Our Projects

Project Summary

Our client operates a large interstate gas transmission system that includes a multiple-pipeline crossing of the Hudson River in New York. For operational reasons our client wanted to reconfigure the crossing including the interconnections on each bank of the river, the addition of pigging facilities, and idling one of the crossing pipelines.

Challenges and Solutions

The COVID-19 pandemic hit the U.S. right after completion of conceptual design and has caused the project construction to be delayed as a result. Project priority shifts were handled in stride to accommodate the affected design, and construction schedule alterations. Material sourcing issues due to the COVID-19 pandemic were a repeating obstacle for the design team but were handled by making modifications to the piping design and material specifications to accommodate the available materials.

The modifications on each bank of the river presented several challenges due to the steep grade, the requirements for pigability of the large diameter lines, and the complex piping arrangements required for a multi-line crossing. 3D modeling of existing and proposed facilities and grades was essential to allow for proper planning of the project and enable constructability while protecting the water quality. Existing records from several sources were compiled including legacy construction plans, in-line inspection logs, material purchase records, and old construction photos.