A heavily tuberculated, flaking and rusting 90-foot section of 18-inch carbon steel pipe in a 280-foot clay pipe sewer was a headache for the City of Titusville, Fla.Waste hung up on the tuberculation, causing stoppages that belched sewage up two 15-foot-deep manholes in the center turn lane of a major four-lane highway. Daily cleaning and jetting to open the line caved in the crown, inundating the wastewater treatment plant with mud, sand, and infiltration, as the pipe was below the water table.Vibrations from passing traffic loosened more soil, creating a void that began migrating well below the asphalt toward a
