Complex pipe can be established by the method of back pressure pigging, caliper.
复杂的管道可采用建立背压的方法进行清管、测径。
The purpose of the pipeline pigging is clear in pipe welding of mud, welding slags sundry, for pipeline caliper and normal operation of pipeline to provide security.
管线清管的目的是清除焊接时留在管道内的泥沙、焊渣等杂物，为管线测径和管线正常运行提供保障。
Pigging and caliper with clear pig diameter than pipe diameter usually to interference by 5% to 8%.
清管和测径用的清管器直径通常比管道内径要过盈5%至8%。
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