起伏管道初始扫水最佳清管方案与残余水分布规律

Optimal pigging scheme and residual water distribution law in the initial pigging of undulate pipelines

起伏管道低洼处存在积水会严重危害管道运行。通过试验研究了山区大起伏管道初始扫水阶段最佳清管扫水方案,并明确了低洼处残余水量计算方法:在初始扫水阶段宜选用直板清管器进行清管扫水作业,直板清管器最佳速度范围为3.6~7.2 km/h,过盈量宜选取4%~5%。通过改变管道特征分析清管器漏水量的影响,获得不同坡长、坡度、焊缝及弯管工况对清管器漏水量的影响规律,进而通过理论分析建立了应用于现场计算低洼处残余水量以及管壁平均水膜厚度的计算方法。研究结果可为后续的深度扫水作业及干燥作业提供借鉴与支持。

Water accumulation in the low-lying areas of undulate pipelines will seriously threaten the operation of pipelines.Herein,the optimal pigging scheme for the initial pigging stage of the large undulate pipelines in mountainous areas was studied by test,and the calculation method for the volume of residual water in the low-lying area was proposed.The straight plate pig should be adopted in the initial pigging stage.Definitely,the optimum speed range of the straight plate pig should be 3.6-7.2 km/h,and the interference should be 4%-5%.Specifically,the water leakage of pigs was analyzed by changing the characteristics of pipelines,and thus the influence rules of different slope length,gradient,weld and elbows on water leakage were obtained.On this basis,the calculation method for the residual water volume and the average water film thickness on the pipeline wall in the low-lying areas was put forward through theoretical analysis.The research results could to provide reference and support for the subsequent deep pigging and drying operations.