库-鄯输油管道大落差压力控制工艺

Pressure Control Technology for the Big Drop of Ku Shan Oil Pipeline

在库－鄯输油管道工艺设计中，对于大落差管道选用减压阀进行压力控制，解决低点静压超高和高点后管段产生液柱分离（不满流现象）问题；利用减压阀节流消除高点至末站间约７６０ｍ落差位能，克服高点至末站沿程长约２０７ｋｍ摩阻损失后，剩余能量维护高点正压运行；通过减压阀控制下游管段动压，使动压（剩余压力）控制在管道运行操作压力允许范围。可实现全线停运关断减压阀，切断大落差管段，分段管线位能（静压）控制在管道允许承压范围，达到节省管材（减少管子壁厚）的目的，增加了管道系统安全可靠性。

Abstract To select pressure reducing valve and to control pressure for the big drop pipeline section in the technology design of Ku Shan oil pipeline can solve the problem of superhigh static pressure at low point and liquid column separation (slack of pipeline) in the section after high point; and utilize a pressure reducing valve to throttle and eliminate the gravitational energy about 760 m between high point and terminal station. The surplus gravitational energy can keep positive pressure at high point in operation after friction loss about 207 km along from high point to terminal station is overcome; and dynamic pressure (remaining pressure) is controlled in the allowable range of pipeline operation pressure through the dynamic pressure controlled by pressure reducing valve at the downstream pipeline section. Therefore shutting off the pressure reducing valve, turning off the big drop pipeline section, controlling the gravitational energy (static pressure ) of segment pipeline in the allowable range of pipeline pressure along the whole line can be realized so that the objective of saving pipe material (reducing pipe wall thickness) can be reached and the safety and reliability of pipeline system can be also improved.