Almost every job is difficult when it comes to spray-lining or sliplining aging sewer lines.
But even after rehabbing tens of thousands of feet of sewer lines using these techniques over the years, it’s still easy for Nick Marra, vice president of Marra Services, to pick out the most challenging job the company has ever tackled: sliplining a large-diameter, roughly 1,900-foot-long sanitary sewer interceptor line in Detroit.“We sliplined a 17-1/2-foot-diameter sanitary concrete pipe that was deteriorating from gas fumes,” he says. “The 16-1/2-foot-diameter pipes we used for sliplining were the largest-diameter pipe we’re ever worked with. It was a very difficult
