scholarly journals TECHNOLOGICAL ASPECTS OF ASSESSMENT OF RELIABILITY, QUALITY AND ENVIRONMENTAL SAFETY OF SUPPLEMENTARY MATERIAL FOR MANUFACTURE OF TRANSPORT PIPELINES

2020 ◽  
Vol 3 (156) ◽  
pp. 56-61 ◽  
Author(s):  
Y. Varlamov ◽  
V. Kotukh ◽  
K. Palyeyeva
Keyword(s):  
Technological Process ◽  
Design Method ◽  
Dimensional Space ◽  
General Scheme ◽  
Environmental Safety ◽  
Imple Mentation ◽  
Pipeline Systems ◽  
Piping Systems ◽  
Supplementary Material ◽  
Auxiliary Material

When carrying out finishing (finishing and lapping) operations necessary for the manufacture (repair) of products of transport pipeline systems, special attention is paid to the auxiliary materials necessary for the imple-mentation of this technological process. The basis of these materials are chemically active, surfactant, flammable and explosive substances of organic and inorganic origin, developed according to a certain recipe in a strict combination of ingredients and with high requirements for quality output. During the implementation of the technological process of manufacturing or repair of products of transport pipeline systems, the auxiliary material is often considered as a kind of random process that has a certain impact on the environmental safety of these systems. This material for technological purposes is characterized by a num-ber of indicators that do not have numerical values, but to interpret them it is necessary to build a system of logi-cal and analytically related relationships, taking into account the required formulation of auxiliary material. In practice, these indicators of the material represent some criterion (criteria), which in the n-dimensional space can be represented as a vector of the technological state of the auxiliary material on the basis of its integrated evalua-tion. At present, a general scheme of work on the automated design of the formulation of auxiliary material based on the aggregate design method has been developed. The task of this method is to give the developed auxiliary material the maximum potential energy, as well as to increase its shelf life and reduce the risk of environmental impact. In addition, there are certain requirements for the ingredients of the material, and the formulation of the auxiliary material is based on the use of such ingredients that would ensure the reliability, quality and environ-mental safety of the operation of transport pipelines. Keywords: pipe fittings, transport piping systems, auxiliary material, recipe, quality, reliability, environmen-tal safety.

scholarly journals THEORETICAL RESEARCH OF THE RECIPE OF SUPPLEMENTARY MATERIAL OF TECHNOLOGICAL PURPOSE FOR ENSURING ECOLOGICAL BEZ-PEPYKHYRA VYROPYRA

2020 ◽  
Vol 4 (157) ◽  
pp. 134-139
Author(s):  
Y. Varlamov ◽  
V. Kotukh ◽  
K. Palyeyeva
Keyword(s):  
Maximum Level ◽  
Environmental Safety ◽  
Theoretical Research ◽  
Material Transport ◽  
Principle Of Superposition ◽  
Pipeline Systems ◽  
Other Substances ◽  
Auxiliary Material

In the manufacture (repair) of products of transport pipeline systems, auxiliary materials are widely used, which play the role of lubricants, cooling, cleaning and other substances. Special requirements are imposed on the composition of such substances, which are developed in accordance with the technological instructions, since they are, as a rule, chemically active, surfactants of organic and inorganic origin. Therefore, not only the quality of processing of structural elements of transport pipeline systems, but also the environmental safety of the techno-logical process of their manufacture (repair) depends on the composition and mass fraction of ingredients in these substances. Of particular importance in solving problems on this problem belongs to the theory of predicting the formation of the composition of effective auxiliary materials, assessed by technological, economic, sanitary and hygienic and other indicators that are directly related to the formulation of these materials. The theoretical foundations and methods for creating auxiliary materials for technological purposes in the practice of specialized enterprises are implemented using the example of a simplified technological scheme. Ac-cording to this scheme, the action of each source of deviations (errors in the composition of the auxiliary material) is evaluated separately, and the other sources are “off,” that is, the principle of superposition is implemented. For a qualitative reflection of the technological uniformity of any two constituent ingredients in terms of their influ-ence coefficients, the concept of "intersection" is used, and all possible intersections between pairs of constituents form a square matrix of intersections of dimensions. The level of effective homogeneity, which predetermines the quality of the auxiliary material for technological purposes, depends on two groups of indicators that equally affect this effective homogeneity. Thus, any variant of the formulation of an auxiliary material consisting of groups of constituents with the maximum level of objective closure always corresponds to a certain variant of an ordered series of ingredients. Keywords: auxiliary material, transport pipeline systems, error, quality, reliability, environmental safety, manufacturing, repair.

