How deep can one cut concrete by methods that burn metal powder in oxygen?
The powder lance could conceivably be used to cut holes to almost any depth, but practically it is used for holes up to about 12 feet deep. In the blowpipe method a tool is mounted on a carriage which advances it along the surface at 1 ½ to 2 ½ inches a minute. The tool will cut to depths of about 18 inches.