The Application of ASME Code Case 1828

1979 ◽  
Vol 101 (1) ◽  
pp. 87-94 ◽  
Author(s):  
R. W. Schneider ◽  
E. O. Waters
Keyword(s):  
Metal Contact ◽  
Analysis And Design ◽  
Simplified Method ◽  
Asme Code ◽  
Simplifying Assumptions

ASME Code Case 1828: “A Simplified Method of Analyzing Flat Face Flanges with Metal-to-Metal Contact Outside the Bolt Circle” provides rules for the analysis and design of a wide variety of identical and nonidentical flange pairs. Although the method is based on certain simplifying assumptions, a designer may lose confidence in his solution of a problem because of the multiplicity of steps which are involved. Accordingly, the purpose of this paper is to demonstrate the application of Code Case 1828 by means of four illustrative problems and supporting discussion.

The Background of ASME Code Case 1828: A Simplified Method of Analyzing Part B Flanges

1978 ◽  
Vol 100 (2) ◽  
pp. 215-219 ◽  
Author(s):  
R. W. Schneider ◽  
E. O. Waters
Keyword(s):  
Pressure Vessel ◽  
Metal Contact ◽  
Analysis And Design ◽  
Division 1 ◽  
Simplified Method ◽  
Asme Code ◽  
Section Viii ◽  
Consistent Basis

The 1974 Edition of ASME Boiler and Pressure Vessel Code Section VIII, Division 1, provides rules for the analysis and design of identical pairs of Part B flanges (flat face flanges in metal-to-metal contact). The theory has been extended on a consistent basis to cover the analysis of a pair of nonidentical Part B flanges but since the resulting procedure is laborious, action to include the rules has been delayed pending further consideration by the cognizant ASME Code Committees. In the interim a simplified method suitable for analyzing both identical and nonidentical pairs of Part B flanges has been developed and is available as ASME Code Case 1828: “A SIMPLIFIED METHOD FOR ANALYZING PART B FLAT FACE FLANGES WITH METAL-TO-METAL CONTACT OUTSIDE THE BOLT CIRCLE.” The purpose of this paper is to describe the simplified method and to derive some of the more important equations which are contained in the Code Case.

Fitness-for-Service Strategies for Impulsively Loaded Vessels

2020 ◽  
Vol 143 (3) ◽  
Author(s):  
Thomas A. Duffey ◽  
Kevin R. Fehlmann
Keyword(s):  
Pressure Vessels ◽  
Material Behavior ◽  
Remaining Life ◽  
Structural Damping ◽  
Asme Code ◽  
Simplifying Assumptions ◽  
Section Viii ◽  
Repeated Use ◽  
Internal Blast Loading ◽  
Service Strategies

Abstract High-explosive containment vessels are often designed for repeated use, implying predominately elastic material behavior. Each explosive test imparts an impulse to the vessel wall. The vessel subsequently vibrates as a result of the internal blast loading, with amplitude diminishing exponentially in time after a few cycles due to structural damping. Flaws present in the vessel, as well as new flaws induced by fragment impact during testing, could potentially grow by fatigue during these vibrations. Subsequent explosive tests result in new sequences of vibrations, providing further opportunity for flaws to grow by fatigue. The obvious question is, How many explosive experiments can be performed before flaws potentially grow to unsafe limits? Because ASME Code Case 2564-5 (Impulsively Loaded Pressure Vessels) has just been incorporated in Section VIII, Division 3 of the 2019 ASME Boiler and Pressure Vessel Code, evaluation of remaining life and fitness-for-service of explosive containment vessels now draws upon two interrelated codes and standards: ASME Section VIII-3 and API-579/ASME FFS-1. This paper discusses their implementation in determining the remaining life of dynamically loaded vessels that have seen service and are potentially damaged. Results of a representative explosive containment vessel are presented using actual flaw data for both embedded weld flaws and fragment damage. Because of the potentially large number of flaws that can be detected by modern nondestructive inspection methods, three simplifying assumptions and a procedure are presented for conservatively eliminating from further consideration the vast majority of the flaws that possess considerable remaining life.

Finite Element Analysis and Design of a Horizontal Tank on Saddle Supports

2002 ◽  
Author(s):  
Afewerki H. Birhane ◽  
Yogeshwar Hari
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Code Design ◽  
Element Analysis ◽  
Analysis And Design ◽  
Finite Element Software ◽  
Asme Code ◽  
Design Function ◽  
Horizontal Tank ◽  
The Difference

The objective of this paper is to design and analyze a horizontal tank on saddle supports. The horizontal vessel is to store various chemicals used in today’s industry. The over all dimensions of the horizontal vessel are determined from the capacity of the stored chemicals. These dimensions are first determined. The design function is performed using the ASME Code Sec VIII Div 1. The horizontal tank design is broken up into (a) shell design, (b) two elliptical heads and (c) two saddle supports. The designed dimensions are used to recalculate the stresses for the horizontal vessel. The dimensioned horizontal vessel with saddle supports and the saddle support structure is modeled using STAAD III finite element software. The stresses from the finite element software are compared with the stresses obtained from calculated stresses by ASME Code Sec VIII Div 1 and L. P. Zick’s analysis printed in 1951. The difference in the stress value is explained. This paper’s main objective is to compare the code design to the finite element analysis. The design is found to be safe for the specific configuration considered.

