Anvar Valeev

Anvar Valeev
Ufa State Petroleum Technological University · Department of Oil and gas transportation and storage

Ph. D.

About

53
Publications
5,098
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144
Citations

Publications

Publications (53)
Article
Full-text available
2021. № 4. С. 45-50. Abstract: This article is devoted to the problem of cleaning oil transport and storage facilities from asphalt-resin-paraffin deposits. An overview of modern achievements in this field is presented. The study is based on a system of mathematical equations that models the process of temperature changes and melting of deposits, t...
Article
This paper presents results of a comparative analysis of several research methods for oil pipelines waxing process, which are based on the progress made with present-day laboratory equipment and the capabilities of software and hardware computational packages used to simulate properties of multiphase fluids and kinetics of complex multi-factor proc...
Chapter
Oscillations of pump pipings can be caused by both hydrodynamic reasons and vortex formation at local resistances and resonance with the natural frequencies of the piping. In some cases, the vibration of pipelines exceeds the permissible norms by 1.5–2 times. The range of vibration frequencies of a hydrodynamic nature directly depends on the flow r...
Article
Full-text available
The paper proposes a new approach to assessing the residual resource of the wall of a vertical steel tank by the criterion of low-cycle loading, taking into account its actual deformations. The method is based on the principle of measuring the difference in the power of the luminous flux at the ends of the light tube (light guide) when it is bent....
Article
This study aimed to develop a compact high - efficiency vibration isolator. It was proposed to use force characteristic with quasi - zero stiffness. To avoid a number of design problems, the isolator was designed in a dome shape. This study features a mathematical model of the vibration isolator with quasi- zero stiffness. It allows calculating the...
Article
Full-text available
2020. № 5-6. С. 5-9. Abstract: The article is devoted to the use of ultrasound in oil transportation and storage facilities for removing asphalt-tar and paraffin deposits. A classification of methods for removing asphalt-tar and paraffin deposits in wells, pipelines, and tanks is formulated. The review of scientific works on the use of ultrasound a...
Chapter
The efficiency of pumping units’ operation is one of the most important issues of the main transport of oil and oil products. In most cases the failure of the machine is preceded by a sharp increase of the vibration level. With a long service life of the pumping equipment, the frequency components of the vibration increase linearly and slowly enoug...
Chapter
The paper is devoted to the development of exoskeletons based on elastic hinges with a given force characteristic for gravitational compensation of various heavy objects. This study is devoted to passive gravitational compensation, i.e., without energy supply. For static conditions, the characteristics of two elastic hinges, which are located betwe...
Article
The present study conducts an experiment on water lubricated oil-water flow inside a horizontal pipe designed with a 90° elbow, in which the selected test fluids are mineral oil and tap water with a viscosity ratio of approximately 1000 and density ratio of 0.9. Measurements are recorded for the flow rates of oil and water from 10.60 to 28.26 L/min...
Article
Full-text available
Above-ground laying of field and main oil and gas pipelines is one of the most common methods in the conditions of the North and permafrost soils, as well as at the intersection of ravines, canals, small rivers, in rocky soils, in areas of mine workings and landslides. Under the influence of wind, above-ground pipelines can experience oscillations...
Chapter
The study is devoted to improve the reliability of diagnosing the technical condition of rotary equipment. Nowadays different methods of diagnostics of equipment are used, but the currently applied methods do not allow enough reliable determining defects, because the methods of non-destructive testing use indirect and expert methods of their identi...
Chapter
The paper is devoted to the problem of reduction of the vibration level of pipelines, caused by resonance with the disturbing frequency of pumping units. Each case of the occurrence of pipeline vibrations requires a careful and qualified analysis, because no universal methods for reducing the vibration of technological pipelines have been developed...
Chapter
Full-text available
This study presents systems with quasi-zero stiffness. The interest in these systems has been constantly increasing recently. In most of the systems with quasi-zero stiffness, the force characteristic with quasi-zero stiffness is obtained due to the combination of systems with negative and systems with positive stiffness. Generally, the length of t...
Article
Full-text available
The paper is devoted to the problem of reduction of vibration level of pipelines, caused by resonance with the disturbing frequency of pumping units. The causes of large vibrations of main pump units piping and its influence to the level of the pump unit oscillations are analyzed. The source of increased vibration exposure in the “pump - pipe” syst...
Article
Full-text available
The Paper is devoted to the problem of reduction of vibration level in civil and industrial structures and buildings. It is offered to use two-component material for vibration isolation. A special internal structure, that provides quasi-zero stiffness effect, is designed for this purpose. Use of two components makes the material more stable. Analyt...
Article
Full-text available
During exploitation of oil pipelines and storages oil spill can occur. For effective collecting spills sorbents are used. There are many types of sorbents, but sorbents that can be utilized in excess oil are very promising. The aim of the work is to study the properties of such substances, their applicability for oil spill collection and comparison...
Article
Full-text available
Variable frequency drives can be used in many industries. Especially they are very promising in oil and gas industry. Variable frequency drive allows pumping in smooth regime that reduces energy consumption in comparison with multi-regime pumping. Such a drive can also increase reliability of equipment. In this Paper analysis of application of vari...
Chapter
In the paper, the application of a pre-screwed wheel of centrifugal main oil pumps is observed. The pre-screwed wheel serves as a backup pump for the main impeller and creates a small head. In this case, the cavitations reserve of the main unit is significantly reduced. The increase of throughput capacity is due to two factors: a slight increase in...
