Courtesy of InfoSense SL-RAT sends sound waves through pipes to find blockages. The Charlotte-Mecklenburg County, N.C., Utilities Division (CMUD) uses CCTV cameras to inspect its underground sanitary sewer pipes for blockages and interferences, but a new device that sends acoustical waves through sewer pipes is giving the utility a more accurate view.“Often, the [CCTV] images were so dark and murky or the system would get hung up, and we couldn’t get a clear picture,” says John Fishburne, senior engineer in CMUD’s field operations division. “We wound up cleaning pipes that, in many cases, didn’t need it.”In 2005, CMUD commissioned Ivan
The market is generally healthy and steadily growing, and margins are up for large specialty contractors. Further, advances in design tools and owner demand for collaboration are giving subcontractors a seat at the table early on in projects.