.03590798

Received: 25.08.2018 Accepted: 25.08.2018 Published: 25.08.2018 Language of publication: RUS

Authors

Vladimir Akatev ¹ · L. V. Volkova ² · M. P. Tyurin ³ · E. S. Borodina ⁴

1 Bauman Moscow State Technical University (Professor)

2 Bauman Moscow State Technical University (Senior Lecturer)

3 Moscow State University of Design and Technology (Professor)

4 Moscow State University of Design and Technology (Senior Lecturer)

ABSTRACT

The analysis of the dynamics of the corrosion processes of the lining and concrete trunk of the chimney, depending on the operating conditions and climatic conditions, reveals the conditions for the formation of initial cracks in the lining, the dynamics of their growth, it is shown that, with a density of hair cracks of 10 pieces on an area of 0.5 m2, so permeable that the rates of local corrosion processes of lining and concrete materials create an excessive risk of destruction of the chimney. Especially quickly the degradation processes the chimney is exposed at a point about one-third of the top at gas velocities below 10 and above 20 m/s. Excessive permeability of the lining as an additional critical defect is suggested to be taken into account in the composition of critical defects in the traditional classification of their hazards, and its identification is to be based on the results of recognition of defects in photographs obtained by monitoring the chimney with an autonomous device — by the parameter “exceeding the density of cracks by opening width 1 mm and more than 10 pieces on an area of 0.5 m2. At the same time, in the analysis of the risk of destruction of the chimney, the event tree is complemented by the fourth branch, which means the emergence of a critical defect — excessive permeability of gases through the lining. In addition, the lengths of cracks in the lining and concrete trunk are referred to the diameter of the pipe, which makes the classification more universal.

KEYWORDS

chimney corrosion of concrete lining permeability event tree in flaw detection

Information References

Authors:

1. Bauman Moscow State Technical University (Professor)

2. Bauman Moscow State Technical University (Senior Lecturer)

3. Moscow State University of Design and Technology (Professor)

4. Moscow State University of Design and Technology (Senior Lecturer)

Type:

Article

Pages:

from 11 to 16

Status:

Published

Subject area:

UDC 50

Language:

Russian, English

Keywords:

chimney, corrosion of concrete, lining permeability, event tree in flaw detection

References

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