Pipe blocking technique.

摘要

A method for blocking the bore of a pipe (3) comprising moving an inflatable bag (1) along the bore of the pipe (3) from an access point in the pipe (3) to a point where the bore is to be blocked, inflating the bag (1) until it engages the internal wall of the pipe (3) or main and causing the bag (1) to maintain its inflated condition. <IMAGE>