Improvement of Integrity Concepts for NPP Primary Circuit Piping

2008 ◽  
Author(s):  
Alexey Arzhaev ◽  
Sergey Butorin
Keyword(s):  
Carbon Steel ◽  
General Scheme ◽  
Primary Circuit ◽  
Feed Water ◽  
Outer Diameter ◽  
Intergranular Stress Corrosion ◽  
Methodology Development ◽  
Integrity Assessment ◽  
Piping Systems ◽  
Steel Piping

Operating NPPs license extension activities in Russia produced strong demand for safety improvement of plants build according to earlier standards. Installation of additional supports as pipe whip restraints is one of requirement in acting regulatory documentation which should be followed or compensated by appropriate measures like Leak Before Break (LBB) analyses and improvement of In-Service Inspection (ISI) and Leak Detecting System (LDS). Basic document for LBB concept application to Russian NPP piping is RD 95 10547-99. Its requirements correspond to classical LBB principles used in many countries in Europe, USA and Japan. In many real cases requirements of RD 95 10547-99 could not be applied to safety important NPP piping systems due to the presence of specific features of operational degradation due to some corrosion mechanisms: for example, erosion-corrosion (E-C) for carbon steel piping and intergranular stress corrosion cracking (IGSSC) for heat affected zones of austenitic piping weldments. For special case of RBMK piping with outer diameter 325 mm (potentially susceptible to IGSCC) special Break Preclusion Concept has been developed in Russia after IAEA Extrabudgetary Program in 2000–2002. Contrary to LBB Concept demanding for all four basic principles to be completely fulfilled BP Concept accepts some principles to be fulfilled in a balanced way with demonstration of monitored degradation effectively achieved in operation. Special BP Concept is being developed now to support integrity assessment of RBMK carbon steel steam and feed water piping potentially susceptible to E-C which requires another set of measures to demonstrate principle of controlled degradation in operation then in case of austenitic steel piping. General scheme of piping integrity analyses according to LBB and BP Concepts is discussed and examples of specific approaches to achieve controlled degradation are illustrated in paper. As result of LBB and BP Concepts application it is possible to substantiate reject of additional piping whip restraints implementation on-site. Examples of similar safety methodology development in other countries have been reported at IAEA Specialists Meeting on LBB in Kiev, Ukraine in November 2006.

Dampers of Pressure Fluctuations in the Pipeline Systems of Power Plants and Production Machines

2020 ◽  
Vol 24 (1) ◽  
pp. 14-18
Author(s):  
N.S. Chernov
Keyword(s):  
Service Life ◽  
Power Plants ◽  
Fire Hazard ◽  
Pressure Fluctuations ◽  
Vibration Damping ◽  
Industrial Equipment ◽  
Noise And Vibration ◽  
Pipeline Systems ◽  
Piping Systems ◽  
Theoretical Foundations

Problems and ways to reduce pressure fluctuations in the piping systems of power plants and production machines are considered. The theoretical foundations of vibration damping are described. The developed device designs are given to reduce pressure fluctuations in pipeline systems. Studied and experimentally tested their effectiveness in comparison with foreign counterparts. The use of designed and implemented dampers to reduce noise and vibration, increase the efficiency, reliability and service life of industrial equipment, prevent fire hazard.

