Discussion on Improving Accuracy of Caliper Inspection for Long-distance Pipeline

Caliper inspection for long-distance pipeline is influenced by many factors. Sometimes there is actually no abnormal deformation of pipeline, but the caliper plate has deformation and goffer and it indicates disqualified results. The factors affecting caliper inspection accuracy are analyzed. It was tried that after the hydraulic test finished and in first water scavenging, another caliper inspection was carried out. Thus the caliper plate damage caused by impact owing to pig leather cup abrasion and pig overquick moving could be avoided furthest. The accuracy of caliper inspection for long-distance could be increased and ensured.