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%。
Caliper board depends on the diameter of pipe diameter, and the need to consider the design of pipe diameter changes, general for the minimum 95% of the pipe inner diameter theory.
测径板的直径取决于所测管段的内径，并需考虑到该管段的变径设计，一般为所测管段最小理论内径的95%。
Travel brake type dual-pipe: air over hydraulic caliper disc brake.
脚制动型式：单管路，气顶油，钳盘式四轮制动。
Travel brake type dual-pipe: air over hydraulic caliper disc brake.
脚制动型式：单管路，气顶油，钳盘式四轮制动。
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