scholarly journals Non-contact method of estimation of stress-strain state of underground pipelines during transportation of oil and gas

2020 ◽  
Vol 109 ◽  
pp. 17-32
Author(s):  
Paweł DROŹDZIEL ◽  
Tetiana VITENKO ◽  
Liubomyr ZHOVTULIA ◽  
Andrii YAVORSKYI ◽  
Andrii OLIINYK ◽  
...  
Keyword(s):  
Strain State ◽  
Oil And Gas ◽  
Contact Method ◽  
Safe Operation ◽  
Underground Part ◽  
Stress Strain ◽  
Stress Strain State ◽  
Underground Pipelines ◽  
Set Of Points ◽  
Main Gas Pipeline

Development and implementation of contactless methods for determining the stress-strain state of pipelines in the process of transportation of energy hydrocarbons is important for ensuring its safe operation. The authors developed a method for determining the change in the stress-strain state of the underground part of the main oil and gas pipelines according to the data about the displacement of a certain set of points of the axis of the pipeline. This study was conducted on a linear section of the main gas pipeline, where a landslide in 2010 created a force pressure on the pipeline, resulting in a pipeline rupture.

scholarly journals CONTROL OF ACTIONS OF STEEL TANK IN WORKING

2018 ◽  
Vol 22 (4) ◽  
pp. 66-74 ◽  
Author(s):  
A. A. Vasilkin
Keyword(s):  
Strain State ◽  
Low Cycle Fatigue ◽  
Operating Conditions ◽  
Maximum Effect ◽  
Safe Operation ◽  
Stress Strain ◽  
Load Bearing ◽  
Stress Strain State ◽  
Steel Tank ◽  
Steel Tanks

In steel tanks made by the method of rolling, defects of a geometric shape often occur in the area of the welded welded joint of the wall. Subsequently, in these areas, as a result of low cycle fatigue, an unacceptable defect appears in the form of a crack, which makes it necessary to remove the reservoir from operation and carry out a set of measures for its repair. To determine the terms of safe operation of vertical steel tanks with geometric defects, it is proposed to use the methodology control of the actions of structures of load-bearing structures, one of the directions of which is the regulation of the stress-strain state of steel structures. To implement the possibility of regulating construction, it is necessary to identify such parameters, the change of which will give the maximum effect in achieving the set goals. As the indicated parameters, the design characteristics (material properties, design scheme, geometric characteristics) and factors of external influences (load, operating conditions) can act. To regulate the stress-strain state design of vertical steel tanks, the following regulators are proposed: product loading height, wall deflection arrow and permissible number of tank loading cycles. By numerical calculation of the VAT of the vertical steel tank design with geometric defects, the necessary values and values of the stress state are determined. Further, using known analytical dependencies from the field of fracture mechanics, it is possible to determine the permissible number of loading cycles of the reservoir before the appearance of a crack-like defect. The application of the methodology control of the actions of structures load-bearing structures, by means of a certain change in the established control parameters, allows increasing the number of loading cycles of the reservoir, thereby increasing the period of safe operation of the defective reservoir and thereby increasing the economic efficiency of the tank farm.

Stress-Strain State of Weightless Inhomogeneous Array with Cylindrical Hole

2014 ◽  
Vol 919-921 ◽  
pp. 740-743 ◽  
Author(s):  
Vladimir I. Andreev
Keyword(s):  
Strain State ◽  
Cylindrical Hole ◽  
Local Inhomogeneity ◽  
Stress Strain ◽  
Stress Strain State ◽  
Underground Pipelines ◽  
Deformation Properties ◽  
Cylindrical Holes ◽  
Blasting Method

When creating underground pipelines, tunnels and other long cylindrical holes often used drilling-and-blasting method of penetration. Depending on the type of rock in the array may be local induration or sintering which results in increase in the deformation properties of the ground, or cracking resulting in a decrease in deformation properties. Thus the array becomes inhomogeneous. The article provides a calculation of the stress-strain state of array considering its local inhomogeneity.

scholarly journals Stress-Deformed Condition at Different Angle of Scratch Inclination on Flat Cover of Hatch-Blade

