Pipeline Crawler HR-90 is used for nondestructive test of butt welds in pipes. It features compact design, light weight, high stability and the ability of adjusting speed automatically according slope. It is able to memorize the parameter that set by user last time and the error code which can be used to work out the cause of the failure. This crawler is designed to come back from the pipeline even if the electric motor driver module or others module has no power supply.