MARVIN J. COHN, P.E.
Manager, High Energy Piping Systems

SPECIALIZED PROFESSIONAL COMPETENCE

EQUIPMENT

INDUSTRIES

RECENT WORK

• Development and implementation of an integrated methodology for predicting the
  safe reexamination interval and remaining useful life of high energy piping and
  headers.
• Simulation of high energy piping predicted displacements to field measurements for
  more accurate stress predictions.
• Corrective action of construction and in-service anomalies for hangers and welds.
• Detailed stress analysis of saddle welds, girth welds, and longitudinal seam welds.
• Life management of main steam and hot reheat piping systems.
• Participated on more than 170 high energy piping system projects since 1985.
• Litigation support
• Author of more than 40 technical papers, including 4 professional journal papers
• Recent flow-accelerated corrosion work has included sales and project management
  of a pulsed eddy current technique for on-line wall thickness measurements.

EDUCATION AND PROFESSIONAL BACKGROUND

• M.S. (Engineering), University of California, Los Angeles (1978)
• Advanced Statistics, Advanced Mathematics Courses, California State University, Northridge (1976)
• B.S. (Physical Metallurgy), University of Washington (1969)
• Member of National Council of Examiners for Engineering and Surveying
• Licensed Professional Engineer, Civil, State of California C38007
• Licensed Professional Engineer, Alberta, Canada M68997
• Licensed Professional Engineer, State of New Mexico 18203
• Licensed Professional Engineer, State of North Carolina 032821
• Licensed Professional Engineer, Civil, State of Arizona 47400
• Member, American Society of Mechanical Engineers (ASME)
• Member, ASME B31.1
• ASME Fellow Grade

SELECTED REPORTS, PUBLICATIONS, AND INVITED LECTURES

Main Steam and Hot Reheat Piping System Evaluations at Centralia Steam Plant, Unit 2, APTECH Report AES 06036133-2-4 (November 2007).

Evaluation of Construction, APTECH Report AES 07096625-5-1 (September 2007).

Risk-Based Inspection Applied to Main Steam and Hot Reheat Piping Systems, APTECH Technical Paper TP174, Proceedings of PVP2007 ASME Pressure Vessel and Piping Division Conference, July 22-26, 2007, San Antonio, Texas, PVP2007-26375 (July 2007).

Main Steam and Hot Reheat Piping System Evaluations at Colstrip Steam Electric Station, Unit 1, APTECH Report AES 06086239-2-1 (April 2007).

Boiler Feed Water Piping System Evaluation at the Centralia Power Plant, Units 1 and 2, APTECH Report AES 06096268-2-1 (March 2007).

Main Steam, Hot Reheat, and Cold Reheat Piping System Evaluations at El Segundo Power Plant, Unit 4, APTECH Report AES 06016050-2-3 (January 2007).

Main Steam, Hot Reheat, and Cold Reheat Piping System Evaluations at El Segundo Power Plant, Unit 3, APTECH Report AES 06016050-2-2 (December 2006).

Encina Unit 4 Issues, APTECH Report AES 06026069-2-1 (December 2006).

Life Management Projects for Three Main Steam Piping Systems, APTECH Technical Paper TP158, Presented at the EPRI International Conference on Advances in Condition and Remaining Life Assessment for Fossil Power Plants, Louisville, Kentucky (October 2006).

A Strategy for Life Management of Main Steam and Hot Reheat Piping Systems, APTECH Technical Paper TP159, Presented at the EPRI International Conference on Advances in Condition and Remaining Life Assessment for Fossil Power Plants, Louisville, Kentucky (October 2006).

Rebuttal of SMUD Expert Reports Fru-Con Construction Corporation v. Sacramento Municipal Utility District, APTECH Report AES 05115983-24-2 (October 2006).

Expert Report of Aptech Engineering Services, Inc. In the Matter of Fru-Con Company v. Sacramento Municipal Utility District, APTECH Report AES 05115983-24-1, with M. Cronin (September 2006).

Life Management of Main Steam and Hot Reheat Piping Systems Part 1, APTECH Technical Paper TP161, 2006 ASME Pressure Vessels and Piping Division Conference, July 23-27, 2006, Vancouver, B.C., Canada, PVP2006-ICPVT11-93627 (July 2006).

Life Management of Main Steam and Hot Reheat Piping Systems Part 2, APTECH Technical Paper TP162, 2006 ASME Pressure Vessels and Piping Division Conference, July 23-27, 2006, Vancouver, B.C., Canada, PVP2006-ICPVT11-93628 (July 2006).

Main Steam, Hot Reheat, and Cold Reheat Piping System Evaluations at Four Corners Power Plant, Unit 3, APTECH Report AES 06016034-2-4 (July 2006).

Main Steam, Hot Reheat, and Cold Reheat Piping System Walkdowns at Cholla Generating Station, Unit 3, APTECH Report AES 05116009-2-1 (June 2006).

