Weight Savings Using ASME Section VIII, Division 2, Design-by-Analysis Methods

2009 ◽  
Author(s):  
Kanhaiya L. Bardia ◽  
Donald G. LaBounty ◽  
Michael M. Basic ◽  
Timothy D. Breig
Keyword(s):  
Analytical Methods ◽  
Analysis Method ◽  
Analysis Methods ◽  
Section Viii ◽  
Division 2 ◽  
Stress Criteria ◽  
Main Factor

The 2007 ASME Section VIII, Division 2, Part 5 Design-By-Analysis provides requirements for vessels and components using analytical methods. The authors have spent a considerable amount of time in studying and applying the requirements of the design by analysis methods in Part 5. As a result of this process, the authors have concluded that the main factor for weight savings is the stress criteria used to calculate the thickness by the design-by-analysis method. An example is provided to demonstrate the methods presented.

A Comparison of Different Design Codes on Fatigue Life Assessment Methods

2016 ◽  
Author(s):  
Jinhua Shi ◽  
Liwu Wei ◽  
Claude Faidy ◽  
Andrew Wasylyk ◽  
Nawal Prinja
Keyword(s):  
Pressure Vessel ◽  
Task Force ◽  
Fatigue Analysis ◽  
Life Assessment ◽  
Design Codes ◽  
Fatigue Life Assessment ◽  
Analysis Methods ◽  
Section Viii ◽  
Division 2 ◽  
Nuclear Association

Different pressure vessel and piping design codes and standards have adopted different fatigue analysis methods. In order to make some contribution to current efforts to harmonize international design codes and standards, a review of fatigue analysis methods for a number of selected nuclear and non-nuclear design codes and standards has been carried out. The selected design codes and standards are ASME Boiler and Pressure Vessel Code Section III Subsection NB and Section VIII Division 2, EN 12952, EN 13445, EN 13480, PD 5500, RCC-M, RCC-MRx, JSME, PNAEG and R5. This paper presents the initial review results. The results of the study could be used as part of the on-going work of the Codes and Standards Task Force of the World Nuclear Association (WNA) Cooperation in Reactor Design Evaluation and Licensing (CORDEL) Working Group.

Comparison of Design by Analysis Methods

2006 ◽  
Author(s):  
Sebastian Schindler
Keyword(s):  
Cross Section ◽  
Rectangular Cross Section ◽  
Pressure Vessels ◽  
Element Analysis ◽  
Advantages And Disadvantages ◽  
Direct Route ◽  
Analysis Methods ◽  
Air Cooler ◽  
Section Viii ◽  
Division 2

The paper discusses the advantages and disadvantages of the two well known Design by Analysis methods for unfired pressure vessels: the stress categorisation method (as given e.g. in the 2004 ASME B&BV Code Section VIII Division 2 [1], and EN 13445-3 Annex C [2]) and the new Direct Route (using elastic-plastic finite-element analysis) as given in EN 13445-3 Annex B [2]. A comparison of results is given for examples of various degree of difficulty to show the principal ideas and the applicability of the two approaches: a dished end with a nozzle in the knuckle region, a cylindrical shell to flat end connection and a rather complex header of an air cooler with rectangular cross section. As shown by the considered examples, the Direct Route method gives unique solutions (which is not always the case for stress categorisation) and can be advantageous in some cases, but requires a more time consuming analysis. The questionable design limits given by the 3f-criterion of the stress categorisation method can be avoided by usage of the progressive plastic deformation design check of the Direct Route if the required number of action cycles is low.

Analytical and Numerical Evaluation of the Cyclic Yield Area Criteria for Shakedown Requirements

2002 ◽  
Author(s):  
Isoharu Nishiguchi ◽  
Asao Okamoto ◽  
Norimichi Yamashita ◽  
Mitsuru Aoki
Keyword(s):  
Pressure Vessel ◽  
Numerical Evaluation ◽  
Failure Modes ◽  
Three Dimensional ◽  
Fem Analysis ◽  
Stress Evaluation ◽  
Division 1 ◽  
Section Viii ◽  
Division 2 ◽  
Stress Criteria

The rules in codes such as the ASME Boiler and Pressure Vessel Code Section III Division 1 and Section VIII Division 2, provide the concept of stress categorization to prevent inelastic failure modes based on the elastic analyses. The categorization of the stresses obtained by the FEM analysis, however, is not always clear and the Three Dimensional FEM Stress Evaluation in JPVRC (TDF committee) has been developed alternative criteria to dispense with the stress categorization. As for the evaluation of the primary plus secondary stress, criteria based on the concept of the Cyclic Yield Area (CYA) have been developed. In this paper, the recent results obtained in the committee are summarized to evaluate the validity and the usability of the criteria.

