An Example of Bolted Joints in Pressure Vessels Under Fatigue Conditions

2007 ◽  
Author(s):  
I. Le May ◽  
R. Pascual
Keyword(s):  
Cyclic Loading ◽  
Fatigue Failure ◽  
Pressure Vessel ◽  
Pressure Vessels ◽  
Bolted Joints ◽  
Loading Conditions ◽  
Bending Stresses ◽  
Bolted Flange ◽  
Concentric Loading ◽  
Excellent Tool

Flanges in pressure vessels are, in most cases, submitted to non-concentric loading conditions producing bending stresses in the bolts that have to be taken into account for design purposes. The VDI 2230 Guideline [5] provides an excellent tool for the design of bolted joints, especially those in which the bolts are eccentrically loaded, as is commonly the case in pressure vessels. When cyclic loading conditions that can lead to fatigue failure are prevalent, special attention should be paid to the fatigue criteria used in the design. This paper will analyze the general principles of the design of bolted joints, giving particular attention to the use of the VDI 2230 Guideline. The calculation of the stiffness of the joints using this guideline will be introduced and a comparison with the more commonly used approaches will be made. Finally an example of the calculations involved in the design of a bolted flange in a pressure vessel will be shown and a comparison of the different design and fatigue criteria made.

The Fatigue Analysis of Pressure Vessels Based on Workbench

2012 ◽  
Vol 550-553 ◽  
pp. 3082-3087
Author(s):  
Xing Ye Su ◽  
Qin Li ◽  
Hong Mei Wang
Keyword(s):  
Fatigue Failure ◽  
Chemical Industry ◽  
Pressure Vessel ◽  
Petrochemical Industry ◽  
Rapid Development ◽  
Fatigue Analysis ◽  
Pressure Vessels ◽  
Operation Condition ◽  
Key Steps

With the rapid development of petrochemical industry, the operation condition of pressure vessels under the alternating load was increasing and the probability of fatigue failure was also on the rise. As a result, pressure vessel fatigue analysis is gaining the designer's attention. This paper describes the key steps and techniques of the fatigue analysis of pressure vessel based on Workbench platform using the lock hopper of the coal chemical industry as an example.

Support Analysis of Horizontal Pressure Vessel Using FEA

2014 ◽  
Vol 592-594 ◽  
pp. 1220-1224
Author(s):  
Navin Kumar ◽  
Surjit Angra ◽  
Vinod Kumar Mittal
Keyword(s):  
Stress Analysis ◽  
Pressure Vessel ◽  
Theoretical Basis ◽  
Pressure Vessels ◽  
Loading Conditions ◽  
Ansys Software ◽  
Support Design ◽  
Horizontal Pressure ◽  
The Given

Saddles are used to support the horizontal pressure vessels such as boiler drums or tanks. Since saddle is an integral part of the vessel, it should be designed in such a way that it can withstand the pressure vessel load while carrying liquid along with the operating weight. This paper presents the stress analysis of saddle support of a horizontal pressure vessel. A model of horizontal pressure vessel and saddle is created in Ansys software. For the given boundry and loading conditions, stresses induced in the saddle support are analyzed using Ansys software. After analysis it is found that maximum localized stress arises at the saddle to vessel interface near the saddle horn area. The results obtained shows that the saddle support design is safe for the given loading conditions and provides the theoretical basis for furthur optimisation.

Status of Research on Environmentally Assisted Cracking in LWR Pressure Vessel Steels

1988 ◽  
Vol 110 (2) ◽  
pp. 113-128 ◽  
Author(s):  
F. P. Ford
Keyword(s):  
Cyclic Loading ◽  
Crack Growth ◽  
Structural Integrity ◽  
Reaction Rates ◽  
Pressure Vessels ◽  
Crack Advance ◽  
Loading Conditions ◽  
Film Rupture ◽  
Life Evaluation ◽  
Environmentally Assisted Cracking

This paper reviews collaborative work that has the objective of defining, from first principles, the environmentally assisted crack growth rates in the Type A533B or A508 low-alloy steel/water system at 288°C under static and cyclic loading conditions. These theoretical rates are then used to assess the validity of the current ASME XI life evaluation code. The investigations, which were conducted by members of the International Cyclic Crack Growth Rate Group, have centered around (a) defining a working hypothesis for environmentally assisted cracking, (b) determining the nature and magnitude of crack tip environments and reaction rates that are pertinent to the crack advance hypotheses, (c) quantitatively validating a hypothesis by comparing observed and theoretical values, and (d) using the qualified mechanism to evalute the validity of current life-evaluation codes for environmentally assisted crack propagation. It is concluded that, on the basis of the bulk of present data, the slip dissolution (film rupture) model seems to be quantitatively the most valid crack advance mechanism for this system at 288°C. However, under certain system conditions, it is possible that an additional advance component due to environmentally assisted cleavage may become significant. Regardless of these nuances, however, it is apparent that the current ASME XI code is probably conservative for extended cyclic loading conditions, and that a time-based (rather than a cyclic-base) code would give a more realistic assessment of the structural integrity for the expected range of load/time histories in pressure vessels.

