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?
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