scholarly journals The corrosion damage mechanisms of the gas pipelines in the Republic of Sakha (Yakutia)

2019 ◽  
Vol 121 ◽  
pp. 03002
Author(s):  
Alexander Ivanov ◽  
Konstantin Bolshev ◽  
Alexander Bolshakov ◽  
Aytalina Syromyatnikova ◽  
Anisiy Alexeev ◽  
...  
Keyword(s):  
Corrosion Damage ◽  
Main Pipeline ◽  
Working Capacity ◽  
Term Operation ◽  
Long Period ◽  
Gas Main ◽  
Gas Main Pipeline ◽  
The Republic ◽  
Near Future

The article provides examples of critical damage to a long-running gas pipeline on the territory of the Republic of Sakha (Yakutia), which arose as a result of the development of corrosion processes, discusses the mechanisms and scenarios for the development of corrosion damage in the cryolithozone conditions. Considering the processes and mechanisms, they continue for a long period of time., an increase in the number of damages to a gas main pipeline due to corrosive degradation is expected in the near future. The stage of diffuse damage during long-term operation is confirmed by the increasing loss of working capacity due to corrosion damage in the last 25 years of the pipeline operation.

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

Optimal Running Conditions of Cooling Systems of the Gas-Main Pipeline Compressor Stations

2009 ◽  
Vol 40 (4) ◽  
pp. 293-304 ◽  
Author(s):  
I. Cherednichenko ◽  
E. Khodak ◽  
A. I. Kirillov ◽  
N. Zabelin
Keyword(s):  
Main Pipeline ◽  
Cooling Systems ◽  
Gas Main ◽  
Gas Main Pipeline

scholarly journals Mechanical Properties of Gas Main Steels after Long-Term Operation and Peculiarities of Their Fracture Surface Morphology

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 491 ◽  
Author(s):  
Volodymyr Hutsaylyuk ◽  
Pavlo Maruschak ◽  
Ihor Konovalenko ◽  
Sergey Panin ◽  
Roman Bishchak ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Surface ◽  
Damage Accumulation ◽  
Classification Scheme ◽  
Steel Structure ◽  
Term Operation ◽  
Gas Main ◽  
Structure Degradation ◽  
Main Pipelines

Regularities of steel structure degradation of the “Novopskov-Aksay-Mozdok” gas main pipelines (Nevinnomysskaya CS) as well as the “Gorky-Center” pipelines (Gavrilovskaya CS) were studied. The revealed peculiarities of their degradation after long-term operation are suggested to be treated as a particular case of the damage accumulation classification (scheme) proposed by prof. H.M. Nykyforchyn. It is shown that the fracture surface consists of sections of ductile separation and localized zones of micro-spalling. The presence of the latter testifies to the hydrogen-induced embrittlement effect. However, the steels under investigation possess sufficiently high levels of the mechanical properties required for their further safe exploitation, both in terms of durability and cracking resistance.

scholarly journals Applicability of Z-score Models on the Agricultural Companies in the Republic of Srpska (Bosnia and Herzegovina)

2018 ◽  
Vol 18 (4) ◽  
pp. 227
Author(s):  
Tamara Stojanović ◽  
Ljiljana Drinić
Keyword(s):  
Safe Zone ◽  
Z Score ◽  
Financial Variables ◽  
Financial Difficulties ◽  
Ex Post ◽  
Ex Ante ◽  
The Republic ◽  
Near Future ◽  
Ex Post Analysis

The aim of our research was to test the predictability of Altman’s Z-score models in the case of agricultural companies in the Republic of Srpska. Due to the fact that according to these models the companies from the critical zone are supposed to go bankrupt in the near future, while the companies from the safe zone are not supposed to go bankrupt, these two groups of companies have been subject to ex-ante analysis during the period of five years (2011-2015) in order to estimate the predicting efficiency of Z-score models. The authors have also performed the ex-post analysis to see how the bankrupt companies had been classified according to these models in the years preceding their bankruptcy. The results of these analyses show that Z-score models are not reliable in predicting bankruptcy, nor for the creditworthiness analysis, but can be useful in identifying agricultural companies with long-term financial difficulties especially if other, non-financial variables are included.

Risk-oriented approach to the issue of industrial safety and energy resource efficiency gas transport enterprises

2020 ◽  
pp. 244-253
Author(s):  
A.S. Belikov ◽  
◽  
Z.N. Matsuk ◽  
Keyword(s):  
Energy Efficiency ◽  
Natural Gas ◽  
Gas Transport ◽  
Energy Resource ◽  
Resource Efficiency ◽  
Main Pipeline ◽  
Gas Main ◽  
Routine Work ◽  
Gas Main Pipeline ◽  
Oriented Approach

Any gas-main pipeline presents a technological complex of objects that functions as a single system, where all objects of the gas-main pipeline are classified as hazardous facilities, for which most of the existing risks are typical. In order to maintain a gas-transport system in operational, standard and safe condition, it is necessary to perform repair (routine) work assuming replacement or repair of defective sections of the pipe (or other equipment). The methods which an operator of a gas-transport system uses today for ensuring safety of such repair (routine) work are either environmentally harmful (“bleed” of gas), or hazardous and inefficient by energy and/or resource (“bleed” of gas, gas utilization, increasing of pipeline bearing capacity, "overlaying-welding" of defects under pressure, etc.). With this scheme of technological process, level of working and environmental safety and energy-resource efficiency of gas-transport enterprises sharply decreases. The purpose of our research was to propose a risk-oriented approach to the problem of working safety and energy resource efficiency of the gas-transport enterprises. The only type of repair, with which operational (safe) state and resource of the pipeline system can be fully restored is replacement of defective pipe or its section. Therefore, at the stage of preparatory work, the most acute problem is discharge of natural gas from the local section of pipelines by means of its pumping-over (accumulation) instead of "bleeding" or "utilization". We propose a rational, effective and risk-oriented approach to the use of mobile compressor units for pumping over (evacuating) of natural gas as a method for improving working safety and energy efficiency of the gas-transport enterprises. The proposed approach allows the gas-transport companies to create quickly an automated risk management system and reduce the risk level and, as a result, to improve working safety and energy efficiency of the processes of gas transportation.

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.

Life-Cycle Assessment of Flexible Risers

2014 ◽  
Author(s):  
Dag Fergestad ◽  
Svein Are Løtveit ◽  
Bernt J. Leira
Keyword(s):  
Life Cycle ◽  
Fatigue Testing ◽  
Numerical Models ◽  
Corrosion Damage ◽  
Term Operation ◽  
Integrity Assessment ◽  
Life Cycle Design ◽  
Flexible Pipes ◽  
Residual Capacity

The number of flexible pipes in operation is increasing due to new field developments and the desire to extend the lifetime of existing fields. There have been many challenges with respect to long term operation of such pipes, in many cases with the need to replace or repair before the end of the initial design life. The number of identified failure mechanisms and observed failure events is also increasing. The present paper summarizes state of the art technology related to operation of flexible pipes and some recent research and development activities that contribute to resolving these issues. In particular, the following topics are addressed: • Fatigue testing of flexible pipes subjected to corrosion damage during operation • Development of improved numerical models and methods for assessment of the residual capacity of flexible pipes • Integrity assessment of flexible pipes also applying quantified risk and reliability assessment • Repair methods for damaged pipe sections In addition, an outline is given of a Handbook (ref. Handbook 2014) which addresses the various topics related to life-cycle design and operation of flexible pipes, see Appendix. Future prioritized research efforts with focus on some of the topical issues given in the list above are finally addressed.

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
Sign in / Sign up

Export Citation Format

Share Document