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Problem is helium is expensive and in short supply now.
Had a water leak that never surfaced about 5 year's ago. This was a large open outdoor mall area and didn't have a clue where to look.it took a full tank of helium to finally home in and find the leak. 7' deep in the north 40. I didn't do the job, just assisted with the setup and isolations.
This type of leak detection isn't something I've ever dealt with. I'm curious about using helium to find leaks in UG water piping. I'm assuming that the pipe is blown out or water removed in some way and the line is charged with helium and held under a moderate amount of pressure and then a gas sniffer is used to find the helium coming up through the ground. Is that about it?