Your browser is currently set to block JavaScript.

For full functionality of this site it is necessary to enable JavaScript. Here are the instructions how to enable JavaScript in your web browser.

After enabling javascript, please refresh the page to go back to experts.com site with full functionality

Would you turn off/on JavaScript?

It's a widely used language that makes the web what it is today, allowing for websites to be more responsive, dynamic, and interactive. Disabling JavaScript takes websites back to a time when they were simple documents without any other features.

What are the advantages of using JavaScript?

Speed. Since JavaScript is an 'interpreted' language, it reduces the time required by other programming languages like Java for compilation. JavaScript is also a client-side script, speeding up the execution of the program as it saves the time required to connect to the server.

banner ad
Experts Logo

articles

Case Study: Coke Oven Battery Analysis

By: Bill O'Donnell
Tel: 412-835-5007
Email Mr. O'Donnell


View Profile on Experts.com.


A comprehensive engineering analysis was performed on a coke oven battery roof and heating walls. Coke oven batteries are constructed with refractory bricks. To accommodate thermal expansion that occurs in the bricks when they are heated from ambient temperature, expansion joints are used. These expansion joints are then sealed with grout after most of the thermal expansion has occurred. Premature grouting of the roof was a major consideration in evaluating the structural integrity and projected life expectancy of the battery.

In litigation, it was alleged that longitudinal expansion of the roof due to the timing of the grouting had caused the top of the heating walls to move away from their straight vertical positions, inducing excessive stresses in the heating walls, thus limiting the structural integrity of the battery. O'Donnell Consulting (OCE) was tasked to perform a comprehensive engineering analysis of the grouting sequence and to evaluate the structural life of the battery. OCE made extensive use of finite element engineering analysis to calculate temperatures, deflections, strains, and stresses using time-dependent creep analysis methods to evaluate the long term integrity of the roof and heating walls.

Image

When in operation, coke oven batteries normally undergo time-dependent deformations, and creep, due to static and cyclic thermo-mechanical loads. Using finite element analysis methods, evaluations were carried out for a 25-year operating life.

Image

Conservative values for the material properties, allowable stresses, and modeling details were used when performing these evaluations. Material property tests were performed on brick-only and brick-mortar specimens obtained from the original battery production lots. Data from the tests, which were performed at a range from temperatures from ambient to 2200 oF, were used to generate values for allowable design stresses.

OCE performed finite element structural analyses of the battery using the allowable design stresses and refractory material properties. Three dimensional, non-linear models were developed to quantify the stability of the heating walls and evaluate the wall stresses. These models were subjected to cyclic pressure and thermal loading conditions, due to charging. The effects of operating conditions on the as-built battery with construction imperfections were evaluated to determine the battery displacements and stresses vs. time. The finite element results showed that the battery oven walls would not deflect enough to induce instability. The construction imperfections had no meaningful effect on the structural integrity, robustness, or longevity of the battery. Such studies are quite useful in planning battery maintenance efforts.


O'Donnell Consulting Engineers, Inc. (OCE) provides engineering, failure analysis, metallurgy, and expert witness services. Providing analytical, design, testing, and technical problem solving services for more than 30 years, our extensive experience gives us credibility in expert witness testimony. Our results are based on quantified engineering principles and analysis- not just opinions. We have testified in International, Federal, and State Courts, presenting comprehensive technical reports, models, and simulations that are easily understood by Judges and Juries.

©Copyright - All Rights Reserved

DO NOT REPRODUCE WITHOUT WRITTEN PERMISSION BY AUTHOR.

Related articles

ewen-todd-photo1.jpg

8/26/2014· Engineering

Outbreaks Where Food Workers Have Been Implicated in the Spread of Foodborne Disease. Part 10. Alcohol-Based Antiseptics for Hand Disinfection and a Comparison of Their Effectiveness with Soaps

By: Dr. Ewen Todd

Alcohol compounds are increasingly used as a substitute for hand washing in health care environments and some public places because these compounds are easy to use and do not require water or hand drying materials. However, the effectiveness of these compounds depends on how much soil (bioburden) is present on the hands. Workers in health care environments and other public places must wash their hands before using antiseptics and/or wearing gloves. However, alcohol-based antiseptics, also called rubs and sanitizers, can be very effective for rapidly destroying some pathogens by the action of the aqueous alcohol solution without the need for water or drying with towels.

Vincent-Ettari-Design-Engineer-Expert-Photo.jpg

3/23/2009· Engineering

Are you contemplating subdividing a land parcel? What you should know about the design and installation of water mains.

By: Vincent A. Ettari, PE

In many places of NYS, public water supply systems are available. If your site is situated in such a location, then the lots which will result from your contemplated subdivision will be required to draw their water supply from the municipal water system

John-Hoschette-photo.jpg

10/31/2011· Engineering

Engineering: Asking For a Raise is Easier Than You Think, Even In Bad Times

By: John Hoschette

Do you feel underpaid and deserving of a higher salary? Are you thinking about asking for a raise, but unsure how to go about it? Do you cringe at the thought of approaching your boss?

;
Experts.com-No broker Movie Ad

Follow us

linkedin logo youtube logo rss feed logo
;