Pub Date : 2018-12-31DOI: 10.28999/2514-541x-2018-2-4-303-309
J. Zhang, J. Xie
TO STUDY THE EFFECT of ground loading on the mechanical behaviour of buried pipelines, a three-dimensional pipeline-soil coupling model was established. The influences of ground load, radius-thickness ratio, internal pressure and elastic modulus of backfill soil on stress, displacement and section ovality of the pipeline were analysed in this paper. The results show that the high stress area appears at the top of the pipeline and the shape is an oval under the ground load. As the ground load increases, the stress concentration phenomenon appears on the left and right sides of the pipeline. As the radius-thickness ratio decreases, the ability of the pipeline to resist deformation increases and the stress zone at the top of the pipeline gradually decreases. As the elastic modulus of the backfill soil increases, the displacement of the pipeline section gradually decreases. With the increasing of the internal pressure, the stress and strain of the upper pipeline is reduced and the bottom stress of the pipelne is increased. Protective measures should be used for the buried pipelines in dangerous areas.
{"title":"Mechanical behaviour analysis of buried pipeline subject to ground loading","authors":"J. Zhang, J. Xie","doi":"10.28999/2514-541x-2018-2-4-303-309","DOIUrl":"https://doi.org/10.28999/2514-541x-2018-2-4-303-309","url":null,"abstract":"TO STUDY THE EFFECT of ground loading on the mechanical behaviour of buried pipelines, a three-dimensional pipeline-soil coupling model was established. The influences of ground load, radius-thickness ratio, internal pressure and elastic modulus of backfill soil on stress, displacement and section ovality of the pipeline were analysed in this paper. The results show that the high stress area appears at the top of the pipeline and the shape is an oval under the ground load. As the ground load increases, the stress concentration phenomenon appears on the left and right sides of the pipeline. As the radius-thickness ratio decreases, the ability of the pipeline to resist deformation increases and the stress zone at the top of the pipeline gradually decreases. As the elastic modulus of the backfill soil increases, the displacement of the pipeline section gradually decreases. With the increasing of the internal pressure, the stress and strain of the upper pipeline is reduced and the bottom stress of the pipelne is increased. Protective measures should be used for the buried pipelines in dangerous areas.","PeriodicalId":262860,"journal":{"name":"Pipeline Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128662724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-31DOI: 10.28999/2514-541X-2018-2-4-265-285
G. Pluvinage
STRAIN-BASED DESIGN (SBD) is preferred for situations where the loading of a pipeline is due to forces other than the internal pressure and produce large stress and strain in the pipe wall.STRAIN-BASED DESIGN (SBD) is preferred for situations where the loading of a pipeline is due to forces other than the internal pressure and produce large stress and strain in the pipe wall.Under constraint conditions due to the presence of defect, tensile strains are increased due to stress concentration and the critical strain is reduced due to stress triaxiality. Such cases can be considered in design using Defect Assessment Procedures (DAP). This paper presents an extensive review of SBD methods used for pipe defect assessment as: 1. critical global strain as a criterion for pipe defect assessment; 2. critical local strain as a criterion for pipe defect assessment; 3. strain intensity factor as a criterion for pipe defect assessment; 4. notch ductility factor (NDF); 5. strain-based design based on J integral; 6. strain-based design based on CTOD. This presentation follows a rapid description of the mechanism of ductile failure, the influence of triaxiality, and loading mode through Lode angle.
