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%。
Pigging and caliper with clear pig diameter than pipe diameter usually to interference by 5% to 8%.
测径清管器到达收球筒后，拆下清管器上的测径板，若测径板没有明显变形，测径合格。
The pig to receive clear caliper ball after tube, remove the clear the caliper plate pig, if caliper board did not obvious deformation, caliper qualified.
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