Full Content is available to subscribers

Subscribe/Learn More  >

Corrosion Fatigue Failures of Economizer Outlet Header Stub Tubes

[+] Author Affiliations
Fred V. Ellis

Tordonato Energy Consultants, Inc., Chattanooga, TN

Paper No. PVP2006-ICPVT-11-93111, pp. 447-454; 8 pages
  • ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference
  • Volume 3: Design and Analysis
  • Vancouver, BC, Canada, July 23–27, 2006
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4754-3 | eISBN: 0-7918-3782-3
  • Copyright © 2006 by ASME


Nondestructive and metallurgical examinations were performed following the failure of a stub tube for an economizer outlet header. The leak in the header stub tube was at circumferentially oriented cracks that initiated at the inside surface. The cracked regions were approximately 180° apart circumferentially and located on the sides of the tube inline with the header axis. This cracking pattern is consistent with an applied bending moment that is out of the plane of the tubing assemblies. The ultrasonic inspections used the failed tube as a calibration standard. The deepest cracks (reflectors as a percent of calibration standard) were found primarily at the ends of the header, the first sixteen rows from the north end and the last twenty-two from the south end. The cracking at the ends of the header is believed to be due to thermal loads and the restraint to expansion of the economizer tubing at the crown seals. Both cracked and failed tubes were metallurgically examined using visual inspection, fractography, and optical metallography. The fracture surface has beach marks and the crack shape is thumbnail or semi-elliptical, characteristic of fatigue cracking. There are multiple cracks and many of the shorter crack segments have joined or linked up to form the final crack length. The cracks are transgranular and oxide-filled. The failure mechanism is corrosion fatigue.

Copyright © 2006 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