Boardwalk Pipeline Partners, LP is a limited partnership company. The Company conducts business through its primary subsidiary, Boardwalk Pipelines, LP, and its subsidiaries, Gulf South Pipeline Company, LP, Texas Gas Transmission, LLC, Gulf Crossing Pipeline Company LLC, Boardwalk Louisiana Midstream, LLC, Boardwalk Petrochemical Pipeline, LLC and Boardwalk Field Services, LLC. Its business includes integrated natural gas and natural gas liquids (NGLs), and other hydrocarbons pipeline and storage systems and natural gas gathering and processing. It is engaged in the operation of interstate natural gas and NGLs pipeline systems, including integrated storage facilities. Its segment includes interstate natural gas pipeline systems, which originate in the Gulf Coast region, Oklahoma and Arkansas and extend north and east through the Midwestern states of Tennessee, Kentucky, Illinois, Indiana and Ohio, and NGLs pipelines and storage facilities in Louisiana and Texas.