Assessment of Weep Holes in Cylindrical Shell Based on Elastic-Plastic Stress Analysis Method

2014 ◽  
Author(s):  
Dipak K. Chandiramani ◽  
Suresh K. Nawandar
Keyword(s):  
Carbon Steel ◽  
Stress Analysis ◽  
High Pressures ◽  
Material Selection ◽  
Analysis Method ◽  
Elastic Plastic ◽  
Section Viii ◽  
Vessel Walls ◽  
Division 2 ◽  
Plastic Stress

In urea plant equipment, particularly those operating in the synthesis cycle, anti-corrosive liner plates are usually applied to the pressure retaining carbon steel vessel walls. Even with the correct material selection, controlled fabrication methods and maintenance, the risk of highly corrosive urea-carbamate solution leaking through these liners always exists in these equipment which might eventually damage the carbon steel walls. Existing designs of these equipment utilizes “weep holes” to reveal such leakages. Various designs exist, but in general these weep holes are 15–20mm dia. plain openings in the vessel walls connecting the space between the liner and the vessel wall to the outside atmosphere or the leak-detect apparatus. These equipment operate at high pressures and temperatures and therefore ASME Section VIII Division 2 is normally the preferred design and construction Code. This Code, earlier to the publication of its Edition 2007, had provisions in it to exempt openings not exceeding certain diameters, from any reinforcement calculations. Traditionally, equipment designers have been applying this clause to seek the exemption of these weep holes from any further calculations. However, starting with Edition 2007, this Code did away with such exemptions and has made it mandatory to assess openings of all sizes, particularly if they are in the monobloc vessels. Weep holes are no exception. This paper discusses how the assessment of these weep holes in cylindrical shells can be carried out by applying the “Elastic-Plastic Stress Analysis Method” stipulated in Para. 5.2.4 & 5.3.3 of the ASME Section VIII Division 2 Code. This paper also provides the basis for recommending this method. In the application of this method, the subject is approached as a “shell with opening” and not as conventional “nozzle opening in the shell”.

Review on Mechanism and Analysis Methods of Low Frequency Oscillation in Power System

2014 ◽  
Vol 986-987 ◽  
pp. 2010-2013
Author(s):  
He Nan Wang ◽  
Chao Zheng ◽  
Jie Ren ◽  
Jian She Tian ◽  
Hong Tao Liu ◽  
...  
Keyword(s):  
Power System ◽  
Low Frequency ◽  
Generation Mechanism ◽  
Analysis Method ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Advantages And Disadvantages ◽  
Analysis Methods ◽  
System Interconnection ◽  
Main Factor

Low frequency oscillation caused by system interconnection has been the main factor to threat the secure operation of power grid. It’s significant to research on the problem of low frequency oscillation. This paper summarizes the generation mechanism and analysis methods of low frequency oscillation. Each analysis method has both advantages and disadvantages.

Limit Pressures of Cylindrical and Spherical Shells

2000 ◽  
Vol 123 (3) ◽  
pp. 288-292 ◽  
Author(s):  
Arturs Kalnins ◽  
Dean P. Updike
Keyword(s):  
Geometric Parameter ◽  
Cylindrical Shells ◽  
Length Effect ◽  
Spherical Shells ◽  
Simply Supported ◽  
Limit Pressure ◽  
Section Viii ◽  
Division 2

Tresca limit pressures for long cylindrical shells and complete spherical shells subjected to arbitrary pressure, and several approximations to the exact limit pressures for limited pressure ranges, are derived. The results are compared with those in Section III-Subsection NB and in Section VIII-Division 2 of the ASME B&PV Code. It is found that in Section VIII-Division 2 the formulas agree with the derived limit pressures and their approximations, but that in Section III-Subsection NB the formula for spherical shells is different from the derived approximation to the limit pressure. The length effect on the limit pressure is investigated for cylindrical shells with simply supported ends. A geometric parameter that expresses the length effect is determined. A formula and its limit of validity are derived for an assessment of the length effect on the limit pressures.

scholarly journals MUSLIM AWARENESS IN SCIENCE OF FARAIDH SYSTEMS

2019 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Khifni Kafa Rufaida
Keyword(s):  
Data Collection ◽  
Qualitative Analysis ◽  
Analytical Methods ◽  
Field Research ◽  
Public Knowledge ◽  
Analysis Method ◽  
Inheritance Law ◽  
Muslim Society ◽  
Inheritance System ◽  
The World

Islamic Inheritance Law basically applies to all Muslims in the world. But in fact, a true Muslim society must obey Mawaris jurisprudence is actually more leave even forget this science. Because it is no longer a concern for Muslims, finally arose some disputes between families which is really due to the neglect of science faraidh which has been arranged by God for the benefit of his people. It is important for the writer to contribute how to build awareness of the existence of Muslim faraidh science in the division of inheritance system. In this study, the method used to address the problem is normative. Methods of data collection in this research is done by: Library Researchand Field Research. The analytical methods used this research is qualitative analysis method. Awareness of the importance of the science of inheritance can be grown in a way memperlajari faraidh science. By studying faraidh will automatically raise awareness faraidh to apply science in the division of the inheritance. The author argues that this faraidh science should be included in a curriculum in Madrasah Diniyyah. The principle of peace is a justifiable manner, so that the atmosphere can be established brotherhood. Throughout the peace was not meant to proscribe lawful or justify the unlawful, then it is allowed. The author thinks that the lack of public knowledge about the law faraidh a major cause of the low awareness of the use of science in the division of islamic inheritance/faraidh.

