Boardwalk Pipeline Partners, LP is a limited partnership company. The Company owns and operates three interstate natural gas pipeline systems including integrated storage facilities. Its business is conducted by its primary subsidiary, Boardwalk Pipelines, LP (Boardwalk Pipelines) and its subsidiaries, Gulf Crossing Pipeline Company LLC (Gulf Crossing), Gulf South Pipeline Company, LP (Gulf South) and Texas Gas Transmission, LLC (Texas Gas) (together, the operating subsidiaries), which consist of integrated natural gas pipeline and storage systems. During the year ended December 31, 2011, it formed Boardwalk Midstream, LP (Midstream), and its operating subsidiary, Boardwalk Field Services, LLC (Field Services), which is engaged in the natural gas gathering and processing business. In December 2011, it acquired a 20% interest in HP Storage.