Article
Full-text available
This article is devoted to finding solutions of problems of vibration isolators with quasi-zero stiffness from a manufacturing point of view. The following study is appeared after experimental study and manufacturing of preproduction serial of universal isolators of a dome type. An analytical description of some types of vibration isolators with qu...
Article
The Paper is devoted to vibrating isolating plate with quasi-zero stiffness. It based on dome type cells with quasi-zero stiffness, that provide low natural frequency about 1 Hz. The general scheme of the plate is presented. Dimension, efficiency and other parameters of the plate were discussed. The effect of plate's application has been estimated....
Article
Full-text available
The causes of large vibrations of main pump units piping and its influence to the level of the pump unit oscillations are analyzed. The source of increased vibration exposure in the “pump - pipe” system is often not only the pump unit, but pump piping also. Piping of the pumping unit in case of its operating parameters changing can be entered to re...
Article
Full-text available
Maintenance and repair of pumping units requires a lot of high material costs and time. Planned maintenance is usually used now. But in inter-maintenance period nobody knows real technical condition of units. Automated control system of vibration parameters in real time is presented. It show actual state of a pump at every time moment. Developed by...
Article
Full-text available
Influence of dynamic force of machines on its foundation is analyzed. Decrease of dynamic force can greatly decrease amount of concrete required for foundation construction. Application of different types of vibration isolators is analyzed. Special attention is paid for vibration isolators with quasi-zero stiffness that have high efficiency. But fo...
Article
The paper is devoted to the idea of metamaterials with quasi-zero stiffness for vibration isolation. Metametarials may provide special and unique properties of materials. In this area it is possible to use the principles of systems with quasi-zero stiffness. Such nonlinear deformation of material provides low stiffness at a certain point. Hence low...
Article
The paper deals with the problem of constructing systems with discontinuous quasizero reconstructing force on the basis of structures where an elastic element moves between two directrices of prescribed design shape perpendicularly to their axis of symmetry. A spring is considered as an elastic element. The cases where the elastic element works onl...
Article
Full-text available
The Paper is devoted to vibration isolating matematerial. The internal structure is made of a special shape that provide quasi-zero stiffness. Computer modeling was made and parameters providing quasi-zero stiffness have been obtained. Structure with quasi-zero stiffness was analyzed and optimal load was considered. The matematerial has very promis...
Conference Paper
The article is devoted to the idea of metamaterials with quasi-zero stiffness for vibration isolation. Metametarials can provide a special and unique material properties. Principles of systems with quasi-zero stiffness can be applied in this researches. Metamaterial with a low rigidity in a certain point. Consequently, low natural frequency vibrati...
Article
Full-text available
The paper dwells upon vibration isolators with a low or quasi-zero stiffness. They can provide a low natural frequency less than 1Hz. Different materials for manufacturing were analyzed. Various vibration isolators with quasi-zero stiffness with operating load from 1kg to 1000kg have been calculated. The scheme of installation of invented vibration...
Conference Paper
Full-text available
Vibration isolation with high efficiency is very important for industry. Vibration isolation of low frequency is also a well-known problem. Systems with quasi-zero stiffness are very perspective in this field. There are many problem connected with these systems, for example: complexity, nonlinearity, instability. But the authors have invented vibra...
Conference Paper
Full-text available
There is a problem to provide isolation of low frequency vibration. Another problem is to provide very high vibration isolation efficiency. It's possible to do this with a help of systems having the nonlinear force characteristics, also called as systems with quasi-zero stiffness. Studying and manufacturing of such systems provide many problems, be...
Article
Full-text available
Application of disk springs as vibration isolators with quasi-zero stiffness is described. Analytical studies are made to determine the design parameters of the described vibration isolators. The model of a disk spring as a combination of a separate disk spring and an annular section is proposed.
Conference Paper
Full-text available
The article is devoted to creating artificial gravity by oscillating systems with a quasi-zero stiffness. The paper suggests new way to create artificial gravity by oscillating systems with given force characteristics. method of calculating the parameters of the proposed oscillatory system to obtain the desired "linear" force characteristics based...
Article
Full-text available
The negative effect of vibration on entities used for the transport of oil and gas is analyzed. Systems with quasi-zero stiffness are employed as vibration isolators with a low natural-vibration frequency. The effectiveness of such use is experimentally confirmed. A promising design of a compact effective vibration isolator and a method for moderni...
Conference Paper
Full-text available
The report is devoted to oscillations of damping system with discontinuous force characteristics. The unusual behavior of such a system is established. The system with permanent force characteristic and a system with a part with zero recovering force are considered.
Article
Full-text available
Modern construction requirements of pipeline protection in seismic active regions are analyzed according normative-technical documents. The principles of protective constructions in these regions are discussed. The construction of a principally new type of a pipeline support is offered and calculated, which provides protection of the object in 3 di...

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Projects

Projects (3)
Project
The goal is to create diagnostics systems that works automatically can identify defects in real time. The system uses vibration and tenso information.
Project
The goal is to create material with complex internal structure that can provide quasi-zero stiffness.
Project
The goal is to create universal compact passive vibration isolators with quasi-zero stiffness.