BP Midstream Partners LP是由BP Pipelines (North America) Inc成立的業主有限責任合夥企業。該公司擁有、運營、開發和收購管道和其他中游資產。其合伙的資產包括擁有原油、天然氣、成品油和稀釋劑管道以及成品油終端的企業的權益。該公司的合夥資產包括擁有BP2原油管道系統的BP Two Pipeline Company LLC;BP River Rouge Pipeline Company LLC擁有Whiting 至River Rouge成品油管道系統,以及擁有Diamondback稀釋劑管道系統的BP D-B Pipeline Company LLC。該公司還持有各種所有權權益,其中包括Mars Oil Pipeline Company, LLC;Mardi Gras Transportation System Company, LLC;Caesar Oil Pipeline Company, LLC;Cleopatra Gas Gathering Company, LLC;Proteus Oil Pipeline Company, LLC;Endymion Oil Pipeline Company, LLC;Ursa Oil Pipeline Company, LLC和KM Phoenix Holdings, LLC。