Carbon steel is used extensively in piping systems of power generating plants. When high temperature pressurized water and steam flow through the piping at high speed, erosion/corrosion could occur and cause wall thinning in the piping. To evaluate seismic performance of locally thinned piping is one of the important issues. It is a matter of argument if the failure mode during large seismic event is one of or combination of collapse, buckling and fatigue with ratcheting. Collapse caused by excessive progressive deformation during cyclic loading is a point of controversy as a failure mode to be considered in seismic design for piping system.
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