{"title":"Pipe defect assessment made by strainbased","authors":"G. Pluvinage","doi":"10.28999/2514-541X-2018-2-4-265-285","DOIUrl":"https://doi.org/10.28999/2514-541X-2018-2-4-265-285","url":null,"abstract":"STRAIN-BASED DESIGN (SBD) is preferred for situations where the loading of a pipeline is due to forces other than the internal pressure and produce large stress and strain in the pipe wall.STRAIN-BASED DESIGN (SBD) is preferred for situations where the loading of a pipeline is due to forces other than the internal pressure and produce large stress and strain in the pipe wall.Under constraint conditions due to the presence of defect, tensile strains are increased due to stress concentration and the critical strain is reduced due to stress triaxiality. Such cases can be considered in design using Defect Assessment Procedures (DAP). This paper presents an extensive review of SBD methods used for pipe defect assessment as: 1. critical global strain as a criterion for pipe defect assessment; 2. critical local strain as a criterion for pipe defect assessment; 3. strain intensity factor as a criterion for pipe defect assessment; 4. notch ductility factor (NDF); 5. strain-based design based on J integral; 6. strain-based design based on CTOD. This presentation follows a rapid description of the mechanism of ductile failure, the influence of triaxiality, and loading mode through Lode angle.","PeriodicalId":262860,"journal":{"name":"Pipeline Science and Technology","volume":"1996 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128229631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-31DOI: 10.28999/2514-541X-2018-2-4-295-302
A. A. Katanov, M. V. Likhovtsev, D. Bushnev
The first part of this paper, describing the isssues involved and the authors’ research proposal,was published in the September 2018 (Vol.2, No.3) issue of Pipeline Science and Technology. In this second part, the authors discuss their work in detail, and describe their conclusions.
{"title":"An evaluation of additional criteria for assessing the condition of oil terminal tanks with the aim of extending safe service life – Part 2","authors":"A. A. Katanov, M. V. Likhovtsev, D. Bushnev","doi":"10.28999/2514-541X-2018-2-4-295-302","DOIUrl":"https://doi.org/10.28999/2514-541X-2018-2-4-295-302","url":null,"abstract":"The first part of this paper, describing the isssues involved and the authors’ research proposal,was published in the September 2018 (Vol.2, No.3) issue of Pipeline Science and Technology. In this second part, the authors discuss their work in detail, and describe their conclusions.","PeriodicalId":262860,"journal":{"name":"Pipeline Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129001422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-30DOI: 10.28999/2514-541X-2018-2-3-221-230
U. Zhapbasbaev, E. S. Makhmotov, G. Ramazanova, Т. Т. Bekibaev
THIS PAPER PRESENTS the results of calculations for the technological parameters of batching oil blends with high-pour-point and high-viscosity at the Uzen-Atyrau section of the Uzen-Atyrau-Samara trunk pipeline, taking into account on-route heating, boosting and pumping-out. The optimisation criteria were the minimum total cost of power consumption by the pumping units and the preheaters.
{"title":"Calculations for energy-saving modes for batching oil blends in trunk pipelines","authors":"U. Zhapbasbaev, E. S. Makhmotov, G. Ramazanova, Т. Т. Bekibaev","doi":"10.28999/2514-541X-2018-2-3-221-230","DOIUrl":"https://doi.org/10.28999/2514-541X-2018-2-3-221-230","url":null,"abstract":"THIS PAPER PRESENTS the results of calculations for the technological parameters of batching oil blends with high-pour-point and high-viscosity at the Uzen-Atyrau section of the Uzen-Atyrau-Samara trunk pipeline, taking into account on-route heating, boosting and pumping-out. The optimisation criteria were the minimum total cost of power consumption by the pumping units and the preheaters.","PeriodicalId":262860,"journal":{"name":"Pipeline Science and Technology","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127857145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-30DOI: 10.28999/2514-541x-2017-1-2-153-160
F. Péterfalvi
Leak-detection systems (LDS) have become a standard component of pipeline-management systems. There are various reasons which may prompt the pipeline operator to introduce or modernize the LDS. It became necessary to introduce a new system for the MOL company’s pipelines because the previous system was out-of-date, and its operation was accompanied by a multitude of shortcomings. This article examines the real experience and long practical search carried out by MOL’s logistics department, thanks to which effective LDS functioning could be provided for pipelines which had been in long-term operation. Having considered the advantages and disadvantages of current technologies, pipeline characteristics, and operating conditions, the decision was taken to apply PWM (the pressure-wave method) as the basic method for detecting leaks. New LDS efficiency design factors were identified. Test results show that the new system has justified the calculated expectations for efficiency.
