Articles Written by Thielsch Engineering Personnel:

Articles Written by Thielsch Engineering Personnel: Reinspection of Deaerator Welds is Key to Continued Safe Operation Reprinted from POWER, Vol. 134, No. 1, pp. 63-65, January 1990 Failures, Repairs, and Integrity of Pulp & Paper Mill Equipment Reprinted from AMERICAN PAPERMAKER, Vol. 53, pp. 35-37, May 1990 Casing Repair Adds Years of Service to Vintage Turbine Reprinted from POWER, Vol. 135, No. 1, pp. 55-56, January 1991 In-Service Creep Strain Measurements for Life Prediction and Extension of Piping and Boiler Components By Helmut Thielsch Reprinted from MATERIALS EVALUATION, Vol. 49, No. 2, pp. 123-129, February 1991 Accelerated Tube Metal Wastage in Municipal Solid Waste Fired Furnace By Helmut Thielsch Presented at NACE Annual Conference, March 1991, Cincinnati, Ohio Capacitive Creep Strain Measurements Predict Component Life By Helmut Thielsch, Nancy Knarr and Caroline Burdick Reprinted from POWER ENGINEERING, Vol. 95, pp. 24-27, May 1991 Engineering Analysis of Suitability for Pressure Vessel Re-Rating By Ara Nalbandian and Nancy Knarr Presented at TAPPI Conference, September 1991, Nashville, Tennessee Reformer Failures and Repairs Reprinted from FINDS, Vol. VI, No. 3, pp. 29-34, 3rd Quarter 1991 Recommended Practice for Prevention, Detection and Correction of Deaerator Cracking By Nancy Knarr Reprinted from TAPPI Journal, Vol. 74, No. 9, pp. 297-298, September 1991 Turbine Casing - Inspection Repair Considerations Extension of Remaining Life Presented at EPRI Conference, December 1988, San Antonio, Texas Considerations in the Evaluation of Graphitization in Piping Systems By Helmut Thielsch Reprinted from The Welding Journal, Vol. 34, Research Supplement, pp. 286S - 294S, June 1955 Cost Effective Evaluation of Our Roadway Bridges By Pamela Olsen Reprinted from Providence Engineering Society, ENGINEERINGS, Vol. LXVII, No. 8, April 1992

Fitness-for-Purpose Evaluation of a Deaerator with Cracking Reprinted from MATERIALS EVALUATION, Vol. 50, No. 5, pp. 561-564, May 1992 Critical Component Failures Associated with Pipe Supports - Causes and Prevention By William Thurley and Helmut Thielsch, Jr. Presented at ASME Pressure Vessels and Piping Conference, June 1992, New Orleans, Louisiana Operation and Maintenance of Instrumentation Systems By Edward R. Altiere Reprinted from Journal of the New England Water Works Association, Vol. 106, No. 2, pp. 109-111, June 1992 Corrosion Damage Assessment Utilizing Special Ultrasonic Techniques By Matt Dowling and Nancy Knarr Presented at TAPPI Conference, September 1992, Boston, Massachusetts; and Published by CSNDT Journal, Vol. 14, No. 4, pp. 12-14, July/August 1993 Failures, Integrity and Repairs of Petrochemical Plant Reformers Presented at AIChE Conference, September 1992, San Antonio, Texas; and Published in AMMONIA PLANT SAFETY (AIChE Technical Manual), Vol. 33, pp. 30-52, 1993 Utilization of Modern Nondestructive Testing Techniques on Plant Reliability Presented at First International Conference on Improving Reliability in Petrochemical Refineries, and Chemical and Natural Gas Plants, November 1992, Houston, Texas; and Published in two parts by MATERIALS EVALUATION, Vol. 52, No. 4, pp. 457-461, April 1994 and Vol. 52, No. 5, pp. 550-554, May 1994. Also printed in two parts by CSNDT Journal, Vol. 14, No. 3, pp. 10-20, May/June 1993 (Part 1), and Vol. 14, No. 4, pp. 18-24, July/August 1993 (Part 2) Pressure Part Protection Against High Temperature Corrosion By Nancy Knarr, Wayne Pratt and Brad Rogers Presented at NACE Annual Conference and Corrosion Show, March 1993, New Orleans, Louisiana Equipment Failures Reprinted from AMERICAN PAPERMAKER, Vol. 56, No. 3, pp. 44-47, March 1993, also Published in CSNDT Journal, Vol. 15, No. 1, pp. 10-12, January/February, 1994 Consider Repair Before Replacing Cracked Steam-Turbine Shells Reprinted from POWER, Vol. 137, No. 3, pp. 69-70, March 1993 Inspecting Urea Reactors and Associated Equipment Reprinted from FINDS, Vol. VIII, No. 2, pp. 32-35, 2nd Quarter 1993 Causes and Resolution of Through-Wall Cracking in a Cold Reheat Piping System Presented at ASME Pressure Vessel and Piping Conference, July 1993, Denver, Colorado and Published in the Conference Proceedings, PVP-Vol. 255, 1993, pp. 143-154

