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)...
A reheat pipe has been operating for approx. 30 years between boiler and turbine. It is proposed to cut the pipe at the turbine end to replace a nozzle. Design of restraints is required to maintain the cold pipe position for rewelding.
The initial construction required cold pulling. My question...