Performance-Based Analysis of Coupled Support Structures and Piping Systems Subject to Seismic Loading

2015 ◽  
Author(s):  
Oreste S. Bursi ◽  
Fabrizio Paolacci ◽  
Md Shahin Reza
Keyword(s):  
Seismic Design ◽  
Seismic Analysis ◽  
Design Method ◽  
Design Guidelines ◽  
Piping System ◽  
Support Structures ◽  
Limit States ◽  
Piping Systems ◽  
Allowable Stress Design

The prevailing lack of proper and uniform seismic design guidelines for piping systems impels designers to follow standards conceived for other structures, such as buildings. The modern performance-based design approach is yet to be widely adopted for piping systems, while the allowable stress design method is still the customary practice. This paper presents a performance-based seismic analysis of petrochemical piping systems coupled with support structures through a case study. We start with a concept of performance-based analysis, followed by establishing a link between limit states and earthquake levels, exemplifying Eurocode and Italian prescriptions. A brief critical review on seismic design criteria of piping, including interactions between piping and support, is offered thereafter. Finally, to illustrate actual applications of the performance-based analysis, non-linear analyses on a realistic petrochemical piping system is performed to assess its seismic performance.

A Study of Machine Design Method Based on Technological Process

2011 ◽  
Vol 697-698 ◽  
pp. 671-675
Author(s):  
D. Wang ◽  
Yu Hu Yang ◽  
Z. Shi
Keyword(s):  
Real Time ◽  
Technological Process ◽  
Design Process ◽  
Design Method ◽  
Tree Structure ◽  
Machine Design ◽  
Practical Design

This paper proposes a method of building the design tree with stratified constraints and modifications for the machine design with pre-defined technological process. The design method displays the design process in a tree structure with overall open yet local convergent characteristics. It is applied to develop an innovative, a comprehensive, and practical design through design detailing, integrative constraints and interventions, and real-time evaluations. As an example the design of the tire-building drum is given.

scholarly journals Improvement of the technological process of sowing sunflower seeds with a pneumatic seed planter

2021 ◽  
Vol 845 (1) ◽  
pp. 012136
Author(s):  
N P Kryuchin ◽  
A P Gorbachev
Keyword(s):  
Uniform Distribution ◽  
Technological Process ◽  
Coefficient Of Variation ◽  
3D Model ◽  
General Scheme ◽  
Sunflower Seeds ◽  
Seed Material

Abstract The article provides the objectives for the need to study the influence of the shaper on the seed velocity, as well as the influence of the arrangement of its rods on the grain speed at the outlet of the seed flow shaper. The general scheme of the seed flow shaper, its description, 3D model and its arrangement on the seeder are given in the article. It also describes the method of measuring the velocity of seed material. As a result of the study, the dependence of the velocity of sunflower seeds on the distance of the placement of rods, as well as the velocity of grains without a flow shaper, is presented. It was found that as the distance between the axes of the rods increases from 5 to 30 mm, the seed velocity at the outlet from the diffuser increases insignificantly, being in the range of 3.2 – 2.7 m/s. The results of using the seed flow shaper of the proposed design on the seed line of the Amazone DMC Primera pneumatic seed planter for sunflower sowing are also presented. As a result of the assessment of the uniform distribution of plants in rows by seedlings, it was concluded that the quality of seeding improved, the coefficient of variation of intervals between plants was 61.2 and 78.4% with and without the use of a shaper, respectively.

scholarly journals Environmental safety management system – as one of the components of energy efficiency

2020 ◽  
Vol 36 (4) ◽  
pp. 5-19
Author(s):  
Oksana M. Hunchenko ◽  
Olena S. Voloshkina ◽  
Мarina V. Kravchenko ◽  
Volodymyr I. Korinnyi
Keyword(s):  
Energy Efficiency ◽  
Management System ◽  
Safety Management ◽  
General Scheme ◽  
Environmental Safety ◽  
Environmental Management System ◽  
Safety System ◽  
Iso 14001 ◽  
Best Available Technologies ◽  
Characteristic Features