{"title":"Modernizing the leak-detection system for MOL’s oil-products pipelines - Part 1","authors":"F. Péterfalvi","doi":"10.28999/2514-541x-2017-1-2-153-160","DOIUrl":"https://doi.org/10.28999/2514-541x-2017-1-2-153-160","url":null,"abstract":"Leak-detection systems (LDS) have become a standard component of pipeline-management systems. There are various reasons which may prompt the pipeline operator to introduce or modernize the LDS. It became necessary to introduce a new system for the MOL company’s pipelines because the previous system was out-of-date, and its operation was accompanied by a multitude of shortcomings. \u0000This article examines the real experience and long practical search carried out by MOL’s logistics department, thanks to which effective LDS functioning could be provided for pipelines which had been in long-term operation. Having considered the advantages and disadvantages of current technologies, pipeline characteristics, and operating conditions, the decision was taken to apply PWM (the pressure-wave method) as the basic method for detecting leaks. New LDS efficiency design factors were identified. Test results show that the new system has justified the calculated expectations for efficiency.","PeriodicalId":262860,"journal":{"name":"Pipeline Science and Technology","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129103781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-30DOI: 10.28999/2514-541X-2017-1-2-129-142
V. Zholobov, D. I. Varybok, D. Egorov
THE HYDROBLOW PHENOMENON occurs when there is a sudden change in the flow rate of transported fluids. A shock wave, which is formed at the place where the flow changes, travels along the pipeline, interacting with equipment and dying down according to a specific law. It is rather labour-intensive, and takes a considerable amount of time, numerically to analyse the wave processes in order to draw up maximum-pressure diagrams. A substantial quantity of information obtained from numerical calculation using difference schemes is as yet unused. The aim of the present study is to find an analytical approach for constructing a maximum-pressure-envelope curve.
{"title":"An analysis of changes to transient processes occurring in trunk pipelines as a result of introducing drag-reducing agents","authors":"V. Zholobov, D. I. Varybok, D. Egorov","doi":"10.28999/2514-541X-2017-1-2-129-142","DOIUrl":"https://doi.org/10.28999/2514-541X-2017-1-2-129-142","url":null,"abstract":"THE HYDROBLOW PHENOMENON occurs when there is a sudden change in the flow rate of transported fluids. A shock wave, which is formed at the place where the flow changes, travels along the pipeline, interacting with equipment and dying down according to a specific law. It is rather labour-intensive, and takes a considerable amount of time, numerically to analyse the wave processes in order to draw up maximum-pressure diagrams. A substantial quantity of information obtained from numerical calculation using difference schemes is as yet unused. The aim of the present study is to find an analytical approach for constructing a maximum-pressure-envelope curve.","PeriodicalId":262860,"journal":{"name":"Pipeline Science and Technology","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116903158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-30DOI: 10.28999/2514-541x-2017-1-2-103-113
A. Makarenko
THIS PAPER EXAMINES the key issues in constructing algorithms for processing target information in fibre-optic trunk pipeline security systems. Deep learning methods are applied in order to implement the basic functions of the environmental recognition system in the pipeline area, in particular: detecting and classifying input signals, extracting signal-event tracks, and identifying events and their sources. This study also presents a plan for walkthrough development of algorithms for processing information based on deep-learning methods, from task assignment to reference implementation and prototype testing. The basic stages of the plan are illustrated by studies which were carried out during the development of algorithms for primary signal classification in the leak detection and activity monitoring system on behalf of AO Omega, Moscow.
