The Weight Reduction Design of the Regenerator CA Nozzle in FCC Unit Using the FEA

2013 ◽  
Vol 658 ◽  
pp. 345-349
Author(s):  
Il Taek Lee ◽  
Hyun Sik Kim ◽  
Namr Young Choi ◽  
Dong Pyo Hong
Keyword(s):  
Weight Reduction ◽  
Catalytic Cracking ◽  
Equivalent Stress ◽  
High Stress ◽  
Fluid Catalytic Cracking ◽  
Code Design ◽  
Element Analysis ◽  
High Stress Concentration ◽  
Unit Energy ◽  
Asme Code

Recently, due to the rising of oil prices, interest in FCC Unit (Fluid Catalytic Cracking Unit) energy recycling is increasing. FCC Unit (Fluid Catalytic Cracking Unit) is a mechanical used to convert bunker C oil into high quality gasoline. Pressure vessel of FCC Unit is that refining the crude oil when is operating in high-temperature and high-pressure environment. So it needs analysis of structure carefully. In this paper, FEA (Finite element analysis) of the FCC unit was performed to evaluate its structural stability and weight reduction. The equivalent stress of the FCC unit was investigated and compared against the ASME code design specifications. The area of high stress concentration with maximum stress higher than the prescribed value was analyzed locally to carefully evaluate the stress. Finally, we were reduces the thickness of the CA nozzle in FCC unit, and it was satisfied structural stress.

Structural Design of Regenerator CA Nozzle in FCC Unit

2013 ◽  
Vol 702 ◽  
pp. 280-285
Author(s):  
Hyun Sik Kim ◽  
Il Taek Lee ◽  
Sung Mo Yang ◽  
Dong Pyo Hong
Keyword(s):  
Equivalent Stress ◽  
High Stress ◽  
Code Design ◽  
Element Analysis ◽  
Analysis And Design ◽  
High Stress Concentration ◽  
Refining Operation ◽  
Asme Code ◽  
Design Requirements ◽  
Operation Pressure

FCC Unit (Fluid Catalytic Cracking Unit) is a mechanical device used to convert bunker C oil into high quality gasoline. During the refining operation, pressure vessel of FCC unit operates in high-temperature and high-pressure environment. Careful structural analysis and design are necessary for such equipment.In this paper, FEA (Finite element analysis) of the FCC unit was performed to evaluate its structural stability. The equivalent stress of the FCC unit was investigated and compared against the ASME code design specifications.The area of high stress concentration with maximum stress higher than the prescribed value was analyzed locally to carefully evaluate the stress.CA nozzle in the FCC unit was found to have significant margins for factor of safety and was redesigned for weight reduction. Tensile test was carried out to verify the integrity of the welded parts. Tensile strength of the welded partssatisfies all design requirements.

Finite Element Analysis of Residual Stresses in Threaded End Closures

1991 ◽  
Vol 113 (3) ◽  
pp. 398-401 ◽  
Author(s):  
A. Chaaban ◽  
U. Muzzo
Keyword(s):  
Finite Element ◽  
Residual Stresses ◽  
Bauschinger Effect ◽  
High Stress ◽  
Empirical Method ◽  
Pressure Vessels ◽  
Element Analysis ◽  
High Stress Concentration ◽  
Proof Testing ◽  
Pressure Cycle

Due to the high stress concentration at the root of the first active thread in threaded end closures of high pressure vessels, yielding may occur in this region during the application of the first pressure cycle or proof testing. This overstraining introduces residual stresses that influence the fatigue performance of the vessel. This paper presents a parametric analysis of threaded end closures using elastic and elasto-plastic finite element solutions. The results are used to discuss the influence of these residuals on the estimated fatigue life when the vessel is subjected to repeated internal pressure. A simple empirical method to allow for the Bauschinger effect of the material is also proposed.

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.

Development of Design Curve for Sweepolet Subjected to Acoustic Induced Vibration

2016 ◽  
Author(s):  
Yuqing Liu ◽  
Philip Diwakar ◽  
Dan Lin ◽  
Ismat Eljaouhari ◽  
Ajay Prakash
Keyword(s):  
Fatigue Life ◽  
Stress Concentration ◽  
Fatigue Failure ◽  
High Stress ◽  
Peak Stress ◽  
Acoustic Energy ◽  
Piping System ◽  
Element Analysis ◽  
Design Curve ◽  
High Stress Concentration

High acoustic energy has the potential to cause severe Acoustic Induced Vibration (AIV) that leads to fatigue failure at high stress concentration regions such as fittings in a piping system. Sweepolet fittings have been extensively used as mitigation to counteract the risk of fatigue failure caused by AIV. The advantages of a sweepolet are its integrally reinforced contoured body and low stress concentration. However, there are inconsistencies in published standards and regarding the design limits for sweepolet subjected to AIV. In this paper, Finite Element Analysis is conducted to simulate high frequency pipe shell wall vibration caused by acoustic energy inside the pipe. Peak stress and the associated minimum fatigue life are calculated for sweepolet and sockolet under the same acoustic excitation. By comparing the stress level to that of a sockolet whose design limit to AIV had been published, the design curve and fatigue life equation for sweepolet are developed.

