1. 1Page TÜV SÜD AG ARIPPA Technical Symposium Block Grid Nozzle Modification By TÜV SÜD Industry Service, Inc. August 2009 TÜV SÜD Industry Service, Inc. ARIPPA Technical Symposium August, 2009

2. 2Page TÜV SÜD AG TÜV SÜD Industry Service, Inc. is a subsidiary of TÜV SÜD America, Inc. Parent Company Background TÜV SÜD America, Inc. is a subsidiary of TÜV SÜD AG. TÜV SÜD was established over 140 years ago as a steam boiler inspection association in Germany. Worldwide business approximately $1.4 Billion with over 10,000 employees. Operating in more than 30 countries worldwide TÜV participates in the Steam Boiler, Health Service, Medical, Automotive, Electromechanical, and Product Certification markets.

3. 3Page TÜV SÜD AG Translation of TÜV SÜD TÜV (Technischer Überwachungsverein) English translation: Technical Inspection Association SÜD English translation: South

4. 4Page TÜV SÜD AG Established July 7, 2005 as wholly owned subsidiary of TÜV SÜD America Inc. Established as the steam generation equipment engineering and service subsidiary. Holders of ASME “S”, “U”,“PP” and National Board “R” stamps. Key Management and Operation personnel with extensive service and management experience with all major Boiler OEM’s. TÜV SÜD Industry Service, Inc. Background

5. 5Page TÜV SÜD AG TÜV SÜD Industry Service, Inc. Contact Information Operations Office TÜV SÜD Industry Service, Inc. 5910 Pacific Center Blvd., Suite 310 San Diego, CA 92121 (858) 550-4780 Fax (858) 638-7236 24 Hr. Emergency Service 1-800-873-9725 www.tuvindustryservice.com Corporate Office TÜV SÜD America, Inc. 10 Centennial Drive Peabody, MA 01960 (978) 573-2500 Fax: (978) 762-7637 Regional Service Center - Jesup TÜV SÜD Industry Service, Inc. 810 E. Pine St. Jesup, GA 31546 (912) 530-7195 Fax (912) 530-7133 Regional Service Center - Fresno TÜV SÜD Industry Service, Inc. 3065 N. Sunnyside, Suite 101 Fresno, CA 93727 (559) 348-1500 Fax (559) 348-1525 Regional Service Center - Ridgecrest TÜV SÜD Industry Service, Inc. 1126 B West Ward Ave. Ridgecrest, CA 93555 (760) 446-7930 Fax (760) 446-7960

6. 6Page TÜV SÜD AG TÜV SÜD Industry Service, Inc. Arrowhead Nozzles

7. 7Page TÜV SÜD AG TÜV SÜD Industry Service, Inc. Bubble Cap Nozzles

8. 8Page TÜV SÜD AG TÜV SÜD Industry Service, Inc. Pigtail Nozzles

9. 9Page TÜV SÜD AG Block Nozzles TÜV SÜD Industry Service, Inc.

10. 10Page TÜV SÜD AG Block Grid Nozzles Design Advantages Include: Minimal Backsifting Pluggage Resistant Fuel Flexibility Eliminates the Riser Pipe Increased Wear Resistance Longer Life Alloy Selection for Problematic Fuels Ease of Replacement Improved Spacing on Grid for Maintenance and Access

11. 11Page TÜV SÜD AG TÜV SÜD Industry Service, Inc. Benefits of Block Nozzles

12. 12Page TÜV SÜD AG TÜV SÜD Industry Service, Inc. Dominion Energy North Branch Block Nozzle Conversion made in Fall, 2008 Conversion of Pigtail Nozzles to Block nozzles Performance Significantly Improved

13. 13Page TÜV SÜD AG TÜV TÜV SÜD Industry Service, Inc. Dominion North Branch Before / After Performance

14. 14Page TÜV SÜD AG TÜV SÜD Industry Service, Inc. Block Nozzle Details

15. 15Page TÜV SÜD AG TÜV SÜD Industry Service, Inc. Block Nozzle Arrangement

16. 16Page TÜV SÜD AG TÜV SÜD Industry Service, Inc. Block Nozzle Installation

17. 17Page TÜV SÜD AG TÜV SÜD Industry Service, Inc. Installation Tasks Remove all existing grid refractory Remove membrane between the grid tubes where the block nozzles will be located. Remove or cut off remaining nozzle stubs. The cut off point for the stubs will be well below the surface of the replacement refractory. Plug tubes of cut off nozzle stubs, by installing plugs or bolts in tubes and welding, alternatively a plate can be welded to the cut nozzles. Apply sealing refractory to the base of the block nozzle. Note groves on the block for this. Set block nozzle in position on tray plenum, inserting the fixing rod down through the hole in tray plenum base. A locating bar is positioned on the tray as an assembly guide. Set the nozzle against the bar, and install the fixing washer against the spacer tube. Tack weld is required on the fixing washer to rod. Trays and nozzles can be assembled outside of the unit, in parallel with the removal of the existing refractory, thus reducing the installation schedule. Weld new tray/nozzle assemblies to the crown of the grid tubes with a full seal weld. Apply ceramic fiber paper or grease around the sides of the nozzle that are in contact with the replacement refractory to facilitate easy removal at a later date, if required. Pour refractory to the height indicated by the specific design drawings.

18. 18Page TÜV SÜD AG TÜV SÜD Industry Service, Inc. Installation Process

19. 19Page TÜV SÜD AG TÜV SÜD Industry Service, Inc. Installation Process

20. 20Page TÜV SÜD AG TÜV SÜD Industry Service, Inc. Installation Process

21. 21Page TÜV SÜD AG TÜV SÜD Industry Service, Inc. Installation Process

22. 22Page TÜV SÜD AG TÜV SÜD Industry Service, Inc. Installation Process

23. 23Page TÜV SÜD AG TÜV SÜD Industry Service, Inc. Installation Process

24. 24Page TÜV SÜD AG Installation Process TÜV SÜD Industry Service, Inc.

25. 25Page TÜV SÜD AG Installation Process TÜV SÜD Industry Service, Inc.

26. 26Page TÜV SÜD AG Installation Process TÜV SÜD Industry Service, Inc.

27. 27Page TÜV SÜD AG TÜV SÜD Industry Service, Inc. Installation Complete