BP Midstream Partners LP is a master limited partnership formed by BP Pipelines (North America) Inc. The Company owns, operates, develops and acquires pipelines and other midstream assets. It owns one onshore crude oil pipeline system, one onshore refined products pipeline system, one onshore diluent pipeline system, interests in four offshore crude oil pipeline systems and an interest in one offshore natural gas pipeline system. Its onshore crude oil, refined products and diluent pipelines include BP2 Pipeline, River Rouge Pipeline and Diamondback Pipeline. Its offshore crude oil and natural gas pipelines include Mars System, Caesar Pipeline, Cleopatra Pipeline, Proteus Pipeline and Endymion Pipeline.