Acoustic Vibration Induced Fatigue in Pipe Joints

2015 ◽  
Author(s):  
Ajay Prakash ◽  
Philip Diwakar ◽  
Dan Lin ◽  
Paul Deane ◽  
Yuqing Liu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Sound Pressure ◽  
High Stress ◽  
Acoustic Vibration ◽  
Acoustic Energy ◽  
Piping System ◽  
Element Analysis ◽  
High Stress Concentration ◽  
Pipe Joints

High acoustic energy has the potential to cause severe acoustic induced vibration (AIV) that can lead to fatigue failure at high stress concentration locations (discontinuities) in a piping system. AIV at pipe junctions (Lateral, Tee, and Wye) and welded support attachments (trunnions and shoes) is evaluated using Finite Element Analysis. At different size pipe junctions, branch and header pipe shells may be subjected to different sound pressure. Also, inertia associated with different wall thickness(s) can lead to very different dynamic response of the two shell walls. The effect of these differences on AIV response is analyzed. Resulting response for different junction reinforcement designs is evaluated and compared to an unreinforced ‘stub-on’ configuration to assess the designs.

Failure Analysis of Full Delamination on the Stacked Die Leaded Packages

2003 ◽  
Vol 125 (3) ◽  
pp. 392-399 ◽  
Author(s):  
T. Y. Lin ◽  
Z. P. Xiong ◽  
Y. F. Yao ◽  
Lane Tok ◽  
Z. Y. Yu ◽  
...  
Keyword(s):  
Finite Element ◽  
Adhesion Strength ◽  
High Stress ◽  
Consumer Products ◽  
Lead Frame ◽  
Element Analysis ◽  
Factors Affecting ◽  
Temperature Cycles ◽  
High Stress Concentration ◽  
Die Attach

There has been significant demand for stacked die technology during the past few years. The stacked die devices are mainly used in portable consumer products. This kind of silicon integration technology provides flexibility in space reduction, weight savings, and excellent electrical functionality. In this article, the stacked die construction was built into the leaded package. It was found that the test vehicles had full delamination at the lead-frame paddle/mold compound interface after 100 temperature cycles (−65°C to 150°C) with moisture preconditioning at level 3 (60°C at 60% relative humidity for 40 h) although the electrical test passed 1000 temperature cycles. The fishbone diagram was used to identify the possible failure root causes. The material, process, and design factors were extensively evaluated by the experiments and finite element analysis. The evaluation results showed that die attach paste voids were major factors affecting the package integrity and could produce the delamination initiation at the edge of the die attach paste and propagate down to the lead-frame paddle/mold compound interface due to high stress concentration and weak adhesion strength. The finite element analyses were implemented to address the stress distribution in the stacked die package and verified by the scanning acoustic microscope. It demonstrated that excellent package integrity could be obtained by applying the void-free die attach paste and improving the adhesion strength at the lead-frame paddle level.

scholarly journals DESIGN OPTIMIZATION FOR WEIGHT REDUCTION OF LOCOMOTIVE WHEEL USING RESPONSE SURFACE METHODOLOGY

2020 ◽  
Vol 6 (1) ◽  
pp. 39-46
Author(s):  
Harmesh Lal ◽  
Balkar Singh
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Response Surface Methodology ◽  
Design Optimization ◽  
Response Surface ◽  
Weight Reduction ◽  
Equivalent Stress ◽  
Manufacturing Cost ◽  
Element Analysis ◽  
Structural Loading

Manufacturing cost of locomotive wheel largely depends on mass of locomotive wheel and to reduce mass of wheel, design optimization is necessary. In this research the design of locomotive wheel is optimized considering hub radius and hub width as input parameters to DOE (Design of Experiments). Initially finite element analysis is performed under static structural loading conditions to determine equivalent stress and safety factor which is followed by design optimization using Response Surface Methodology. The software used for design and analysis is ANSYS.

