Study on Fatigue Performance of Large Volume Seamless Steel Cylinder Served in CNG Hydraulic Daughter Station System

Abstract

The working condition of cylinder is different from the design which needs high frequency of 20~ 22MPa in hydraulic daughter station system. In order to evaluate the safety of cylinder, the fatigue performance of jumbo cylinder was studied by way of FEA. The results show that cylinder fatigue cycle life is less than 15000 under the pressure range 2~ 36.7MPa and it cannot be used as design working pressure 22MPa. But it can serve in 20~22MPa for infinite loop to meets the requirement of hydraulic daughter station.