Calculation of Bolted Flange Connections of Floating and Metal-to-Metal Contact Type

2003 ◽  
Author(s):  
M. Schaaf ◽  
J. Bartonicek
Keyword(s):  
Pressure Vessels ◽  
Metal Contact ◽  
Second Step ◽  
European Standard ◽  
Calculation Algorithm ◽  
Contact Type ◽  
Asme Code ◽  
Floating Type ◽  
Bolted Flange

In Europe, in 2001 the new standard EN 1591 for strength and tightness proofs of bolted flange connections (BFC) of floating type flanges was released. In addition, the German nuclear code was revised regarding the calculation of BFC. With this standard not only the floating type but also the metal-to-metal contact type of flanges (MMC) can be treated. Additionally, the ASME code is the basis for the flange calculation in the European standard EN 13445, which is the standard for unfired pressure vessels. In compliance with the goal of the calculation, the different calculation codes can be used. There must be a differentiation between the design of the components, the determination of the prestress values for assembly, the stress analysis and the tightness proof of the BFC. First, all parameters which influence the function of the bolted flange connection are considered. In a second step, the range of use of the different standards and the calculation algorithm are discussed.

Simplified propeller analysis and design including effects of stall

2016 ◽  
Vol 120 (1227) ◽  
pp. 796-818 ◽  
Author(s):  
L.W. Traub
Keyword(s):  
Small Angle ◽  
Design Methodology ◽  
Design Tool ◽  
Analysis Tool ◽  
Blade Design ◽  
Analysis And Design ◽  
Propeller Design ◽  
Vortex Theory ◽  
Simplified Method

ABSTRACTA simplified method to analyse propellers based on vortex theory is presented. Small-angle approximations are implemented to eliminate the need for iteration in the determination of the induced angle-of-attack. A stall model is developed and combined with analytic relations describing the blade aerofoil characteristics, eliminating the need for look-up tables of aerofoil behaviour. The method is also extended to serve as an optimal propeller design tool. Comparisons of the approach with experiment are presented for validation as an analysis tool. Use of the theory as a design tool is also demonstrated through contrast with an existing blade design methodology.

Thermochemical Solar Reactor: Simplified Method for the Geometrical Optimization at a Given Incident Flux

2010 ◽  
Vol 8 (1) ◽  
Author(s):  
Stefania Tescari ◽  
Pierre Neveu ◽  
Nathalie Mazet
Keyword(s):  
Heat Storage ◽  
Optimization Method ◽  
Constructal Theory ◽  
Operational Parameters ◽  
Incident Flux ◽  
Reactive Material ◽  
Optimal Geometry ◽  
Simplified Method ◽  
Temperature Heat ◽  
Simplifying Assumptions

This paper aims to describe a simplified method to optimize the geometry of a solar thermochemical reactor. As a first step, this paper focuses on a purely thermal analysis. The chemical reaction is represented by a uniform heat sink inside the material. The heat transfer modes are radiation in the empty part (cavity) and conduction inside the reactive material. The aim is to find the optimal geometry of the reactor, by maximizing its efficiency, for a fixed value of the incident solar flux and of the total volume of the reactor. An analytical solution can be found thanks to some simplifying hypothesis. The influence of different operational parameters on the maximal efficiency and on the optimal shape is studied. A comparison between different reactor designs (cylindrical and cavity reactors) is shown. A 2D study, based on CFD software using a finite element method, allows for quantifying the effects of the simplifying assumptions. The constructal theory aims to optimize the internal structure of a system in order to provide easier access to its internal currents and increase the system efficiency. Thus, this study can be seen as the optimization of the elemental volume of the constructal approach. In a next step this optimization method will be used to optimize more complex reactor design, as for example, a honeycomb reactor obtained by the assembling of several cavities, in order to optimize a thermochemical reactor for hydrogen production or high temperature heat storage.

