济淄天然气管道清管收球速度的控制

Control of receiving velocity during pigging for Ji-Zi Natural Gas Pipeline

为合理控制济淄天然气管道清管过程中的收球速度,基于清管器运行速度的准确计算,分别采用二次收球和调整收球流量的方法控制收球速度,规避清管器撞击盲板的风险。根据SY/T 5922-2003《天然气管道运行规范》,将清管器运行速度视为与天然气流速相同,推导出了运行速度测算公式,利用该公式测算出的理论值与实际值的最大相对误差不超过6%。通过对济淄管道16次清管作业的收球数据进行总结分析,结果表明:清管器质量越大,收球流量越大,接收到清管器的位置距离收球筒盲板越近,清管器撞击盲板的风险越大。研究成果和实践经验可为清管器速度控制提供依据。(图3,表2,参6)。

In order to reasonably control the receiving velocity during the pigging of Ji-Zi Natural Gas Pipeline, secondary pig catching and receiving flowrate adjusting are respectively adopted on the basis of accurate calculation of the traveling velocity of the pigging device, thereby avoiding the risk that the pigging device hits the blind plate. According to the SY/T 5922-2003 Operation Criteria of Natural Gas Pipeline, the traveling velocity of pig is assumed to be the same as the flowrate of natural gas, and the traveling velocity calculation formula is thereafter derived. The maximum deviation between the actual traveling velocity and the calculated traveling velocity based on the formula is less than 6%. Comprehensive analysis data from the pig receiving velocity in 16 tumarounds in the Ji-Zi Gas Pipeline shows that when the mass of pig becomes larger, the receiving flowrate will get larger, and the distance between the receiving blind plate and the position where the pig is received will get closer, and the risk that the pig hits the blind plate will get higher. The research result and practical experience provide a basis to the control of pig＇s traveling velocity. （3 Figures, 2 Tables, 6 References）