Differences in dynamic response of typical class II piping due to restraint method and input amplitude

A 50-foot (15.2 m) section of pressurized 8-inch and 6-inch (200 mm and 150 mm) piping with multiple bends and a simulated motor-operated valve was tested using shake table techniques to note differences in piping response and in stress levels due to the incorporation of four different pipe restraint devices. These devices included a rigid element, a mechanical shock arrestor, a hydraulic snubber, and a new, unique triaxial visco-elastic piping damper. The latter device was configured in two ways. (orig.)