长输天然气管道在地形起伏山区地段的清管

长输天然气管道在地形起伏山区地段清管时,必须考虑高程差引起的重力位能变化对水力计算的影响,以及管道中积水注静压阻力对清管器运行速度的影响。依据长输天然气管道清管作业规程SY/T6383-1999,结合榆济管道汾阳-武乡段清管作业实际,针对5次清管作业清管器的运行速度和运行区间的压差进行统计分析,总结了管道积水静压阻力、地形起伏山区诱发段塞流和强烈段塞流对清管作业的影响。通过建立数学模型,简化了积水静压阻力计算公式,建立了分段积水注长度和高程差与积水静压阻力的函数关系式。指出了长输天然气管道在不停输状态下利用清管器对大口径、高压力的北方山区管道进行清管作业的注意事项。

Pigging running of mountain gas pipeline

When pigging running is carried out for mountain gas pipeline, the influence of changed gravitational potential energy induced by the differences of elevation on hydraulic calculation and that of water pressure resistance within the pipe on the travelling speed of pig must be taken into consideration. According to the standard of SY/T6383-1999 and referring to the pigging practice in Fenyang-Wuxiang pipeline section in Yu-Ji Gas Pipeline, a statistical analysis on travelling speed of pig and pressure differences of pipeline section for 5 pigging runnings is made in this paper, and the influences of water pressure resistance, slugging flow and severe slug flow induced by the differences of elevation on pigging running are summarizes. By setting up mathematical model to simplify the calculation formula for water pressure resistance, the authors establish the functional relationship for computing the accumulated water length in different pipeline sections. Technical requirements in pigging running for large diameter and high pressure pipeline at mountain areas with in-line pigging mode are given.