Westlake Chemical Partners LP is a limited partnership formed by Westlake Chemical Corporation (Westlake). The Company operates, acquires and develops ethylene production facilities and other assets. Its business and operations are conducted through Westlake Chemical OpCo LP (OpCo). OpCo sells ethylene to Westlake and others, as well as sells co-products of ethylene production, including propylene, crude butadiene, pyrolysis gasoline and hydrogen. As of December 31, 2016, OpCo's assets included three ethylene production facilities, which primarily convert ethane into ethylene, and a 200-mile ethylene pipeline. As of December 31, 2016, OpCo owned two ethylene production facilities at Westlake's Lake Charles, Louisiana site (Petro 1 and Petro 2, collectively Lake Charles Olefins), and one ethylene production facility at Westlake's Calvert City, Kentucky site (Calvert City Olefins), with an annual capacity of approximately 630 million pounds.