Relaxation of the Bolted Flange Connection

2021 ◽  
Author(s):  
Robert Taylor
Keyword(s):  
Flange Connection ◽  
Bolted Flange

Three-Dimensional Numerical Analysis for Bolted Flange Joints Considering Effect of Creep

2018 ◽  
Author(s):  
Lewen Bi ◽  
Lanzhu Zhang
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Numerical Analysis ◽  
Yield Strength ◽  
Room Temperature ◽  
Three Dimensional ◽  
Short Term ◽  
Flange Connection ◽  
Petroleum Chemical ◽  
Bolted Flange

Bolted flange joints are widely used in petroleum, chemical, nuclear and power industries, etc. With more and more devices are used at high temperature, the performance of flange connections becomes more complex, especially with creep of different components in flange connection. At elevated temperature, with the loss of bolt force and gasket force due to creep, the joints are prone to leak. Based on this, this paper analyzed the relaxation of bolt force at elevated temperature due to creep of bolt, flange and gasket separately and simultaneously. Besides, the influence of different initial installation stress of bolts was also studied. The results showed bolted flange joints relaxed due to gasket creep during early short term service. However, contribution of bolt and flange creep became more and more significant with the extension of time. With considering the creep of bolt, flange and gasket simultaneously, 50% to 60% of the bolt material yield strength at room temperature was recommended as the bolt initial installation stress for the joint case studied in this paper.

Investigation on Different Tightening Sequences on Several Bolted Flange Types, Dimensions and Their Associated Gasket Types

2011 ◽  
Author(s):  
Hubert Lejeune ◽  
Yves Birembaut ◽  
Alexander Riedl ◽  
Arne Schunemann
Keyword(s):  
Quality Factor ◽  
Type A ◽  
Strain Gauges ◽  
Flange Connection ◽  
Elapsed Time ◽  
Torque Wrench ◽  
The Us ◽  
Bolted Flange

In the last years, several projects have been performed on alternative tightening sequences in the US and in Japan. This work has led to the publication of documents introducing alternative tightening procedures as JIS B 2251:2008 / HPIS Z 103 TR (JAPAN) and the new revision of ASME PCC-1:2010. In this study, the required bolt torque is calculated according EN1591-1 [1] (EN standard for bolted flange calculation according to a given tightness class) to achieve a given tightness class for each investigated gasket (6 types) and flange type (CLASS/PN)/dimension (from 4″/DN100 to 16″/DN400). The calculated bolt torque is then applied using a hydraulic torque wrench following three tightening sequences based on Legacy cross-pattern of ASME PCC-1:2010, alternative pattern #1 of ASME PCC-1:2010 and HPIS Z 103 TR. The bolted flange connection is then pressurized with Helium. The load for each bolt is continuously monitored using strain gauges, through the bolt-up phase and during pressurization. The average obtained bolt load, the bolt load scatter, the evolution of bolt load versus passes and elapsed time are compared for all the tested configurations (tightening sequence/ bolted flange type & dimension/ gasket type). A “Quality factor” is defined enabling comparison between the tightening quality (according to several criteria) of the different investigated tightening sequences in the tested configurations.

Effect of Gasket Compression Resilience on the Tightness of Bolted Flange System

2016 ◽  
Vol 853 ◽  
pp. 328-334
Author(s):  
Xiao Tao Zheng ◽  
Jia Lin Zi Pan ◽  
Jiu Yang Yu
Keyword(s):  
Room Temperature ◽  
Design Calculation ◽  
Compression Force ◽  
Working Pressure ◽  
Flange Connection ◽  
Connection System ◽  
Gasket Material ◽  
Bolted Flange ◽  
Nonlinear Performance ◽  
Flange Angle

Gasket is an important sealing element of bolted flange connection structure. The nonlinear performance of the gasket material will make the flange angle and gasket compression force change. Therefore, it plays an important role in the tightness of bolted flange connection system. Apart from acknowledgment of this effect, there exists no established design calculation procedure that accounts for tightness. In this paper, the mechanical properties of the gasket at room temperature were studied, it is known that the rebound performance of the gasket is related to the initial preload. And the effect of the compressive resilience of the gasket on the tightness of the bolt flange system was discussed. The tightness of the bolt flange system can be achieved by adjusting the initial preload and working pressure of the gasket, it provides the basis for design and evaluate the tightness of bolted flange connection system.

Axi-Symmetric Stress Analysis and Determination of Bolt Preload in Bolted Flange Connections With Cover of Pressure Vessel Subjected to Internal Pressure

2005 ◽  
Author(s):  
Toshiyuki Sawa ◽  
Satoshi Nagata ◽  
Yosuke Akita
Keyword(s):  
Internal Pressure ◽  
Pressure Vessel ◽  
Theory Of Elasticity ◽  
Body Contact ◽  
Flange Connection ◽  
Bolt Preload ◽  
Three Body ◽  
Bolted Flange ◽  
The Given ◽  
Spiral Wound

