Account for Metal to Metal Contact Between Gasket Centering Ring and Flange Facing in Calculation Using the XP CEN\TS 1591-3 Method: Comparison With Other Analytical Method and Finite Element Analysis

2014 ◽  
Author(s):  
Hubert Lejeune ◽  
Yann Ton That
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Calculation Method ◽  
Analytical Calculation ◽  
Technical Specification ◽  
Method Comparison ◽  
Metal Contact ◽  
European Standard ◽  
Element Analysis ◽  
Bolted Flange

The european standard EN1591-1 [1], initially published in 2001, defines a calculation method for bolted gasketed circular flanges, alternative to the TAYLOR-FORGE method, used as the basic method in most codes. In 2007, a new part, XP CEN/TS 1591-3 [2], has been added to the EN1591 series. This technical specification enables to take into account the Metal to Metal Contact (MMC), appearing inside the bolt circle on some assemblies. Due to a lack of industrial feedback and detailed validation, this document has not been raised to the standard status. In that context, under the request of its Pressure Vessel and Piping commission, CETIM has performed a study comparing this calculation method to Finite Element Analysis (FEA) on several industrial configurations. After a description of the XP CEN/TS 1591-3 calculation method, the major results obtained for spiral wound gasketed joints where MMC appears between centering ring and flange facing are presented and compared with FEA results. Moreover, results obtained with other classical analytical calculation methods as TAYLOR FORGE and EN1591-1 on the same Bolted Flange Connections (BFC) configuration are also analysed and compared to XP CEN/TS 1591-3 results.

3-D Non-Linear Finite Element Analysis of a Non-Gasketed Flange Joint Under Combined Internal Pressure and Axial Loading

2007 ◽  
Author(s):  
Muhammad Abid ◽  
Abdul W. Awan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Internal Pressure ◽  
Structural Integrity ◽  
Experimental Studies ◽  
Axial Loading ◽  
External Loading ◽  
Flange Joint ◽  
Element Analysis ◽  
Bolted Flange

A number of analytical and experimental studies have been conducted to study ‘strength’ and ‘sealing capability’ of bolted flange joint only under internal pressure loading. Due to the ignorance of the external i.e. axial loading, the optimized performance of the bolted flange joint can not be achieved. A very limited work is found in literature under combined internal pressure and axial loading. In addition, the present design codes do not address the effects of axial loading on the structural integrity and sealing ability of the flange joints. From previous studies, non-gasketed joint is claimed to have better performance as compared to conventional gasketed joint. To investigate non-gasketed joint’s performance i.e. joint strength and sealing capability under combined internal pressure and any applied external loading, an extensive 3D nonlinear finite element analysis is carried out and overall joint performance and behavior is discussed.

Finite Element Analysis of Behavior of Bolted Flange Connections under Bending Loading

2010 ◽  
Vol 26-28 ◽  
pp. 1168-1171
Author(s):  
Bin Wu ◽  
Tao Wang ◽  
Chao Xu ◽  
Bing Xu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Nonlinear Behavior ◽  
Initial Step ◽  
Nonlinear Phenomena ◽  
Sharp Change ◽  
Element Analysis ◽  
Bolted Flange ◽  
Bending Loading

Only a limited number of experimental and analysis reports exist concerning bolted flange connections under bending loading. In order to investigate the complex nonlinear phenomena, three dimensional elasto-plastic finite element analyses are performed. In those analyses, frictional contact model with small sliding option is applied between contacting pair surfaces of all connecting elements. Bolt pretension force is introduced in the initial step of analysis. From this study, the following results are obtainted:1) proposed finite element analysis method can be applicable to estimate complex nonlinear behavior of bolted flange type connections; 2) There is a sharp change in bending stiffness during loading, and lateral slip between two jointed flanges cause the bolt to carry shear load. The design of bolted joints should consider the interaction among cylinders, flanges and bolts.

scholarly journals Finite Element Analysis and Calculation Method of Residual Flexural Capacity of Post-fire RC Beams

2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Bin Cai ◽  
Bo Li ◽  
Feng Fu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Calculation Method ◽  
Concrete Cover ◽  
Fe Model ◽  
Fire Tests ◽  
Rc Beams ◽  
Fire Exposure ◽  
Flexural Capacity ◽  
Element Analysis

