2009 Project Success Highlights

Project:  A USA power plant found longitudinal and circumferential cracks in their boiler's 8 inch, 650psig, 950 deg F steam pipe for export steam. The cracks were downstream of the desuperheater and the original configuration did not include an internal thermal liner to protect the pipe wall from the water spray. HRST supplied a new section of pipe which included a mounting designed for their new desuperheater spray probe, plus a thermal liner to avoid future water spray thermal shock. Our on-site technical advisor helped to ensure that the installation contractor followed all applicable code criteria for a successful installation.

Above Left:  Retrofit Desuperheater Assembly.  Above Right:  Retrofit IP Economizer Headers

Project:  Inspection revealed an HRSG economizer design that creates stress during start-ups and shutdowns.  Reliability was important for the client, so we modified the design and supplied the needed retrofit IP economizer headers.

More 2009 Project Successes:

1. Many, many HRSG inspection and troubleshooting projects.
2. Liner plates, studs and technical advisor to repair HRSG inlet duct damaged.
3. HRST Shockmaster economizer conversion engineering.
4. Retrofit IP Economizer headers for improved cycling of HRSGs.
5. HRSG flow distribution perforated plate design and fabrication.
6. Improved pipe penetration seals for HRSG sidewall, floor and roof pipes.
7. Replacement liner system design for HRSG floor liner.
8. Reheater desuperheater temperature monitoring kit.
9. Economizer replacement fabrication drawings.
10. Boiler Superheater Tube Support Improvements.
11. Designed improved HRSG gas baffling improvements
12. Designed Superheater Drain System improvements
13. Steam drum manway door, hinges and gasket alignment kits.
14. Supply of improved retrofit HRSG Access doors.

2008 Project Success Highlights

Project:  Shortly after their 2008 plant commissioning, a client experienced failed fabric pipe penetration seals in the high temperature Superheater/Reheater section. After having difficulties with the OEM on getting a better design, the plant came to HRST for a solution. First we inspected their arrangement to assess their needs. Some of their pipe seals required allowance for extra lateral expansion and angular rotation on the piping. In the end, we provided 18 bottom seals, 20 roof seals, 16 inner liner donuts and 1 access door. Problem solved!

Before                                                   After

More 2008 Project Successes

1. HRSG Inspection and Troubleshooting: 160+ HRSG’s in 2008.
2. Numerous HRST retrofit Pipe Penetration Seals supplied for HRSGs.
3. Designed and supplied the first triple-pipe penetration gang seal.
4. Redesign existing tube ties/supports to eliminate tube rattle and vibration at several HRSG plant sites.
5. Provided tube bundle cleaning procedures and tools for several HRSG plants.
6. Supplied new evaporator tube panels and a technical advisor to improve HRSG reliability.
7. Designed and supplied a complete casing, liner and penetration seal replacement under hot section of an HRSG.
8. Designed and supplied three retrofit HRST Shockmaster economizers to improve HRSG reliability.
9. Supplied tube material for emergency tube repairs.
10. Redesigned a steam separation system in steam drum to avoid carryover.

This list is only a portion of our 2008 projects.  Give us a call to see if we have tackled your problem on a previous project.