For small-diameter pipelines, enough space can be excavated, and the damaged pipeline can be removed and replaced with a new pipeline for maintenance; the maintenance of large-diameter pipelines can be completed by flange connection. First cut off the damaged pipeline, and then put the butt welder Into the trench, weld the support ring to each end of the pipe, and then use the flange to connect the replaced pipe. The length of the flange connection must be pre-calculated to suit the spacing between the pipes.
