Abstract
The paper presents the study of the influence of mechanical damage on the safe operation of gas transmission pipelines. The main types of pipeline damage with the actual parameters and their influence on the operational parameters are analysed. The damaged fractures of the section of the pipeline Kaunas (Lithuania)–Kaliningrad (Russia) were investigated in the laboratory. The main operational characteristics and the structure of the pipeline’s metal after the period of long-term operation were determined using various research and experimental methods. The influence of the pipeline’s damage was modelled by using the Finite Element Method and the ANSYS code. The predictions of the failure pressure were made, taking into consideration the actual properties of the pipeline’s metal. Techniques including the hardness and microhardness measurement, chemical analysis, the impact strength test, and metallography analysis with an optical microscope, were used in the experimental study.
Highlights
Lithuania has a well-developed gas pipeline network, which is continuously being improved.most of the gas transmission pipelines were laid when Lithuania was a part of the SovietUnion
Most of the gas transmission pipelines were laid when Lithuania was a part of the Soviet
Most of the pipes used for the trunks in the Soviet Union were the first- generation pipes made of normalised steel 17G1S GOST 19281-73 (1970s) [3]
Summary
Lithuania has a well-developed gas pipeline network, which is continuously being improved.most of the gas transmission pipelines were laid when Lithuania was a part of the SovietUnion. Lithuania has a well-developed gas pipeline network, which is continuously being improved. Most of the gas transmission pipelines were laid when Lithuania was a part of the Soviet. In the European Union, some of the trunks were laid underground. The total length of the gas pipelines in the Soviet Union in 1970 was 70 thousand kilometres, while in 1986, it reached 174 thousand kilometres [1,2]. Most of the pipes used for the trunks in the Soviet Union were the first- generation pipes made of normalised steel 17G1S GOST 19281-73 (1970s) [3]. The second-generation pipes were made of the improved (carbide-hardened) steel of grades 17G2SF or 17G2SAF GOST 19281-73
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