Sealing Performance Analysis of Natural Gas Pipeline Venting and Nitrogen Injection Device Based on Numerical Simulation and Experiment.

A new type of sealing device is designed for the temporary venting and nitrogen injection of the natural gas long-distance pipeline station under the current emergency condition. The finite element analysis and laboratory test of the device are carried out, and the results of the two are compared and analyzed; furthermore, to meet the higher bearing pressure requirements, the device was structurally improved and again subjected to finite element analysis. The above results show that the pressure-bearing capacity of the designed sealing device can reach 5 MPa, which meets the field work requirements; after the improvement, the von Mises stress of the O-ring is evenly distributed, and the value is only 36% of that before the improvement, while the contact stress is 181% of that before the improvement, and the sealing performance of the O-ring is enhanced. [ABSTRACT FROM AUTHOR]