Analytical and Finite Element Solution of Tractor Brake Link to Achieve Weight and Cost Reduction

2019 ◽  
Vol 895 ◽  
pp. 307-312
Author(s):  
Anantha G.L. Krishna ◽  
K.M. Sathish Kumar
Keyword(s):  
Finite Element ◽  
Weight Reduction ◽  
High Stress ◽  
Cost Savings ◽  
Element Analysis ◽  
Rotating Discs ◽  
Stress Zone ◽  
Steel Balls ◽  
The Cost ◽  
High Stress Zone

In tractor brakes, when the brake is applied, tension in the operating rod causes the links to turn the two actuating disc slightly, in opposite directions. The shape of the recesses in which the hardened steel balls locate is such that, as disc move relative to each other, the ball force them apart and apply pressure to the rotating discs. The automotive industry has for many years identified weight reduction as a way of improving product competitiveness and thus the ability to make profits. In present work, an attempt has been made to reduce the thickness of link and hence achieve weight reduction and cost savings. The actuator link has been analyzed for stresses. The existing link is of 6 mm thickness and is made of C – 40 steel. The existing link of 6 mm thickness along with links of 5 mm and 4 mm thickness were considered for analysis. It is found that the stresses in 5 mm thick link are well within limits with a factor of safety of 2.3. This reduction in thickness would yield a reduction in weight of link and hence would reduce the cost of link with a saving potential of Rs.14, 40000/= per year considering the fact that 6, 00,000 tractors are sold in India every year. Experimental investigation showed the zone of failure of link is in line with the high stress zone indicated by finite element analysis.

Analysis and validation of femur bone data using finite element method under static load condition

2019 ◽  
Vol 233 (16) ◽  
pp. 5547-5555 ◽  
Author(s):  
S Mathukumar ◽  
VA Nagarajan ◽  
A Radhakrishnan
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Static Load ◽  
High Stress ◽  
Load Condition ◽  
Computational Method ◽  
Medical Attention ◽  
Element Analysis ◽  
High Stress Concentration ◽  
Femur Bone

Humans face bone fracture when they unfortunately met an accident, which requires timely medical attention for healing and repairing the fractured bone; otherwise that paralyzes their life. 3D modeling technique with computational method is very helpful at the side of doctors for healing and repairing the damaged bones. Fractional bone healing is one of the natural processes, which regain the mechanical reliability of the bone to a limited level of failures. The relationship between the biology and mechanics has introduced a new branch namely biomechanics. Various biomechanics models were used to identify the fracture for different patients and helps in the fracture treatment. The aim of this work is to find out the high stress concentration area of the femur bone, which has been extracted as image from computer tomography scanner. The retrieved noise-free femur bone image is tested by the static load condition with the help of the finite element analysis. The result obtained from the testing of different loads has been compared with the existing literature. It is found that the femur bone has tensile and compressive stress, and the neck area of the femur is at a very high stress concentration. The outcome of this work is much supportive to orthopedic surgeons in femur surgery and bone prosthesis by avoiding experiments on femur bone.

Vibration Analysis of a Large Pressure Vessel Using the FEA

2013 ◽  
Vol 336-338 ◽  
pp. 1387-1390
Author(s):  
Iltaek Lee ◽  
Chan Gon Park ◽  
Ho Jong Kim ◽  
Taeg Yun Jung ◽  
Dong Pyo Hong
Keyword(s):  
Natural Frequency ◽  
3D Modeling ◽  
Pressure Vessel ◽  
Catalytic Cracking ◽  
Critical Stress ◽  
Fluid Catalytic Cracking ◽  
Frequency Range ◽  
Unit Energy ◽  
Large Pressure ◽  
Method Analysis

According to the recent rise in oil prices, interest in FCC Unit (Fluid Catalytic Cracking Unit) energy recycling is increasing. Such FCC Unit is a facility which refining low-valued bunker C oil into high-valued gasoline. Pressure vessel that refines crude in FCC Unit needs various interpretation because it operates under high-temp and pressure. Our concern about this FCC Unit is increasing. Experiments about its safety is not enough. In this paper, whether FCC Unit has structural stability or not, we found out FEM(Finite Element Method) analysis after trying 3D modeling by using FCC Units condition of design and critical stress as a translating data. First, we researched the safety of structure applying external factors using the natural frequency. The structure is safe from modal analysis result, the first natural frequency is 13.614Hz , beyond the of the frequency range of the wind (0.001~8Hz) and earthquake (0.1~10Hz).

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