УДК 620.19::622.691.4::678.5-9
(BACKGROUND AND CHALLENGES OF TECHNICAL DIAGNOSTICS OF UNDERGROUND POLYETHYLENE GAS PIPELINES AS PART OF THE INDUSTRIAL SAFETY EXPERT REVIEW. PART 1)
When it comes to construction of gas distribution networks, polyethylene pipelines have been proven as much better choice comparing to steel pipes. Whereas there were about 300 km of polyethylene pipelines in 1975, this number increased thousandfold by 2022. Being engaged in activities aimed at provision of safety of gas distribution networks, AO Giproniigaz conducts research and development for monitoring of serviceability status of the operated polyethylene gas pipelines. This article presents some results of the work.
The first part considers possible criteria of assessment of the first generation polyethylene pipes (commissioned before introduction of minimum required strength classification), lists the factors affecting their physical and mechanical properties, which shall be taken into account for analysis of the obtained results. It contains data of laboratory examination of pipe material after almost 35-year operation based on three criteria: tests for axial tension, polymer melt flow index, and thermal-oxidative aging resistance. It is found that determining values of thermal oxidation stability of the material in the inner, central, and outer pipe layers and comparative analysis of the obtained values may be applied to detect change of antioxidants content over time, and may serve as a criterion for assessment of polymer degradation to establish whether pipes are suitable for further operation. It is shown that plasticity is another unbiased characteristic which may be used to assess polyethylene resistance to brittle fracture and its ability to retain operational features. The article also highlights significant influence of natural gas components to mechanical and physical characteristics of pipes.
С.Н. Мартыненко, АО «Гипрониигаз» (Саратов, Россия), niigaz@niigaz.ru
Г.И. Зубаилов, к.т.н., АО «Гипрониигаз», niigaz@niigaz.ru
S.N. Martynenko, AO Giproniigaz (joint-stock company) (Saratov, Russia), niigaz@niigaz.ru
G.I. Zubailov, PhD in Engineering, AO Giproniigaz, niigaz@niigaz.ru
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