Exactly. The old ones were basically passive cleaners. The modern ones are full on inspection tools with cameras, magnometers, etc.
We have a natural gas line running through one of our agency properties, and it was recently repaired due to the pig's findings.
Basically the engineers running the pig mark sections of the pipe that need physical inspection. The crews come out, dig it up, and repair or replace a section depending on how bad it is. Or do nothing if the engineers see that it's nowhere near as bad as they thought.
We have a natural gas line running through one of our agency properties, and it was recently repaired due to the pig's findings.
Basically the engineers running the pig mark sections of the pipe that need physical inspection. The crews come out, dig it up, and repair or replace a section depending on how bad it is. Or do nothing if the engineers see that it's nowhere near as bad as they thought.