Boiler Waterwall Tube Evaluation to Identify Deterioration and Prevent Forced Outages Presented at ASME Pressure Vessel and Piping Conference, July 1993, Denver, Colorado and Published in the Conference Proceedings, PVP-Vol. 255, 1993, pp. 13-21 Increasing Plant Reliability by Nondestructive Examinations Reprinted from NITROGEN, No. 205, pp. 39-47, September - October 1993 How to Evaluate and Repair Hydraulic Presses and Cylinders Reprinted from FLUID POWER SERVICE CENTER, Vol. 2, No. 4, pp. 22-23, Summer 1993 Potential Failure Mechanisms in Composite Tubing Presented at the TAPPI Engineering Conference, September 1993, Orlando, Florida; and Published in the Engineering Conference Proceedings, Book 1, 1993, pp. 233-257 Failures and Failure Prevention in Process Piping Presented at the First International Symposium on Process Industry Piping, December 1993, Orlando, Florida; and Published in the Symposium Proceedings, pp.16/1-16/54, December, 1993. A shortened version entitled, "Service- Related Failures in Process Piping" was reprinted in MATERIALS PERFORMANCE, Vol. 34, pp. 53-56, August 1995 Remedies for Waste-to-Energy Plants' Most Vexing Operations and Maintenance Problem: Tube Failures Reprinted from SOLID WASTE TECHNOLOGIES, Vol. VIII, No. 1, pp. 32-39, January/February 1994 Equipment Integrity - Essential to Risk Management Presented at American Risk Protection Consultants 21st Annual Loss Control and Risk Management Conference, March 1994, Clearwater Beach, Florida Steam Chest Repairs By Caroline Burdick Presented at the EPRI International Conference on Welding and Repair Technology for Fossil Power Plants, March 1994, Williamsburg, Virginia Modifications to Tee Connections and Pipe Supports of the Main Steam Piping Systems Unit Nos. 1, 2, and 3, Wood River Generating Station, Illinois Power Company By Helmut J. Thielsch, Jr., James M. Yagen and Kenneth W. McCully Presented at the EPRI International Conference on Welding and Repair Technology for Fossil Power Plants, March 1994, Williamsburg, Virginia and published in the Conference Proceedings, Session 5, Piping, March 1994 Condition Assessment and Repair Welding of High Temperature Headers Presented at the EPRI International Conference on Welding and Repair Technology for Fossil Power Plants, March 1994, Williamsburg, Virginia and Published in the Conference Proceedings, Session 1, Headers and Pressure Vessels, March 1994

Failures and Failure Prevention of Paper Machine Components Presented at the TAPPI Engineering Conference, September 1994, San Francisco, California and Published in the Engineering Conference Proceedings, Book 1, 1994, pp. 31-83 Utility Repairs Damaged Generator Shaft, Avoids Replacement Reprinted from HYDRO REVIEW, Vol. XIII, No. 5, pp. 112-113, August 1994 Digester Safety - Failures, Failure Prevention and Repairs of Batch and Continuous Digesters Reprinted from AMERICAN PAPERMAKER, Vol. 57, No. 9, pp. 54-57, September 1994 Failures in Waste Heat Boilers By Helmut Thielsch, Florence Cone and Jonathan Freeman Presented at the AIChE Ammonia Safety Symposium, October 1994, Vancouver, BC, Canada; and Published in AMMONIA PLANT SAFETY (AIChE Technical Manual), Vol. 35, pp. 81-108, 1995 Corrosion in Recovery and Refuse-Fired Boilers Presented at the International Joint Power Generation Conference, October 1994, Phoenix, Arizona Equipment Integrity Inspections - Essential to Risk Management Presented at the Third International Conference on Improving Reliability in Petroleum Refineries and Chemical Plants, November 1994, Houston, Texas Digester Inspections for Safety and Integrity Reprinted from PAPER INDUSTRY, Vol. 11. No. 6, November/December 1994, pp. 12, 26-27 Failures and Repairs of Turbine Casings Presented at the 57th American Power Conference, April 1995, Chicago, Illinois; and Published in the Conference Proceedings, Volume 57-III, 1995, pp. 1917-1948 Failures and Repairs of Headers and Drums in Fossil Fired Boilers Presented at the 1995 Joint ASME/JSME Pressure Vessels and Piping Conference, July 1995, Honolulu, Hawaii; and Published in the Conference Proceedings, "Service Experience, Structural Integrity, Severe Accidents, and Erosion in Nuclear and Fossil Plants", PVP-Vol. 303, 1995, pp. 323-375 Catastrophic Failure of Cast Iron Dryer Roll Caused by Severe Erosion Resulting from Spoiler Bar Failures By Jim Johnson, Helmut Thielsch and Susan Freeman Presented at the TAPPI Engineering Conference, September 1995, Dallas, Texas; and Published in the Engineering Conference Proceedings, Book 2, 1995, pp. 565-581 and The TAPPI Journal, Vol. 79, No. 4, pp. 83-90, April 1996 Inspection of Surface Defects in Paper Machine Dryer Cans By Helmut Thielsch, Nancy Hoffman and Jonathan Freeman

