The Pelican Crossover Project involved the fabrication and installation of a 54” crossover pipe, which connects the Number 3 and Number 4 pipelines in the Pelican Crossover Vault, part of the San Joaquin Pipeline (SJPL) System. The project was part of an overall $209 million improvement plan implemented by the San Francisco Public Utilities Commission (SFPUC), to enhance reliability of the SJPL System, which conveys water from Hetch Hetchy Reservoir, 47.5 miles across California’s Central Valley, to an estimated 2.4 million Bay Area residents.
KSN was retained by Power Engineering Construction Company to perform a 3D Laser Scan Survey of the connection points for the Number 3 and Number 4 pipelines. A standard connection piece could not be fabricated due to the connection points being misaligned both horizontally and vertically. Therefore, accurate measurements of the existing conditions were critical to make the project successful. KSN’s Scan Team entered the Pelican Crossover Vault, set up a survey control system, and performed a 3D Laser Scan Survey of the connection points on the existing Number 3 and Number 4 pipelines. KSN processed the data and develop 3D modeling of the exiting conditions, and delivered AutoCAD files to the pipe fabricator. The fabricator used KSN’s drawings to design and build the custom 54” connection pipe, which was successfully installed by Power Engineering.