The stresses of a bolted flange connection with a cover of pressure vessel (CPV) in which a spiral wound gasket is inserted, under internal pressure are analyzed taking account a hysteresis of the gasket using the axi-symmetrical theory of elasticity as a three-body contact problem. In addition, for the verification of the analyses, finite-element calculations were also done. The Leakage tests were conducted for an actual bolted flange connection with a CPV and a spiral wound gasket. Using the calculated contact gasket stress distribution of the bolted flange connection with the CPV under internal pressure and the tightness parameter, the values of the new gasket constants were obtained by taking into account the changes in the contact gasket stress. A difference in the new gasket constants between the estimated values obtained from the actual bolted flange connection with the CPV and the values obtained by the PVRC procedure was small. In addition, a method to determine the bolt preload for a given tightness parameter was demonstrated. The obtained results of the bolt preload for the bolted flange connection with the CPV were in a fairly good agreement with those obtained by the PVRC procedure under a lower pressure application. However, a difference in the bolt preload was about 7% when the given tightness parameter was increased.

Transient response characteristics of a bolted flange connection structure with shear pin/cone

2017 ◽  
Vol 395 ◽  
pp. 240-257 ◽  
Author(s):  
Xu Lu ◽  
Yan Zeng ◽  
Yan Chen ◽  
Xuefeng Xie ◽  
Zhenqun Guan
Keyword(s):  
Transient Response ◽  
Flange Connection ◽  
Response Characteristics ◽  
Bolted Flange

552 The evaluations of bolted flange connection with spiral wound gasket under internal pressure

2015 ◽  
Vol 2015 (0) ◽  
pp. 152-153
Author(s):  
Akira Muramatsu ◽  
Khan Maksud Uddin ◽  
Kazuya Kurihara ◽  
Toshiyuki Sawa
Keyword(s):  
Internal Pressure ◽  
Flange Connection ◽  
Bolted Flange ◽  
Spiral Wound

FEM Stress Analysis and Sealing Performance in Bolted Flange Connections With Cover of Pressure Vessel Subjected to Internal Pressure

2003 ◽  
Author(s):  
Toshiyuki Sawa ◽  
Rie Higuchi
Keyword(s):  
Internal Pressure ◽  
Contact Stress ◽  
Pressure Vessel ◽  
The Finite Element Method ◽  
Flange Connection ◽  
Bolt Preload ◽  
Sealing Performance ◽  
Bolted Flange ◽  
Contact Stress Distribution ◽  
Spiral Wound

The stresses of a bolted flange connection with a cover of pressure vessel (CPV) in which a spiral wound gasket is inserted, under internal pressure are analyzed taking account a hysteresis of the gasket by using the finite element method (FEM). The leakage tests were also conducted using an actual bolted flange connection with a CPV with a spiral wound gasket. Using the contact stress distribution of the bolted flange connection with a CPV under internal pressure and the tightness parameter, the values of the new gasket constants were obtained by taking into account the changes in the contact stress. A difference in the new gasket constants between the estimated values obtained from the actual bolted flange connection with a CPV and the values obtained by the PVRC procedure was small. In addition, a method to determine the bolt preload for a given tightness parameter was demonstrated. The obtained results of the bolt preload for the bolted flange connection with a CPV were in a fairly good agreement with those obtained by the PVRC procedure under a lower pressure application. However, a difference in the bolt preload was about 7% when the internal pressure was increased.

FEM Analysis and Evaluation of the Sealing Performance in Flexible Box-Shape Flanged Bolted Joints With Gaskets Subjected to Internal Pressure: Effect of the Bolt Pitch

2007 ◽  
Author(s):  
Toshiyuki Sawa ◽  
Ryo Kurosawa ◽  
Yasuaki Tatsumi
Keyword(s):  
Internal Pressure ◽  
Fem Analysis ◽  
Bolted Joints ◽  
Stress Distributions ◽  
The Finite Element Method ◽  
Analysis And Evaluation ◽  
Flange Connection ◽  
Sealing Performance ◽  
Helium Gas ◽  
Bolted Flange

Bolted joints with gaskets such as non-circular flange connections have been widely used in mechanical structures, nuclear and chemical industry, and so on. They are usually used under internal pressure as well as other loadings such as thermal, impact loadings and so on. In designing the non-circular flange connections with gaskets, it is important to evaluate the sealing performance of the non-circular flange connections with gaskets subjected to internal pressure. An important issue is how to evaluate the sealing performance in the box-shape bolted flange connections by using the contact gasket stress distributions at the interfaces, how to reduce a number of bolt and nuts, that is, how to enlarge the bolt pitch, and how to determine the initial clamping bolt force (preload) by using the new gasket constants. In this paper, the stresses of box-shape flange connection with gaskets subjected to an internal pressure are analyzed using the finite element method (FEM), taking account a hysteresis in the stress-strain curves of the gasket. The contact gasket stress distributions when the internal pressure is applied to the connection are analyzed. The leakage tests were conducted using an actual box-shape flange connection with a gasket Using the contact gasket stress distributions at the interfaces under an internal pressure (Helium gas was used) and the amount of the leakage measured in the experiment, the sealing performances are evaluated experimentally and theoretically by changing the bolt pitch in the connections. Discussion is made on the effect of the bolt pitch on the sealing performance in the above connections.

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