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1) the gas steel pipeline system is a continuous closed transportation system.
2) from the transmission, and storage to user use, natural gas is under pressure.
3) due to the small specific gravity of the natural gas being transported, the influence of the static pressure head is much smaller than that of the liquid. when the design height difference is less than 200 meters, the static pressure head can be ignored, and the line is almost not restricted by the longitudinal terrain.
4) there is no water hammer hazard in liquid pipelines.
5) when an accident occurs, it is very harmful and affects a wide range. once the pipeline ruptures, the energy released is large, the tearing length is long, and the discharged natural gas will easily cause a fire if there is an open flame.
