Full Content is available to subscribers

Subscribe/Learn More  >

Steam Turbine Valve Testing, Inspection and Maintenance to Avoid Turbine Overspeed Events

[+] Author Affiliations
Kuda R. Mutama

Newmont Nevada Energy Investments, Battle Mountain, NV

Paper No. POWER2011-55150, pp. 507-514; 8 pages
  • ASME 2011 Power Conference collocated with JSME ICOPE 2011
  • ASME 2011 Power Conference, Volume 1
  • Denver, Colorado, USA, July 12–14, 2011
  • ISBN: 978-0-7918-4459-5
  • Copyright © 2011 by ASME


Steam turbine valves are the most important components before a steam turbine for the admission and control of steam flow. Steam turbine valve configurations can be all in one body or as individual valves for the large units, for the main stop (throttle) and control functions for each section of the steam turbine. Today’s thermal power plants for drum or once-through type supercritical boilers produce very high temperature steam in the final superheat and reheat section of 1055 °F or higher requiring special boiler tube metal alloys, some of which are subject to steam oxidation as in austenitic steels. The oxidation material is mainly in the form of iron oxide or magnetite which is subject to exfoliation. The exfoliated oxide material is carried over to the steam turbine valves and to the high and intermediate pressure turbines. The effect of exfoliated oxide material in valve and turbine components is to cause solid particle erosion (SPE) and therefore shortening the life of those parts due to damage. As time goes by if valves are not tested and do not meet their inspection and maintenance schedule they will build up oxidation material to form scale material called blue blush and eventually they stick and will not shut properly.

Copyright © 2011 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In