Published on 12 January 2018
For the mountain territories of the North Caucasian region experiencing the unfavorable demographical situation, gasification becomes the most effective stimulus promoting the growth of newly erected buildings, increase of tourists stream, simplifying the private subsidiary house holding leading to the reduction of the population migration from the mountain and foothill villages. The pipeline building in the mountain area is considered to be the most complex process in the technological and organizational terms. The mountain area refers to the territories with the especial natural technogenic conditions and the pipelines construction requires the maintenance of the special building norms and safety rules. The mountain landscape is continuously changing under the natural and technogenic factors impact which should be taken into consideration during the pipeline design as the stressed – deformation state of the pipeline wall metals also changes. The main pipelines being under the impact of the aggressive at – pipe medium and suffering the static and dynamic loads are the hazardous productive objects as in the process of their long exploitation they are broken resulting in the heavy economic and ecological consequences. Taking into account the above mentioned information, the problem of the technical and ecological safety provision of the gas lines operating the mountain areas under the multifactor negative impacts is considered to be an actual research – practical task, the decision of which is possible only using the method of the multifactor processes laboratory modeling and creating the program complex of the risk control for the systems. The geological processes impact in the mountains on the pipe metals deformation development in the surface layers was studied and the surface cracks in the cyclic tests were experimentally investigated. The authors conducted the researches of the cyclic crack – stability of the low – alloyed steels (x70) during the simultaneous affect of the aggressive medium and mechanical loads. The obtained data have the practical importance and allow to compare the aggressive medium impact on the corrosion speed and cyclic crack – resistivity loss degree, i. e. to trace the character of dependency between corrosion stability and metal worn – out. The dependence of stress impact in the pipes on the cracks development speed was experimentally obtained and the recommendations in terms of the working stresses reduction in the pipelines walls were elaborated.
Tags: напряженно- деформированное состояние, газопровод, коррозионно-механическая повреждаемость, рост трещин
ISSN 1998-4502 (Print) ISSN 2499-975Х (Online)