Safety analysis of in-service pipelines crossing large-diameter long-distance pipelines
With the accelerating process of long-distance oil and gas pipeline engineering,there are more and more cases of new pipelines crossing in-service pipelines.To study the safety of new pipelines crossing the in-service ones,a detailed introduction to the crossing engineering plan was offered with a newly constructed natural gas pipeline crossing in-service ones as an example.Theoretical analysis was used to calculate the maximum allowable suspended length for the in-service pipelines,providing a theoretical basis for the new pipelines crossing the in-service ones;Numerical simulation was applied to analyze the stress and displacement status of in-service pipelines after tunnel excavation and backfilling.The results show that when the excavation width of the cross crossing is 5 m,the suspended length of the in-service pipeline meets the safety requirements.After tunnel excavation and backfilling,the maximum MISES stress borne by the in-service pipeline is less than the allowable stress of the pipeline,and the displacement of the in-service pipeline meets the regulatory requirements.This method is of reference value for analyzing the safety of similar new pipeline crossing in-service pipeline engineering.
NETL
NSTL
万方数据