Main Steam, Hot Reheat, and Cold Reheat Piping System Evaluations at Colstrip Steam Electric Station, Unit 2, APTECH Report AES 05015661-2-1 (May 2006).

RTD-INCOTEST Examination at Wolf Creek Electric Generating Station, APTECH Report AES 06026068-2-1 (May 2006).

RTD-INCOTEST Examination at Colstrip Steam Electric Station, Units 3 and 4, APTECH Report AES 05116003-2-1 (April 2006).

Main Steam, Hot Reheat, and Cold Reheat Piping System Evaluations at Four Corners Power Plant, Unit 4, APTECH Report AES 05105948-2-2 (March 2006).

RTD-INCOTEST Examination at Calvert Cliffs Nuclear Power Plant, Units 1 and 2, APTECH Report AES 06016027-2-1 (February 2006).

RTD-INCOTEST Examination at Chevron Oil Company Richmond Refinery, APTECH Report AES 05126012-2-1 (January 2006).

Main Steam and Hot Reheat Piping System Evaluations at Port Jefferson Generating Station, Unit 3, APTECH Report AES 05055779-2-3 (January 2006).

Main Steam, Hot Reheat, and Cold Reheat Piping System Evaluations at San Miguel Steam Electric Station, Unit 1, APTECH Report AES 05035735-2-4 (January 2006).

Main Steam, Hot Reheat, and Cold Reheat Piping System Evaluations at Merom Station, Unit 2, APTECH Report AES 05035711-2-1 (December 2005).

Main Steam and Hot Reheat Piping System Evaluations at Centralia Steam Plant, Unit 1, APTECH Report AES 05025683-2-3 (December 2005).

Main Steam, Hot Reheat, Cold Reheat, and Convection Pass Piping System Evaluations at Four Corners Power Plant, Unit 5, APTECH Report AES 05025673-2-2 (November 2005).

Cohn, Marvin J., Henry, J.F., and Nass, Daniel E., Fabrication, Construction, and Operation Problems for Grade 91 Fossil Power Components, Transactions of the ASME, Journal of Pressure Vessel Technology, Vol. 127, pp. 197-203 (May 2005).

Evaluation of Short and Long-Term Creep Rupture Properties for Grade P91 Materials, APTECH Technical Paper TP168, Proceedings of PVP 2005 ASME Pressure and Vessels and Piping Division Conference, July 17-21, 2005, Denver, Colorado (July 2005).

Main Steam, Hot Reheat, and Cold Reheat Piping System Evaluations, Phase 3, Sundance Generating Station, Unit 1, APTECH Report AES 04065435-2-1 (October 2004).

Cohn, Marvin J., An Estimator for the Influence of Service Temperature on Creep Rupture Life, 2004 ASME PVP Conference, Fitness for Service, Life Extension, Remediation, Repair, and Erosion/Corrosion Issues for Pressure Vessels and Components, PVP-Vol. 471, pp. 93111 (July 25-29, 2004).

Cohn, Marvin J. and Norton, Jordan W., Case Studies of Pulsed Eddy Current to Measure Wall Loss in Feedwater Heater Shells, 2003 ASME PVP Conference, Design and Analysis Methods and Fitness for Service Evaluations for Pressure Vessels and Components, PVP-Vol. 459, pp. 53-62 (July 21-24, 2003).

Cohn, Marvin J. and Nass, Daniel, Creep Life Prediction for High Energy Piping Girth Welds Case History – Cholla Unit 2, 2002 ASME PVP Conference, Pressure Vessel and Piping Codes and Standards, PVP-Vol. 439, pp. 83-88 (August 5-9, 2002).

Cohn, Marvin J., The TransAlta High Energy Piping Program – A Five Year History, Transactions of the ASME, Journal of Pressure Vessel Technology, Vol. 123, pp. 65-69 (February 2001).

Cohn, Marvin J. and Yee, Raymond K., Creep Relaxation Behavior of High Energy Piping, Transactions of the ASME, Journal of Pressure Vessel Technology, Vol. 122, pp. 488-493 (November 2000).

Cohn, Marvin J., Comparison of Flow-Accelerated Corrosion Prediction and Field Measurement Results, 1999 ASME PVP Conference, Service Experience in Fossil and Nuclear Power Plants, PVP-Vol. 392, pp. 15-24 (August 1-5, 1999).

Cohn, Marvin J., High Energy Piping Reexaminations, Fewer Locations, Higher Confidence, 1997 ASME PVP Conference, Fitness for Adverse Environments in Petroleum and Power Equipment, PVP-Vol. 359, pp. 27-35 (July 27-31, 1997).

Cohn, Marvin J., Remaining Life of High Energy Piping Systems Using Equivalent Stress, Transactions of the ASME, Vol. 112, Journal of Pressure Vessel Technology, pp. 260-265 (August 1990).

Cohn, Marvin J., Mathematical Simulation of Thermal Displacements for a Steam Piping System in the Material Creep Regime, 1989 ASME PVP Conference, Design and Analysis of Piping and Components, PVP Vol. 169, pp. 105-111 (July 23-27, 1989).