Design of an Optimum I-Beam Reinforcement for an API 620 Tank

2003 ◽  
Author(s):  
Yogeshwar Hari ◽  
Ram Munjal ◽  
Namit Singh
Keyword(s):  
Finite Element ◽  
American Petroleum Institute ◽  
Bottom Plate ◽  
Finite Element Software ◽  
Reinforcement Ring ◽  
Asme Code ◽  
Design Function ◽  
Tank Design ◽  
The One

The objective of this paper is to analyze an existing American Petroleum Institute (API) 620 Tank [10]. The API Tank had failed in the field. The tank is analyzed without reinforcement and with an optimum I-Beam reinforcement. The API Tank is used to store chemicals used in today’s industry. The initial over-all dimensions of the API Tank are determined from the capacity of the stored chemicals. The design function is performed using the ASME Code See VIII Div 1. The API Tank design is broken up into (a) bottom plate, (b) shell section with 9 mm thickness, (c) shell section with 8 mm thickness, (d) shell section with 7 mm thickness, (e) shell section with 6 mm thickness, (f) shell section with 5 mm thickness, (g) top head with 5mm thickness, (h) bolts, and (i) reinforcement ring. The designed dimensions are used to recalculate the stresses for the complete API Tank. The dimensioned API Tank without reinforcement is modeled first using STAAD III finite element software. The stresses from the finite element software are obtained. Next the API Tank with I-Beam reinforcement was modeled using STAAD III finite element software. Ten different I-Beams were considered for the present analysis. The main objective of this paper was to find the optimum I-Beam that resulted in safe reinforced configuration. Optimum I-Beam was considered to be the one that resulted in similar stresses for the beam as well as the tank. This assures elastic matching between the beam and the tank. The design is found to be safe for the I-Beam reinforced configuration considered.

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.

Determination of MAWP of a Slab Tank Using FEA

2006 ◽  
Author(s):  
Yogeshwar Hari
Keyword(s):  
Finite Element ◽  
Internal Pressure ◽  
Static Pressure ◽  
Working Pressure ◽  
Element Analysis ◽  
Short Side ◽  
Finite Element Software ◽  
Asme Code ◽  
Tank Design

The objective of this paper is to determine the maximum allowable working pressure per ASME Code [1] of a slab tank using finite element analysis [2]. The slab tank is to store various criticality liquids used in today’s industry. The slab tank has been designed on the basis of the capacity of the stored liquids. The slab tank design is consists of (a) two long side members, (b) two short side members, (c) top head, and (d) bottom head. The slab tank is supported from the bottom at a height by a rectangular plate enclosure. The heads are designed for internal pressure and static pressure at the bottom where the pressure is the maximum. The slab tank has been designed to withstand internal pressure plus static pressure due to liquid head. The procedure used to determine MAWP is as follows: (1) The dimensioned slab tank is modeled using STAAD III finite element software. (2) Two loading conditions are used: (a) internal pressure; (b) static pressure due to liquid head; (c) combined internal pressure plus static pressure. The maximum stress and deflection is evaluated at the above three conditions for determination of MAWP. The stress due to the static pressure due to liquid will remain the same. Only the stress due to internal pressure can be changed by changing the internal pressure. New internal pressure is calculated to meet the ASME code stress criteria, which then will be the MAWP condition. A procedure is established to determine the MAWP of slab tanks using FEA.

Reinforcement Analysis of a Slab Tank

2005 ◽  
Author(s):  
Yogeshwar Hari
Keyword(s):  
Finite Element ◽  
Internal Pressure ◽  
Side Member ◽  
Short Side ◽  
Channel Section ◽  
Finite Element Software ◽  
Head Pressure ◽  
Tank Design ◽  
Critical Requirement ◽  
Static Head

The objective of this paper is to reduce the stresses and deflection of an existing slab tank [2]. The slab tank is to store various criticality liquids used in today’s industry. The preliminary overall dimensions of the slab tank are determined from the capacity of the stored liquids. The slab tank design is broken up into (a) two long side members, (b) two short side members, (c) top head, and (d) bottom head. The slab tank is supported from the bottom at a height by a rectangular plate enclosure. The deflection of the linear space is a critical requirement. The deflection is controlled by providing external supports from the bottom at a height by adjustable bolts. The analysis of the slab tank showed excessive stresses at the concentrated supports. The slab tank was modified by providing reinforcement on the long side members. Several reinforcement arrangements were considered. The slab tank is subjected to two conditions. First, vacuum condition, the long side plates will deflect inwards. Second, internal pressure condition the design pressure consists of working internal pressure plus static head pressure. For this the long side plates will deflect outwards. The heads are designed for internal pressure at the bottom where the pressure is the maximum. The vacuum pressure is not critical. The dimensioned slab tank is modeled using STAAD III finite element software. The slab tank showed excessive stresses. The concentrated supports were removed. The long side member was reinforced by a Channel section. The slab tank analysis was simplified by modeling a single long side member and three cases of Channel section reinforcement were considered. The reinforced arrangement was analyzed by STAAD III finite element software. Further analysis by changing the Channel section by plate reinforcement was found to be better.

