Ballard Marine Construction Mid-West Division provided stabilization services for a 4 mile long, 20” diameter crude oil pipeline crossing at the Straits of Mackinaw. In addition to the physical repair operations on the pipeline to be completed as phase 2, two survey operations were required.
Ultra Short BaseLine (USBL) survey utilizing a Remote Operated Vehicle (ROV) fitted with high resolution sonar which was tied to an RTK surface positioning network. This highly accurate survey was needed to determine exact span lengths of the pipeline as it traveled the bottom. To complete the survey, an Autonomous Underwater Vehicle (AUV) was utilized for additional long range survey work that included both multi-beam and side scan sonar.
All surveys were completed in water depth ranges from 5’ to 250’ depth. Operations were conducted off barge and tug platforms.