Abstract
Piping systems for steam or gases with a pressure reducing device can cause acoustically induced vibration, resulting in material fatigue failure in process plant. Numerical investigation using sound-structure interaction analysis has been done to find the possible solution to reduce the dynamic stress level in the piping structure. The result shows that appropriate reinforcing of the pipe structure such as use of circumferential stiffener rings change the structural characteristic and reduce the maximum stress in the pipe wall. Stress generated by the thrust load is also evaluated. The effect of stress reduction by stiffener ring can be larger for acoustic excitation than that for thrust load. Structural natural frequency is applied to evaluate the effectiveness of reinforcement of piping structure.