2021 ◽  
Vol 346 ◽  
pp. 03096
Author(s):  
Aleksey Rubtsov ◽  
Zinur Mukhametzyanov ◽  
Petr Kulakov ◽  
Veronika Gracheva
Keyword(s):  
Strain State ◽  
Vertical Axis ◽  
Operating Conditions ◽  
Structural Elements ◽  
Technical Documentation ◽  
Safe Operation ◽  
Stress Strain ◽  
Stress Strain State ◽  
Axis Of Symmetry ◽  
Flat Cover

Defects of mechanical origin are quite often found on the structural elements of the devices of the production facilities of the fuel and energy complex. One of the most common mechanical defects is scratches and hairlines on the outer surface of the structural elements. The current regulatory and technical documentation establishes standards for the rejection of defects of various types, which provide for the decommissioning of objects with unacceptable defects for repair or subsequent dismantling. However, in most cases, mechanical defects such as scratches are within acceptable sizes and do not have a decisive effect on the life, reliability and safe operation of vessels and apparatus. However, the presence of such defects can change the stress-strain state of the object to a more unfavorable side, and therefore accelerate the process of accumulating damage at points of concentration of increased stresses. Subsequently, places with a concentration of increased voltages under certain operating conditions can be sources of premature destruction of the element and failure of the object as a whole. Therefore, the actual work is the simulation of the stress-strain state of the flat manhole cover with a scratch, having a different arrangement. In this work, the stress-strain state of the flat manhole cover is examined depending on the location of the scratch on it at a different angle relative to the vertical axis of symmetry of the cover.

scholarly journals Protective Measures during Construction of Ground Structures over Existing Underground Structures

2020 ◽  
Vol 19 (5) ◽  
pp. 377-383
Author(s):  
A. A. Dalidovskaya ◽  
V. G. Pastushkov
Keyword(s):  
Strain State ◽  
Negative Impact ◽  
Surface Structures ◽  
Underground Structures ◽  
Safe Operation ◽  
Stress Strain ◽  
Protective Measures ◽  
Stress Strain State ◽  
New Construction ◽  
The Impact

Today, there is an acute issue of ensuring the safe operation of buildings and structures located in the immediate vicinity of new construction. The process of performing works on the installation of load-bearing structures and their further operation can have a negative impact on already existing facilities. In this regard, the task of developing innovative methods and tools to ensure the safe operation of such structures as subway running tunnels is very urgent. To solve it, a reliable forecast of additional deformation and appointment of a complex of protective measures are required.  In addition, much attention should be paid to the numerical modeling of the system “surface structures – protective measures – underground structures”. As an example of assessing the impact of new construction, namely, the erection of surface structures over existing underground  ones, one  can  cite  the  construction  of  a transport  interchange  at  the  intersection  of  Nezavisimosty  Avenue with Filimonov Street. As protective measures, a protective screen on bored piles has been used here, which made it possible to minimize significantly dynamic and static effects on the lining of tunnels and other underground structures of the subway. Effectiveness of protection application is confirmed by the result of monitoring the stress-strain state of running tunnel structures at all stages of traffic  intersection construction. Protective measures and continuous monitoring of the stress-strain state in structures help to avoid accidents during construction and further operation. 

scholarly journals Study of the seismodynamics of spatially located underground pipelines with a nodal connection of non-orthogonal configuration

2021 ◽  
Vol 264 ◽  
pp. 02005
Author(s):  
Ibrakhim Mirzaev ◽  
Ruslan Kishanov ◽  
Nodirakhon Mansurova ◽  
Nematilla Nishonov ◽  
Mars Berdibaev
Keyword(s):  
Strain State ◽  
Numerical Results ◽  
Seismic Load ◽  
Stress Strain ◽  
Stress Strain State ◽  
Underground Pipelines

The article deals with the seismodynamics of underground pipelines of various configurations under spatial seismic influences. The stress-strain state of spatially located underground pipelines of complex orthogonal configuration at different angles of seismic load incidence was determined. Several problems were solved by analyzing numerical results of the seismodynamics of underground pipelines of complex orthogonal and non-orthogonal configurations.

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