I recently consulted with the city of Othello, WA on an interesting application for the leak seal product Spetec PUR HighFoamer.
A galvanized corrugated steel pipe was being used for stormwater drainage to an irrigation canal. The pipe had rusted over time, and water was coming out around the pipe causing the bank to erode. The city put a 25' stick of HDPE pipe inside the existing steel pipe. A hole was Vactor'ed out and two zerks were tapped into the to the metal pipe.
Spetec PUR HighFoamer was injected between the metal host pipe and the smaller HDPE pipe. The system was in-service and had flow during the procedure. The Spetec PUR HighFoamer filled the annular space between the two pipes and stopped the water traveling between the pipes.
As you can see in the "before" photograph below, there was a separate outflow stream to the right of the main stream due to leaking in between the pipe layers (outlined by a red oval). The red circle below shows where the stream from the leak was hitting the side of the bank. After Spetec PUR HighFoamer is installed between the pipe layers, the leak is sealed, that separate outflow stream is gone and the bank is no longer getting soaked. The pipe is now functioning exactly as it should.