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Inspections of industrial pipe lines by the robots are essential as these autonomous systems are applied to explore inaccessible positions. Their intelligence and reliability ensure operators to monitor and control various part of the plant from a safe location. The complex geometry, hazardous content materials, pipe bends etc. have forced for judicious designing of the insisted robots. The improvement has grown rapidly and different types of locomotion systems have been introduced. This paper undergoes with locomotion techniques of various IN-pipe and OUT-pipe climbing robots with proper examples. A comprehensive classification of the discussed robots has been prepared based on this study.
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Chattopadhyay et al. (2018) studied this question.
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