METHOD AND APPARATUS FOR INJECTING FOAM INTO A PIPELINE, INCLUDING AN INFLATABLE PLUG

摘要

METHOD AND APPARATUS FOR INJECTING FOAM INTO A PIPELINE, INCLUDING AN INFLATABLE PLUG Method and apparatus for injecting foam into a pipeline. Foam is produced and delivered under pressure to the inlet of a flexible foam-conducting tube. An inflatable plug slidably encircles the tube, so that the tube can be adjusted to extend any desired distance beyond the plug. The plug can be enlarged by inflation to bear against the wall of the pipe and also against the wall of the tube, so as to prevent the foam from flowing back beyond the plug.