Effect of Long Term Operation on Degradation of Material of Main Gas Pipelines

2014 ◽  
Vol 782 ◽  
pp. 279-283 ◽  
Author(s):  
Pavlo Maruschak ◽  
Roman Bishchak ◽  
Igor Konovalenko ◽  
Abdellah Menou ◽  
Janette Brezinová
Keyword(s):  
Digital Images ◽  
Main Pipeline ◽  
Gas Pipelines ◽  
Indentation Method ◽  
Term Operation ◽  
Metal Damage

The mechanisms of metal damage in the pipe of the main pipeline are investigated, the main reasons for their appearance are found and analysed. The main results are obtained by joint use of metallography, indentation, method for processing and analysis of digital images.

Physical metallurgy conditions for retaining the load-carrying ability of the gas-main pipeline metal during long-term operation

2009 ◽  
Vol 2009 (4) ◽  
pp. 314-321 ◽  
Author(s):  
M. M. Kantor ◽  
V. N. Voronin ◽  
V. A. Bozhenov ◽  
V. G. Antonov ◽  
Yu. M. Sharygin
Keyword(s):  
Physical Metallurgy ◽  
Main Pipeline ◽  
Term Operation ◽  
Gas Main ◽  
Gas Main Pipeline ◽  
Load Carrying

Influence of the Long-Term Operation of Gas Pipelines on the Cyclic Crack-Growth Resistance of 17G1S Steel

2017 ◽  
Vol 52 (6) ◽  
pp. 827-833
Author(s):  
E. V. Kharchenko ◽  
S. Klysz ◽  
V. M. Palyukh ◽  
O. E. Kunta ◽  
T. M. Lenkovs’kyi
Keyword(s):  
Crack Growth ◽  
Crack Growth Resistance ◽  
Gas Pipelines ◽  
Term Operation ◽  
17G1s Steel

scholarly journals Impact of Long-Term Operation on the Reliability and Durability of Transit Gas Pipelines

2020 ◽  
Vol 70 (1) ◽  
pp. 115-126
Author(s):  
Okipnyi Igor ◽  
Poberezhny Lyubomyr ◽  
Zapukhliak Vasyl ◽  
Hrytsanchuk Andrii ◽  
Poberezhna Liubov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Fatigue ◽  
Static Loading ◽  
Physical And Mechanical Properties ◽  
Fatigue Tests ◽  
Gas Pipelines ◽  
Term Operation ◽  
Full Capacity ◽  
Corrosive Environments

AbstractCorrosion and corrosion-fatigue tests of the material of the pipeline, which was in operation for 41 years. It has been shown that prolonged operation reduces the parameters of resistance to fatigue and prolonged static loading in corrosive environments. It was established that the degradation of physical and mechanical properties is insignificant, Ukraine’s main gas pipelines are ready to operate at full capacity provided that timely monitoring measures are carried out.

Physical and Mechanical Aspects of Corrosion Damage of Distribution Gas Pipelines After Long-Term Operation

2018 ◽  
Vol 18 (3) ◽  
pp. 562-567 ◽  
Author(s):  
Pavlo Maruschak ◽  
Lyubomyr Poberezny ◽  
Olegas Prentkovskis ◽  
Roman Bishchak ◽  
Andriy Sorochak ◽  
...  
Keyword(s):  
Corrosion Damage ◽  
Gas Pipelines ◽  
Term Operation

scholarly journals Stereological Evaluation of Precipitates within Ferrite Grains in Heat-Treated 1.25Cr0.5Mo Steel Previously Exposed to Service

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Rafael Fernández-Fuentes ◽  
Americo Scotti ◽  
Amado Cruz-Crespo ◽  
Roberto Silva González ◽  
Rafael Ariza Gonçalves ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Volume Fraction ◽  
Digital Images ◽  
Post Weld Heat Treatment ◽  
Aged Material ◽  
Term Operation ◽  
Heat Treated ◽  
Service Operation ◽  
Weld Heat

The objective of this work was to study the effect of the heat treatment and further operation aging on the stereological parameters (size, quantity and volume fraction) of precipitates within ferrite grains of a creep-resistant 1.25Cr0.5Mo steel after long-term operation. The heat treatment was similar to the treatment that is carried out in industrial steam pipelines after welding (post weld heat treatment - PWHT) during installation and/or repairing. The operation aging corresponds to a subsequent long in-service operation after repairing. To determine the stereological parameters, SEM digital images were taken from samples of this material after conditions of in-service-aged (after long-term operation), in-service-aged and heat-treated (simulating repairing) and in-service-aged, heat-treated and in-laboratory aged (simulating subsequent long-term operation after repairing). The results indicate that the changes in the stereological parameters of the precipitates within ferrite grains after PWHT is associated with the coarsening process of the within-ferrite-grain precipitates as well as stabilizing the microstructure, since the material aging after PWHT of an in-serviced aged material would not change the stereological parameters.

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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