Presented at TAPPI Engineering Conference, September 1995, Dallas, Texas; and Published in the Engineering Conference Proceedings, Book 2, 1995, pp. 583-593 Failures in Urea Reactors Presented at the AIChE Ammonia Symposium, September 1995, Tucson, Arizona; and Published in AMMONIA PLANT SAFETY (AIChE Technical Manual), Vol. 36, pp. 232-253, 1996 Repair Welding of a High Pressure Turbine Casing Subject to Thermal Fatigue Cracking and Original Manufacturing Defects By Matthew Dowling, Helmut Thielsch and Darrell Wisner Presented at the POWER-GEN Americas '95 Conference, December 1995, Anaheim, California Induction Heating Coil Design for Materials Testing Applications By David Spenciner Reprinted from TEST Engineering & Management, Vol. 57, No. 6, pp. 12-13, December/January 1995-96 Microbiological Activity and Chlorides Cause Carbon Steel Pipe Pitting By Susan Freeman and Helmut Thielsch Reprinted from MATERIALS PERFORMANCE, Vol. 35, No. 3, pp. 65-66, March 1996 Repair Welding of the Control Valve Steam Chest at the Barry Steam Station, Unit No. 3, Alabama Power Company Presented at the EPRI Conference on Welding and Repair Technology for Power Plants, May 1996, Daytona Beach, Florida, and Published in the Conference Proceedings, Session 10 - Turbine Casings, Steam Chests, Diaphragms, Stop Valves, January 1997, pp. 663-677 Accelerated Fatigue Testing By David Spenciner and Muhammed Ovase Reprinted from ADVANCED MATERIALS & PROCESSES, Vol. 150, No. 5, pp. 29-30, November 1996 Microbiological Corrosion in Municipal Water Treatment Plant Piping By Helmut Thielsch and Susan Freeman Reprinted from WATER Engineering & Management, Vol. 144, No. 5, pp. 18-19, May 1997 Texas Facility Investigates Catastrophic Failure Reprinted from Chemical Processing, Vol. 60, No. 5, pp. 50-52, May 1997 Explosions, Critical Exposures and Leaks in Recovery Boilers Presented at the TAPPI Engineering Conference, October 1997, Nashville, Tennessee; and Published in the Engineering Conference Proceedings, Book 2, 1997, pp. 527-565 Stress Analysis of Overhung Flange and Head Sections in Yankee Dryers By T. H. Service, Ph.D., P.E. and A. Nalbandian, P. E. Presented at the TAPPI Engineering Conference, October 1997, Nashville, Tennessee; and Published in the Engineering Conference Proceedings, Book 2, 1997, pp. 705-708 Nondestructive Examination of Structure

By Richard DeWolf Presented at Construction New England '99, May 1999, Boston, Massachusetts Failure Analysis and Repair Welding of Superheater Outlet Header Subject to Thermal Fatigue Cracking By Helmut Thielsch, Florence Cone, Robert Smoske and Jason Husband Presented at the 50th Annual Generation Conference of the Association of Rural Electric Generating Cooperatives (AREGC), June 1999, Biloxi, Mississippi. Complete copy of paper available from Thielsch Engineering. (Abbreviated version was also published in ADVANCED MATERIALS & PROCESSES, Vol. 157, No. 2, pp. 43-44, February 2000.) The Sense and Nonsense of Seam Welded Pipe Inspections - Sharing 40 Years of Experiences By Helmut Thielsch, Florence Cone and Peter Kennefick Presented at the EPRI 5th Piping & Bolting Inspection Conference, June 1999, San Antonio, Texas. Complete copy of paper available from Thielsch Engineering. (Abbreviated version was also published in POWER, Vol. 144, No. 1, pp 49, 50 and 52, January/February 2000.) Selection and Application of Nondestructive Examination Techniques for Non-Metal Components By Richard H. DeWolf, Nancy Hoffman and Jon Freeman Presented at the Maintenance and Reliability Conference, May 2000, Knoxville, Tennessee Maximizing the Safety of Critical Piping Systems by Meaningful and Cost-Effective Inspections and Repairs By Helmut Thielsch, Florence Cone and Peter Kennefick Presented at the 6th Annual Outage "Best Practices" Conference, NUS Information Services, August 2000, Clearwater Beach Florida Development of Paper Machine Dryer Inspection Guidelines By Roland O'Brien-Bills, Nancy Hoffman and Richard H. DeWolf Presented at TAPPI Engineering Conference, September 2000, Atl;anta, Georgia Reference Book: Defects and Failures in Pressure Vessels and Piping By Helmut Thielsch, P.E. Published by Robert E. Krieger Publishing Co., Inc. Available from Thielsch Engineering, Inc. at $49.50 plus $5.00 shipping Copies of any of the above articles are available by contacting: Publications Department THIELSCH ENGINEERING, INC. 195 Frances Avenue, Cranston, RI 02910 Telephone: (401)467-6454 Fax: (401)467-2398