Corrosion from Hydrogen Sulfide is the arch enemy of asbestos cement and concrete (reinforced & un-reinforced) pipes, but popular to be Electro Scanned.
Originally developed for water applications, AC pipe was only used in sewer applications in the late 60s and early 70s. Holding up better than just plain unlined concrete, due to the asbestos content, AC pipes, particularly in sewers, have needed a technology to judge levels of corrosion, best handled by Electro Scan.