The mechanical effects of deposition patterns in welding-based layered manufacturing

2007 ◽  
Vol 221 (10) ◽  
pp. 1499-1509 ◽  
Author(s):  
M P Mughal ◽  
R A Mufti ◽  
H Fawad
Keyword(s):  
Finite Element ◽  
Material Properties ◽  
Three Dimensional ◽  
Layered Manufacturing ◽  
Source Material ◽  
Structural Effects ◽  
Temperature Dependent ◽  
Deposition Patterns ◽  
Finite Element Software ◽  
The One

This paper presents a finite element (FE)-based three-dimensional analysis to study the structural effects of deposition patterns in welding-based layered manufacturing (LM). A commercial finite element software ANSYS is used to simulate the deposition incorporating a double ellipsoidal heat source, material addition, and temperature-dependent material properties. Simulations carried out with various deposition sequences revealed that the thermal and structural effects on the workpiece are different for different patterns. The sequence starting from outside and ending at the centre is identified as the one which produces minimum warpage.

Study of Nonlinear Dynamic Behavior of a Typical Jacket Type Platform Under Environmental Loading (Wave and Current) and Blast Overpressure

2004 ◽  
Author(s):  
M. Dousti ◽  
A. R. M. Gharabaghi ◽  
M. R. Chenaghlou
Keyword(s):  
Finite Element ◽  
Dynamic Behavior ◽  
Persian Gulf ◽  
Nonlinear Dynamic ◽  
The Other ◽  
Plastic Strains ◽  
Environmental Loading ◽  
Finite Element Software ◽  
Blast Overpressure ◽  
The One

In this paper the behavior of a jacket platform, which is installed in Persian Gulf under blast overpressure, is evaluated and interaction between blast and operating environmental wave and current loads is studied. Using finite element software the whole parts of platform, which include topside and jacket sections are modeled. The real pressure of blast load is applied for conducting the analyses. The study involves elastic and elasto-plastic analyses, which in the last one (elasto-plastic) the geometry and material nonlinearity have been considered. In the studied platform the results show that the interaction between blast and operating environmental wave and current loads is negligible but the comparison between two models, the one in which the whole parts of platform are modeled and the other one which only topside is modeled indicates that there are appreciable differences between the axial plastic strains.

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.

A Modal Analysis of Eccentric Shaft of Caster Vibration Device

2012 ◽  
Vol 605-607 ◽  
pp. 1176-1180 ◽  
Author(s):  
Jia Lian Shi ◽  
Xu Yang ◽  
Da Dong Ma
Keyword(s):  
Finite Element ◽  
Harmonic Analysis ◽  
Modal Analysis ◽  
Natural Frequency ◽  
Elastic Element ◽  
The Other ◽  
Finite Element Software ◽  
Eccentric Shaft ◽  
The One ◽  
Elastic Constraints

The model of eccentric shaft of caster vibration device is built by finite element software ANSYS, and bearings are regarded as rigid constraints and elastic constraints.Firstly, regarding the bearings as rigid constraints, the nodes on the parts of eccentric shaft, which match with bearing,are exerted full constraints. Secondly, regarding bearings as elastic constraints, spring, which is built by elastic element combination 14, are used to replace the bearings. In addition, the full constraints are exerted on the one side of spring,and axial constraint are exerted on the other side. Afterwards make the modal analysis of eccentric shaft.Solve and extract the first six natural frequency and modal shape.Watch and analyse the breaking formal of eccentric shaft as it is in different mode. The basis are settled for instantaneous and harmonic analysis.

Modal Testing and Analysis of Z-Axis Supporting Plate for High–Speed PCB NC Drilling Machine

2014 ◽  
Vol 496-500 ◽  
pp. 1016-1019
Author(s):  
Ling He ◽  
Guo Huang ◽  
Heng Yu Wu ◽  
Ya Li Lei
Keyword(s):  
Finite Element ◽  
High Speed ◽  
Modal Testing ◽  
Bottom Plate ◽  
Signal Acquisition ◽  
Drilling Machine ◽  
Element Analysis ◽  
Finite Element Software ◽  
Before And After ◽  
Supporting Plate

A constraint condition finite element analysis mode of the high speed PCB drilling machine Z-axis bottom plate was established on the platform of Abaqus. And then an optimal structural mode of a Z-axis supporting plate was obtained by means of performing constraint modal analysis and dynamic analysis optimization on the structure of the Z-axis supporting plate. modal tests and analyses were performed on the Z-axis plate before and after the optimization with the application of an LMS vibration/dynamic signal acquisition and analysis system. The experimental results were shown that the tested Z-axis plate dynamic characteristics were basically consistent with the obtained Z-axis supporting plate mode from simulation analyses using the finite element software Abaqus. It was proved that using the finite element software was feasible for optimizing the Z-axis supporting plate structure.

