The City of Miami Beach Utilizes CIPP to Structurally Renew 20” Water Main Crossing

摘要

The existing subaqueous 20” cast iron potable water main crossing under Collins Canal was built in 1967, and is a branch of one of the major transmission lines that supplies drinking water to the City of Miami Beach (the City). Over the course of its life, the City reported that the water line, which included several bends, had been repaired a couple of times using divers. This transmission line supplies drinking water to approximately 11,000 people in the West Avenue and Flamingo Neighborhoods, bounded to the North-South by 17th Street and 5th Street, and to the East-West by Ocean Drive and Biscayne Bay.Pipeline inspection revealed longitudinal and circumferential cracking, indicating that additional repairs were needed. The City opted to use an NSF-61 certified, Class IV, fully structural cured-in-place pipe (CIPP) process over directional drilling and open cut excavation because it minimized disruption to area residents and satisfied local environmental concerns by not disturbing the bottom of the canal. The minimally invasive CIPP process allowed for the renewal of the old water main while providing increased flow rates and extending its service life. The CIPP lining was completed successfully in July 2016 in less than thirty (30) days, which included chlorination and pressure testing.