MWRA, Spot Pond

SGH developed emergency repairs to reduce the risk of pipeline burst and stop leakage during a very short window of pipeline down time. We then designed a permanent repair for the pipe going through the dam core. Highlights of our work on this project include the following:

• Inspected the pipe at its interface with the shore face of a wall
• Performed finite element soil-structure interaction analyses of the pipeline, which indicated that the pipe leakage was caused by differential movement of the pipe and thrust block
• Designed external and internal emergency repairs, including immediate installation of circumferential post-tensioning tendons to strengthen the pipe and prevent pipe rupture under pressure along with installation of a continuous inner seal system to stop the leak
• Designed a permanent repair with a specially designed closure piece that would allow pipe movement relative to the wall