Investigation of Differences in the Finite Element Solution of a Sample Fatigue Cumulative Usage Factor Calculation Problem

2011 ◽  
Author(s):  
Gary L. Stevens ◽  
Howard J. Rathbun ◽  
Timothy D. Gilman
Keyword(s):  
Finite Element ◽  
Expert Panel ◽  
Finite Element Solution ◽  
Advisory Panel ◽  
Element Solution ◽  
Sample Problem ◽  
Pressurized Water ◽  
Water Reactor ◽  
Finite Element Software ◽  
Asme Code

In November 2009, the Electric Power Research Institute (EPRI) assembled an Advisory Panel on Environmental Fatigue, consisting of various industry and vendor participants, whose charter is to provide insight and recommendations to EPRI (including the Pressurized Water Reactor (PWR) Materials Reliability Program (MRP), the Boiling Water Reactor Vessel and Internals Project (BWRVIP), and the Advanced Nuclear Technology (ANT) organizations) on conducting additional work and providing guidance associated with environmental fatigue. The goal of the panel is to identify areas in environmentally assisted fatigue (EAF) formulations, or application of the EAF formulations, contained in regulations and the ASME Code that may cause application difficulties, to determine where new research efforts are necessary to provide guidance or alternatives to application of these formulations, and to investigate industry design problems with a goal of identifying solutions to obtain near- and long-term relief. The Advisory Panel consists of various industry and vendor participants that have been engaged in the environmental fatigue topic over the past several years. As a part of the activities investigated by the Expert Panel, in 2010, a sample problem was defined for use in testing the application of proposed ASME Code Cases for evaluation of EAF using the EAF multiplier (Fen) correction factor methodology. The sample problem was provided to multiple industry organizations and regulators to be solved so that differences in approaches and methods applied to the sample problem could be identified and understood. The intent of this effort was to refine the Fen methodology to clarify issues that have been previously identified and its practical application to typical industry fatigue evaluation problems. NRC staff elected to participate in solving the sample problem and comparing solutions generated by the other participating organizations in order to more fully understand the issues with fatigue calculation methodologies, as well as to provide input and develop consensus on the evaluation approaches. The sample problem represents a simplified form of a traditional reactor pressure vessel-type evaluation for transient thermal stress analysis and fatigue cumulative usage factor (CUF) calculation of a representative piping component evaluated in accordance with ASME Code, Section III, Subarticle NB-3200 methods. This paper describes detailed investigation of differences between two solutions to the Expert Panel sample problem. This investigation involves comparisons of results from the initial finite element solution for thermal and pressure stresses (using different finite element software packages), to the calculation of CUF (both with and without EAF effects). Observations regarding differences in results and the reasons for those differences are identified and discussed. Recommendations for eliminating these differences are also made.

A Proposal to Consider Cycle Counting Methods for Fatigue Analysis of Nuclear and Conventional Power Plant Components

2016 ◽  
Author(s):  
Felippe M. S. Costa ◽  
José Luiz F. Freire ◽  
Jürgen Rudolph ◽  
José Eduardo Maneschy
Keyword(s):  
Finite Element ◽  
Analytical Solution ◽  
Time History ◽  
Peak Stress ◽  
Fatigue Analysis ◽  
Transient Temperature ◽  
Stress Range ◽  
Structural Components ◽  
Finite Element Software ◽  
Asme Code

This paper points out some relevant aspects of the simplified elasto-plastic fatigue analysis as addressed in the ASME Code Section III Subsection NB and its application to two structural components that are subjected to a slow or to a fast thermal transient. The structural components considered are a thick-walled pipe and a nozzle-to-vessel junction. For the case of the thick-walled pipe, a closed form analytical solution proposed by Albrecht for pipes subjected transient temperature loading was implemented and its results were compared to coupled thermal and mechanical finite element analyses using a commercial finite element software. The application of the analytical solution allows for an optimization of the time consumed to obtain the stresses that occur across the thickness of the pipe as a function of time, i.e. the membrane plus bending plus peak stress range, Sp. The analytical solution equally allows for the linearization of the stress components actuating along the pipe thickness for all time steps considered within the thermal stress solution. This yields the membrane plus bending stress range, Sn, and allows for a design code conforming plasticity correction by means of Ke factors. In the considered case of the nozzle-to-vessel junction, a finite element solution was used. It was one aim of the study to point out, that under fast transients loading situations the relevant stresses Sp and Sn do not necessarily coincide with each other. In the ASME Code the alternating stress Sa is a function of the factor Ke and of the range of Sp, with Ke being a function of the range of Sn and of the material properties. Consequently, a non-conservative fatigue analysis may result in the case of performing cycle counting only based on the time history of the critical Sp values and simply assigning the corresponding Sn and Ke values. This paper exemplifies one of those cases and proposes a method to overcome this problem.

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