Log-Logistic Analysis of Herbicide Dose-Response Relationships

1995 ◽  
Vol 9 (2) ◽  
pp. 218-227 ◽  
Author(s):  
Steven S. Seefeldt ◽  
Jens Erik Jensen ◽  
E. Patrick Fuerst
Keyword(s):  
Dose Response ◽  
Logistic Model ◽  
Response Analysis ◽  
Analysis Method ◽  
Weed Science ◽  
Response Curves ◽  
Herbicide Resistant ◽  
Logistic Analysis ◽  
Analysis Methods ◽  
The Difference

Dose-response studies are an important tool in weed science. The use of such studies has become especially prevalent following the widespread development of herbicide resistant weeds. In the past, analyses of dose-response studies have utilized various types of transformations and equations which can be validated with several statistical techniques. Most dose-response analysis methods 1) do not accurately describe data at the extremes of doses and 2) do not provide a proper statistical test for the difference(s) between two or more dose-response curves. Consequently, results of dose-response studies are analyzed and reported in a great variety of ways, and comparison of results among various researchers is not possible. The objective of this paper is to review the principles involved in dose-response research and explain the log-logistic analysis of herbicide dose-response relationships. In this paper the log-logistic model is illustrated using a nonlinear computer analysis of experimental data. The log-logistic model is an appropriate method for analyzing most dose-response studies. This model has been used widely and successfully in weed science for many years in Europe. The log-logistic model possesses several clear advantages over other analysis methods and the authors suggest that it should be widely adopted as a standard herbicide dose-response analysis method.

Pengaruh penanaman modal dalam Negeri, penanaman modal asing dan ekspor terhadap PDRB Provinsi Jambi Periode 2000- 2016

2020 ◽  
Vol 8 (3) ◽  
pp. 155-164
Author(s):  
Tarmizi Tarmizi ◽  
Siti Hodijah ◽  
Rosmeli Rosmeli
Keyword(s):  
Quantitative Analysis ◽  
Foreign Investment ◽  
Descriptive Analysis ◽  
Domestic Investment ◽  
Analysis Method ◽  
Analysis Methods ◽  
Study Results ◽  
Investment Growth

This study aims to analyze the development of GRDP, domestic investment, foreign investment, and exports in Jambi Province for the period 2000-2016, as well as to study the effect of domestic investment, foreign investment, and exports on the growth of GRDP of Jambi Province in the period 2000-2016. 2016. This research uses descriptive and quantitative analysis methods. The descriptive analysis method is used to analyze the development of each research variable, namely domestic investment, foreign investment, and exports. Quantitative analysis methods are used to analyze the effect of domestic investment, foreign investment, and exports on the growth of GRDP in Jambi province for the period 2000-2016. Based on the study results, the Jambi Province GRDP growth for the 2000-2016 period was 7.21 percent, domestic investment growth was 11.64 percent, foreign investment was 18.69 percent, and export development was 17.83 percent. And during the period 2000-2016, domestic investment, foreign investment, and exports had a significant effect on GRDP growth in Jambi Province. Keywords: Domestic investment, Foreign investment, Exports, PDRB Growth

Applicability of Design Rules for Openings in Shells, ASME B&PV Code, Section VIII, Division 2 - A Case Study

2021 ◽  
Author(s):  
Gurumurthy Kagita ◽  
Krishnakant V. Pudipeddi ◽  
Subramanyam V. R. Sripada
Keyword(s):  
Stress Analysis ◽  
Failure Modes ◽  
Element Analysis ◽  
Design Rules ◽  
Area Method ◽  
Replacement Method ◽  
Local Stresses ◽  
Pressure Area ◽  
Section Viii ◽  
Division 2

Abstract The Pressure-Area method is recently introduced in the ASME Boiler and Pressure Vessel (B&PV) Code, Section VIII, Division 2 to reduce the excessive conservatism of the traditional area-replacement method. The Pressure-Area method is based on ensuring that the resistive internal force provided by the material is greater than or equal to the reactive load from the applied internal pressure. A comparative study is undertaken to study the applicability of design rules for certain nozzles in shells using finite element analysis (FEA). From the results of linear elastic FEA, it is found that in some cases the local stresses at the nozzle to shell junctions exceed the allowable stress limits even though the code requirements of Pressure-Area method are met. It is also found that there is reduction in local stresses when the requirement of nozzle to shell thickness ratio is maintained as per EN 13445 Part 3. The study also suggests that the reinforcement of nozzles satisfy the requirements of elastic-plastic stress analysis procedures even though it fails to satisfy the requirements of elastic stress analysis procedures. However, the reinforcement should be chosen judiciously to reduce the local stresses at the nozzle to shell junction and to satisfy other governing failure modes such as fatigue.

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