The article substantiates the relationship between environmental safety and energy efficiency – as the main components on the way to sustainable development of society. The existing approaches to defining the essence of environmental safety are considered, its characteristic features are detailed, the basic practical principles of its provision are substantiated, and promising directions for the further development of the international environmental safety system are shown. The general scheme of the organization of the ecological safety system in the normal state of the environment is presented, which should be based on three components: control, regulation and implementation of safety measures. It is shown that maximum efforts should be directed to making management decisions based on the analysis of existing risks and forecasting new potential threats, which are an integral part of human activity. An important stage in a productive management system is the use of the best available technologies, which does not require strict regulation of activities and provides the freedom to choose ways to achieve this goal, based on the latest technological and technological solutions. organizational developments and their successful combination. Competitive advantages and a number of disadvantages from the introduction of an environmental management system at an enterprise, in particular in the energy sector, have been substantiated. The article presents the main laws of Ukraine in the field of environmental safety, as well as the state standards of Ukraine in the series of international standard ISO 14000. The main stages of management in the field of environmental safety, based on the Shuhard-Deming cycle, are summarized and presented in the model of the environmental safety management standard DSTU ISO 14001:2015.

Numerical Scheme for Generalized Isoparametric Constraint Variational Problems With A-Operator

2013 ◽  
Author(s):  
Rajesh K. Pandey ◽  
Om P. Agrawal
Keyword(s):  
Numerical Scheme ◽  
Fractional Derivatives ◽  
Dimensional Space ◽  
General Scheme ◽  
Functional Space ◽  
Approximate Solutions ◽  
Variational Problems ◽  
Approximation Schemes ◽  
Finite Dimensional Space ◽  
Special Cases

This paper presents a numerical scheme for a class of Isoperimetric Constraint Variational Problems (ICVPs) defined in terms of an A-operator introduced recently. In this scheme, Bernstein’s polynomials are used to approximate the desired function and to reduce the problem from a functional space to an eigenvalue problem in a finite dimensional space. Properties of the eigenvalues and eigenvectors of this problem are used to obtain approximate solutions to the problem. Results for two examples are presented to demonstrate the effectiveness of the proposed scheme. In special cases the A-operator reduce to Riemann-Liouville, Caputo, Riesz-Riemann-Liouville and Riesz-Caputo, and several other fractional derivatives defined in the literature. Thus, the approach presented here provides a general scheme for ICVPs defined using different types of fractional derivatives. Although, only Bernstein’s polynomials are used here to approximate the solutions, many other approximation schemes are possible. Effectiveness of these approximation schemes will be presented in the future.

Seismic Assessment of Petrochemical Piping Systems Using a Performance-Based Approach

2016 ◽  
Vol 138 (3) ◽  
Author(s):  
Oreste S. Bursi ◽  
Fabrizio Paolacci ◽  
Md Shahin Reza ◽  
Silvia Alessandri ◽  
Nicola Tondini
Keyword(s):  
Seismic Design ◽  
Seismic Analysis ◽  
Design Method ◽  
Limit States ◽  
Design Rules ◽  
Analysis And Design ◽  
Actual Application ◽  
Piping Systems ◽  
Critical Issues ◽  
Allowable Stress Design

The need of enhanced seismic analysis and design rules for petrochemical piping systems is widely recognized, where the allowable stress design method is still the customary practice. This paper presents an up-to-date performance-based seismic analysis (PBSA) of piping systems. The concept of performance-based analysis is introduced and a link between limit states and earthquake levels is proposed, exemplifying international code prescriptions. A brief review on seismic design criteria of piping systems is then provided by identifying the main critical issues. Finally, the actual application of the performance-based approach is illustrated through nonlinear seismic analyses of two realistic petrochemical piping systems.

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