Abstract Fire tests and subsequent bending tests of four reinforced concrete (RC) beams were performed. Based on these tests, the post-fire performance of RC beams was further studied using finite-element simulation through reasonable selection of suitable thermal and thermodynamic parameters of steel and concrete materials. A thermodynamic model of RC beams with three sides under fire was built using finite-element analysis (FEA) software ABAQUS. The FEA model was validated with the results of fire tests. Different factors were taken into account for further parametric studies in fire using the propsed FE model. The results show that the main factors affecting the fire resistance of the beams are the thickness of the concrete cover, reinforcement ratio of longitudinal steel, the fire exposure time and the fire exposure sides. Based on the strength reduction formula at high temperature of steel and concrete and four test results, an improved section method was proposed to develop a calculation formula to calculate the flexural capacity of RC beams after fire. The theoretical calculation method proposed in this paper shows good agreement with FEA results, which can be used to calculate the flexural capacity of RC beams after fire.

Nonlinear Deformation Behavior of Bolted Flanges Under Tensile, Torsional and Bending Loads

2010 ◽  
Author(s):  
Zhijun Wu ◽  
Sayed A. Nassar ◽  
Xianjie Yang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Deformation Behavior ◽  
Nonlinear Deformation ◽  
External Loading ◽  
Element Analysis ◽  
Linear Deformation ◽  
Element Simulation ◽  
Bending Loads ◽  
Bolted Flange

This paper investigates the nonlinear deformation behavior of bolted flanges under tensile, torsional and bending loads, using Finite Element Analysis (FEA). Even though the bolted flange may still deform elastically, the variation in contact area due to the external loading will cause nonlinear deformation. In this study, finite element simulation is used for investigating the respective non-linear deformation behavior of a preloaded bolted flange under tensile, torsional and bending loads, and to determine the corresponding stiffness values for each loading.

Design of a Large Rectangular Flange

2006 ◽  
Author(s):  
Bharat Batra
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Horizontal Plane ◽  
Element Analysis ◽  
Acceptable Solution ◽  
Bolt Preload ◽  
The Finite Element Analysis ◽  
Section Viii ◽  
Design Challenge ◽  
Bolted Flange

A large rectangular flange (5’ wide × 12.5’ Long) was designed using finite element analysis for a horizontal mixer vessel. The mixer vessel contained a large horizontal agitator with the shaft protruding through the two flat ends of the vessel. The horizontal vessel was split in the middle horizontal plane creating a large rectangular opening to be sealed by the two large rectangular flanges. The size of the flange, the type of gasket, the bolt preload required to obtain a reasonable seal made it a design challenge to design this bolted flange assembly. To start with, an estimate was made based on the calculation of the thickness of the flange using an equivalent circular flange. The finite element analysis of the whole assembly was preformed using the FEA software ANSYS. After several iterations, an acceptable solution was found with acceptable flange and bolt stresses. The seating stress in the gasket was also above the recommended gasket seating stress. Thus, the flanged joint was designed to be in compliance with ASME B&PV Code, Section VIII, Div-1. The vessel and the bolted flange assembly was successfully fabricated and hydrotested based on this design and it is successfully operating in the field.

Determination of the Gasket Stress Distribution

2017 ◽  
Author(s):  
Manfred Schaaf
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Stress Analysis ◽  
Radial Direction ◽  
Fundamental Principle ◽  
European Standard ◽  
Calculation Algorithm ◽  
Element Analysis

The European Standard EN 1591-1 is used for the calculation of bolted flanged joints, stress analysis as well as for tightness proofs. In this calculation procedure gasket characteristics according to EN 13555 are used to describe the mechanical and the tightening behavior of gasket materials. With further developments in the calculation algorithm and the use of the realistic gasket behavior in the calculation more detailed results can be obtained, which are comparable to results obtained from Finite Element Analysis. The flange rotation and the resulting uneven gasket stress distribution in the radial direction during the assembly of the flanged joint is the fundamental principle in this development. The effective compressed gasket width has influence on the required gasket forces for the tightness proof as well as on the mechanical behavior of the flanged joint, and thus also on the stress analysis. In this paper, the determination of the effective gasket width using a newly developed approach [1] is optimized and the verification of this approach with Finite Element Analysis for several different gasket materials and flange geometries is shown.

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