Numerical analysis of a three-dimensional branched pipeline using special software designed for estimation of the strength of the equipment of nuclear power plants

Оrynyak, І. V.; Torop, V. M.; Romashchenko, V. A.; Zhurakhovskii, S. V.

doi:10.1007/bf02811281

Cited by 15 publications

(7 citation statements)

References 4 publications

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“…(5) describing the relation between the parameters at the beginning and at the end of the segment are written for all 12 unknowns, then, by analogy with (7), we can obtain the relation between the parameters at the end of the nth segment and at the beginning of the first one: The statement of the problem is completed by the rules of traversal of a branched 3D beam system for compiling the equations of relation of type (5), equations for supports, and fitting conditions of type (12) in the presence of concentrated forces and moments. All these procedures and equations are absolutely identical to those in static analysis [25]. They were used in the development of the software system "3D PipeMaster" for the calculation of the SSS for branched pipelines.…”

Section: Simulation Of Pipe Bends With the Use Of Straight Beamsmentioning

confidence: 99%

Calculation of natural and forced vibrations of a piping system. Part 1. Analysis of vibrations of a 3D beam system

2007

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Dynamic behavior of piping as a beam system has been analyzed with the use of the dynamic stiffness method. According to this method, the equations describing the relation between unknown parameters are written by the method of initial parameters, therefore, the solution procedure is similar to that for a static problem. It is shown that for curvilinear beams it is simpler and more efficient to apply a model that consists of straight segments and inertia-free rotation elements. To determine natural frequencies of 3D beam systems, it is proposed to use a method of disconnection of displacements, which makes it possible to discern the frequencies corresponding to different vibration modes (transverse, longitudinal, etc.). The approach allows a correct simulation of the system behavior under forced vibrations induced by a harmonic exciting force.

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Section: Simulation Of Pipe Bends With the Use Of Straight Beamsmentioning

confidence: 99%

Calculation of natural and forced vibrations of a piping system. Part 1. Analysis of vibrations of a 3D beam system

2007

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“…The SSS of the crossing with regard for the influence of underground sections is found by using the "3D PipeMaster" software complex. This complex is used for the numerical analyses of complex three-dimensional multiloop branched pipeline systems under static and dynamic loads [4][5][6][7]. In this case, the computational scheme may simultaneously include surface and underground sections with regard for different types of interaction of the pipeline with the soil.…”

Section: Preliminary Static Analysis Of the Air Crossingmentioning

confidence: 99%

Analysis of the stress-strain state of an air crossing of pipeline in the course of repair

et al. 2009

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We propose a procedure for the numerical analysis of the stress-strain state and criteria of its admissible state in the course of repairs of the air crossings of gas mains with regard for possible defects of the pipe metal. Using the "3D PipeMaster" software complex, we compute different versions and present recommendations concerning the optimal location of pipe-laying machines with an aim of realization of the possibility of lifting the pipe to a height required for repair works with guaranteed validity of the prescribed conditions of strength. The values of tractive forces in the pipe-laying machines are determined. The optimal sites of fixing the pipeline in the transverse direction are indicated and the corresponding forces acting in the cables used to prevent the transverse motions of the pipeline are calculated.

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“…The stress-strain state analysis with account of its buried piping sections has been made with the help of the 3D PipeMaster which is used for evaluating the complex dimensional pipeline systems with multiple loops under static and dynamic loadings [2][3][4][5].…”

Section: Analysis Of the Existing Stress-strain State Of The Crossingmentioning

confidence: 99%

Investigation of the possibility and conditions for passing inspection gauges through the section of cable-stayed aerial pipeline crossing

et al. 2009

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We have performed calculations of stress-strain state of cable-stayed aerial pipeline crossing in the operation state and of the additional effect of the inspection gauge application. In order to assess efforts in the pipe and cable stays of the aerial crossing, we apply analytical solutions combined with numerical simulations using the 3D PipeMaster software system. This comprehensive analysis allows one to assess stresses in the critical zones of the crossing, as well as to develop recommendations on strengthening the structure of the aerial crossing before its in-line inspection.Introduction. Most of the main gas pipelines in Ukraine have been in service for more than 20 years. During this time, a large variety of different defects which can cause an accident occurs in them. An up-to-date and the most effective method for detecting defects in the pipelines is the in-line inspection which makes it possible to describe quite accurately geometry of defects with reference to the distance in kilometers. The inspection gauge runs through the long section of the gas pipeline (as a rule, between two compressor stations) which consists of a buried piping and aerial crossings.The problem is that the inspection gauge has its specific weight and runs through with some velocity which results in occurrence of the inertia forces within the curvilinear sections. Moreover, weight of the "debris layer" accumulated in front of the inspection gauge during its running through the gas pipeline is added to the weight of the inspection gauge. At the same time, the aerial pipeline crossings are high-loaded structures because, with a view to saving in metal, they have been designed with very low safety factors [1] as compared with other branches. If the internal pressure affects the acceptable state of the pipe metal, other loads (e.g., weight of the inspection gauge) can formally put the pipeline out of action.We present the analysis of the stress-strain state of the aerial crossing over the river Dniester of the main gas pipeline system (MGP) Ivatsevichi-Dolina, II line, length 456.3 km. As far as visual inspection has been made, inclination of pylons, pinching of cable stayes and deflection of the pipeline axis are observed. Such structural deviations from the design geometry require testing the strength of the crossing before the in-line inspection.Structural complexity creates a need in making a comprehensive analysis using the analytical and numerical procedures to evaluate the state of the pipe and cable stays. Moreover, calculations need to be performed for the current situation and taking into account the additional loading from the inspection gauge.

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Numerical analysis of a three-dimensional branched pipeline using special software designed for estimation of the strength of the equipment of nuclear power plants

Cited by 15 publications

References 4 publications

Calculation of natural and forced vibrations of a piping system. Part 1. Analysis of vibrations of a 3D beam system

Calculation of natural and forced vibrations of a piping system. Part 1. Analysis of vibrations of a 3D beam system

Analysis of the stress-strain state of an air crossing of pipeline in the course of repair

Investigation of the possibility and conditions for passing inspection gauges through the section of cable-stayed aerial pipeline crossing

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