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.
As the semiconductor industry races to keep pace with Mooreâ€™s Law, which regards the doubling of transistors per square inch on integrated circuits, lithography hardware systems are not always able to provide a quality image for creating circuits. Download Now
Current integrated circuit (IC) designs are complex, which can result in different voltages being located close to one another. To prevent time dependent dielectric breakdown (TTDB), it is essential to incorporate space rules within IC design. Download Now