Совершенствование методов планирования ремонтных работ на основе анализа надежности нефтепроводной системы

2021 ◽  
pp. 562-568
Author(s):  
Mikhail A. Belostotsky ◽  
Anatoly M. Korolenok
Keyword(s):  
System Reliability ◽  
Structural Models ◽  
Physical Models ◽  
Simulation Process ◽  
Reliability Indicators ◽  
Main Pipelines ◽  
Oil Pipelines ◽  
Complex Technical System ◽  
Multi Level ◽  
Mathematical Operations

The author presents the methodology for identifying risks in operation of main oil pipelines, which can be based upon in improvement of methods for planning overhauls of the main pipelines. A method for calculating reliability indicators of the system is reviewed, including analysis of the type distributions of the system elements failures pattern. The reliability of the system is determined by purely mathematical operations on the obtained distributions. Such an approach is typical for the system (structural, mathematical) theory of reliability, the key task thereof being the transition from the elements reliability indicators to the system reliability indicators. It is advisable to resolve the problems of calculating the actual reliability of a complex technical system taking for consideration the dependencies of its elements, based on the approach assuming that reliability of the elements and the system shall be calculated in the general multi-level simulation process wherein both physical and structural models are used. Physical models of elements reliability are used at lower levels, while structural models are used at higher ones. Установлена своевременность и актуальность идентификации и формализации структурно-логических связей показателей эксплуатации линейной части магистральных нефтепроводов. Представлена методология идентификации рисков при эксплуатации магистральных нефтепроводов, которая может быть положена в основу совершенствования методов планирования их капитальных ремонтов. Рассмотрен метод для расчета показателей надежности технической системы, предусматривающий анализ типовых распределений отказов ее элементов. Надежность системы находится чисто математическими операциями над полученными распределениями. Подобный подход характерен для системной (структурной, математической) теории надежности, основной задачей которой является переход от показателей надежности элементов к показателям надежности системы. Задачи расчета реальной надежности сложной технической системы с учетом зависимостей ее элементов целесообразно решать на основе подхода, который состоит в том, что расчет надежности элементов и системы проводится в общем многоуровневом имитационном моделирующем процессе с применением физических и структурных моделей. Физические модели надежности элементов используются на низших уровнях, а структурные модели – на высших.

scholarly journals Assessment of Seismic Vulnerability of the Main Pipelines in Information Deficiency Conditions

10.12737/208 ◽  
2013 ◽  
Vol 2 (1) ◽  
pp. 20-30
Author(s):  
Котляревский ◽  
Vladimir Kotlyarevskiy ◽  
Ларионов ◽  
Valeriy Larionov ◽  
Александров ◽  
...  
Keyword(s):  
Dynamic Analysis ◽  
Seismic Vulnerability ◽  
Experimental Information ◽  
Climatic Conditions ◽  
Main Pipeline ◽  
Pipeline Transport ◽  
Safe Operation ◽  
Main Pipelines ◽  
Oil Pipelines

Operation in difficult climatic conditions and the large extent of the main gas and oil pipelines causes the need of search of new decisions for ensuring the reliable and safe operation of pipeline transport objects. The technique offered in this article is based on the plotting of seismic vulnerability function of the main pipeline embedded in soil by calculated dynamic analysis of stresseddeformed state in conditions of experimental information lack.

DESIGN OF A MULTI-LEVEL FAULT-TOLERANT MESH (MFTM) FOR HIGH RELIABILITY APPLICATIONS

1995 ◽  
Vol 02 (04) ◽  
pp. 419-429
Author(s):  
SHAMBHU J. UPADHYAYA ◽  
I-SHYAN HWANG
Keyword(s):  
System Reliability ◽  
Fault Tolerant ◽  
High Reliability ◽  
Operational Reliability ◽  
Variable Number ◽  
Hierarchical Design ◽  
Processor Arrays ◽  
Design Paradigm ◽  
Multi Level ◽  
Overall Reliability

This paper presents a novel technique for the enhancement of operational reliability of processor arrays by a multi-level fault-tolerant design approach. The key idea of the design is based on the well known hierarchical design paradigm. The proposed fault-tolerant architecture uses a flexible reconfiguration of redundant nodes, thereby offering a better spare utilization than existing two-level redundancy schemes. A variable number of spares is provided at each level of redundancy which enables a flexible reconfiguration as well as area efficient layouts and better spare utilization. The spare nodes at each level can replace any of the failed primary nodes, not only at the same level but also those at the lower levels. The architecture can be adopted to increase the system reliability in Multi Chip Modules (MCMs). The main contributions of our work are the higher degree of fault tolerance, higher overall reliability, flexibility, and a better spare utilization.

scholarly journals A New Analytic Method of Cold Standby System Reliability Model with Priority

