scholarly journals Effect of long-term operation on steels of main gas pipeline: Structural and mechanical degradation

2018 ◽  
Vol 30 (4) ◽  
pp. 363-367 ◽  
Author(s):  
Pavlo Maruschak ◽  
Sergey Panin ◽  
Mykola Chausov ◽  
Roman Bishchak ◽  
Ulyana Polyvana
Keyword(s):  
Gas Pipeline ◽  
Mechanical Degradation ◽  
Term Operation ◽  
Main Gas Pipeline

Effect of long-term operation on steels of main gas pipeline. Reduction of static fracture toughness

2017 ◽  
Vol 38 ◽  
pp. 182-186 ◽  
Author(s):  
P.O. Maruschak ◽  
S.V. Panin ◽  
M.G. Chausov ◽  
R.T. Bishchak ◽  
U.V. Polyvana
Keyword(s):  
Fracture Toughness ◽  
Gas Pipeline ◽  
Term Operation ◽  
Static Fracture ◽  
Main Gas Pipeline

scholarly journals DEGRADATION OF THE MAIN GAS PIPELINE MATERIAL AND MECHANISMS OF ITS FRACTURE

2014 ◽  
Vol 20 (6) ◽  
pp. 864-872 ◽  
Author(s):  
Pavlo Maruschak ◽  
Iryna Danyliuk ◽  
Olegas Prentkovskis ◽  
Roman Bishchak ◽  
Andriy Pylypenko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Deformation Process ◽  
Pipe Wall ◽  
Gas Pipeline ◽  
Static Deformation ◽  
Term Operation ◽  
Damage And Fracture ◽  
Scattered Damage ◽  
Main Gas Pipeline

The effect of the in-service scattered damage in the pipe wall metal is evaluated, and the effect of hydrogen absorbed by metal on the variation of the structure and mechanical properties of the main gas pipeline after a long-term operation is found. The main regularities in the graded nature of the static deformation process and the effect of hydrogenation on the scattered damage and fracture accumulation are found.

Study of the mechanical properties of the gas pipeline metal after long-term operation in conditions of the North

2020 ◽  
Vol 86 (6) ◽  
pp. 48-54
Author(s):  
N. I. Golikov ◽  
M. M. Sidorov ◽  
I. I. Sannikov ◽  
A. K. Rodionov
Keyword(s):  
Mechanical Properties ◽  
Residual Strength ◽  
Linear Part ◽  
Full Scale ◽  
Gas Pipeline ◽  
Term Operation ◽  
The North ◽  
Full Scale Tests ◽  
Main Gas Pipeline

The residual strength and technical condition of the material of 530-mm steel pipe (14KhGS) of main gas pipeline are estimated to ensure the safety of long-term operation of pipelines in climatic conditions of the North. The mechanical properties are determined using standard methods of mechanical testing in laboratory conditions. A full-scale pressure test up to failure is used to determine the actual values of the fracture toughness and safety factor of the pipe. Full-scale tests were carried out on a test bench, a computer-measuring complex which displayed the reaction of the object to the load. A pipe fragment was cut from the linear part of the main gas pipeline and welded with spherical plugs. The outer surface of the pipe was notched along the pipe axis. The depth of the notch was calculated such that the breaking load on the ligament section at the notch site corresponded to the working pressure of the gas pipeline. No significant changes in the mechanical properties of the pipe metal were revealed in the absence of visible corrosion and deformation damage during long-term operation of the pipe in the North. Impact tests did not reveal embrittlement of the metal of the tested pipes. Full-scale tests of a pipe with an artificially applied defect made it possible to calculate the value of the critical stress intensity factor, which allowed us to estimate the residual strength of a pipe with a longitudinal crack. The value of the strength criterion of the fracture mechanics indicates the preservation of a sufficiently high viscosity of sheet metal pipes. Similar tests of the pipes (of other size and made of other materials) operating in the main gas pipelines should be continued taking into account temperature ranges and material degradation after long-term operation.

Evaluation of the residual lifetime of a section of a main gas pipeline after long-term operation

2012 ◽  
Vol 48 (2) ◽  
pp. 231-238 ◽  
Author(s):  
O. E. Andreikiv ◽  
O. V. Hembara ◽  
O. T. Tsyrul’nyk ◽  
L. I. Nyrkova
Keyword(s):  
Gas Pipeline ◽  
Residual Lifetime ◽  
Term Operation ◽  
Main Gas Pipeline

scholarly journals Investigation of mechanical properties of the main gas pipeline material during a long-term operation in conditions of the North

2020 ◽  
Vol 30 ◽  
pp. 144-148
Author(s):  
Igor Sannikov ◽  
Nikolay Golikov ◽  
Nikolay Terentyev ◽  
Pavel Ksenofontov ◽  
Aisen Zhirkov
Keyword(s):  
Mechanical Properties ◽  
Gas Pipeline ◽  
Term Operation ◽  
The North ◽  
Main Gas Pipeline

Structural and mechanical degradation of 09Mn2Si pipe steel after long-term operation

2017 ◽  
Author(s):  
S. V. Panin ◽  
P. O. Marushchak ◽  
I. V. Vlasov ◽  
A. V. Eremin ◽  
A. V. Byakov ◽  
...  
Keyword(s):  
Pipe Steel ◽  
Mechanical Degradation ◽  
Term Operation

scholarly journals Assessment of destruction conditions of the long-term operation gas pipeline

2017 ◽  
Vol 87 (3) ◽  
pp. 38-47
Author(s):  
R. Hrabovskyy ◽  
M. Mazur ◽  
A. Hrytsanchuk ◽  
V. Habinskyy
Keyword(s):  
Gas Pipeline ◽  
Term Operation

scholarly journals Brittle fracture manifestation in gas pipeline steels after long-term operation

2020 ◽  
Vol 28 ◽  
pp. 1204-1211
Author(s):  
Myroslava Hredil ◽  
Halyna Krechkovska ◽  
Oleksandra Student ◽  
Oleksandr Tsyrulnyk
Keyword(s):  
Brittle Fracture ◽  
Gas Pipeline ◽  
Pipeline Steels ◽  
Term Operation

scholarly journals THE MAIN GAS PIPELINES DEFECTS ANALYZING BY OPERATION PERIOD AND EXTENSION

2019 ◽  
pp. 93-99
Author(s):  
S. V. Kitaev ◽  
N. M. Darsalia ◽  
I. R. Baykov ◽  
O. V. Smorodova
Keyword(s):  
Gini Index ◽  
Gas Pipeline ◽  
Pipeline System ◽  
Gas Pipelines ◽  
Line Pipe ◽  
Term Operation ◽  
Wide Range ◽  
Operation Period ◽  
Standard Service

The gas pipeline system of PJSC «Gazprom» is at the stage of long-term operation. Most of the pipelines exceed the standard service life of 33 years, while considerable resources are required to maintain the trunk gas pipelines in an efficient state. The article analyzes the defectiveness of gas mains by the example of LLC «Gazprom transgaz Ufa». The company’s gas pipeline system consists of a wide range of diameters pipes ranging from DN 400 to DN 1400 mm. Its structure is dominated by pipelines with a diameter of DN 400, 500, 700, 1400 mm, which share exceeds 86 %. An integral Gini index is proposed for monitoring the differentiation of defects along the length of the line pipe of the main gas pipelines. By the value of the proposed indicator, it is possible to analyze and compare the sections of gas pipelines among themselves, to identify the signs that affect the development of defects along the line pipe of the main gas pipelines.

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