{"title":"Technological aspects of deep-learning algorithm development for processing information in fibre-optic trunk pipeline security systems","authors":"A. Makarenko","doi":"10.28999/2514-541x-2017-1-2-103-113","DOIUrl":"https://doi.org/10.28999/2514-541x-2017-1-2-103-113","url":null,"abstract":"THIS PAPER EXAMINES the key issues in constructing algorithms for processing target information in fibre-optic trunk pipeline security systems. Deep learning methods are applied in order to implement the basic functions of the environmental recognition system in the pipeline area, in particular: detecting and classifying input signals, extracting signal-event tracks, and identifying events and their sources. This study also presents a plan for walkthrough development of algorithms for processing information based on deep-learning methods, from task assignment to reference implementation and prototype testing. The basic stages of the plan are illustrated by studies which were carried out during the development of algorithms for primary signal classification in the leak detection and activity monitoring system on behalf of AO Omega, Moscow.","PeriodicalId":262860,"journal":{"name":"Pipeline Science and Technology","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126991656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-30DOI: 10.28999/2514-541X-2017-1-2-115-128
V. M. Varshitsky, A. A. Bogach, O. Kozyrev, I. B. Lebedenko
The aim of the present study is to determine the maximum allowable pig-running speed which guarantees that the design position of above-ground sections of elevated pipelines is maintained during pigging or liquid cleaning. This paper presents the results of 3D computer modelling, showing the strain in an elevated expansion loop of a pipeline due to the impact of the inertia load during pigging or liquid slug running. The strain in the elevated expansion loop sections of the pipeline was modelled using the finite-element method in the LS-DYNA and ANSYS software packages. Calculations were made for four standard sections of pipeline with expansion loops. As a result, the extent of displacements could be determined for elevated pipelines. The modelling results were used to calculate the maximum pig-running speed at which the design position of the elevated pipeline is maintained. This article compares the results of calculations made using engineering techniques with those made using computer 3D modelling methods. It also presents a comparison of computer modelling performed using the ANSYS and LS-DYNA software packages.
{"title":"Determining the conditions for stability of elevated pipelines on supports while pigging","authors":"V. M. Varshitsky, A. A. Bogach, O. Kozyrev, I. B. Lebedenko","doi":"10.28999/2514-541X-2017-1-2-115-128","DOIUrl":"https://doi.org/10.28999/2514-541X-2017-1-2-115-128","url":null,"abstract":"The aim of the present study is to determine the maximum allowable pig-running speed which guarantees that the design position of above-ground sections of elevated pipelines is maintained during pigging or liquid cleaning. This paper presents the results of 3D computer modelling, showing the strain in an elevated expansion loop of a pipeline due to the impact of the inertia load during pigging or liquid slug running. \u0000The strain in the elevated expansion loop sections of the pipeline was modelled using the finite-element method in the LS-DYNA and ANSYS software packages. \u0000Calculations were made for four standard sections of pipeline with expansion loops. As a result, the extent of displacements could be determined for elevated pipelines. The modelling results were used to calculate the maximum pig-running speed at which the design position of the elevated pipeline is maintained. \u0000This article compares the results of calculations made using engineering techniques with those made using computer 3D modelling methods. It also presents a comparison of computer modelling performed using the ANSYS and LS-DYNA software packages.","PeriodicalId":262860,"journal":{"name":"Pipeline Science and Technology","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128591430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-30DOI: 10.28999/2514-541X-2017-1-2-85-93
Y. V. Lisin, D. Neganov, V. M. Varshitskiy
This article develops the methodology given in Ref.1 to calculate hydrostatic re-testing intervals for a pipeline section with growing crack-like defects. It examines sections with both growing crack-like defects and corrosion defects. The actual pressure-cycling factor is taken into account for crack-like defects. Modern techniques employed for periodic hydrostatic testing have been analysed to ensure the integrity of existing pipelines, and the benefits and limitations of various methods are described. Examples are given for calculating the hydrostatic re-testing interval for pipeline sections with growing crack-like and corrosion defects. This paper shows that where hydrostatic testing pressure is selected according to the actual operating pressure-cycling factor, the corrosion rate, impact-toughness characteristics, and cycling cracking-growth resistance of the pipeline steel, and the operating pressure, the required re-testing interval can be guaranteed.
