減圧弁を用いた低圧化パイプラインの圧力脈動に対する安全弁による抑制対策の効果

抄録

  In this study, self-excited pressure vibration in low-pressure pipelines with pressure reducing valves was evaluated based on the results of field measurements of current issues and countermeasures by safety valves. As a result, it was found that installing a safety valve upstream of the pressure-reducing valve is effective. In addition, this study numerically models the function of safety valves, which are expected to be effective in suppressing pressure vibration in low-pressure pipelines. Furthermore, the reproducibility of the numerical model was verified by simulating the results of field tests conducted on a local pipeline where a safety valve was installed as a countermeasure against self-excited oscillatory pressure vibration. In addition, the relationship between the maximum pressure generated upstream of the pressure-reducing valve and the effective area of the safety valve was determined through numerical analysis to determine the optimal size of the safety valve.