By Nadia Askar | firstname.lastname@example.org Extending life expectancy Pipe relining fixed cracks and holes with little destruction to walls and minimal disruption to condo residents. iron domestic water line with an epoxy barrier coating. This ran from the pump room downstairs, 100 ft. underground, to the mechanical rooms located in the center of the Gulfview up to the 10th floor. Nu Flow then did another project in spring 2012, cleaning and lining the main 4-in. verticals and toilet sweep laterals for four condo stacks (two verticals and two toilets each). In 2013, the scope of the project included 16 4-in. cast-iron verticals and the respective toilet laterals, as well as a 6-in. vertical laundry drain. To date, 26 4-in. vertical sewer stacks (each 220 ft. long), four vertical kitchen stacks (220 ft. long), one 6-ft. vertical laundry stack (220 ft. long) and 530 toilet sweep laterals were cleaned and lined. Alan Linardich , community association manager of the Gulfview property, explains there were three deciding factors in its decision to choose Nu Flow, but the biggest factor was the drywall work. The 4-in. verticals were located in mechanical chases with one-hour-rating firewall all around. “The cost of replacing the firewall and drywall on 21 floors was more than the cost of replacing the pipe itself,” he says. “Nu Flow only needed to open walls every 70 ft. in order to clean and line the pipe. W hen looking for a minimally invasive method to fix cracked or damaged pipe, in some situations a type of trenchless pipe replacement called pipe relining is the best process. Lining pipe is a way to rehabilitate aging pipe systems without the need for traditional removal and replacement. Grant Duxbury , Nu Flow America regional manager, explains the process involves remotely cleaning and then lining the existing pipe from a limited number of access points. “The end result is a new pipe within a pipe, extending the life expectancy of an existing system for many years past its original design life,” he says. Built in 1974, the beachfront Gulfview Club Condominium of Marco Island, Fla., is a 21-story, 265-unit high-rise. Over the years, it sustained the rare toilet sweep issue and an occasional crack showing up on a vertical main, but nothing major. It wasn’t until Hurricane Wilma hit in October 2005 that the swaying of the high-rise put a strain on the bands supporting the verticals and they started snapping. This put more pressure on the 40-year-old cast iron and cracks started showing up throughout the building. The owners wanted to rehabilitate the corroded and deteriorating lines without causing destruction to the building or inconveniencing the residents. In spring 2011, Gulfview decided to hire Nu Flow to clean and line one of four kitchen stacks in the building. The cleaning process took four days and the lining was done in two days. Gulfview hired Nu Flow again in the summer of 2011 to clean and line 200 ft. of 6-in. cast-The pipe on the right is a corroded potable pipe sample and the red pipe on the left is coated with Nu Line process epoxy. 36 Plumbing & Mechanical, April 2014 Photo credit: Nu Flow The hose was a temporary addition during the application of the potable water corrosion barrier. It was used to deliver high volume/pressure air for the application of the process and was removed once the rehabilitation of the pipe was complete.