{"title":"Studies of the damaging effect at various loads and hydrostatic test frequencies","authors":"Y. V. Lisin, D. Neganov, V. M. Varshitskiy","doi":"10.28999/2514-541X-2017-1-2-85-93","DOIUrl":"https://doi.org/10.28999/2514-541X-2017-1-2-85-93","url":null,"abstract":"This article develops the methodology given in Ref.1 to calculate hydrostatic re-testing intervals for a pipeline section with growing crack-like defects. It examines sections with both growing crack-like defects and corrosion defects. The actual pressure-cycling factor is taken into account for crack-like defects. Modern techniques employed for periodic hydrostatic testing have been analysed to ensure the integrity of existing pipelines, and the benefits and limitations of various methods are described. Examples are given for calculating the hydrostatic re-testing interval for pipeline sections with growing crack-like and corrosion defects. This paper shows that where hydrostatic testing pressure is selected according to the actual operating pressure-cycling factor, the corrosion rate, impact-toughness characteristics, and cycling cracking-growth resistance of the pipeline steel, and the operating pressure, the required re-testing interval can be guaranteed.","PeriodicalId":262860,"journal":{"name":"Pipeline Science and Technology","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132575673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-30DOI: 10.28999/2514-541X-2018-2-3-179-186
N. Goncharov, A. Yushin, D. V. Derkach
THE ARTICLE EXAMINES THE topical issues of vertical tank wall repair by means of welding insert plates into a temporary opening. Currently, welding of insert plates is hardly covered in public sources. Structural elements of steel tanks are subject to wear. Most repairs involve clearing of corrosion damages and distortions of geometric shape of walls, which require repair work. Cumulative operating history of steel tanks designed for crude oil and oil products storage indicates that a more detailed study is necessary to explore engineering problems relating to repair works and development of new repair technologies. One of the main issues encountered when manufacturing and repairing tanks are welding deformations, which reduce the strength and stiffness of metal structures, distort the size and shape of structures, and cause an overall reduction in the quality of repair works. The need to eliminate or partially reduce deformations increases the labour input required to manufacture the structure. The most promising way of improving the quality of repair work using the insert plate method is by choosing the optimal thermal welding cycle (TWC) modes, and selecting methods of TWC parameters control depending on the geometric dimensions of the insert plate and on the welding method. Based on analysis of the results of experimental studies, this article describes the ways to limit the impact of residual welding stresses and deformations on the geometric parameters of vertical steel tank walls during repair work by using insert plates. The analysis covers the impact of various technological factors on the parameters of the heat-induced distortion in the welding cycle. Computer modelling is proposed as a method to monitor the level of residual welding stresses and deformations. The main conclusion of this research is the need for the development and use of computer technology to monitor the level of stresses and deformations which arise during the welding process. The scientific research results presented here are aimed at addressing the issue of improving vertical tank reliability after repair works
{"title":"Study of how welding methods impact the stress build-up in storage tank walls","authors":"N. Goncharov, A. Yushin, D. V. Derkach","doi":"10.28999/2514-541X-2018-2-3-179-186","DOIUrl":"https://doi.org/10.28999/2514-541X-2018-2-3-179-186","url":null,"abstract":"THE ARTICLE EXAMINES THE topical issues of vertical tank wall repair by means of welding insert plates into a temporary opening. Currently, welding of insert plates is hardly covered in public sources. \u0000Structural elements of steel tanks are subject to wear. Most repairs involve clearing of corrosion damages and distortions of geometric shape of walls, which require repair work. Cumulative operating history of steel tanks designed for crude oil and oil products storage indicates that a more detailed study is necessary to explore engineering problems relating to repair works and development of new repair technologies. \u0000One of the main issues encountered when manufacturing and repairing tanks are welding deformations, which reduce the strength and stiffness of metal structures, distort the size and shape of structures, and cause an overall reduction in the quality of repair works. The need to eliminate or partially reduce deformations increases the labour input required to manufacture the structure. \u0000The most promising way of improving the quality of repair work using the insert plate method is by choosing the optimal thermal welding cycle (TWC) modes, and selecting methods of TWC parameters control depending on the geometric dimensions of the insert plate and on the welding method. \u0000Based on analysis of the results of experimental studies, this article describes the ways to limit the impact of residual welding stresses and deformations on the geometric parameters of vertical steel tank walls during repair work by using insert plates. The analysis covers the impact of various technological factors on the parameters of the heat-induced distortion in the welding cycle. Computer modelling is proposed as a method to monitor the level of residual welding stresses and deformations. \u0000The main conclusion of this research is the need for the development and use of computer technology to monitor the level of stresses and deformations which arise during the welding process. The scientific research results presented here are aimed at addressing the issue of improving vertical tank reliability after repair works","PeriodicalId":262860,"journal":{"name":"Pipeline Science and Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126540821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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