Location: Sites in Texas, Louisiana, Mississippi, Alabama, Georgia, Pennsylvania and New Jersey
Williams Transmission Co. owns a gas pipeline system extending from Texas to Virginia. It established a multiyear program designed to allow a bidirectional flow and to increase integrity management requirements. Our team performed construction estimating, engineering design and constructability assessments for projects including reduced port mainline valve replacements, pig trap replacement and modifications, and hydrostatic testing. Our scope included all mechanical, civil and electrical design calculations and drawings, necessary permit drawings, and required land documents.
We designed 50 small projects, preparing them concurrently for construction in a six-month timeline. The condensed schedule for construction required projects to be designed and procured simultaneously to be in construction by January 2019. With the wide geographic territory, projects were designed for a range of terrains and topography as well as local permitting agencies that each required unique considerations throughout engineering and construction phases.
Williams needed to mobilize quickly to scope potential projects for the 2019 construction year. We were able to organize estimating teams to visit the project sites with owner personnel and provide construction estimates within about four weeks of project initialization. During design, we worked closely with owner staff to understand the existing conditions and piping configurations. We were able to convert many sites with 2D drawings and survey to 3D piping models for future use in the ongoing maintenance.
This critical system is the largest gas transmission system in the U.S., with more than 5 billion cubic feet per day of flow, so uninterrupted operation was required throughout the project timeline.