Severe cracking has occured in a power station gas turbine exhaust duct, 30mbar pressure and 500C temperature with turbulent conditions and high temperature ramp rates. The cracked pressure boundary is 8mm Coreten A steel material. The duct has internal and external insulation ('warm' casing). Cracking has been happening over a number of years and even repaired (welded) cracks have reopened at the repair. The duct is rectangular and approx. 7m by 8m with a 90 degree bend and has three banks of LF/HF internal baffles.
Has anyone seen this behavior before? short term repair method? long term solution?
Red Flag Submitted
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action.
Reply To This Thread
Posting in the Eng-Tips forums is a member-only feature.
When was the last time you drove down the highway without seeing a commercial truck hauling goods?The ubiquity of these machines underscores the important roll they play in modern commerce. Download Now