2018 ◽  
Vol 175 ◽  
pp. 03060
Author(s):  
Di Peng ◽  
Ni Zichun ◽  
Hu Bin
Keyword(s):  
System Reliability ◽  
Reliability Function ◽  
Matrix Analysis ◽  
Reliability Model ◽  
Reliability Indicators ◽  
Reliability Modelling ◽  
Maintenance Time ◽  
Cold Standby ◽  
The Matrix ◽  
Standby System

For different importance of components in equipment system, a cold standby system with two different components is studied when important components enjoy the priority in use and maintenance. Considering the application of exponential distribution, Weibull distribution and other typical distributions in resolving the problems subject to complicated calculation and strict constraints in the past reliability modelling, the highly applicable phase-type (PH) distribution is utilized to describe the life and maintenance time of system components in a unified manner. A system reliability model is built for wider applicability. With the matrix analysis method, expressions are obtained for a number of reliability indicators such as system reliability function, steady-state availability, mean up time and mean down time of system. In the end, examples are presented to verify the correctness and applicability of the model.

Optimization problems for ensuring ecological safety of main oil pipelines

2020 ◽  
Vol 10 (3) ◽  
pp. 293-299
Author(s):  
Аdam М. Gonopolsky ◽  
◽  
Тatyana V. Zinets ◽  
Keyword(s):  
Optimization Problems ◽  
Economic Security ◽  
Main Pipelines ◽  
Oil Pipelines ◽  
Environmental Technologies ◽  
Goal Functions ◽  
The Cost ◽  
Stochastic Reliability ◽  
State Of The Environment ◽  
The Impact

This article is devoted to the search for optimal conditions for environmental and economic security of oil main pipelines using classical calculus of variations. The goal functions here are either stochastic reliability criteria for deterministic parametric criteria, or parametric criteria for specified reliability criteria. The functions of the optimization process are environmental and technological indicators of the system, taking into account the characteristics of oil pipelines or a set of measures to improve their reliability. The arguments are environmental and economic indicators that reflect the impact of control actions on the state of the environment and on the level of costs for the implementation of proposals. The formulation and study of the variational problem showed that only the introduction of environmental technologies and structures can minimize the cost of ensuring the safety of the impact of oil main pipelines on the host ecosystem.

The Analysis of Ecologically Safe Operation of Oil Pipelines by Methods of the Stochastic Theory of Similarity

2020 ◽  
Vol 24 (10) ◽  
pp. 57-61
Author(s):  
T.V. Zinets ◽  
A.M. Gonopolsky
Keyword(s):  
Stochastic Theory ◽  
Environmental Safety ◽  
Structural Elements ◽  
Safe Operation ◽  
Nature Protection ◽  
Factors Affecting ◽  
Oil Pipeline ◽  
Emergency Situations ◽  
Main Pipelines ◽  
Oil Pipelines

In article it is shown that in the analysis of conditions of environmental safety of the main oil pipelines (MOP) with use of methods of the stochastic theory of similarity, it is necessary to consider not only the MNP design-technology parameters, but also various chemical mass-exchanged processes, for example, corrosion (oxygen, sulphurous and chloric corrosion), influencing changes of structural elements in time and space. For these reasons, dependences between parametrical criteria of similarity and their communications with stochastic criteria of similarity are the basis for the developed model. Comparative analysis was carried out by results of a research more than 70 emergency situations, at transportation of oil through the main pipelines of 18 companies. In parameters of accidents criteria ratios between the factors affecting environmental safety of MNP are received. It is established that average specific intensity of accidents on routes of the sites of the oil pipeline equipped adjustable and unregulated nature protection to constructions and the equipment and also without them, correspond as 1:4.9:83.5. It is shown that a ratio of costs of compensation of ecological damage in case of accidents on routes of the same sites of the oil pipeline equipped adjustable and unregulated nature protection to constructions and the equipment and also without them approximately correspond as 1:1.9:7.5.

Estimated Guaranteed Life for a System Model with Redundancy of Heterogeneous Elements

2019 ◽  
pp. 4-17
Author(s):  
I.V. Pavlov ◽  
S.V. Razgulyaev
Keyword(s):  
System Reliability ◽  
High Reliability ◽  
Analytical Calculation ◽  
Reliability Function ◽  
System Model ◽  
Confidence Estimation ◽  
Reliability Indicators ◽  
Lower Confidence ◽  
Asymptotic Expressions ◽  
System Life

The paper focuses on the problem of confidence estimation of reliability indicators for a system model with loaded redundancy of elements of various sub-systems. The lower confidence limits are constructed for the system reliability function, as well as for the indicator associated with it, the indicator having a given guaranteed level of the system uptime, i.e., its gamma-percentile life. Within the research, we obtained approximate asymptotic --- for the case of high reliability --- expressions for confidence estimates of these basic indicators of system reliability. Rather simple approximate analytical calculation formulas based on these asymptotic expressions are given for the lower confidence boundary of the system reliability function and a similar confidence boundary for the guaranteed system life.

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