Experimental data from 14 test programs on dynamic response of piping are reviewed and evaluated. All tests demonstrate the conservatism of the Section III Level D stress limits for seismic loads on piping. These data are useful for quantifying the amount of conservatism in the Level D stress limits. But@ additional evaluation of the data is necessary to establish test margins and trends. Analyses are also required to extrapolate test data to all possible piping configuration@ geometry@ fabrication details@ and pressure loading. It appears that the EPRI systems tests are more severe than the component tests for the fatigue failure mode. To evaluate test data for comparison to code limits@ the appropriate approach is to determine the elastic test response and relate the input load level to the elastically-predicted response. This is the method used in this report to compare test data. Publication of this document - WRC Bulletin No. 423 was sponsored by the University Research Committee of the Welding Research Council@ Inc.