Design for Buckle-Free Shapes in Pressure Vessels

1985 ◽  
Vol 107 (4) ◽  
pp. 387-393 ◽  
Author(s):  
W. Szyszkowski ◽  
P. G. Glockner
Keyword(s):  
Pressure Vessel ◽  
Nonlinear Differential Equations ◽  
Closed Form Solution ◽  
Numerical Procedure ◽  
Pressure Vessels ◽  
Form Solution ◽  
Loading Conditions ◽  
Loading Case ◽  
Present Design ◽  
Axisymmetric Structures

There are many applications of thin-walled axisymmetric structures as pressure vessels in which buckle-free in-service behavior can only be guaranteed by reinforcements, such as stringers and girths, which not only raise the weight of the structure but also increase its cost. Buckle-free behavior, however, can also be assured by “correcting” the shape of the pressure vessel by a small amount in the area of impending instability. This paper proposes the use of the theory of inflatable membranes to obtain the shape of a pressure vessel subjected to tension only stress state, whereby the possibility of buckling is excluded. Such a shape will be referred to as the “buckle-free” shape. A set of nonlinear differential equations are derived which are valid for any axisymmetric pressure vessel subjected to axisymmetric loadings. The shape obtained from the solution of the equations is an “extremum” to possible stable shapes under the given loading conditions; i.e., there are other stable shapes, for which the circumferential compressive stiffness of the structure has to be relied upon. A closed-form solution for the set of equations was obtained for the constant pressure loading case. For hydrostatic pressure a numerical procedure is applied. Results on “buckle-free” shapes for typical pressure vessel strucures for these two loading conditions are presented. It is established that the deviation of such shapes from the shapes obtained by present design methods and code specifications is small so that this proposed method and the resulting “corrections’ leading to “buckle-free” inservice behavior should not present an aesthetic problem in design.

Optimizing the Interface of Cylinders in Composite Design of Pressure Vessels

1983 ◽  
Vol 22 ◽  
Author(s):  
Donald H. Newhall
Keyword(s):  
Fatigue Failure ◽  
Pressure Vessel ◽  
Pressure Vessels

ABSTRACTA method is presented of designing optimum proportions for cylinders in the composite design of a pressure vessel that limits catastrophic fatigue failure.

Cyclic Loading of Thick Pressure Vessels

2006 ◽  
Author(s):  
H. Mahbadi ◽  
M. R. Eslami
Keyword(s):  
Cyclic Loading ◽  
Iterative Method ◽  
Pressure Vessels ◽  
Structural Behavior ◽  
Loading Conditions ◽  
Mechanical Loads

In this article cyclic loading of thick cylindrical and spherical vessels under thermal and mechanical loads are investigated. A new and efficient numerical iterative method is proposed and used to analyze the structural behavior under cyclic loading conditions. The results are verified with the known data given in the literature.

Influence Coefficients and Pressure Vessel Analysis

1960 ◽  
Vol 82 (3) ◽  
pp. 259-267 ◽  
Author(s):  
G. D. Galletly
Keyword(s):  
Pressure Vessel ◽  
Shell Theory ◽  
Pressure Vessels ◽  
Toroidal Shell ◽  
Stress Distributions ◽  
Specialized Knowledge ◽  
Influence Coefficients ◽  
Final Stress ◽  
Bending Stresses ◽  
Accurate Stress

A description is given of the utility of influence coefficients for analyzing pressure vessels. To illustrate their advantages two relatively complex problems were selected and their final stress distributions calculated. The problems were (i) a cylinder closed by a torispherical head and (ii) a cylinder joined to a smaller cylinder by an ellipsoidal-toroidal shell. Two vessels were analyzed using influence coefficients which have recently become available. It is shown that accurate stress distributions can be obtained quickly and that a specialized knowledge of shell theory is not required. The method also shows the distribution of bending stresses throughout the shells. These latter, which can be important, are usually ignored by the various codes.

Joint strength of gasketed bolted pipe flange joint under combined internal pressure plus axial load with different (industrial and ASME) bolt-up strategy

2015 ◽  
Vol 231 (3) ◽  
pp. 555-564 ◽  
Author(s):  
Niaz B Khan ◽  
Muhammad Abid ◽  
Mohammed Jameel ◽  
Hafiz Abdul Wajid
Keyword(s):  
Internal Pressure ◽  
Axial Loading ◽  
Pressure Vessels ◽  
Bolted Joints ◽  
Combined Loading ◽  
Element Analysis ◽  
Design Procedures ◽  
Sealing Failure ◽  
Bolted Flange ◽  
Pipe Joint

Gasketed bolted flange joints are used in process industry for connecting pressure vessels and pipes. Design procedures available in the literature mostly discuss structural strength, while sealing failure is still a big concern in industries. Similarly, limited work is found in the literature regarding performance of gasketed bolted joints under combined loading. A detailed 3D nonlinear finite element analysis is performed to study the strength and sealing of a gasketed bolted flanged pipe joint under different bolt-up strategy (Industrial and ASME) and under combined internal pressure and axial loading.

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