Analytical Modeling of Flat Face Flanges With Metal-to-Metal Contact Beyond the Bolt Circle

2009 ◽  
Author(s):  
Hichem Galai ◽  
Abdel-Hakim Bouzid
Keyword(s):  
Analytical Modeling ◽  
Plate Theory ◽  
Beam Theory ◽  
Elastic Interaction ◽  
Bolted Joints ◽  
Metal Contact ◽  
Design Rules ◽  
Load Change ◽  
Asme Code ◽  
Analytical Approaches

Design rules for flat face flanges with metal-to-metal contact beyond the bolt circle are covered by Appendix Y of the ASME Code. These design rules are based on Schneider’s work [1]. The prediction of tightness of these bolted joints relies very much on the level of precision of the O-ring gasket compression during operation. The evaluation of this compression requires a rigorous flexibility analysis of the joint including bolt-flange elastic interaction. This paper analyses flange separation and the bolt load change in flat face bolted joints. It proposes two different analytical approaches capable of predicting flange rotation and bolt load change during operation. The first method is based on beam theory applied to a continuous flange sector. This approach is an improvement of the discrete beam theory used by Schneider [1]. The second method is based on circular plate theory and is developed for the purpose of a more accurate assessment of the load changes. As in the Taylor Forge method, this approach is in general better suited than the beam theory for flat face flanges in particular when the flange width is small. The proposed models are compared to the discrete beam theory and validated using numerical FEA on different flange sizes.

A New Simplified Approach to the Kinematic Analysis and Design of Epicyclic Gearboxes

1995 ◽  
Vol 209 (1) ◽  
pp. 49-53 ◽  
Author(s):  
A A Fogarasy ◽  
M R Smith
Keyword(s):  
Kinematic Analysis ◽  
Building Blocks ◽  
Kinematic Constraint ◽  
Simplified Approach ◽  
Analysis And Design ◽  
Constraint Equations ◽  
Epicyclic Gear ◽  
Simplified Method ◽  
New Type ◽  
Gear Drives

The present paper introduces a much simplified method for the kinematic analysis of epicyclic gear drives. It is based on the concept of the existence of only two basic building blocks and their kinematic constraint equations. These can easily be found by inspection of the relevant kinematic structural diagram. A new type of notation is used which is simpler and more versatile than those of previous methods and is adaptable to depicting the kinematic alternatives of any particular drive without the need for drawing structural diagrams.

Finite Element Analysis and Design of an Annular Tank

2003 ◽  
Author(s):  
Yogeshwar Hari
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Internal Pressure ◽  
Outer Cylinder ◽  
External Pressure ◽  
Seismic Load ◽  
Element Analysis ◽  
Analysis And Design ◽  
Finite Element Software ◽  
Asme Code

The objective of this paper is to design an annular tank. The annular tank is to store various criticality liquids used in today’s industry. The initial over all dimensions of the annular tank are determined from the capacity of the stored liquids. The design function is performed using the ASME Code Sec VIII Div 1. The annular tank design is broken up into (a) outer cylinder, (b) inner cylinder, (c) top cover, and (d) bottom head. It is supported at the bottom. It is anchored at the top. The deflection of the annular space is a critical requirement. Stresses are usually acceptable because the requirement is on the deflection. For vacuum condition the outer cylinder can be treated for external pressure and the inner cylinder can be treated for internal pressure. For internal pressure condition the design pressure consists of working internal pressure plus static head. For this the outer cylinder can be treated for internal pressure and the inner cylinder can be treated for external pressure. The covers are designed for internal pressure at the bottom where the pressure is the maximum. The designed dimensions are used to recalculate the stresses for the annular tank. The dimensioned annular tank is modeled using STAAD III finite element Software. The stresses from the finite element Software are compared to the stresses obtained from recalculated stresses obtained using ASME Code Sec VIII Div 1. The difference in the stress values is explained. This paper’s main objective is to compare the ASME Code to the finite element analysis. The design is found to be safe for the specific configuration considered. In addition the annular tank is checked for temperature and seismic load conditions, which the code does not address.

scholarly journals Simplified Irregular Beam Analysis and Design

2019 ◽  
Vol 5 (7) ◽  
pp. 1577-1589
Author(s):  
Mohammed Salem Al-Ansari ◽  
Muhammad Shekaib Afzal
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Reinforced Concrete Beams ◽  
Structural Safety ◽  
Simple Method ◽  
Analysis And Design ◽  
Shaped Beam ◽  
Finite Element Software ◽  
Strength Design ◽  
Simplified Method

This paper presents simple method to estimate the strength design of reinforced concrete beam sections based on structural safety and reliability. Irregular beam shaped sections are commonly used nowadays in the construction industry. This study reveals the simplified method to analyze and design the different irregular shaped beam sections. In this study, the selected irregular beam shaped sections are divided mainly into three groups, beams with straight edges, beams with sloped edges and circular beams. Each group contains the most commonly used beam shaped sections in that category. Six beams sections (B-1 to B-6) are selected for group-1 whereas five beam sections (B-7 to B-11) and a circular beam section (B-12) are chosen for group 2 and 3 respectively. Flexural beam formulas for three groups of reinforced concrete beams are derived based on section geometry and ACI building code of design. This study also analyzed numerical examples for some of the sections in each group category using the proposed simplified method to determine the strength design of the irregular beams. The results obtained using simplified method for all of the three groups are compared with the finite element software (SAP v2000). The percentage difference of simplified method with the finite element software ranges within 5% to 10%. This makes the simplified method for irregular shaped beam sections quite promising.

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