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2010 December Issue
Full Table of Contents
Maintenance & Reliability Technologies
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About the Cover
A maintenance field service technician at Dreisilker’s Glen Ellyn, Ill. training shop takes voltage readings for electrical signature analysis using his All-Test Pro On-Line unit. Semi-annual inspections of electrical circuit panels must be performed by certified reliability personnel wearing proper safety protection equipment including flash-arc shield helmet, fire-resistant electricians gloves and fire-resistant clothing. Dreisilker Electric Motors Inc. has supplied motors, controls and reliability services to steel manufacturing plants and other industries for 55 years.
Photo courtesy of Dreisilker Electric Motors Inc.
Full magazine available in the Members Only Area |
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Technical Features Table of Contents |
| 40 |
Electric Arc Furnace Tap Changers — A Multifaceted Approach to Improving the Reliability and Performance of EAF On-Load Tap Changers
Chris Birkbeck (left), Carl Schwabe (center), furnace area electrical engineer, and Steve Ryan (right), raw materials supervisor, Nucor Steel–Indiana, Crawfordsville, Ind. (chris.birkbeck@nucor.com, carl.schwabe@nucor.com, steve.ryan@nucor.com)
Many EAF transformer on-load tap changers are prone to frequent failures. This paper discusses how Nucor Steel–Indiana achieved dramatic improvements in tap changer reliability, as well as improved energy and furnace power input.
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| 47 |
Synchronous and Induction Motors for Main Drive Applications
Ronald Tessendorf, senior engineer, TM GE Automation Systems LLC, Salem, Va. (ronald.tessendorf@tmeic-ge.com)
This paper deals with AC motors rated in the thousands of kilowatts, applied in high-performance applications, and operating over both constant torque and constant kilowatt speed ranges. Insight is provided into the process of selecting synchronous or induction designs for particular ratings and applications.
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57 |
Chemical Removal of Internal Scale From HCl Pickle Liquor Pipeline
Mark A. Nicholls (left), Global Research and Development, and Justin Wong (right), Utilities, ArcelorMittal Dofasco Inc., Hamilton, Ont., Canada (mark.nicholls@arcelormittal.com, justin.wong@arcelormittal.com)
Several attempts to mechanically clear scale buildup from the inner diameter of a waste pickle liquor delivery pipeline were unsuccessful. This paper describes the development and optimization of a chemical treatment process that effectively dissolved the scale from the pipe. |
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66 |
Novel Polyalkylene
Glycol-Based Hydraulic Fluids
Govind Khemchandani (left), senior technical specialist — PAG fluids and lubricants, The Dow Chemical Co., Freeport, Texas (gvkhemchandani@dow.com), and Martin Greaves (right), research leader — R & D, Dow Europe GmbH, Horgen, Switzerland (mrgreaves@dow.com)
Polyalkylene glycol-based fluid has been evaluated in several field trials in demanding hydraulic equipment. Lab test data and field performance of this novel hydraulic fluid are discussed, showing improvements in equipment efficiency, reliability and cleanliness.
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73 |
Caster Nozzle Protection
Marcus N. Allhands, vice president of business development, Orival Inc., Englewood, N.J. (ma@orival.com)
A four-month pilot study was conducted to determine a proper filtration system to minimize maintenance and maximize nozzle life. The study resulted in the design of an efficient and economical full-scale filtration system.
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78 |
New Developments in Drivetrains for Roughing and Plate Mills
Christoph Sundermann (left), general manager — drives/drive components, Eckehard Jung (center), senior project manager — drives/drive components sales and service, and Ralf Gehle, manager — drives/components design, SMS Siemag AG, Hilchenbach-Dahlbruch, Germany (christoph.sundermann@sms-siemag.com, eckehard.jung@sms-siemag.com, ralf.gehle@sms-siemag.com); and William Malan (right), general manager — drives/drive components sales and service, North American market, SMS Millcraft LLC, Park City, Utah (bill.malan@sms-millcraft.us, wm2260@juno.com)
Most spindle technology available today is not able to withstand the increased rolling torque for the production of high-strength materials. The latest slipper-type spindles from SMS Siemag are capable of absorbing up to 30% higher torques.
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Association for Iron & Steel Technology
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